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ghost wants to merge 23 commits into from
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Add IDREFs only once when validating #27

ghost wants to merge 23 commits into from

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@ghost
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@ghost ghost commented Nov 12, 2010

Currently, mono's xml xsd based validator walks the document for IDs and IDREFs, marking IDs as found and IDREFs not found yet as missing. Multiple occurences of the same IDREF are added multiple times, though, resulting in validation errors with one ID with multiple forward references to it.

pennae and others added 23 commits November 12, 2010 17:08
@pennae
Don't add IDREFs to set of missing IDs multiple times
73b53a3
[Xml] Check if the underlying writer supports LookupPrefix and return…
ec20c3c 
… empty

instead of blowing up.
@marek-safar
Add local version of constructor info constants
82744ba
@marek-safar
Remove unused namespaces
4abf9ae
@marek-safar
Move an assembly declaration handling into a new file
850d57b
[Xml] duh, don't hide the stacktrace
7eeb58c
@kumpera
Improve tests.
85539cf 
	* gc-oom-handling.cs: Modify this test to test major
	fragmentation too.

	* gc-oom-handling2.cs: Add tests for some heavy reflection
	allocators.
@kumpera
Handle OOM under evacuation.
7b94895 
	* sgen-marksweep.c (major_copy_or_mark_object): Stop evacuating
	major objects if we fail to alloc them.
@illupus
Log profiler: allow overwriting data files and name them from date an…
1cf9768 
…d pid.

* utils.h, utils.c: added getpid() wrapper.
* decode.c: display the program pid if available.
* proflog.c: added substitutions for the output name, change the default
behaviour to not overwrite a file and allow '-' at the start of the
file name to force overwrite.
@illupus
Log profiler: use the output value as a filename when report is speci…
24d28e5 
…fied.

* proflog.c: if the output option is used together with report, the report
is saved to the named file instead of being printed to stdout.
* decode.c: zlib seems to get confused with a non-compressed strem
coming from stdin: disable it in that case...
Also deal with reading 0 bytes from a buffer.
@illupus
Log profiler: updated to the new heap walk API.
dd7e9dc 
The GC now provides also offset information for each referenced object
in the heap walk API: this info is saved in the profile data now.
Updated the data version for the file format change.
@illupus
GC: changed the heap walk API to also report the offset of referenced…
0665abb 
… objects.
@illupus
Log profiler: removed the hsmode option, use heapshot=MODE instead.
b97e156
@gonzalop
make -jX should work in libgc/ now.
07e7a7c
Add new profiler to mono-devel package
87daea1
@grendello
[asp.net] Cache + SessionInProcHandler memory usage improvements
e9d29d5 
* Cache.cs: cache removes old/least recently used items when the item count exceeds 15000. Items
  are removed until they reach the count of 10000.
* SessionInProcHandler.cs: replaced ReaderWriterLock with ReaderWriterLockSlim and added a Dispose
  method to the InProcSessionItem type which disposes the associated lock and other resources.
@vargaz
Use CloseHandle () for closing process handles if HOST_WIN32 is defin…
4abfaf6 
…ed, so it works on windows based cross compilers.
@vargaz
Fix a typo (DISABLE_SOCKET->DISABLE_SOCKETS).
37d06ae
@vargaz
Fix build breakage on platforms without execvp.
38c69cb
@vargaz
Fix the previous change.
4567b37
@vargaz
Fix the DISABLE_JIT build.
d4949fd
@madewokherd
Convert MONO_MARSHAL_CONV_LPSTR_STR to mono_string_to_utf16 on windows.
aa5245b
@vargaz
Remove the unused and incomplete CMake build scripts for now.
037e353
@atsushieno
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atsushieno commented Nov 16, 2010

The code change itself is "looking" OK, but I cannot verify the change effect without concrete examples of set of schema and instance document that shows such "validation errors with one ID with multiple forward references to it" and I wonder if this change is worth committing.

@ghost
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ghost commented Nov 16, 2010

I've added a testcase for this bug to my branch. A separate pull request for just this branch (and not this lot of merge cruft. Sorry for that.) exists ( #28 )

luliyi1024 referenced this pull request in luliyi1024/mono Mar 19, 2013
@joncham
Merge pull request Unity-Technologies#27 from Unity-Technologies/mono…
70280dc 
…-bisect

Mono bisect
@migueldeicaza migueldeicaza mentioned this pull request Jan 11, 2018
Closed
@Rombersoft Rombersoft mentioned this pull request May 8, 2018
Closed
@lucasboulouys lucasboulouys mentioned this pull request Jun 28, 2018
Closed
@benjaminknox benjaminknox mentioned this pull request Aug 31, 2018
Closed
alexanderkyte added a commit to alexanderkyte/mono that referenced this pull request Jan 11, 2019
@alexanderkyte
[runtime] Add write barrier to end of JIT info table changes
3e741b3 
The MERP stress test often catches a crash like so:

```
 * frame #0: 0x0000000103409827 mono-sgen`mono_get_hazardous_pointer(pp=0x00007fc559a1a1f8, hp=0x00000001037e9600, hazard_index=1) at hazard-pointer.c:208
    frame mono#1: 0x000000010320eb8e mono-sgen`jit_info_table_chunk_index(chunk=0x00007fc4186060a0, hp=0x00000001037e9600, addr=0x00007fff73bffb66) at jit-info.c:200
    frame mono#2: 0x000000010320d7fa mono-sgen`jit_info_table_find(table=0x00007fc4186057c0, hp=0x00000001037e9600, addr=0x00007fff73bffb66) at jit-info.c:222
    frame mono#3: 0x000000010320d5e6 mono-sgen`mono_jit_info_table_find_internal(domain=0x00007fc418512bc0, addr=0x00007fff73bffb66, try_aot=1, allow_trampolines=1) at jit-info.c:293
    frame mono#4: 0x00000001030d67af mono-sgen`sigabrt_signal_handler(_dummy=6, _info=0x00007ffeecd4ea28, context=0x00007ffeecd4ea90) at mini-posix.c:219
    frame mono#5: 0x00007fff73dbdf5a libsystem_platform.dylib`_sigtramp + 26
    frame mono#6: 0x00007fff73bffb67 libsystem_kernel.dylib`__pthread_kill + 11
    frame mono#7: 0x00007fff73dca080 libsystem_pthread.dylib`pthread_kill + 333
    frame mono#8: 0x00007fff73b5b1ae libsystem_c.dylib`abort + 127
    frame mono#9: 0x00007fff73c59822 libsystem_malloc.dylib`free + 521
    frame mono#10: 0x0000000103c7d9d4 libtest.0.dylib`monoeg_g_free(ptr=0x00007ffeecd4ec34) at gmem.c:86
    frame mono#11: 0x0000000103c7733b libtest.0.dylib`mono_test_MerpCrashMalloc at libtest.c:7710
    frame mono#12: 0x0000000103c5c288
    frame mono#13: 0x000000010385dfd1
    frame mono#14: 0x0000000102ec85c3 mono-sgen`mono_jit_runtime_invoke(method=0x00007fc418514288, obj=0x0000000000000000, params=0x00007ffeecd4f180, exc=0x00007ffeecd4ef08, error=0x00007ffeecd4f250) at mini-runtime.c:3215
    frame mono#15: 0x000000010326f39d mono-sgen`do_runtime_invoke(method=0x00007fc418514288, obj=0x0000000000000000, params=0x00007ffeecd4f180, exc=0x0000000000000000, error=0x00007ffeecd4f250) at object.c:2977
    frame mono#16: 0x0000000103267c61 mono-sgen`mono_runtime_invoke_checked(method=0x00007fc418514288, obj=0x0000000000000000, params=0x00007ffeecd4f180, error=0x00007ffeecd4f250) at object.c:3145
    frame mono#17: 0x0000000103274d58 mono-sgen`do_exec_main_checked(method=0x00007fc418514288, args=0x00000001040003e8, error=0x00007ffeecd4f250) at object.c:5042
    frame mono#18: 0x0000000103272b03 mono-sgen`mono_runtime_exec_main_checked(method=0x00007fc418514288, args=0x00000001040003e8, error=0x00007ffeecd4f250) at object.c:5138
    frame mono#19: 0x0000000103272b56 mono-sgen`mono_runtime_run_main_checked(method=0x00007fc418514288, argc=2, argv=0x00007ffeecd4f760, error=0x00007ffeecd4f250) at object.c:4599
    frame mono#20: 0x0000000102f78bff mono-sgen`mono_jit_exec_internal(domain=0x00007fc418512bc0, assembly=0x00007fc4185445f0, argc=2, argv=0x00007ffeecd4f760) at driver.c:1298
    frame mono#21: 0x0000000102f78a2d mono-sgen`mono_jit_exec(domain=0x00007fc418512bc0, assembly=0x00007fc4185445f0, argc=2, argv=0x00007ffeecd4f760) at driver.c:1257
    frame mono#22: 0x0000000102f7d60f mono-sgen`main_thread_handler(user_data=0x00007ffeecd4f6a0) at driver.c:1375
    frame mono#23: 0x0000000102f7b8dd mono-sgen`mono_main(argc=3, argv=0x00007ffeecd4f758) at driver.c:2551
    frame mono#24: 0x0000000102eb1e4e mono-sgen`mono_main_with_options(argc=3, argv=0x00007ffeecd4f758) at main.c:50
    frame mono#25: 0x0000000102eb145d mono-sgen`main(argc=3, argv=0x00007ffeecd4f758) at main.c:406
    frame mono#26: 0x00007fff73aaf015 libdyld.dylib`start + 1
    frame mono#27: 0x00007fff73aaf015 libdyld.dylib`start + 1
```

because of

```
(lldb) p table->num_chunks
(int) $24 = 6
(lldb) p table->chunks [0]->num_elements
(volatile int) $18 = 50
(lldb) p table->chunks [1]->num_elements
(volatile int) $19 = 48
(lldb) p table->chunks [2]->num_elements
(volatile int) $20 = 48
(lldb) p table->chunks [3]->num_elements
(volatile int) $21 = 32
(lldb) p table->chunks [4]->num_elements
(volatile int) $23 = 32
(lldb) p table->chunks [5]->num_elements
(volatile int) $22 = 1347440720
```
.

It reproduces very often. Adding assertions / memory fences at the end
of the add/remove functions seems to remove this crash.

Looking at the code in the add function, I can picture how a missing
fence right at the end could lead to what we were seeing.

Not 100% happy with this fix, as it's going to have a perf cost. We have
an earlier fence that might be able to be coalesced into this one, but
the logic as-is makes that look unsafe.
@lateralusX lateralusX mentioned this pull request Mar 7, 2019
Merged
@srxqds srxqds mentioned this pull request May 13, 2019
Closed
lewurm added a commit to lewurm/mono that referenced this pull request Sep 20, 2019
@lewurm
[threads] clear small_id_key TLS when unregistering a thread
3a9ed64 
Fixes
```
* thread mono#12, name = 'tid_a507', stop reason = EXC_BREAKPOINT (code=1, subcode=0x1be66144)
  * frame #0: 0x1be66144 libsystem_c.dylib`__abort + 184
    frame #1: 0x1be6608c libsystem_c.dylib`abort + 152
    frame #2: 0x003e1fa0 monotouchtest`log_callback(log_domain=0x00000000, log_level="error", message="* Assertion at ../../../../../mono/utils/hazard-pointer.c:158, condition `mono_bitset_test_fast (small_id_table, id)' not met\n", fatal=4, user_data=0x00000000) at runtime.m:1251:3
    frame mono#3: 0x003abf44 monotouchtest`monoeg_g_logv_nofree(log_domain=0x00000000, log_level=G_LOG_LEVEL_ERROR, format=<unavailable>, args=<unavailable>) at goutput.c:149:2 [opt]
    frame mono#4: 0x003abfb4 monotouchtest`monoeg_assertion_message(format=<unavailable>) at goutput.c:184:22 [opt]
    frame mono#5: 0x003904dc monotouchtest`mono_thread_small_id_free(id=<unavailable>) at hazard-pointer.c:0:2 [opt]
    frame mono#6: 0x003a0a74 monotouchtest`unregister_thread(arg=0x15c88400) at mono-threads.c:588:2 [opt]
    frame mono#7: 0x00336110 monotouchtest`mono_thread_detach_if_exiting at threads.c:1571:4 [opt]
    frame mono#8: 0x003e7a14 monotouchtest`::xamarin_release_trampoline(self=0x166452f0, sel="release") at trampolines.m:644:3
    frame mono#9: 0x001cdc40 monotouchtest`::-[__Xamarin_NSTimerActionDispatcher release](self=0x166452f0, _cmd="release") at registrar.m:83445:3
    frame mono#10: 0x1ce2ae68 Foundation`_timerRelease + 80
    frame mono#11: 0x1c31b56c CoreFoundation`CFRunLoopTimerInvalidate + 612
    frame mono#12: 0x1c31a554 CoreFoundation`__CFRunLoopTimerDeallocate + 32
    frame mono#13: 0x1c31dde4 CoreFoundation`_CFRelease + 220
    frame mono#14: 0x1c2be6e8 CoreFoundation`__CFArrayReleaseValues + 500
    frame mono#15: 0x1c2be4c4 CoreFoundation`CFArrayRemoveAllValues + 104
    frame mono#16: 0x1c31ff64 CoreFoundation`__CFSetApplyFunction_block_invoke + 24
    frame mono#17: 0x1c3b2e18 CoreFoundation`CFBasicHashApply + 116
    frame mono#18: 0x1c31ff10 CoreFoundation`CFSetApplyFunction + 160
    frame mono#19: 0x1c3152cc CoreFoundation`__CFRunLoopDeallocate + 204
    frame mono#20: 0x1c31dde4 CoreFoundation`_CFRelease + 220
    frame mono#21: 0x1c304a80 CoreFoundation`__CFTSDFinalize + 144
    frame mono#22: 0x1bfa324c libsystem_pthread.dylib`_pthread_tsd_cleanup + 644
    frame mono#23: 0x1bf9cc08 libsystem_pthread.dylib`_pthread_exit + 80
    frame mono#24: 0x1bf9af24 libsystem_pthread.dylib`pthread_exit + 36
    frame mono#25: 0x0039df84 monotouchtest`mono_threads_platform_exit(exit_code=<unavailable>) at mono-threads-posix.c:145:2 [opt]
    frame mono#26: 0x0033bb84 monotouchtest`start_wrapper(data=0x1609e1c0) at threads.c:1296:2 [opt]
    frame mono#27: 0x1bf9b914 libsystem_pthread.dylib`_pthread_body + 128
    frame mono#28: 0x1bf9b874 libsystem_pthread.dylib`_pthread_start + 44
    frame mono#29: 0x1bfa3b94 libsystem_pthread.dylib`thread_start + 4
```
lewurm added a commit to lewurm/mono that referenced this pull request Sep 20, 2019
@lewurm
[threads] clear small_id_key TLS when unregistering a thread
fafb38d 
Fixes
```
* thread mono#12, name = 'tid_a507', stop reason = EXC_BREAKPOINT (code=1, subcode=0x1be66144)
  * frame #0: 0x1be66144 libsystem_c.dylib`__abort + 184
    frame #1: 0x1be6608c libsystem_c.dylib`abort + 152
    frame #2: 0x003e1fa0 monotouchtest`log_callback(log_domain=0x00000000, log_level="error", message="* Assertion at ../../../../../mono/utils/hazard-pointer.c:158, condition `mono_bitset_test_fast (small_id_table, id)' not met\n", fatal=4, user_data=0x00000000) at runtime.m:1251:3
    frame mono#3: 0x003abf44 monotouchtest`monoeg_g_logv_nofree(log_domain=0x00000000, log_level=G_LOG_LEVEL_ERROR, format=<unavailable>, args=<unavailable>) at goutput.c:149:2 [opt]
    frame mono#4: 0x003abfb4 monotouchtest`monoeg_assertion_message(format=<unavailable>) at goutput.c:184:22 [opt]
    frame mono#5: 0x003904dc monotouchtest`mono_thread_small_id_free(id=<unavailable>) at hazard-pointer.c:0:2 [opt]
    frame mono#6: 0x003a0a74 monotouchtest`unregister_thread(arg=0x15c88400) at mono-threads.c:588:2 [opt]
    frame mono#7: 0x00336110 monotouchtest`mono_thread_detach_if_exiting at threads.c:1571:4 [opt]
    frame mono#8: 0x003e7a14 monotouchtest`::xamarin_release_trampoline(self=0x166452f0, sel="release") at trampolines.m:644:3
    frame mono#9: 0x001cdc40 monotouchtest`::-[__Xamarin_NSTimerActionDispatcher release](self=0x166452f0, _cmd="release") at registrar.m:83445:3
    frame mono#10: 0x1ce2ae68 Foundation`_timerRelease + 80
    frame mono#11: 0x1c31b56c CoreFoundation`CFRunLoopTimerInvalidate + 612
    frame mono#12: 0x1c31a554 CoreFoundation`__CFRunLoopTimerDeallocate + 32
    frame mono#13: 0x1c31dde4 CoreFoundation`_CFRelease + 220
    frame mono#14: 0x1c2be6e8 CoreFoundation`__CFArrayReleaseValues + 500
    frame mono#15: 0x1c2be4c4 CoreFoundation`CFArrayRemoveAllValues + 104
    frame mono#16: 0x1c31ff64 CoreFoundation`__CFSetApplyFunction_block_invoke + 24
    frame mono#17: 0x1c3b2e18 CoreFoundation`CFBasicHashApply + 116
    frame mono#18: 0x1c31ff10 CoreFoundation`CFSetApplyFunction + 160
    frame mono#19: 0x1c3152cc CoreFoundation`__CFRunLoopDeallocate + 204
    frame mono#20: 0x1c31dde4 CoreFoundation`_CFRelease + 220
    frame mono#21: 0x1c304a80 CoreFoundation`__CFTSDFinalize + 144
    frame mono#22: 0x1bfa324c libsystem_pthread.dylib`_pthread_tsd_cleanup + 644
    frame mono#23: 0x1bf9cc08 libsystem_pthread.dylib`_pthread_exit + 80
    frame mono#24: 0x1bf9af24 libsystem_pthread.dylib`pthread_exit + 36
    frame mono#25: 0x0039df84 monotouchtest`mono_threads_platform_exit(exit_code=<unavailable>) at mono-threads-posix.c:145:2 [opt]
    frame mono#26: 0x0033bb84 monotouchtest`start_wrapper(data=0x1609e1c0) at threads.c:1296:2 [opt]
    frame mono#27: 0x1bf9b914 libsystem_pthread.dylib`_pthread_body + 128
    frame mono#28: 0x1bf9b874 libsystem_pthread.dylib`_pthread_start + 44
    frame mono#29: 0x1bfa3b94 libsystem_pthread.dylib`thread_start + 4
```
lewurm added a commit that referenced this pull request Sep 24, 2019
@lewurm @lambdageek
[threads] clear small_id_key TLS when unregistering a thread (#16973)
749493d 
* [threads] clear small_id_key TLS when unregistering a thread

Fixes
```
* thread #12, name = 'tid_a507', stop reason = EXC_BREAKPOINT (code=1, subcode=0x1be66144)
  * frame #0: 0x1be66144 libsystem_c.dylib`__abort + 184
    frame #1: 0x1be6608c libsystem_c.dylib`abort + 152
    frame #2: 0x003e1fa0 monotouchtest`log_callback(log_domain=0x00000000, log_level="error", message="* Assertion at ../../../../../mono/utils/hazard-pointer.c:158, condition `mono_bitset_test_fast (small_id_table, id)' not met\n", fatal=4, user_data=0x00000000) at runtime.m:1251:3
    frame #3: 0x003abf44 monotouchtest`monoeg_g_logv_nofree(log_domain=0x00000000, log_level=G_LOG_LEVEL_ERROR, format=<unavailable>, args=<unavailable>) at goutput.c:149:2 [opt]
    frame #4: 0x003abfb4 monotouchtest`monoeg_assertion_message(format=<unavailable>) at goutput.c:184:22 [opt]
    frame #5: 0x003904dc monotouchtest`mono_thread_small_id_free(id=<unavailable>) at hazard-pointer.c:0:2 [opt]
    frame #6: 0x003a0a74 monotouchtest`unregister_thread(arg=0x15c88400) at mono-threads.c:588:2 [opt]
    frame #7: 0x00336110 monotouchtest`mono_thread_detach_if_exiting at threads.c:1571:4 [opt]
    frame #8: 0x003e7a14 monotouchtest`::xamarin_release_trampoline(self=0x166452f0, sel="release") at trampolines.m:644:3
    frame #9: 0x001cdc40 monotouchtest`::-[__Xamarin_NSTimerActionDispatcher release](self=0x166452f0, _cmd="release") at registrar.m:83445:3
    frame #10: 0x1ce2ae68 Foundation`_timerRelease + 80
    frame #11: 0x1c31b56c CoreFoundation`CFRunLoopTimerInvalidate + 612
    frame #12: 0x1c31a554 CoreFoundation`__CFRunLoopTimerDeallocate + 32
    frame #13: 0x1c31dde4 CoreFoundation`_CFRelease + 220
    frame #14: 0x1c2be6e8 CoreFoundation`__CFArrayReleaseValues + 500
    frame #15: 0x1c2be4c4 CoreFoundation`CFArrayRemoveAllValues + 104
    frame #16: 0x1c31ff64 CoreFoundation`__CFSetApplyFunction_block_invoke + 24
    frame #17: 0x1c3b2e18 CoreFoundation`CFBasicHashApply + 116
    frame #18: 0x1c31ff10 CoreFoundation`CFSetApplyFunction + 160
    frame #19: 0x1c3152cc CoreFoundation`__CFRunLoopDeallocate + 204
    frame #20: 0x1c31dde4 CoreFoundation`_CFRelease + 220
    frame #21: 0x1c304a80 CoreFoundation`__CFTSDFinalize + 144
    frame #22: 0x1bfa324c libsystem_pthread.dylib`_pthread_tsd_cleanup + 644
    frame #23: 0x1bf9cc08 libsystem_pthread.dylib`_pthread_exit + 80
    frame #24: 0x1bf9af24 libsystem_pthread.dylib`pthread_exit + 36
    frame #25: 0x0039df84 monotouchtest`mono_threads_platform_exit(exit_code=<unavailable>) at mono-threads-posix.c:145:2 [opt]
    frame #26: 0x0033bb84 monotouchtest`start_wrapper(data=0x1609e1c0) at threads.c:1296:2 [opt]
    frame #27: 0x1bf9b914 libsystem_pthread.dylib`_pthread_body + 128
    frame #28: 0x1bf9b874 libsystem_pthread.dylib`_pthread_start + 44
    frame #29: 0x1bfa3b94 libsystem_pthread.dylib`thread_start + 4
```

* Update mono/utils/mono-threads.c

Co-Authored-By: Aleksey Kliger (λgeek) <[email protected]>
monojenkins pushed a commit to monojenkins/mono that referenced this pull request Sep 24, 2019
@lewurm @monojenkins
[threads] clear small_id_key TLS when unregistering a thread
c2dc2b9 
Fixes
```
* thread mono#12, name = 'tid_a507', stop reason = EXC_BREAKPOINT (code=1, subcode=0x1be66144)
  * frame #0: 0x1be66144 libsystem_c.dylib`__abort + 184
    frame mono#1: 0x1be6608c libsystem_c.dylib`abort + 152
    frame mono#2: 0x003e1fa0 monotouchtest`log_callback(log_domain=0x00000000, log_level="error", message="* Assertion at ../../../../../mono/utils/hazard-pointer.c:158, condition `mono_bitset_test_fast (small_id_table, id)' not met\n", fatal=4, user_data=0x00000000) at runtime.m:1251:3
    frame mono#3: 0x003abf44 monotouchtest`monoeg_g_logv_nofree(log_domain=0x00000000, log_level=G_LOG_LEVEL_ERROR, format=<unavailable>, args=<unavailable>) at goutput.c:149:2 [opt]
    frame mono#4: 0x003abfb4 monotouchtest`monoeg_assertion_message(format=<unavailable>) at goutput.c:184:22 [opt]
    frame mono#5: 0x003904dc monotouchtest`mono_thread_small_id_free(id=<unavailable>) at hazard-pointer.c:0:2 [opt]
    frame mono#6: 0x003a0a74 monotouchtest`unregister_thread(arg=0x15c88400) at mono-threads.c:588:2 [opt]
    frame mono#7: 0x00336110 monotouchtest`mono_thread_detach_if_exiting at threads.c:1571:4 [opt]
    frame mono#8: 0x003e7a14 monotouchtest`::xamarin_release_trampoline(self=0x166452f0, sel="release") at trampolines.m:644:3
    frame mono#9: 0x001cdc40 monotouchtest`::-[__Xamarin_NSTimerActionDispatcher release](self=0x166452f0, _cmd="release") at registrar.m:83445:3
    frame mono#10: 0x1ce2ae68 Foundation`_timerRelease + 80
    frame mono#11: 0x1c31b56c CoreFoundation`CFRunLoopTimerInvalidate + 612
    frame mono#12: 0x1c31a554 CoreFoundation`__CFRunLoopTimerDeallocate + 32
    frame mono#13: 0x1c31dde4 CoreFoundation`_CFRelease + 220
    frame mono#14: 0x1c2be6e8 CoreFoundation`__CFArrayReleaseValues + 500
    frame mono#15: 0x1c2be4c4 CoreFoundation`CFArrayRemoveAllValues + 104
    frame mono#16: 0x1c31ff64 CoreFoundation`__CFSetApplyFunction_block_invoke + 24
    frame mono#17: 0x1c3b2e18 CoreFoundation`CFBasicHashApply + 116
    frame mono#18: 0x1c31ff10 CoreFoundation`CFSetApplyFunction + 160
    frame mono#19: 0x1c3152cc CoreFoundation`__CFRunLoopDeallocate + 204
    frame mono#20: 0x1c31dde4 CoreFoundation`_CFRelease + 220
    frame mono#21: 0x1c304a80 CoreFoundation`__CFTSDFinalize + 144
    frame mono#22: 0x1bfa324c libsystem_pthread.dylib`_pthread_tsd_cleanup + 644
    frame mono#23: 0x1bf9cc08 libsystem_pthread.dylib`_pthread_exit + 80
    frame mono#24: 0x1bf9af24 libsystem_pthread.dylib`pthread_exit + 36
    frame mono#25: 0x0039df84 monotouchtest`mono_threads_platform_exit(exit_code=<unavailable>) at mono-threads-posix.c:145:2 [opt]
    frame mono#26: 0x0033bb84 monotouchtest`start_wrapper(data=0x1609e1c0) at threads.c:1296:2 [opt]
    frame mono#27: 0x1bf9b914 libsystem_pthread.dylib`_pthread_body + 128
    frame mono#28: 0x1bf9b874 libsystem_pthread.dylib`_pthread_start + 44
    frame mono#29: 0x1bfa3b94 libsystem_pthread.dylib`thread_start + 4
```
monojenkins added a commit that referenced this pull request Sep 24, 2019
@monojenkins
[2019-08] [threads] clear small_id_key TLS when unregistering a thread (
af008b2 
#17015)

[2019-08] [threads] clear small_id_key TLS when unregistering a thread

Fixes
```
* thread #12, name = 'tid_a507', stop reason = EXC_BREAKPOINT (code=1, subcode=0x1be66144)
  * frame #0: 0x1be66144 libsystem_c.dylib`__abort + 184
    frame #1: 0x1be6608c libsystem_c.dylib`abort + 152
    frame #2: 0x003e1fa0 monotouchtest`log_callback(log_domain=0x00000000, log_level="error", message="* Assertion at ../../../../../mono/utils/hazard-pointer.c:158, condition `mono_bitset_test_fast (small_id_table, id)' not met\n", fatal=4, user_data=0x00000000) at runtime.m:1251:3
    frame #3: 0x003abf44 monotouchtest`monoeg_g_logv_nofree(log_domain=0x00000000, log_level=G_LOG_LEVEL_ERROR, format=<unavailable>, args=<unavailable>) at goutput.c:149:2 [opt]
    frame #4: 0x003abfb4 monotouchtest`monoeg_assertion_message(format=<unavailable>) at goutput.c:184:22 [opt]
    frame #5: 0x003904dc monotouchtest`mono_thread_small_id_free(id=<unavailable>) at hazard-pointer.c:0:2 [opt]
    frame #6: 0x003a0a74 monotouchtest`unregister_thread(arg=0x15c88400) at mono-threads.c:588:2 [opt]
    frame #7: 0x00336110 monotouchtest`mono_thread_detach_if_exiting at threads.c:1571:4 [opt]
    frame #8: 0x003e7a14 monotouchtest`::xamarin_release_trampoline(self=0x166452f0, sel="release") at trampolines.m:644:3
    frame #9: 0x001cdc40 monotouchtest`::-[__Xamarin_NSTimerActionDispatcher release](self=0x166452f0, _cmd="release") at registrar.m:83445:3
    frame #10: 0x1ce2ae68 Foundation`_timerRelease + 80
    frame #11: 0x1c31b56c CoreFoundation`CFRunLoopTimerInvalidate + 612
    frame #12: 0x1c31a554 CoreFoundation`__CFRunLoopTimerDeallocate + 32
    frame #13: 0x1c31dde4 CoreFoundation`_CFRelease + 220
    frame #14: 0x1c2be6e8 CoreFoundation`__CFArrayReleaseValues + 500
    frame #15: 0x1c2be4c4 CoreFoundation`CFArrayRemoveAllValues + 104
    frame #16: 0x1c31ff64 CoreFoundation`__CFSetApplyFunction_block_invoke + 24
    frame #17: 0x1c3b2e18 CoreFoundation`CFBasicHashApply + 116
    frame #18: 0x1c31ff10 CoreFoundation`CFSetApplyFunction + 160
    frame #19: 0x1c3152cc CoreFoundation`__CFRunLoopDeallocate + 204
    frame #20: 0x1c31dde4 CoreFoundation`_CFRelease + 220
    frame #21: 0x1c304a80 CoreFoundation`__CFTSDFinalize + 144
    frame #22: 0x1bfa324c libsystem_pthread.dylib`_pthread_tsd_cleanup + 644
    frame #23: 0x1bf9cc08 libsystem_pthread.dylib`_pthread_exit + 80
    frame #24: 0x1bf9af24 libsystem_pthread.dylib`pthread_exit + 36
    frame #25: 0x0039df84 monotouchtest`mono_threads_platform_exit(exit_code=<unavailable>) at mono-threads-posix.c:145:2 [opt]
    frame #26: 0x0033bb84 monotouchtest`start_wrapper(data=0x1609e1c0) at threads.c:1296:2 [opt]
    frame #27: 0x1bf9b914 libsystem_pthread.dylib`_pthread_body + 128
    frame #28: 0x1bf9b874 libsystem_pthread.dylib`_pthread_start + 44
    frame #29: 0x1bfa3b94 libsystem_pthread.dylib`thread_start + 4
```


Debugged by @lambdageek. Contributes to #10641

Edit: C/p into PR description so it's in the commit message:

We think what happens is:

1. `start_wrapper` runs `unregister_thread` when the thread is exiting.  At that point the `small_id` for the thread is cleared from the hazard pointer bitset by `mono_thread_small_id_free (small_id)`

2. Some other TLS destructor runs and attaches the thread again (which runs `mono_thread_info_register_small_id` which first calls `mono_thread_info_get_small_id` which tries to get the small id from the `small_id_key` TLS key and so the new `MonoThreadInfo` has the same `small_id` as the previously destroyed `MonoThreadInfo` - but the hazard pointer bitset is **not** updated).

3. This other TLS destructor runs and calls `mono_thread_detach_if_exiting` which calls `unregister_thread` again.

4. `unregister_thread` calls `	mono_thread_small_id_free (small_id)` a second time which asserts because we already cleared that id from the hazard pointer bitset.



Backport of #16973.

/cc @lewurm
@fanyang-mono fanyang-mono mentioned this pull request Dec 9, 2019
Closed
lewurm added a commit to lewurm/mono that referenced this pull request Dec 9, 2019
@lewurm
[debugger] skip suspend for unattached threads
a6d8b0e 
When the debugger tries to suspend all the VM threads, it can happen with cooperative-suspend that it tries to suspend a thread that has previously been attached, but then did a "light" detach (that only unsets the domain). With the domain set to `NULL`, looking up a JitInfo for a given `ip` will result into a crash, but it isn't even necessarily needed for the purpose of suspending a thread.

More details: Consider the following:
```
(lldb) c
error: Process is running.  Use 'process interrupt' to pause execution.
Process 12832 stopped
* thread mono#9, name = 'tid_a31f', queue = 'NSOperationQueue 0x8069b670 (QOS: UTILITY)', stop reason = breakpoint 1.1
    frame #0: 0x00222870 WatchWCSessionAppWatchOSExtension`debugger_interrupt_critical(info=0x81365400, user_data=0xb04dc718) at debugger-agent.c:2716:6
   2713         MonoDomain *domain = (MonoDomain *) mono_thread_info_get_suspend_state (info)->unwind_data [MONO_UNWIND_DATA_DOMAIN];
   2714         if (!domain) {
   2715                 /* not attached */
-> 2716                 ji = NULL;
   2717         } else {
   2718                 ji = mono_jit_info_table_find_internal ( domain, MONO_CONTEXT_GET_IP (&mono_thread_info_get_suspend_state (info)->ctx), TRUE, TRUE);
   2719         }
Target 0: (WatchWCSessionAppWatchOSExtension) stopped.
(lldb) bt
* thread mono#9, name = 'tid_a31f', queue = 'NSOperationQueue 0x8069b670 (QOS: UTILITY)', stop reason = breakpoint 1.1
  * frame #0: 0x00222870 WatchWCSessionAppWatchOSExtension`debugger_interrupt_critical(info=0x81365400, user_data=0xb04dc718) at debugger-agent.c:2716:6
    frame #1: 0x004e177b WatchWCSessionAppWatchOSExtension`mono_thread_info_safe_suspend_and_run(id=0xb0767000, interrupt_kernel=0, callback=(WatchWCSessionAppWatchOSExtension`debugger_interrupt_critical at debugger-agent.c:2708), user_data=0xb04dc718) at mono-threads.c:1358:19
    frame #2: 0x00222799 WatchWCSessionAppWatchOSExtension`notify_thread(key=0x03994508, value=0x81378c00, user_data=0x00000000) at debugger-agent.c:2747:2
    frame mono#3: 0x00355bd8 WatchWCSessionAppWatchOSExtension`mono_g_hash_table_foreach(hash=0x8007b4e0, func=(WatchWCSessionAppWatchOSExtension`notify_thread at debugger-agent.c:2733), user_data=0x00000000) at mono-hash.c:310:4
    frame mono#4: 0x0021e955 WatchWCSessionAppWatchOSExtension`suspend_vm at debugger-agent.c:2844:3
    frame mono#5: 0x00225ff0 WatchWCSessionAppWatchOSExtension`process_event(event=EVENT_KIND_THREAD_START, arg=0x039945d0, il_offset=0, ctx=0x00000000, events=0x805b28e0, suspend_policy=2) at debugger-agent.c:4012:3
    frame mono#6: 0x00227c7c WatchWCSessionAppWatchOSExtension`process_profiler_event(event=EVENT_KIND_THREAD_START, arg=0x039945d0) at debugger-agent.c:4072:2
    frame mono#7: 0x0021b174 WatchWCSessionAppWatchOSExtension`thread_startup(prof=0x00000000, tid=2957889536) at debugger-agent.c:4149:2
    frame mono#8: 0x0037912d WatchWCSessionAppWatchOSExtension`mono_profiler_raise_thread_started(tid=2957889536) at profiler-events.h:103:1
    frame mono#9: 0x003d53da WatchWCSessionAppWatchOSExtension`fire_attach_profiler_events(tid=0xb04dd000) at threads.c:1120:2
    frame mono#10: 0x003d4d83 WatchWCSessionAppWatchOSExtension`mono_thread_attach(domain=0x801750a0) at threads.c:1547:2
    frame mono#11: 0x003df1a1 WatchWCSessionAppWatchOSExtension`mono_threads_attach_coop_internal(domain=0x801750a0, cookie=0xb04dcc0c, stackdata=0xb04dcba8) at threads.c:6008:3
    frame mono#12: 0x003df287 WatchWCSessionAppWatchOSExtension`mono_threads_attach_coop(domain=0x00000000, dummy=0xb04dcc0c) at threads.c:6045:9
    frame mono#13: 0x005034b8 WatchWCSessionAppWatchOSExtension`::xamarin_switch_gchandle(self=0x80762c20, to_weak=false) at runtime.m:1805:2
    frame mono#14: 0x005065c1 WatchWCSessionAppWatchOSExtension`::xamarin_retain_trampoline(self=0x80762c20, sel="retain") at trampolines.m:693:2
    frame mono#15: 0x657ea520 libobjc.A.dylib`objc_retain + 64
    frame mono#16: 0x4b4d9caa WatchConnectivity`__66-[WCSession onqueue_handleDictionaryMessageRequest:withPairingID:]_block_invoke + 279
    frame mono#17: 0x453c7df7 Foundation`__NSBLOCKOPERATION_IS_CALLING_OUT_TO_A_BLOCK__ + 12
    frame mono#18: 0x453c7cf4 Foundation`-[NSBlockOperation main] + 88
    frame mono#19: 0x453cacee Foundation`__NSOPERATION_IS_INVOKING_MAIN__ + 27
    frame mono#20: 0x453c6ebd Foundation`-[NSOperation start] + 835
    frame mono#21: 0x453cb606 Foundation`__NSOPERATIONQUEUE_IS_STARTING_AN_OPERATION__ + 27
    frame mono#22: 0x453cb12e Foundation`__NSOQSchedule_f + 194
    frame mono#23: 0x453cb26e Foundation`____addOperations_block_invoke_4 + 20
    frame mono#24: 0x65de007b libdispatch.dylib`_dispatch_call_block_and_release + 15
    frame mono#25: 0x65de126f libdispatch.dylib`_dispatch_client_callout + 14
    frame mono#26: 0x65de3788 libdispatch.dylib`_dispatch_continuation_pop + 421
    frame mono#27: 0x65de2ee3 libdispatch.dylib`_dispatch_async_redirect_invoke + 818
    frame mono#28: 0x65df087d libdispatch.dylib`_dispatch_root_queue_drain + 354
    frame mono#29: 0x65df0ff3 libdispatch.dylib`_dispatch_worker_thread2 + 109
    frame mono#30: 0x66024fa0 libsystem_pthread.dylib`_pthread_wqthread + 208
    frame mono#31: 0x66024e44 libsystem_pthread.dylib`start_wqthread + 36
```

Going further, `info` is about this thread:
```
(lldb) p/x *(int *)(((char *) info->node.key) + 0xa0)
(int) $2 = 0x01243f93
(lldb) thread list
Process 12832 stopped
  thread #1: tid = 0x1243ee1, 0x65f7e396 libsystem_kernel.dylib`mach_msg_trap + 10, name = 'tid_303', queue = 'com.apple.main-thread'
  thread #2: tid = 0x1243ee6, 0x65f816e2 libsystem_kernel.dylib`__recvfrom + 10
  thread mono#3: tid = 0x1243ee7, 0x65f81aea libsystem_kernel.dylib`__psynch_cvwait + 10, name = 'SGen worker'
  thread mono#4: tid = 0x1243ee9, 0x65f7e3d2 libsystem_kernel.dylib`semaphore_wait_trap + 10, name = 'Finalizer'
  thread mono#5: tid = 0x1243eea, 0x65f816e2 libsystem_kernel.dylib`__recvfrom + 10, name = 'Debugger agent'
  thread mono#6: tid = 0x1243f1d, 0x65f7e396 libsystem_kernel.dylib`mach_msg_trap + 10, name = 'com.apple.uikit.eventfetch-thread'
  thread mono#8: tid = 0x1243f93, 0x65f7e396 libsystem_kernel.dylib`mach_msg_trap + 10, name = 'tid_6d0f', queue = 'NSOperationQueue 0x8069b300 (QOS: UTILITY)'
* thread mono#9: tid = 0x12443a9, 0x00222870 WatchWCSessionAppWatchOSExtension`debugger_interrupt_critical(info=0x81365400, user_data=0xb04dc718) at debugger-agent.c:2716:6, name = 'tid_a31f', queue = 'NSOperationQueue 0x8069b670 (QOS: UTILITY)', stop reason = breakpoint 1.1
  thread mono#10: tid = 0x1244581, 0x65f7fd32 libsystem_kernel.dylib`__workq_kernreturn + 10
(lldb) thread select 8
* thread mono#8, name = 'tid_6d0f', queue = 'NSOperationQueue 0x8069b300 (QOS: UTILITY)'
    frame #0: 0x65f7e396 libsystem_kernel.dylib`mach_msg_trap + 10
libsystem_kernel.dylib`mach_msg_trap:
->  0x65f7e396 <+10>: retl
    0x65f7e397 <+11>: nop

libsystem_kernel.dylib`mach_msg_overwrite_trap:
    0x65f7e398 <+0>:  movl   $0xffffffe0, %eax         ; imm = 0xFFFFFFE0
    0x65f7e39d <+5>:  calll  0x65f85f44                ; _sysenter_trap
(lldb) bt
* thread mono#8, name = 'tid_6d0f', queue = 'NSOperationQueue 0x8069b300 (QOS: UTILITY)'
  * frame #0: 0x65f7e396 libsystem_kernel.dylib`mach_msg_trap + 10
    frame #1: 0x65f7e8ff libsystem_kernel.dylib`mach_msg + 47
    frame #2: 0x66079679 libxpc.dylib`_xpc_send_serializer + 104
    frame mono#3: 0x660794da libxpc.dylib`_xpc_pipe_simpleroutine + 80
    frame mono#4: 0x66079852 libxpc.dylib`xpc_pipe_simpleroutine + 43
    frame mono#5: 0x66043a8f libsystem_trace.dylib`___os_activity_stream_reflect_block_invoke_2 + 30
    frame mono#6: 0x65de126f libdispatch.dylib`_dispatch_client_callout + 14
    frame mono#7: 0x65de3d71 libdispatch.dylib`_dispatch_block_invoke_direct + 257
    frame mono#8: 0x65de3c62 libdispatch.dylib`dispatch_block_perform + 112
    frame mono#9: 0x6604349a libsystem_trace.dylib`_os_activity_stream_reflect + 725
    frame mono#10: 0x6604ef19 libsystem_trace.dylib`_os_log_impl_stream + 468
    frame mono#11: 0x6604e44d libsystem_trace.dylib`_os_log_impl_flatten_and_send + 6410
    frame mono#12: 0x6604cb3b libsystem_trace.dylib`_os_log + 137
    frame mono#13: 0x6604f4aa libsystem_trace.dylib`_os_log_impl + 31
    frame mono#14: 0x4b4eb4e9 WatchConnectivity`WCSerializePayloadDictionary + 393
    frame mono#15: 0x4b4d7c4d WatchConnectivity`-[WCSession onqueue_sendResponseDictionary:identifier:] + 195
    frame mono#16: 0x4b4da435 WatchConnectivity`__66-[WCSession onqueue_handleDictionaryMessageRequest:withPairingID:]_block_invoke.411 + 35
    frame mono#17: 0x453c7df7 Foundation`__NSBLOCKOPERATION_IS_CALLING_OUT_TO_A_BLOCK__ + 12
    frame mono#18: 0x453c7cf4 Foundation`-[NSBlockOperation main] + 88
    frame mono#19: 0x453cacee Foundation`__NSOPERATION_IS_INVOKING_MAIN__ + 27
    frame mono#20: 0x453c6ebd Foundation`-[NSOperation start] + 835
    frame mono#21: 0x453cb606 Foundation`__NSOPERATIONQUEUE_IS_STARTING_AN_OPERATION__ + 27
    frame mono#22: 0x453cb12e Foundation`__NSOQSchedule_f + 194
    frame mono#23: 0x453cb067 Foundation`____addOperations_block_invoke_2 + 20
    frame mono#24: 0x65dedf49 libdispatch.dylib`_dispatch_block_async_invoke2 + 77
    frame mono#25: 0x65de4461 libdispatch.dylib`_dispatch_block_async_invoke_and_release + 17
    frame mono#26: 0x65de126f libdispatch.dylib`_dispatch_client_callout + 14
    frame mono#27: 0x65de3788 libdispatch.dylib`_dispatch_continuation_pop + 421
    frame mono#28: 0x65de2ee3 libdispatch.dylib`_dispatch_async_redirect_invoke + 818
    frame mono#29: 0x65df087d libdispatch.dylib`_dispatch_root_queue_drain + 354
    frame mono#30: 0x65df0ff3 libdispatch.dylib`_dispatch_worker_thread2 + 109
    frame mono#31: 0x66024fa0 libsystem_pthread.dylib`_pthread_wqthread + 208
    frame mono#32: 0x66024e44 libsystem_pthread.dylib`start_wqthread + 36
```
which is a thread in a "light" detach state (aka. coop detach), where we only unset the domain:
https://github.com/mono/mono/blob/4cefdcb7ce2d939ee78fb45d1b4913eb3bc064fd/mono/metadata/threads.c#L6084-L6111

Fixes mono#17926
lewurm added a commit that referenced this pull request Dec 10, 2019
@lewurm
[debugger] skip suspend for unattached threads (#18105)
80b1e10 
When the debugger tries to suspend all the VM threads, it can happen with cooperative-suspend that it tries to suspend a thread that has previously been attached, but then did a "light" detach (that only unsets the domain). With the domain set to `NULL`, looking up a JitInfo for a given `ip` will result into a crash, but it isn't even necessarily needed for the purpose of suspending a thread.

More details: Consider the following:
```
(lldb) c
error: Process is running.  Use 'process interrupt' to pause execution.
Process 12832 stopped
* thread #9, name = 'tid_a31f', queue = 'NSOperationQueue 0x8069b670 (QOS: UTILITY)', stop reason = breakpoint 1.1
    frame #0: 0x00222870 WatchWCSessionAppWatchOSExtension`debugger_interrupt_critical(info=0x81365400, user_data=0xb04dc718) at debugger-agent.c:2716:6
   2713         MonoDomain *domain = (MonoDomain *) mono_thread_info_get_suspend_state (info)->unwind_data [MONO_UNWIND_DATA_DOMAIN];
   2714         if (!domain) {
   2715                 /* not attached */
-> 2716                 ji = NULL;
   2717         } else {
   2718                 ji = mono_jit_info_table_find_internal ( domain, MONO_CONTEXT_GET_IP (&mono_thread_info_get_suspend_state (info)->ctx), TRUE, TRUE);
   2719         }
Target 0: (WatchWCSessionAppWatchOSExtension) stopped.
(lldb) bt
* thread #9, name = 'tid_a31f', queue = 'NSOperationQueue 0x8069b670 (QOS: UTILITY)', stop reason = breakpoint 1.1
  * frame #0: 0x00222870 WatchWCSessionAppWatchOSExtension`debugger_interrupt_critical(info=0x81365400, user_data=0xb04dc718) at debugger-agent.c:2716:6
    frame #1: 0x004e177b WatchWCSessionAppWatchOSExtension`mono_thread_info_safe_suspend_and_run(id=0xb0767000, interrupt_kernel=0, callback=(WatchWCSessionAppWatchOSExtension`debugger_interrupt_critical at debugger-agent.c:2708), user_data=0xb04dc718) at mono-threads.c:1358:19
    frame #2: 0x00222799 WatchWCSessionAppWatchOSExtension`notify_thread(key=0x03994508, value=0x81378c00, user_data=0x00000000) at debugger-agent.c:2747:2
    frame #3: 0x00355bd8 WatchWCSessionAppWatchOSExtension`mono_g_hash_table_foreach(hash=0x8007b4e0, func=(WatchWCSessionAppWatchOSExtension`notify_thread at debugger-agent.c:2733), user_data=0x00000000) at mono-hash.c:310:4
    frame #4: 0x0021e955 WatchWCSessionAppWatchOSExtension`suspend_vm at debugger-agent.c:2844:3
    frame #5: 0x00225ff0 WatchWCSessionAppWatchOSExtension`process_event(event=EVENT_KIND_THREAD_START, arg=0x039945d0, il_offset=0, ctx=0x00000000, events=0x805b28e0, suspend_policy=2) at debugger-agent.c:4012:3
    frame #6: 0x00227c7c WatchWCSessionAppWatchOSExtension`process_profiler_event(event=EVENT_KIND_THREAD_START, arg=0x039945d0) at debugger-agent.c:4072:2
    frame #7: 0x0021b174 WatchWCSessionAppWatchOSExtension`thread_startup(prof=0x00000000, tid=2957889536) at debugger-agent.c:4149:2
    frame #8: 0x0037912d WatchWCSessionAppWatchOSExtension`mono_profiler_raise_thread_started(tid=2957889536) at profiler-events.h:103:1
    frame #9: 0x003d53da WatchWCSessionAppWatchOSExtension`fire_attach_profiler_events(tid=0xb04dd000) at threads.c:1120:2
    frame #10: 0x003d4d83 WatchWCSessionAppWatchOSExtension`mono_thread_attach(domain=0x801750a0) at threads.c:1547:2
    frame #11: 0x003df1a1 WatchWCSessionAppWatchOSExtension`mono_threads_attach_coop_internal(domain=0x801750a0, cookie=0xb04dcc0c, stackdata=0xb04dcba8) at threads.c:6008:3
    frame #12: 0x003df287 WatchWCSessionAppWatchOSExtension`mono_threads_attach_coop(domain=0x00000000, dummy=0xb04dcc0c) at threads.c:6045:9
    frame #13: 0x005034b8 WatchWCSessionAppWatchOSExtension`::xamarin_switch_gchandle(self=0x80762c20, to_weak=false) at runtime.m:1805:2
    frame #14: 0x005065c1 WatchWCSessionAppWatchOSExtension`::xamarin_retain_trampoline(self=0x80762c20, sel="retain") at trampolines.m:693:2
    frame #15: 0x657ea520 libobjc.A.dylib`objc_retain + 64
    frame #16: 0x4b4d9caa WatchConnectivity`__66-[WCSession onqueue_handleDictionaryMessageRequest:withPairingID:]_block_invoke + 279
    frame #17: 0x453c7df7 Foundation`__NSBLOCKOPERATION_IS_CALLING_OUT_TO_A_BLOCK__ + 12
    frame #18: 0x453c7cf4 Foundation`-[NSBlockOperation main] + 88
    frame #19: 0x453cacee Foundation`__NSOPERATION_IS_INVOKING_MAIN__ + 27
    frame #20: 0x453c6ebd Foundation`-[NSOperation start] + 835
    frame #21: 0x453cb606 Foundation`__NSOPERATIONQUEUE_IS_STARTING_AN_OPERATION__ + 27
    frame #22: 0x453cb12e Foundation`__NSOQSchedule_f + 194
    frame #23: 0x453cb26e Foundation`____addOperations_block_invoke_4 + 20
    frame #24: 0x65de007b libdispatch.dylib`_dispatch_call_block_and_release + 15
    frame #25: 0x65de126f libdispatch.dylib`_dispatch_client_callout + 14
    frame #26: 0x65de3788 libdispatch.dylib`_dispatch_continuation_pop + 421
    frame #27: 0x65de2ee3 libdispatch.dylib`_dispatch_async_redirect_invoke + 818
    frame #28: 0x65df087d libdispatch.dylib`_dispatch_root_queue_drain + 354
    frame #29: 0x65df0ff3 libdispatch.dylib`_dispatch_worker_thread2 + 109
    frame #30: 0x66024fa0 libsystem_pthread.dylib`_pthread_wqthread + 208
    frame #31: 0x66024e44 libsystem_pthread.dylib`start_wqthread + 36
```

Going further, `info` is about this thread:
```
(lldb) p/x *(int *)(((char *) info->node.key) + 0xa0)
(int) $2 = 0x01243f93
(lldb) thread list
Process 12832 stopped
  thread #1: tid = 0x1243ee1, 0x65f7e396 libsystem_kernel.dylib`mach_msg_trap + 10, name = 'tid_303', queue = 'com.apple.main-thread'
  thread #2: tid = 0x1243ee6, 0x65f816e2 libsystem_kernel.dylib`__recvfrom + 10
  thread #3: tid = 0x1243ee7, 0x65f81aea libsystem_kernel.dylib`__psynch_cvwait + 10, name = 'SGen worker'
  thread #4: tid = 0x1243ee9, 0x65f7e3d2 libsystem_kernel.dylib`semaphore_wait_trap + 10, name = 'Finalizer'
  thread #5: tid = 0x1243eea, 0x65f816e2 libsystem_kernel.dylib`__recvfrom + 10, name = 'Debugger agent'
  thread #6: tid = 0x1243f1d, 0x65f7e396 libsystem_kernel.dylib`mach_msg_trap + 10, name = 'com.apple.uikit.eventfetch-thread'
  thread #8: tid = 0x1243f93, 0x65f7e396 libsystem_kernel.dylib`mach_msg_trap + 10, name = 'tid_6d0f', queue = 'NSOperationQueue 0x8069b300 (QOS: UTILITY)'
* thread #9: tid = 0x12443a9, 0x00222870 WatchWCSessionAppWatchOSExtension`debugger_interrupt_critical(info=0x81365400, user_data=0xb04dc718) at debugger-agent.c:2716:6, name = 'tid_a31f', queue = 'NSOperationQueue 0x8069b670 (QOS: UTILITY)', stop reason = breakpoint 1.1
  thread #10: tid = 0x1244581, 0x65f7fd32 libsystem_kernel.dylib`__workq_kernreturn + 10
(lldb) thread select 8
* thread #8, name = 'tid_6d0f', queue = 'NSOperationQueue 0x8069b300 (QOS: UTILITY)'
    frame #0: 0x65f7e396 libsystem_kernel.dylib`mach_msg_trap + 10
libsystem_kernel.dylib`mach_msg_trap:
->  0x65f7e396 <+10>: retl
    0x65f7e397 <+11>: nop

libsystem_kernel.dylib`mach_msg_overwrite_trap:
    0x65f7e398 <+0>:  movl   $0xffffffe0, %eax         ; imm = 0xFFFFFFE0
    0x65f7e39d <+5>:  calll  0x65f85f44                ; _sysenter_trap
(lldb) bt
* thread #8, name = 'tid_6d0f', queue = 'NSOperationQueue 0x8069b300 (QOS: UTILITY)'
  * frame #0: 0x65f7e396 libsystem_kernel.dylib`mach_msg_trap + 10
    frame #1: 0x65f7e8ff libsystem_kernel.dylib`mach_msg + 47
    frame #2: 0x66079679 libxpc.dylib`_xpc_send_serializer + 104
    frame #3: 0x660794da libxpc.dylib`_xpc_pipe_simpleroutine + 80
    frame #4: 0x66079852 libxpc.dylib`xpc_pipe_simpleroutine + 43
    frame #5: 0x66043a8f libsystem_trace.dylib`___os_activity_stream_reflect_block_invoke_2 + 30
    frame #6: 0x65de126f libdispatch.dylib`_dispatch_client_callout + 14
    frame #7: 0x65de3d71 libdispatch.dylib`_dispatch_block_invoke_direct + 257
    frame #8: 0x65de3c62 libdispatch.dylib`dispatch_block_perform + 112
    frame #9: 0x6604349a libsystem_trace.dylib`_os_activity_stream_reflect + 725
    frame #10: 0x6604ef19 libsystem_trace.dylib`_os_log_impl_stream + 468
    frame #11: 0x6604e44d libsystem_trace.dylib`_os_log_impl_flatten_and_send + 6410
    frame #12: 0x6604cb3b libsystem_trace.dylib`_os_log + 137
    frame #13: 0x6604f4aa libsystem_trace.dylib`_os_log_impl + 31
    frame #14: 0x4b4eb4e9 WatchConnectivity`WCSerializePayloadDictionary + 393
    frame #15: 0x4b4d7c4d WatchConnectivity`-[WCSession onqueue_sendResponseDictionary:identifier:] + 195
    frame #16: 0x4b4da435 WatchConnectivity`__66-[WCSession onqueue_handleDictionaryMessageRequest:withPairingID:]_block_invoke.411 + 35
    frame #17: 0x453c7df7 Foundation`__NSBLOCKOPERATION_IS_CALLING_OUT_TO_A_BLOCK__ + 12
    frame #18: 0x453c7cf4 Foundation`-[NSBlockOperation main] + 88
    frame #19: 0x453cacee Foundation`__NSOPERATION_IS_INVOKING_MAIN__ + 27
    frame #20: 0x453c6ebd Foundation`-[NSOperation start] + 835
    frame #21: 0x453cb606 Foundation`__NSOPERATIONQUEUE_IS_STARTING_AN_OPERATION__ + 27
    frame #22: 0x453cb12e Foundation`__NSOQSchedule_f + 194
    frame #23: 0x453cb067 Foundation`____addOperations_block_invoke_2 + 20
    frame #24: 0x65dedf49 libdispatch.dylib`_dispatch_block_async_invoke2 + 77
    frame #25: 0x65de4461 libdispatch.dylib`_dispatch_block_async_invoke_and_release + 17
    frame #26: 0x65de126f libdispatch.dylib`_dispatch_client_callout + 14
    frame #27: 0x65de3788 libdispatch.dylib`_dispatch_continuation_pop + 421
    frame #28: 0x65de2ee3 libdispatch.dylib`_dispatch_async_redirect_invoke + 818
    frame #29: 0x65df087d libdispatch.dylib`_dispatch_root_queue_drain + 354
    frame #30: 0x65df0ff3 libdispatch.dylib`_dispatch_worker_thread2 + 109
    frame #31: 0x66024fa0 libsystem_pthread.dylib`_pthread_wqthread + 208
    frame #32: 0x66024e44 libsystem_pthread.dylib`start_wqthread + 36
```
which is a thread in a "light" detach state (aka. coop detach), where we only unset the domain:
https://github.com/mono/mono/blob/4cefdcb7ce2d939ee78fb45d1b4913eb3bc064fd/mono/metadata/threads.c#L6084-L6111

Fixes #17926
monojenkins pushed a commit to monojenkins/mono that referenced this pull request Dec 10, 2019
@lewurm @monojenkins
[debugger] skip suspend for unattached threads
4aff15e 
When the debugger tries to suspend all the VM threads, it can happen with cooperative-suspend that it tries to suspend a thread that has previously been attached, but then did a "light" detach (that only unsets the domain). With the domain set to `NULL`, looking up a JitInfo for a given `ip` will result into a crash, but it isn't even necessarily needed for the purpose of suspending a thread.

More details: Consider the following:
```
(lldb) c
error: Process is running.  Use 'process interrupt' to pause execution.
Process 12832 stopped
* thread mono#9, name = 'tid_a31f', queue = 'NSOperationQueue 0x8069b670 (QOS: UTILITY)', stop reason = breakpoint 1.1
    frame #0: 0x00222870 WatchWCSessionAppWatchOSExtension`debugger_interrupt_critical(info=0x81365400, user_data=0xb04dc718) at debugger-agent.c:2716:6
   2713         MonoDomain *domain = (MonoDomain *) mono_thread_info_get_suspend_state (info)->unwind_data [MONO_UNWIND_DATA_DOMAIN];
   2714         if (!domain) {
   2715                 /* not attached */
-> 2716                 ji = NULL;
   2717         } else {
   2718                 ji = mono_jit_info_table_find_internal ( domain, MONO_CONTEXT_GET_IP (&mono_thread_info_get_suspend_state (info)->ctx), TRUE, TRUE);
   2719         }
Target 0: (WatchWCSessionAppWatchOSExtension) stopped.
(lldb) bt
* thread mono#9, name = 'tid_a31f', queue = 'NSOperationQueue 0x8069b670 (QOS: UTILITY)', stop reason = breakpoint 1.1
  * frame #0: 0x00222870 WatchWCSessionAppWatchOSExtension`debugger_interrupt_critical(info=0x81365400, user_data=0xb04dc718) at debugger-agent.c:2716:6
    frame mono#1: 0x004e177b WatchWCSessionAppWatchOSExtension`mono_thread_info_safe_suspend_and_run(id=0xb0767000, interrupt_kernel=0, callback=(WatchWCSessionAppWatchOSExtension`debugger_interrupt_critical at debugger-agent.c:2708), user_data=0xb04dc718) at mono-threads.c:1358:19
    frame mono#2: 0x00222799 WatchWCSessionAppWatchOSExtension`notify_thread(key=0x03994508, value=0x81378c00, user_data=0x00000000) at debugger-agent.c:2747:2
    frame mono#3: 0x00355bd8 WatchWCSessionAppWatchOSExtension`mono_g_hash_table_foreach(hash=0x8007b4e0, func=(WatchWCSessionAppWatchOSExtension`notify_thread at debugger-agent.c:2733), user_data=0x00000000) at mono-hash.c:310:4
    frame mono#4: 0x0021e955 WatchWCSessionAppWatchOSExtension`suspend_vm at debugger-agent.c:2844:3
    frame mono#5: 0x00225ff0 WatchWCSessionAppWatchOSExtension`process_event(event=EVENT_KIND_THREAD_START, arg=0x039945d0, il_offset=0, ctx=0x00000000, events=0x805b28e0, suspend_policy=2) at debugger-agent.c:4012:3
    frame mono#6: 0x00227c7c WatchWCSessionAppWatchOSExtension`process_profiler_event(event=EVENT_KIND_THREAD_START, arg=0x039945d0) at debugger-agent.c:4072:2
    frame mono#7: 0x0021b174 WatchWCSessionAppWatchOSExtension`thread_startup(prof=0x00000000, tid=2957889536) at debugger-agent.c:4149:2
    frame mono#8: 0x0037912d WatchWCSessionAppWatchOSExtension`mono_profiler_raise_thread_started(tid=2957889536) at profiler-events.h:103:1
    frame mono#9: 0x003d53da WatchWCSessionAppWatchOSExtension`fire_attach_profiler_events(tid=0xb04dd000) at threads.c:1120:2
    frame mono#10: 0x003d4d83 WatchWCSessionAppWatchOSExtension`mono_thread_attach(domain=0x801750a0) at threads.c:1547:2
    frame mono#11: 0x003df1a1 WatchWCSessionAppWatchOSExtension`mono_threads_attach_coop_internal(domain=0x801750a0, cookie=0xb04dcc0c, stackdata=0xb04dcba8) at threads.c:6008:3
    frame mono#12: 0x003df287 WatchWCSessionAppWatchOSExtension`mono_threads_attach_coop(domain=0x00000000, dummy=0xb04dcc0c) at threads.c:6045:9
    frame mono#13: 0x005034b8 WatchWCSessionAppWatchOSExtension`::xamarin_switch_gchandle(self=0x80762c20, to_weak=false) at runtime.m:1805:2
    frame mono#14: 0x005065c1 WatchWCSessionAppWatchOSExtension`::xamarin_retain_trampoline(self=0x80762c20, sel="retain") at trampolines.m:693:2
    frame mono#15: 0x657ea520 libobjc.A.dylib`objc_retain + 64
    frame mono#16: 0x4b4d9caa WatchConnectivity`__66-[WCSession onqueue_handleDictionaryMessageRequest:withPairingID:]_block_invoke + 279
    frame mono#17: 0x453c7df7 Foundation`__NSBLOCKOPERATION_IS_CALLING_OUT_TO_A_BLOCK__ + 12
    frame mono#18: 0x453c7cf4 Foundation`-[NSBlockOperation main] + 88
    frame mono#19: 0x453cacee Foundation`__NSOPERATION_IS_INVOKING_MAIN__ + 27
    frame mono#20: 0x453c6ebd Foundation`-[NSOperation start] + 835
    frame mono#21: 0x453cb606 Foundation`__NSOPERATIONQUEUE_IS_STARTING_AN_OPERATION__ + 27
    frame mono#22: 0x453cb12e Foundation`__NSOQSchedule_f + 194
    frame mono#23: 0x453cb26e Foundation`____addOperations_block_invoke_4 + 20
    frame mono#24: 0x65de007b libdispatch.dylib`_dispatch_call_block_and_release + 15
    frame mono#25: 0x65de126f libdispatch.dylib`_dispatch_client_callout + 14
    frame mono#26: 0x65de3788 libdispatch.dylib`_dispatch_continuation_pop + 421
    frame mono#27: 0x65de2ee3 libdispatch.dylib`_dispatch_async_redirect_invoke + 818
    frame mono#28: 0x65df087d libdispatch.dylib`_dispatch_root_queue_drain + 354
    frame mono#29: 0x65df0ff3 libdispatch.dylib`_dispatch_worker_thread2 + 109
    frame mono#30: 0x66024fa0 libsystem_pthread.dylib`_pthread_wqthread + 208
    frame mono#31: 0x66024e44 libsystem_pthread.dylib`start_wqthread + 36
```

Going further, `info` is about this thread:
```
(lldb) p/x *(int *)(((char *) info->node.key) + 0xa0)
(int) $2 = 0x01243f93
(lldb) thread list
Process 12832 stopped
  thread mono#1: tid = 0x1243ee1, 0x65f7e396 libsystem_kernel.dylib`mach_msg_trap + 10, name = 'tid_303', queue = 'com.apple.main-thread'
  thread mono#2: tid = 0x1243ee6, 0x65f816e2 libsystem_kernel.dylib`__recvfrom + 10
  thread mono#3: tid = 0x1243ee7, 0x65f81aea libsystem_kernel.dylib`__psynch_cvwait + 10, name = 'SGen worker'
  thread mono#4: tid = 0x1243ee9, 0x65f7e3d2 libsystem_kernel.dylib`semaphore_wait_trap + 10, name = 'Finalizer'
  thread mono#5: tid = 0x1243eea, 0x65f816e2 libsystem_kernel.dylib`__recvfrom + 10, name = 'Debugger agent'
  thread mono#6: tid = 0x1243f1d, 0x65f7e396 libsystem_kernel.dylib`mach_msg_trap + 10, name = 'com.apple.uikit.eventfetch-thread'
  thread mono#8: tid = 0x1243f93, 0x65f7e396 libsystem_kernel.dylib`mach_msg_trap + 10, name = 'tid_6d0f', queue = 'NSOperationQueue 0x8069b300 (QOS: UTILITY)'
* thread mono#9: tid = 0x12443a9, 0x00222870 WatchWCSessionAppWatchOSExtension`debugger_interrupt_critical(info=0x81365400, user_data=0xb04dc718) at debugger-agent.c:2716:6, name = 'tid_a31f', queue = 'NSOperationQueue 0x8069b670 (QOS: UTILITY)', stop reason = breakpoint 1.1
  thread mono#10: tid = 0x1244581, 0x65f7fd32 libsystem_kernel.dylib`__workq_kernreturn + 10
(lldb) thread select 8
* thread mono#8, name = 'tid_6d0f', queue = 'NSOperationQueue 0x8069b300 (QOS: UTILITY)'
    frame #0: 0x65f7e396 libsystem_kernel.dylib`mach_msg_trap + 10
libsystem_kernel.dylib`mach_msg_trap:
->  0x65f7e396 <+10>: retl
    0x65f7e397 <+11>: nop

libsystem_kernel.dylib`mach_msg_overwrite_trap:
    0x65f7e398 <+0>:  movl   $0xffffffe0, %eax         ; imm = 0xFFFFFFE0
    0x65f7e39d <+5>:  calll  0x65f85f44                ; _sysenter_trap
(lldb) bt
* thread mono#8, name = 'tid_6d0f', queue = 'NSOperationQueue 0x8069b300 (QOS: UTILITY)'
  * frame #0: 0x65f7e396 libsystem_kernel.dylib`mach_msg_trap + 10
    frame mono#1: 0x65f7e8ff libsystem_kernel.dylib`mach_msg + 47
    frame mono#2: 0x66079679 libxpc.dylib`_xpc_send_serializer + 104
    frame mono#3: 0x660794da libxpc.dylib`_xpc_pipe_simpleroutine + 80
    frame mono#4: 0x66079852 libxpc.dylib`xpc_pipe_simpleroutine + 43
    frame mono#5: 0x66043a8f libsystem_trace.dylib`___os_activity_stream_reflect_block_invoke_2 + 30
    frame mono#6: 0x65de126f libdispatch.dylib`_dispatch_client_callout + 14
    frame mono#7: 0x65de3d71 libdispatch.dylib`_dispatch_block_invoke_direct + 257
    frame mono#8: 0x65de3c62 libdispatch.dylib`dispatch_block_perform + 112
    frame mono#9: 0x6604349a libsystem_trace.dylib`_os_activity_stream_reflect + 725
    frame mono#10: 0x6604ef19 libsystem_trace.dylib`_os_log_impl_stream + 468
    frame mono#11: 0x6604e44d libsystem_trace.dylib`_os_log_impl_flatten_and_send + 6410
    frame mono#12: 0x6604cb3b libsystem_trace.dylib`_os_log + 137
    frame mono#13: 0x6604f4aa libsystem_trace.dylib`_os_log_impl + 31
    frame mono#14: 0x4b4eb4e9 WatchConnectivity`WCSerializePayloadDictionary + 393
    frame mono#15: 0x4b4d7c4d WatchConnectivity`-[WCSession onqueue_sendResponseDictionary:identifier:] + 195
    frame mono#16: 0x4b4da435 WatchConnectivity`__66-[WCSession onqueue_handleDictionaryMessageRequest:withPairingID:]_block_invoke.411 + 35
    frame mono#17: 0x453c7df7 Foundation`__NSBLOCKOPERATION_IS_CALLING_OUT_TO_A_BLOCK__ + 12
    frame mono#18: 0x453c7cf4 Foundation`-[NSBlockOperation main] + 88
    frame mono#19: 0x453cacee Foundation`__NSOPERATION_IS_INVOKING_MAIN__ + 27
    frame mono#20: 0x453c6ebd Foundation`-[NSOperation start] + 835
    frame mono#21: 0x453cb606 Foundation`__NSOPERATIONQUEUE_IS_STARTING_AN_OPERATION__ + 27
    frame mono#22: 0x453cb12e Foundation`__NSOQSchedule_f + 194
    frame mono#23: 0x453cb067 Foundation`____addOperations_block_invoke_2 + 20
    frame mono#24: 0x65dedf49 libdispatch.dylib`_dispatch_block_async_invoke2 + 77
    frame mono#25: 0x65de4461 libdispatch.dylib`_dispatch_block_async_invoke_and_release + 17
    frame mono#26: 0x65de126f libdispatch.dylib`_dispatch_client_callout + 14
    frame mono#27: 0x65de3788 libdispatch.dylib`_dispatch_continuation_pop + 421
    frame mono#28: 0x65de2ee3 libdispatch.dylib`_dispatch_async_redirect_invoke + 818
    frame mono#29: 0x65df087d libdispatch.dylib`_dispatch_root_queue_drain + 354
    frame mono#30: 0x65df0ff3 libdispatch.dylib`_dispatch_worker_thread2 + 109
    frame mono#31: 0x66024fa0 libsystem_pthread.dylib`_pthread_wqthread + 208
    frame mono#32: 0x66024e44 libsystem_pthread.dylib`start_wqthread + 36
```
which is a thread in a "light" detach state (aka. coop detach), where we only unset the domain:
https://github.com/mono/mono/blob/4cefdcb7ce2d939ee78fb45d1b4913eb3bc064fd/mono/metadata/threads.c#L6084-L6111

Fixes mono#17926
monojenkins pushed a commit to monojenkins/mono that referenced this pull request Dec 10, 2019
@lewurm @monojenkins
[debugger] skip suspend for unattached threads
b379c7b 
When the debugger tries to suspend all the VM threads, it can happen with cooperative-suspend that it tries to suspend a thread that has previously been attached, but then did a "light" detach (that only unsets the domain). With the domain set to `NULL`, looking up a JitInfo for a given `ip` will result into a crash, but it isn't even necessarily needed for the purpose of suspending a thread.

More details: Consider the following:
```
(lldb) c
error: Process is running.  Use 'process interrupt' to pause execution.
Process 12832 stopped
* thread mono#9, name = 'tid_a31f', queue = 'NSOperationQueue 0x8069b670 (QOS: UTILITY)', stop reason = breakpoint 1.1
    frame #0: 0x00222870 WatchWCSessionAppWatchOSExtension`debugger_interrupt_critical(info=0x81365400, user_data=0xb04dc718) at debugger-agent.c:2716:6
   2713         MonoDomain *domain = (MonoDomain *) mono_thread_info_get_suspend_state (info)->unwind_data [MONO_UNWIND_DATA_DOMAIN];
   2714         if (!domain) {
   2715                 /* not attached */
-> 2716                 ji = NULL;
   2717         } else {
   2718                 ji = mono_jit_info_table_find_internal ( domain, MONO_CONTEXT_GET_IP (&mono_thread_info_get_suspend_state (info)->ctx), TRUE, TRUE);
   2719         }
Target 0: (WatchWCSessionAppWatchOSExtension) stopped.
(lldb) bt
* thread mono#9, name = 'tid_a31f', queue = 'NSOperationQueue 0x8069b670 (QOS: UTILITY)', stop reason = breakpoint 1.1
  * frame #0: 0x00222870 WatchWCSessionAppWatchOSExtension`debugger_interrupt_critical(info=0x81365400, user_data=0xb04dc718) at debugger-agent.c:2716:6
    frame mono#1: 0x004e177b WatchWCSessionAppWatchOSExtension`mono_thread_info_safe_suspend_and_run(id=0xb0767000, interrupt_kernel=0, callback=(WatchWCSessionAppWatchOSExtension`debugger_interrupt_critical at debugger-agent.c:2708), user_data=0xb04dc718) at mono-threads.c:1358:19
    frame mono#2: 0x00222799 WatchWCSessionAppWatchOSExtension`notify_thread(key=0x03994508, value=0x81378c00, user_data=0x00000000) at debugger-agent.c:2747:2
    frame mono#3: 0x00355bd8 WatchWCSessionAppWatchOSExtension`mono_g_hash_table_foreach(hash=0x8007b4e0, func=(WatchWCSessionAppWatchOSExtension`notify_thread at debugger-agent.c:2733), user_data=0x00000000) at mono-hash.c:310:4
    frame mono#4: 0x0021e955 WatchWCSessionAppWatchOSExtension`suspend_vm at debugger-agent.c:2844:3
    frame mono#5: 0x00225ff0 WatchWCSessionAppWatchOSExtension`process_event(event=EVENT_KIND_THREAD_START, arg=0x039945d0, il_offset=0, ctx=0x00000000, events=0x805b28e0, suspend_policy=2) at debugger-agent.c:4012:3
    frame mono#6: 0x00227c7c WatchWCSessionAppWatchOSExtension`process_profiler_event(event=EVENT_KIND_THREAD_START, arg=0x039945d0) at debugger-agent.c:4072:2
    frame mono#7: 0x0021b174 WatchWCSessionAppWatchOSExtension`thread_startup(prof=0x00000000, tid=2957889536) at debugger-agent.c:4149:2
    frame mono#8: 0x0037912d WatchWCSessionAppWatchOSExtension`mono_profiler_raise_thread_started(tid=2957889536) at profiler-events.h:103:1
    frame mono#9: 0x003d53da WatchWCSessionAppWatchOSExtension`fire_attach_profiler_events(tid=0xb04dd000) at threads.c:1120:2
    frame mono#10: 0x003d4d83 WatchWCSessionAppWatchOSExtension`mono_thread_attach(domain=0x801750a0) at threads.c:1547:2
    frame mono#11: 0x003df1a1 WatchWCSessionAppWatchOSExtension`mono_threads_attach_coop_internal(domain=0x801750a0, cookie=0xb04dcc0c, stackdata=0xb04dcba8) at threads.c:6008:3
    frame mono#12: 0x003df287 WatchWCSessionAppWatchOSExtension`mono_threads_attach_coop(domain=0x00000000, dummy=0xb04dcc0c) at threads.c:6045:9
    frame mono#13: 0x005034b8 WatchWCSessionAppWatchOSExtension`::xamarin_switch_gchandle(self=0x80762c20, to_weak=false) at runtime.m:1805:2
    frame mono#14: 0x005065c1 WatchWCSessionAppWatchOSExtension`::xamarin_retain_trampoline(self=0x80762c20, sel="retain") at trampolines.m:693:2
    frame mono#15: 0x657ea520 libobjc.A.dylib`objc_retain + 64
    frame mono#16: 0x4b4d9caa WatchConnectivity`__66-[WCSession onqueue_handleDictionaryMessageRequest:withPairingID:]_block_invoke + 279
    frame mono#17: 0x453c7df7 Foundation`__NSBLOCKOPERATION_IS_CALLING_OUT_TO_A_BLOCK__ + 12
    frame mono#18: 0x453c7cf4 Foundation`-[NSBlockOperation main] + 88
    frame mono#19: 0x453cacee Foundation`__NSOPERATION_IS_INVOKING_MAIN__ + 27
    frame mono#20: 0x453c6ebd Foundation`-[NSOperation start] + 835
    frame mono#21: 0x453cb606 Foundation`__NSOPERATIONQUEUE_IS_STARTING_AN_OPERATION__ + 27
    frame mono#22: 0x453cb12e Foundation`__NSOQSchedule_f + 194
    frame mono#23: 0x453cb26e Foundation`____addOperations_block_invoke_4 + 20
    frame mono#24: 0x65de007b libdispatch.dylib`_dispatch_call_block_and_release + 15
    frame mono#25: 0x65de126f libdispatch.dylib`_dispatch_client_callout + 14
    frame mono#26: 0x65de3788 libdispatch.dylib`_dispatch_continuation_pop + 421
    frame mono#27: 0x65de2ee3 libdispatch.dylib`_dispatch_async_redirect_invoke + 818
    frame mono#28: 0x65df087d libdispatch.dylib`_dispatch_root_queue_drain + 354
    frame mono#29: 0x65df0ff3 libdispatch.dylib`_dispatch_worker_thread2 + 109
    frame mono#30: 0x66024fa0 libsystem_pthread.dylib`_pthread_wqthread + 208
    frame mono#31: 0x66024e44 libsystem_pthread.dylib`start_wqthread + 36
```

Going further, `info` is about this thread:
```
(lldb) p/x *(int *)(((char *) info->node.key) + 0xa0)
(int) $2 = 0x01243f93
(lldb) thread list
Process 12832 stopped
  thread mono#1: tid = 0x1243ee1, 0x65f7e396 libsystem_kernel.dylib`mach_msg_trap + 10, name = 'tid_303', queue = 'com.apple.main-thread'
  thread mono#2: tid = 0x1243ee6, 0x65f816e2 libsystem_kernel.dylib`__recvfrom + 10
  thread mono#3: tid = 0x1243ee7, 0x65f81aea libsystem_kernel.dylib`__psynch_cvwait + 10, name = 'SGen worker'
  thread mono#4: tid = 0x1243ee9, 0x65f7e3d2 libsystem_kernel.dylib`semaphore_wait_trap + 10, name = 'Finalizer'
  thread mono#5: tid = 0x1243eea, 0x65f816e2 libsystem_kernel.dylib`__recvfrom + 10, name = 'Debugger agent'
  thread mono#6: tid = 0x1243f1d, 0x65f7e396 libsystem_kernel.dylib`mach_msg_trap + 10, name = 'com.apple.uikit.eventfetch-thread'
  thread mono#8: tid = 0x1243f93, 0x65f7e396 libsystem_kernel.dylib`mach_msg_trap + 10, name = 'tid_6d0f', queue = 'NSOperationQueue 0x8069b300 (QOS: UTILITY)'
* thread mono#9: tid = 0x12443a9, 0x00222870 WatchWCSessionAppWatchOSExtension`debugger_interrupt_critical(info=0x81365400, user_data=0xb04dc718) at debugger-agent.c:2716:6, name = 'tid_a31f', queue = 'NSOperationQueue 0x8069b670 (QOS: UTILITY)', stop reason = breakpoint 1.1
  thread mono#10: tid = 0x1244581, 0x65f7fd32 libsystem_kernel.dylib`__workq_kernreturn + 10
(lldb) thread select 8
* thread mono#8, name = 'tid_6d0f', queue = 'NSOperationQueue 0x8069b300 (QOS: UTILITY)'
    frame #0: 0x65f7e396 libsystem_kernel.dylib`mach_msg_trap + 10
libsystem_kernel.dylib`mach_msg_trap:
->  0x65f7e396 <+10>: retl
    0x65f7e397 <+11>: nop

libsystem_kernel.dylib`mach_msg_overwrite_trap:
    0x65f7e398 <+0>:  movl   $0xffffffe0, %eax         ; imm = 0xFFFFFFE0
    0x65f7e39d <+5>:  calll  0x65f85f44                ; _sysenter_trap
(lldb) bt
* thread mono#8, name = 'tid_6d0f', queue = 'NSOperationQueue 0x8069b300 (QOS: UTILITY)'
  * frame #0: 0x65f7e396 libsystem_kernel.dylib`mach_msg_trap + 10
    frame mono#1: 0x65f7e8ff libsystem_kernel.dylib`mach_msg + 47
    frame mono#2: 0x66079679 libxpc.dylib`_xpc_send_serializer + 104
    frame mono#3: 0x660794da libxpc.dylib`_xpc_pipe_simpleroutine + 80
    frame mono#4: 0x66079852 libxpc.dylib`xpc_pipe_simpleroutine + 43
    frame mono#5: 0x66043a8f libsystem_trace.dylib`___os_activity_stream_reflect_block_invoke_2 + 30
    frame mono#6: 0x65de126f libdispatch.dylib`_dispatch_client_callout + 14
    frame mono#7: 0x65de3d71 libdispatch.dylib`_dispatch_block_invoke_direct + 257
    frame mono#8: 0x65de3c62 libdispatch.dylib`dispatch_block_perform + 112
    frame mono#9: 0x6604349a libsystem_trace.dylib`_os_activity_stream_reflect + 725
    frame mono#10: 0x6604ef19 libsystem_trace.dylib`_os_log_impl_stream + 468
    frame mono#11: 0x6604e44d libsystem_trace.dylib`_os_log_impl_flatten_and_send + 6410
    frame mono#12: 0x6604cb3b libsystem_trace.dylib`_os_log + 137
    frame mono#13: 0x6604f4aa libsystem_trace.dylib`_os_log_impl + 31
    frame mono#14: 0x4b4eb4e9 WatchConnectivity`WCSerializePayloadDictionary + 393
    frame mono#15: 0x4b4d7c4d WatchConnectivity`-[WCSession onqueue_sendResponseDictionary:identifier:] + 195
    frame mono#16: 0x4b4da435 WatchConnectivity`__66-[WCSession onqueue_handleDictionaryMessageRequest:withPairingID:]_block_invoke.411 + 35
    frame mono#17: 0x453c7df7 Foundation`__NSBLOCKOPERATION_IS_CALLING_OUT_TO_A_BLOCK__ + 12
    frame mono#18: 0x453c7cf4 Foundation`-[NSBlockOperation main] + 88
    frame mono#19: 0x453cacee Foundation`__NSOPERATION_IS_INVOKING_MAIN__ + 27
    frame mono#20: 0x453c6ebd Foundation`-[NSOperation start] + 835
    frame mono#21: 0x453cb606 Foundation`__NSOPERATIONQUEUE_IS_STARTING_AN_OPERATION__ + 27
    frame mono#22: 0x453cb12e Foundation`__NSOQSchedule_f + 194
    frame mono#23: 0x453cb067 Foundation`____addOperations_block_invoke_2 + 20
    frame mono#24: 0x65dedf49 libdispatch.dylib`_dispatch_block_async_invoke2 + 77
    frame mono#25: 0x65de4461 libdispatch.dylib`_dispatch_block_async_invoke_and_release + 17
    frame mono#26: 0x65de126f libdispatch.dylib`_dispatch_client_callout + 14
    frame mono#27: 0x65de3788 libdispatch.dylib`_dispatch_continuation_pop + 421
    frame mono#28: 0x65de2ee3 libdispatch.dylib`_dispatch_async_redirect_invoke + 818
    frame mono#29: 0x65df087d libdispatch.dylib`_dispatch_root_queue_drain + 354
    frame mono#30: 0x65df0ff3 libdispatch.dylib`_dispatch_worker_thread2 + 109
    frame mono#31: 0x66024fa0 libsystem_pthread.dylib`_pthread_wqthread + 208
    frame mono#32: 0x66024e44 libsystem_pthread.dylib`start_wqthread + 36
```
which is a thread in a "light" detach state (aka. coop detach), where we only unset the domain:
https://github.com/mono/mono/blob/4cefdcb7ce2d939ee78fb45d1b4913eb3bc064fd/mono/metadata/threads.c#L6084-L6111

Fixes mono#17926
monojenkins added a commit that referenced this pull request Dec 10, 2019
@monojenkins
[debugger] skip suspend for unattached threads (#18110)
b951ebb 
[2019-12] [debugger] skip suspend for unattached threads

When the debugger tries to suspend all the VM threads, it can happen with cooperative-suspend that it tries to suspend a thread that has previously been attached, but then did a "light" detach (that only unsets the domain). With the domain set to `NULL`, looking up a JitInfo for a given `ip` will result into a crash, but it isn't even necessarily needed for the purpose of suspending a thread.

More details: Consider the following:
```
(lldb) c
error: Process is running.  Use 'process interrupt' to pause execution.
Process 12832 stopped
* thread #9, name = 'tid_a31f', queue = 'NSOperationQueue 0x8069b670 (QOS: UTILITY)', stop reason = breakpoint 1.1
    frame #0: 0x00222870 WatchWCSessionAppWatchOSExtension`debugger_interrupt_critical(info=0x81365400, user_data=0xb04dc718) at debugger-agent.c:2716:6
   2713         MonoDomain *domain = (MonoDomain *) mono_thread_info_get_suspend_state (info)->unwind_data [MONO_UNWIND_DATA_DOMAIN];
   2714         if (!domain) {
   2715                 /* not attached */
-> 2716                 ji = NULL;
   2717         } else {
   2718                 ji = mono_jit_info_table_find_internal ( domain, MONO_CONTEXT_GET_IP (&mono_thread_info_get_suspend_state (info)->ctx), TRUE, TRUE);
   2719         }
Target 0: (WatchWCSessionAppWatchOSExtension) stopped.
(lldb) bt
* thread #9, name = 'tid_a31f', queue = 'NSOperationQueue 0x8069b670 (QOS: UTILITY)', stop reason = breakpoint 1.1
  * frame #0: 0x00222870 WatchWCSessionAppWatchOSExtension`debugger_interrupt_critical(info=0x81365400, user_data=0xb04dc718) at debugger-agent.c:2716:6
    frame #1: 0x004e177b WatchWCSessionAppWatchOSExtension`mono_thread_info_safe_suspend_and_run(id=0xb0767000, interrupt_kernel=0, callback=(WatchWCSessionAppWatchOSExtension`debugger_interrupt_critical at debugger-agent.c:2708), user_data=0xb04dc718) at mono-threads.c:1358:19
    frame #2: 0x00222799 WatchWCSessionAppWatchOSExtension`notify_thread(key=0x03994508, value=0x81378c00, user_data=0x00000000) at debugger-agent.c:2747:2
    frame #3: 0x00355bd8 WatchWCSessionAppWatchOSExtension`mono_g_hash_table_foreach(hash=0x8007b4e0, func=(WatchWCSessionAppWatchOSExtension`notify_thread at debugger-agent.c:2733), user_data=0x00000000) at mono-hash.c:310:4
    frame #4: 0x0021e955 WatchWCSessionAppWatchOSExtension`suspend_vm at debugger-agent.c:2844:3
    frame #5: 0x00225ff0 WatchWCSessionAppWatchOSExtension`process_event(event=EVENT_KIND_THREAD_START, arg=0x039945d0, il_offset=0, ctx=0x00000000, events=0x805b28e0, suspend_policy=2) at debugger-agent.c:4012:3
    frame #6: 0x00227c7c WatchWCSessionAppWatchOSExtension`process_profiler_event(event=EVENT_KIND_THREAD_START, arg=0x039945d0) at debugger-agent.c:4072:2
    frame #7: 0x0021b174 WatchWCSessionAppWatchOSExtension`thread_startup(prof=0x00000000, tid=2957889536) at debugger-agent.c:4149:2
    frame #8: 0x0037912d WatchWCSessionAppWatchOSExtension`mono_profiler_raise_thread_started(tid=2957889536) at profiler-events.h:103:1
    frame #9: 0x003d53da WatchWCSessionAppWatchOSExtension`fire_attach_profiler_events(tid=0xb04dd000) at threads.c:1120:2
    frame #10: 0x003d4d83 WatchWCSessionAppWatchOSExtension`mono_thread_attach(domain=0x801750a0) at threads.c:1547:2
    frame #11: 0x003df1a1 WatchWCSessionAppWatchOSExtension`mono_threads_attach_coop_internal(domain=0x801750a0, cookie=0xb04dcc0c, stackdata=0xb04dcba8) at threads.c:6008:3
    frame #12: 0x003df287 WatchWCSessionAppWatchOSExtension`mono_threads_attach_coop(domain=0x00000000, dummy=0xb04dcc0c) at threads.c:6045:9
    frame #13: 0x005034b8 WatchWCSessionAppWatchOSExtension`::xamarin_switch_gchandle(self=0x80762c20, to_weak=false) at runtime.m:1805:2
    frame #14: 0x005065c1 WatchWCSessionAppWatchOSExtension`::xamarin_retain_trampoline(self=0x80762c20, sel="retain") at trampolines.m:693:2
    frame #15: 0x657ea520 libobjc.A.dylib`objc_retain + 64
    frame #16: 0x4b4d9caa WatchConnectivity`__66-[WCSession onqueue_handleDictionaryMessageRequest:withPairingID:]_block_invoke + 279
    frame #17: 0x453c7df7 Foundation`__NSBLOCKOPERATION_IS_CALLING_OUT_TO_A_BLOCK__ + 12
    frame #18: 0x453c7cf4 Foundation`-[NSBlockOperation main] + 88
    frame #19: 0x453cacee Foundation`__NSOPERATION_IS_INVOKING_MAIN__ + 27
    frame #20: 0x453c6ebd Foundation`-[NSOperation start] + 835
    frame #21: 0x453cb606 Foundation`__NSOPERATIONQUEUE_IS_STARTING_AN_OPERATION__ + 27
    frame #22: 0x453cb12e Foundation`__NSOQSchedule_f + 194
    frame #23: 0x453cb26e Foundation`____addOperations_block_invoke_4 + 20
    frame #24: 0x65de007b libdispatch.dylib`_dispatch_call_block_and_release + 15
    frame #25: 0x65de126f libdispatch.dylib`_dispatch_client_callout + 14
    frame #26: 0x65de3788 libdispatch.dylib`_dispatch_continuation_pop + 421
    frame #27: 0x65de2ee3 libdispatch.dylib`_dispatch_async_redirect_invoke + 818
    frame #28: 0x65df087d libdispatch.dylib`_dispatch_root_queue_drain + 354
    frame #29: 0x65df0ff3 libdispatch.dylib`_dispatch_worker_thread2 + 109
    frame #30: 0x66024fa0 libsystem_pthread.dylib`_pthread_wqthread + 208
    frame #31: 0x66024e44 libsystem_pthread.dylib`start_wqthread + 36
```

Going further, `info` is about this thread:
```
(lldb) p/x *(int *)(((char *) info->node.key) + 0xa0)
(int) $2 = 0x01243f93
(lldb) thread list
Process 12832 stopped
  thread #1: tid = 0x1243ee1, 0x65f7e396 libsystem_kernel.dylib`mach_msg_trap + 10, name = 'tid_303', queue = 'com.apple.main-thread'
  thread #2: tid = 0x1243ee6, 0x65f816e2 libsystem_kernel.dylib`__recvfrom + 10
  thread #3: tid = 0x1243ee7, 0x65f81aea libsystem_kernel.dylib`__psynch_cvwait + 10, name = 'SGen worker'
  thread #4: tid = 0x1243ee9, 0x65f7e3d2 libsystem_kernel.dylib`semaphore_wait_trap + 10, name = 'Finalizer'
  thread #5: tid = 0x1243eea, 0x65f816e2 libsystem_kernel.dylib`__recvfrom + 10, name = 'Debugger agent'
  thread #6: tid = 0x1243f1d, 0x65f7e396 libsystem_kernel.dylib`mach_msg_trap + 10, name = 'com.apple.uikit.eventfetch-thread'
  thread #8: tid = 0x1243f93, 0x65f7e396 libsystem_kernel.dylib`mach_msg_trap + 10, name = 'tid_6d0f', queue = 'NSOperationQueue 0x8069b300 (QOS: UTILITY)'
* thread #9: tid = 0x12443a9, 0x00222870 WatchWCSessionAppWatchOSExtension`debugger_interrupt_critical(info=0x81365400, user_data=0xb04dc718) at debugger-agent.c:2716:6, name = 'tid_a31f', queue = 'NSOperationQueue 0x8069b670 (QOS: UTILITY)', stop reason = breakpoint 1.1
  thread #10: tid = 0x1244581, 0x65f7fd32 libsystem_kernel.dylib`__workq_kernreturn + 10
(lldb) thread select 8
* thread #8, name = 'tid_6d0f', queue = 'NSOperationQueue 0x8069b300 (QOS: UTILITY)'
    frame #0: 0x65f7e396 libsystem_kernel.dylib`mach_msg_trap + 10
libsystem_kernel.dylib`mach_msg_trap:
->  0x65f7e396 <+10>: retl
    0x65f7e397 <+11>: nop

libsystem_kernel.dylib`mach_msg_overwrite_trap:
    0x65f7e398 <+0>:  movl   $0xffffffe0, %eax         ; imm = 0xFFFFFFE0
    0x65f7e39d <+5>:  calll  0x65f85f44                ; _sysenter_trap
(lldb) bt
* thread #8, name = 'tid_6d0f', queue = 'NSOperationQueue 0x8069b300 (QOS: UTILITY)'
  * frame #0: 0x65f7e396 libsystem_kernel.dylib`mach_msg_trap + 10
    frame #1: 0x65f7e8ff libsystem_kernel.dylib`mach_msg + 47
    frame #2: 0x66079679 libxpc.dylib`_xpc_send_serializer + 104
    frame #3: 0x660794da libxpc.dylib`_xpc_pipe_simpleroutine + 80
    frame #4: 0x66079852 libxpc.dylib`xpc_pipe_simpleroutine + 43
    frame #5: 0x66043a8f libsystem_trace.dylib`___os_activity_stream_reflect_block_invoke_2 + 30
    frame #6: 0x65de126f libdispatch.dylib`_dispatch_client_callout + 14
    frame #7: 0x65de3d71 libdispatch.dylib`_dispatch_block_invoke_direct + 257
    frame #8: 0x65de3c62 libdispatch.dylib`dispatch_block_perform + 112
    frame #9: 0x6604349a libsystem_trace.dylib`_os_activity_stream_reflect + 725
    frame #10: 0x6604ef19 libsystem_trace.dylib`_os_log_impl_stream + 468
    frame #11: 0x6604e44d libsystem_trace.dylib`_os_log_impl_flatten_and_send + 6410
    frame #12: 0x6604cb3b libsystem_trace.dylib`_os_log + 137
    frame #13: 0x6604f4aa libsystem_trace.dylib`_os_log_impl + 31
    frame #14: 0x4b4eb4e9 WatchConnectivity`WCSerializePayloadDictionary + 393
    frame #15: 0x4b4d7c4d WatchConnectivity`-[WCSession onqueue_sendResponseDictionary:identifier:] + 195
    frame #16: 0x4b4da435 WatchConnectivity`__66-[WCSession onqueue_handleDictionaryMessageRequest:withPairingID:]_block_invoke.411 + 35
    frame #17: 0x453c7df7 Foundation`__NSBLOCKOPERATION_IS_CALLING_OUT_TO_A_BLOCK__ + 12
    frame #18: 0x453c7cf4 Foundation`-[NSBlockOperation main] + 88
    frame #19: 0x453cacee Foundation`__NSOPERATION_IS_INVOKING_MAIN__ + 27
    frame #20: 0x453c6ebd Foundation`-[NSOperation start] + 835
    frame #21: 0x453cb606 Foundation`__NSOPERATIONQUEUE_IS_STARTING_AN_OPERATION__ + 27
    frame #22: 0x453cb12e Foundation`__NSOQSchedule_f + 194
    frame #23: 0x453cb067 Foundation`____addOperations_block_invoke_2 + 20
    frame #24: 0x65dedf49 libdispatch.dylib`_dispatch_block_async_invoke2 + 77
    frame #25: 0x65de4461 libdispatch.dylib`_dispatch_block_async_invoke_and_release + 17
    frame #26: 0x65de126f libdispatch.dylib`_dispatch_client_callout + 14
    frame #27: 0x65de3788 libdispatch.dylib`_dispatch_continuation_pop + 421
    frame #28: 0x65de2ee3 libdispatch.dylib`_dispatch_async_redirect_invoke + 818
    frame #29: 0x65df087d libdispatch.dylib`_dispatch_root_queue_drain + 354
    frame #30: 0x65df0ff3 libdispatch.dylib`_dispatch_worker_thread2 + 109
    frame #31: 0x66024fa0 libsystem_pthread.dylib`_pthread_wqthread + 208
    frame #32: 0x66024e44 libsystem_pthread.dylib`start_wqthread + 36
```
which is a thread in a "light" detach state (aka. coop detach), where we only unset the domain:
https://github.com/mono/mono/blob/4cefdcb7ce2d939ee78fb45d1b4913eb3bc064fd/mono/metadata/threads.c#L6084-L6111

Fixes #17926



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Backport of #18105.

/cc @lewurm
lambdageek pushed a commit that referenced this pull request Dec 10, 2019
@monojenkins @lambdageek
[debugger] skip suspend for unattached threads (#18111)
7c95e4b 
When the debugger tries to suspend all the VM threads, it can happen with cooperative-suspend that it tries to suspend a thread that has previously been attached, but then did a "light" detach (that only unsets the domain). With the domain set to `NULL`, looking up a JitInfo for a given `ip` will result into a crash, but it isn't even necessarily needed for the purpose of suspending a thread.

More details: Consider the following:
```
(lldb) c
error: Process is running.  Use 'process interrupt' to pause execution.
Process 12832 stopped
* thread #9, name = 'tid_a31f', queue = 'NSOperationQueue 0x8069b670 (QOS: UTILITY)', stop reason = breakpoint 1.1
    frame #0: 0x00222870 WatchWCSessionAppWatchOSExtension`debugger_interrupt_critical(info=0x81365400, user_data=0xb04dc718) at debugger-agent.c:2716:6
   2713         MonoDomain *domain = (MonoDomain *) mono_thread_info_get_suspend_state (info)->unwind_data [MONO_UNWIND_DATA_DOMAIN];
   2714         if (!domain) {
   2715                 /* not attached */
-> 2716                 ji = NULL;
   2717         } else {
   2718                 ji = mono_jit_info_table_find_internal ( domain, MONO_CONTEXT_GET_IP (&mono_thread_info_get_suspend_state (info)->ctx), TRUE, TRUE);
   2719         }
Target 0: (WatchWCSessionAppWatchOSExtension) stopped.
(lldb) bt
* thread #9, name = 'tid_a31f', queue = 'NSOperationQueue 0x8069b670 (QOS: UTILITY)', stop reason = breakpoint 1.1
  * frame #0: 0x00222870 WatchWCSessionAppWatchOSExtension`debugger_interrupt_critical(info=0x81365400, user_data=0xb04dc718) at debugger-agent.c:2716:6
    frame #1: 0x004e177b WatchWCSessionAppWatchOSExtension`mono_thread_info_safe_suspend_and_run(id=0xb0767000, interrupt_kernel=0, callback=(WatchWCSessionAppWatchOSExtension`debugger_interrupt_critical at debugger-agent.c:2708), user_data=0xb04dc718) at mono-threads.c:1358:19
    frame #2: 0x00222799 WatchWCSessionAppWatchOSExtension`notify_thread(key=0x03994508, value=0x81378c00, user_data=0x00000000) at debugger-agent.c:2747:2
    frame #3: 0x00355bd8 WatchWCSessionAppWatchOSExtension`mono_g_hash_table_foreach(hash=0x8007b4e0, func=(WatchWCSessionAppWatchOSExtension`notify_thread at debugger-agent.c:2733), user_data=0x00000000) at mono-hash.c:310:4
    frame #4: 0x0021e955 WatchWCSessionAppWatchOSExtension`suspend_vm at debugger-agent.c:2844:3
    frame #5: 0x00225ff0 WatchWCSessionAppWatchOSExtension`process_event(event=EVENT_KIND_THREAD_START, arg=0x039945d0, il_offset=0, ctx=0x00000000, events=0x805b28e0, suspend_policy=2) at debugger-agent.c:4012:3
    frame #6: 0x00227c7c WatchWCSessionAppWatchOSExtension`process_profiler_event(event=EVENT_KIND_THREAD_START, arg=0x039945d0) at debugger-agent.c:4072:2
    frame #7: 0x0021b174 WatchWCSessionAppWatchOSExtension`thread_startup(prof=0x00000000, tid=2957889536) at debugger-agent.c:4149:2
    frame #8: 0x0037912d WatchWCSessionAppWatchOSExtension`mono_profiler_raise_thread_started(tid=2957889536) at profiler-events.h:103:1
    frame #9: 0x003d53da WatchWCSessionAppWatchOSExtension`fire_attach_profiler_events(tid=0xb04dd000) at threads.c:1120:2
    frame #10: 0x003d4d83 WatchWCSessionAppWatchOSExtension`mono_thread_attach(domain=0x801750a0) at threads.c:1547:2
    frame #11: 0x003df1a1 WatchWCSessionAppWatchOSExtension`mono_threads_attach_coop_internal(domain=0x801750a0, cookie=0xb04dcc0c, stackdata=0xb04dcba8) at threads.c:6008:3
    frame #12: 0x003df287 WatchWCSessionAppWatchOSExtension`mono_threads_attach_coop(domain=0x00000000, dummy=0xb04dcc0c) at threads.c:6045:9
    frame #13: 0x005034b8 WatchWCSessionAppWatchOSExtension`::xamarin_switch_gchandle(self=0x80762c20, to_weak=false) at runtime.m:1805:2
    frame #14: 0x005065c1 WatchWCSessionAppWatchOSExtension`::xamarin_retain_trampoline(self=0x80762c20, sel="retain") at trampolines.m:693:2
    frame #15: 0x657ea520 libobjc.A.dylib`objc_retain + 64
    frame #16: 0x4b4d9caa WatchConnectivity`__66-[WCSession onqueue_handleDictionaryMessageRequest:withPairingID:]_block_invoke + 279
    frame #17: 0x453c7df7 Foundation`__NSBLOCKOPERATION_IS_CALLING_OUT_TO_A_BLOCK__ + 12
    frame #18: 0x453c7cf4 Foundation`-[NSBlockOperation main] + 88
    frame #19: 0x453cacee Foundation`__NSOPERATION_IS_INVOKING_MAIN__ + 27
    frame #20: 0x453c6ebd Foundation`-[NSOperation start] + 835
    frame #21: 0x453cb606 Foundation`__NSOPERATIONQUEUE_IS_STARTING_AN_OPERATION__ + 27
    frame #22: 0x453cb12e Foundation`__NSOQSchedule_f + 194
    frame #23: 0x453cb26e Foundation`____addOperations_block_invoke_4 + 20
    frame #24: 0x65de007b libdispatch.dylib`_dispatch_call_block_and_release + 15
    frame #25: 0x65de126f libdispatch.dylib`_dispatch_client_callout + 14
    frame #26: 0x65de3788 libdispatch.dylib`_dispatch_continuation_pop + 421
    frame #27: 0x65de2ee3 libdispatch.dylib`_dispatch_async_redirect_invoke + 818
    frame #28: 0x65df087d libdispatch.dylib`_dispatch_root_queue_drain + 354
    frame #29: 0x65df0ff3 libdispatch.dylib`_dispatch_worker_thread2 + 109
    frame #30: 0x66024fa0 libsystem_pthread.dylib`_pthread_wqthread + 208
    frame #31: 0x66024e44 libsystem_pthread.dylib`start_wqthread + 36
```

Going further, `info` is about this thread:
```
(lldb) p/x *(int *)(((char *) info->node.key) + 0xa0)
(int) $2 = 0x01243f93
(lldb) thread list
Process 12832 stopped
  thread #1: tid = 0x1243ee1, 0x65f7e396 libsystem_kernel.dylib`mach_msg_trap + 10, name = 'tid_303', queue = 'com.apple.main-thread'
  thread #2: tid = 0x1243ee6, 0x65f816e2 libsystem_kernel.dylib`__recvfrom + 10
  thread #3: tid = 0x1243ee7, 0x65f81aea libsystem_kernel.dylib`__psynch_cvwait + 10, name = 'SGen worker'
  thread #4: tid = 0x1243ee9, 0x65f7e3d2 libsystem_kernel.dylib`semaphore_wait_trap + 10, name = 'Finalizer'
  thread #5: tid = 0x1243eea, 0x65f816e2 libsystem_kernel.dylib`__recvfrom + 10, name = 'Debugger agent'
  thread #6: tid = 0x1243f1d, 0x65f7e396 libsystem_kernel.dylib`mach_msg_trap + 10, name = 'com.apple.uikit.eventfetch-thread'
  thread #8: tid = 0x1243f93, 0x65f7e396 libsystem_kernel.dylib`mach_msg_trap + 10, name = 'tid_6d0f', queue = 'NSOperationQueue 0x8069b300 (QOS: UTILITY)'
* thread #9: tid = 0x12443a9, 0x00222870 WatchWCSessionAppWatchOSExtension`debugger_interrupt_critical(info=0x81365400, user_data=0xb04dc718) at debugger-agent.c:2716:6, name = 'tid_a31f', queue = 'NSOperationQueue 0x8069b670 (QOS: UTILITY)', stop reason = breakpoint 1.1
  thread #10: tid = 0x1244581, 0x65f7fd32 libsystem_kernel.dylib`__workq_kernreturn + 10
(lldb) thread select 8
* thread #8, name = 'tid_6d0f', queue = 'NSOperationQueue 0x8069b300 (QOS: UTILITY)'
    frame #0: 0x65f7e396 libsystem_kernel.dylib`mach_msg_trap + 10
libsystem_kernel.dylib`mach_msg_trap:
->  0x65f7e396 <+10>: retl
    0x65f7e397 <+11>: nop

libsystem_kernel.dylib`mach_msg_overwrite_trap:
    0x65f7e398 <+0>:  movl   $0xffffffe0, %eax         ; imm = 0xFFFFFFE0
    0x65f7e39d <+5>:  calll  0x65f85f44                ; _sysenter_trap
(lldb) bt
* thread #8, name = 'tid_6d0f', queue = 'NSOperationQueue 0x8069b300 (QOS: UTILITY)'
  * frame #0: 0x65f7e396 libsystem_kernel.dylib`mach_msg_trap + 10
    frame #1: 0x65f7e8ff libsystem_kernel.dylib`mach_msg + 47
    frame #2: 0x66079679 libxpc.dylib`_xpc_send_serializer + 104
    frame #3: 0x660794da libxpc.dylib`_xpc_pipe_simpleroutine + 80
    frame #4: 0x66079852 libxpc.dylib`xpc_pipe_simpleroutine + 43
    frame #5: 0x66043a8f libsystem_trace.dylib`___os_activity_stream_reflect_block_invoke_2 + 30
    frame #6: 0x65de126f libdispatch.dylib`_dispatch_client_callout + 14
    frame #7: 0x65de3d71 libdispatch.dylib`_dispatch_block_invoke_direct + 257
    frame #8: 0x65de3c62 libdispatch.dylib`dispatch_block_perform + 112
    frame #9: 0x6604349a libsystem_trace.dylib`_os_activity_stream_reflect + 725
    frame #10: 0x6604ef19 libsystem_trace.dylib`_os_log_impl_stream + 468
    frame #11: 0x6604e44d libsystem_trace.dylib`_os_log_impl_flatten_and_send + 6410
    frame #12: 0x6604cb3b libsystem_trace.dylib`_os_log + 137
    frame #13: 0x6604f4aa libsystem_trace.dylib`_os_log_impl + 31
    frame #14: 0x4b4eb4e9 WatchConnectivity`WCSerializePayloadDictionary + 393
    frame #15: 0x4b4d7c4d WatchConnectivity`-[WCSession onqueue_sendResponseDictionary:identifier:] + 195
    frame #16: 0x4b4da435 WatchConnectivity`__66-[WCSession onqueue_handleDictionaryMessageRequest:withPairingID:]_block_invoke.411 + 35
    frame #17: 0x453c7df7 Foundation`__NSBLOCKOPERATION_IS_CALLING_OUT_TO_A_BLOCK__ + 12
    frame #18: 0x453c7cf4 Foundation`-[NSBlockOperation main] + 88
    frame #19: 0x453cacee Foundation`__NSOPERATION_IS_INVOKING_MAIN__ + 27
    frame #20: 0x453c6ebd Foundation`-[NSOperation start] + 835
    frame #21: 0x453cb606 Foundation`__NSOPERATIONQUEUE_IS_STARTING_AN_OPERATION__ + 27
    frame #22: 0x453cb12e Foundation`__NSOQSchedule_f + 194
    frame #23: 0x453cb067 Foundation`____addOperations_block_invoke_2 + 20
    frame #24: 0x65dedf49 libdispatch.dylib`_dispatch_block_async_invoke2 + 77
    frame #25: 0x65de4461 libdispatch.dylib`_dispatch_block_async_invoke_and_release + 17
    frame #26: 0x65de126f libdispatch.dylib`_dispatch_client_callout + 14
    frame #27: 0x65de3788 libdispatch.dylib`_dispatch_continuation_pop + 421
    frame #28: 0x65de2ee3 libdispatch.dylib`_dispatch_async_redirect_invoke + 818
    frame #29: 0x65df087d libdispatch.dylib`_dispatch_root_queue_drain + 354
    frame #30: 0x65df0ff3 libdispatch.dylib`_dispatch_worker_thread2 + 109
    frame #31: 0x66024fa0 libsystem_pthread.dylib`_pthread_wqthread + 208
    frame #32: 0x66024e44 libsystem_pthread.dylib`start_wqthread + 36
```
which is a thread in a "light" detach state (aka. coop detach), where we only unset the domain:
https://github.com/mono/mono/blob/4cefdcb7ce2d939ee78fb45d1b4913eb3bc064fd/mono/metadata/threads.c#L6084-L6111

Fixes #17926
monojenkins pushed a commit to monojenkins/mono that referenced this pull request Dec 11, 2019
@lewurm @monojenkins
[debugger] skip suspend for unattached threads
cf6037b 
When the debugger tries to suspend all the VM threads, it can happen with cooperative-suspend that it tries to suspend a thread that has previously been attached, but then did a "light" detach (that only unsets the domain). With the domain set to `NULL`, looking up a JitInfo for a given `ip` will result into a crash, but it isn't even necessarily needed for the purpose of suspending a thread.

More details: Consider the following:
```
(lldb) c
error: Process is running.  Use 'process interrupt' to pause execution.
Process 12832 stopped
* thread mono#9, name = 'tid_a31f', queue = 'NSOperationQueue 0x8069b670 (QOS: UTILITY)', stop reason = breakpoint 1.1
    frame #0: 0x00222870 WatchWCSessionAppWatchOSExtension`debugger_interrupt_critical(info=0x81365400, user_data=0xb04dc718) at debugger-agent.c:2716:6
   2713         MonoDomain *domain = (MonoDomain *) mono_thread_info_get_suspend_state (info)->unwind_data [MONO_UNWIND_DATA_DOMAIN];
   2714         if (!domain) {
   2715                 /* not attached */
-> 2716                 ji = NULL;
   2717         } else {
   2718                 ji = mono_jit_info_table_find_internal ( domain, MONO_CONTEXT_GET_IP (&mono_thread_info_get_suspend_state (info)->ctx), TRUE, TRUE);
   2719         }
Target 0: (WatchWCSessionAppWatchOSExtension) stopped.
(lldb) bt
* thread mono#9, name = 'tid_a31f', queue = 'NSOperationQueue 0x8069b670 (QOS: UTILITY)', stop reason = breakpoint 1.1
  * frame #0: 0x00222870 WatchWCSessionAppWatchOSExtension`debugger_interrupt_critical(info=0x81365400, user_data=0xb04dc718) at debugger-agent.c:2716:6
    frame mono#1: 0x004e177b WatchWCSessionAppWatchOSExtension`mono_thread_info_safe_suspend_and_run(id=0xb0767000, interrupt_kernel=0, callback=(WatchWCSessionAppWatchOSExtension`debugger_interrupt_critical at debugger-agent.c:2708), user_data=0xb04dc718) at mono-threads.c:1358:19
    frame mono#2: 0x00222799 WatchWCSessionAppWatchOSExtension`notify_thread(key=0x03994508, value=0x81378c00, user_data=0x00000000) at debugger-agent.c:2747:2
    frame mono#3: 0x00355bd8 WatchWCSessionAppWatchOSExtension`mono_g_hash_table_foreach(hash=0x8007b4e0, func=(WatchWCSessionAppWatchOSExtension`notify_thread at debugger-agent.c:2733), user_data=0x00000000) at mono-hash.c:310:4
    frame mono#4: 0x0021e955 WatchWCSessionAppWatchOSExtension`suspend_vm at debugger-agent.c:2844:3
    frame mono#5: 0x00225ff0 WatchWCSessionAppWatchOSExtension`process_event(event=EVENT_KIND_THREAD_START, arg=0x039945d0, il_offset=0, ctx=0x00000000, events=0x805b28e0, suspend_policy=2) at debugger-agent.c:4012:3
    frame mono#6: 0x00227c7c WatchWCSessionAppWatchOSExtension`process_profiler_event(event=EVENT_KIND_THREAD_START, arg=0x039945d0) at debugger-agent.c:4072:2
    frame mono#7: 0x0021b174 WatchWCSessionAppWatchOSExtension`thread_startup(prof=0x00000000, tid=2957889536) at debugger-agent.c:4149:2
    frame mono#8: 0x0037912d WatchWCSessionAppWatchOSExtension`mono_profiler_raise_thread_started(tid=2957889536) at profiler-events.h:103:1
    frame mono#9: 0x003d53da WatchWCSessionAppWatchOSExtension`fire_attach_profiler_events(tid=0xb04dd000) at threads.c:1120:2
    frame mono#10: 0x003d4d83 WatchWCSessionAppWatchOSExtension`mono_thread_attach(domain=0x801750a0) at threads.c:1547:2
    frame mono#11: 0x003df1a1 WatchWCSessionAppWatchOSExtension`mono_threads_attach_coop_internal(domain=0x801750a0, cookie=0xb04dcc0c, stackdata=0xb04dcba8) at threads.c:6008:3
    frame mono#12: 0x003df287 WatchWCSessionAppWatchOSExtension`mono_threads_attach_coop(domain=0x00000000, dummy=0xb04dcc0c) at threads.c:6045:9
    frame mono#13: 0x005034b8 WatchWCSessionAppWatchOSExtension`::xamarin_switch_gchandle(self=0x80762c20, to_weak=false) at runtime.m:1805:2
    frame mono#14: 0x005065c1 WatchWCSessionAppWatchOSExtension`::xamarin_retain_trampoline(self=0x80762c20, sel="retain") at trampolines.m:693:2
    frame mono#15: 0x657ea520 libobjc.A.dylib`objc_retain + 64
    frame mono#16: 0x4b4d9caa WatchConnectivity`__66-[WCSession onqueue_handleDictionaryMessageRequest:withPairingID:]_block_invoke + 279
    frame mono#17: 0x453c7df7 Foundation`__NSBLOCKOPERATION_IS_CALLING_OUT_TO_A_BLOCK__ + 12
    frame mono#18: 0x453c7cf4 Foundation`-[NSBlockOperation main] + 88
    frame mono#19: 0x453cacee Foundation`__NSOPERATION_IS_INVOKING_MAIN__ + 27
    frame mono#20: 0x453c6ebd Foundation`-[NSOperation start] + 835
    frame mono#21: 0x453cb606 Foundation`__NSOPERATIONQUEUE_IS_STARTING_AN_OPERATION__ + 27
    frame mono#22: 0x453cb12e Foundation`__NSOQSchedule_f + 194
    frame mono#23: 0x453cb26e Foundation`____addOperations_block_invoke_4 + 20
    frame mono#24: 0x65de007b libdispatch.dylib`_dispatch_call_block_and_release + 15
    frame mono#25: 0x65de126f libdispatch.dylib`_dispatch_client_callout + 14
    frame mono#26: 0x65de3788 libdispatch.dylib`_dispatch_continuation_pop + 421
    frame mono#27: 0x65de2ee3 libdispatch.dylib`_dispatch_async_redirect_invoke + 818
    frame mono#28: 0x65df087d libdispatch.dylib`_dispatch_root_queue_drain + 354
    frame mono#29: 0x65df0ff3 libdispatch.dylib`_dispatch_worker_thread2 + 109
    frame mono#30: 0x66024fa0 libsystem_pthread.dylib`_pthread_wqthread + 208
    frame mono#31: 0x66024e44 libsystem_pthread.dylib`start_wqthread + 36
```

Going further, `info` is about this thread:
```
(lldb) p/x *(int *)(((char *) info->node.key) + 0xa0)
(int) $2 = 0x01243f93
(lldb) thread list
Process 12832 stopped
  thread mono#1: tid = 0x1243ee1, 0x65f7e396 libsystem_kernel.dylib`mach_msg_trap + 10, name = 'tid_303', queue = 'com.apple.main-thread'
  thread mono#2: tid = 0x1243ee6, 0x65f816e2 libsystem_kernel.dylib`__recvfrom + 10
  thread mono#3: tid = 0x1243ee7, 0x65f81aea libsystem_kernel.dylib`__psynch_cvwait + 10, name = 'SGen worker'
  thread mono#4: tid = 0x1243ee9, 0x65f7e3d2 libsystem_kernel.dylib`semaphore_wait_trap + 10, name = 'Finalizer'
  thread mono#5: tid = 0x1243eea, 0x65f816e2 libsystem_kernel.dylib`__recvfrom + 10, name = 'Debugger agent'
  thread mono#6: tid = 0x1243f1d, 0x65f7e396 libsystem_kernel.dylib`mach_msg_trap + 10, name = 'com.apple.uikit.eventfetch-thread'
  thread mono#8: tid = 0x1243f93, 0x65f7e396 libsystem_kernel.dylib`mach_msg_trap + 10, name = 'tid_6d0f', queue = 'NSOperationQueue 0x8069b300 (QOS: UTILITY)'
* thread mono#9: tid = 0x12443a9, 0x00222870 WatchWCSessionAppWatchOSExtension`debugger_interrupt_critical(info=0x81365400, user_data=0xb04dc718) at debugger-agent.c:2716:6, name = 'tid_a31f', queue = 'NSOperationQueue 0x8069b670 (QOS: UTILITY)', stop reason = breakpoint 1.1
  thread mono#10: tid = 0x1244581, 0x65f7fd32 libsystem_kernel.dylib`__workq_kernreturn + 10
(lldb) thread select 8
* thread mono#8, name = 'tid_6d0f', queue = 'NSOperationQueue 0x8069b300 (QOS: UTILITY)'
    frame #0: 0x65f7e396 libsystem_kernel.dylib`mach_msg_trap + 10
libsystem_kernel.dylib`mach_msg_trap:
->  0x65f7e396 <+10>: retl
    0x65f7e397 <+11>: nop

libsystem_kernel.dylib`mach_msg_overwrite_trap:
    0x65f7e398 <+0>:  movl   $0xffffffe0, %eax         ; imm = 0xFFFFFFE0
    0x65f7e39d <+5>:  calll  0x65f85f44                ; _sysenter_trap
(lldb) bt
* thread mono#8, name = 'tid_6d0f', queue = 'NSOperationQueue 0x8069b300 (QOS: UTILITY)'
  * frame #0: 0x65f7e396 libsystem_kernel.dylib`mach_msg_trap + 10
    frame mono#1: 0x65f7e8ff libsystem_kernel.dylib`mach_msg + 47
    frame mono#2: 0x66079679 libxpc.dylib`_xpc_send_serializer + 104
    frame mono#3: 0x660794da libxpc.dylib`_xpc_pipe_simpleroutine + 80
    frame mono#4: 0x66079852 libxpc.dylib`xpc_pipe_simpleroutine + 43
    frame mono#5: 0x66043a8f libsystem_trace.dylib`___os_activity_stream_reflect_block_invoke_2 + 30
    frame mono#6: 0x65de126f libdispatch.dylib`_dispatch_client_callout + 14
    frame mono#7: 0x65de3d71 libdispatch.dylib`_dispatch_block_invoke_direct + 257
    frame mono#8: 0x65de3c62 libdispatch.dylib`dispatch_block_perform + 112
    frame mono#9: 0x6604349a libsystem_trace.dylib`_os_activity_stream_reflect + 725
    frame mono#10: 0x6604ef19 libsystem_trace.dylib`_os_log_impl_stream + 468
    frame mono#11: 0x6604e44d libsystem_trace.dylib`_os_log_impl_flatten_and_send + 6410
    frame mono#12: 0x6604cb3b libsystem_trace.dylib`_os_log + 137
    frame mono#13: 0x6604f4aa libsystem_trace.dylib`_os_log_impl + 31
    frame mono#14: 0x4b4eb4e9 WatchConnectivity`WCSerializePayloadDictionary + 393
    frame mono#15: 0x4b4d7c4d WatchConnectivity`-[WCSession onqueue_sendResponseDictionary:identifier:] + 195
    frame mono#16: 0x4b4da435 WatchConnectivity`__66-[WCSession onqueue_handleDictionaryMessageRequest:withPairingID:]_block_invoke.411 + 35
    frame mono#17: 0x453c7df7 Foundation`__NSBLOCKOPERATION_IS_CALLING_OUT_TO_A_BLOCK__ + 12
    frame mono#18: 0x453c7cf4 Foundation`-[NSBlockOperation main] + 88
    frame mono#19: 0x453cacee Foundation`__NSOPERATION_IS_INVOKING_MAIN__ + 27
    frame mono#20: 0x453c6ebd Foundation`-[NSOperation start] + 835
    frame mono#21: 0x453cb606 Foundation`__NSOPERATIONQUEUE_IS_STARTING_AN_OPERATION__ + 27
    frame mono#22: 0x453cb12e Foundation`__NSOQSchedule_f + 194
    frame mono#23: 0x453cb067 Foundation`____addOperations_block_invoke_2 + 20
    frame mono#24: 0x65dedf49 libdispatch.dylib`_dispatch_block_async_invoke2 + 77
    frame mono#25: 0x65de4461 libdispatch.dylib`_dispatch_block_async_invoke_and_release + 17
    frame mono#26: 0x65de126f libdispatch.dylib`_dispatch_client_callout + 14
    frame mono#27: 0x65de3788 libdispatch.dylib`_dispatch_continuation_pop + 421
    frame mono#28: 0x65de2ee3 libdispatch.dylib`_dispatch_async_redirect_invoke + 818
    frame mono#29: 0x65df087d libdispatch.dylib`_dispatch_root_queue_drain + 354
    frame mono#30: 0x65df0ff3 libdispatch.dylib`_dispatch_worker_thread2 + 109
    frame mono#31: 0x66024fa0 libsystem_pthread.dylib`_pthread_wqthread + 208
    frame mono#32: 0x66024e44 libsystem_pthread.dylib`start_wqthread + 36
```
which is a thread in a "light" detach state (aka. coop detach), where we only unset the domain:
https://github.com/mono/mono/blob/4cefdcb7ce2d939ee78fb45d1b4913eb3bc064fd/mono/metadata/threads.c#L6084-L6111

Fixes mono#17926
monojenkins added a commit that referenced this pull request Dec 12, 2019
@monojenkins
[debugger] skip suspend for unattached threads (#18138)
e3084ec 
[2019-08] [debugger] skip suspend for unattached threads

When the debugger tries to suspend all the VM threads, it can happen with cooperative-suspend that it tries to suspend a thread that has previously been attached, but then did a "light" detach (that only unsets the domain). With the domain set to `NULL`, looking up a JitInfo for a given `ip` will result into a crash, but it isn't even necessarily needed for the purpose of suspending a thread.

More details: Consider the following:
```
(lldb) c
error: Process is running.  Use 'process interrupt' to pause execution.
Process 12832 stopped
* thread #9, name = 'tid_a31f', queue = 'NSOperationQueue 0x8069b670 (QOS: UTILITY)', stop reason = breakpoint 1.1
    frame #0: 0x00222870 WatchWCSessionAppWatchOSExtension`debugger_interrupt_critical(info=0x81365400, user_data=0xb04dc718) at debugger-agent.c:2716:6
   2713         MonoDomain *domain = (MonoDomain *) mono_thread_info_get_suspend_state (info)->unwind_data [MONO_UNWIND_DATA_DOMAIN];
   2714         if (!domain) {
   2715                 /* not attached */
-> 2716                 ji = NULL;
   2717         } else {
   2718                 ji = mono_jit_info_table_find_internal ( domain, MONO_CONTEXT_GET_IP (&mono_thread_info_get_suspend_state (info)->ctx), TRUE, TRUE);
   2719         }
Target 0: (WatchWCSessionAppWatchOSExtension) stopped.
(lldb) bt
* thread #9, name = 'tid_a31f', queue = 'NSOperationQueue 0x8069b670 (QOS: UTILITY)', stop reason = breakpoint 1.1
  * frame #0: 0x00222870 WatchWCSessionAppWatchOSExtension`debugger_interrupt_critical(info=0x81365400, user_data=0xb04dc718) at debugger-agent.c:2716:6
    frame #1: 0x004e177b WatchWCSessionAppWatchOSExtension`mono_thread_info_safe_suspend_and_run(id=0xb0767000, interrupt_kernel=0, callback=(WatchWCSessionAppWatchOSExtension`debugger_interrupt_critical at debugger-agent.c:2708), user_data=0xb04dc718) at mono-threads.c:1358:19
    frame #2: 0x00222799 WatchWCSessionAppWatchOSExtension`notify_thread(key=0x03994508, value=0x81378c00, user_data=0x00000000) at debugger-agent.c:2747:2
    frame #3: 0x00355bd8 WatchWCSessionAppWatchOSExtension`mono_g_hash_table_foreach(hash=0x8007b4e0, func=(WatchWCSessionAppWatchOSExtension`notify_thread at debugger-agent.c:2733), user_data=0x00000000) at mono-hash.c:310:4
    frame #4: 0x0021e955 WatchWCSessionAppWatchOSExtension`suspend_vm at debugger-agent.c:2844:3
    frame #5: 0x00225ff0 WatchWCSessionAppWatchOSExtension`process_event(event=EVENT_KIND_THREAD_START, arg=0x039945d0, il_offset=0, ctx=0x00000000, events=0x805b28e0, suspend_policy=2) at debugger-agent.c:4012:3
    frame #6: 0x00227c7c WatchWCSessionAppWatchOSExtension`process_profiler_event(event=EVENT_KIND_THREAD_START, arg=0x039945d0) at debugger-agent.c:4072:2
    frame #7: 0x0021b174 WatchWCSessionAppWatchOSExtension`thread_startup(prof=0x00000000, tid=2957889536) at debugger-agent.c:4149:2
    frame #8: 0x0037912d WatchWCSessionAppWatchOSExtension`mono_profiler_raise_thread_started(tid=2957889536) at profiler-events.h:103:1
    frame #9: 0x003d53da WatchWCSessionAppWatchOSExtension`fire_attach_profiler_events(tid=0xb04dd000) at threads.c:1120:2
    frame #10: 0x003d4d83 WatchWCSessionAppWatchOSExtension`mono_thread_attach(domain=0x801750a0) at threads.c:1547:2
    frame #11: 0x003df1a1 WatchWCSessionAppWatchOSExtension`mono_threads_attach_coop_internal(domain=0x801750a0, cookie=0xb04dcc0c, stackdata=0xb04dcba8) at threads.c:6008:3
    frame #12: 0x003df287 WatchWCSessionAppWatchOSExtension`mono_threads_attach_coop(domain=0x00000000, dummy=0xb04dcc0c) at threads.c:6045:9
    frame #13: 0x005034b8 WatchWCSessionAppWatchOSExtension`::xamarin_switch_gchandle(self=0x80762c20, to_weak=false) at runtime.m:1805:2
    frame #14: 0x005065c1 WatchWCSessionAppWatchOSExtension`::xamarin_retain_trampoline(self=0x80762c20, sel="retain") at trampolines.m:693:2
    frame #15: 0x657ea520 libobjc.A.dylib`objc_retain + 64
    frame #16: 0x4b4d9caa WatchConnectivity`__66-[WCSession onqueue_handleDictionaryMessageRequest:withPairingID:]_block_invoke + 279
    frame #17: 0x453c7df7 Foundation`__NSBLOCKOPERATION_IS_CALLING_OUT_TO_A_BLOCK__ + 12
    frame #18: 0x453c7cf4 Foundation`-[NSBlockOperation main] + 88
    frame #19: 0x453cacee Foundation`__NSOPERATION_IS_INVOKING_MAIN__ + 27
    frame #20: 0x453c6ebd Foundation`-[NSOperation start] + 835
    frame #21: 0x453cb606 Foundation`__NSOPERATIONQUEUE_IS_STARTING_AN_OPERATION__ + 27
    frame #22: 0x453cb12e Foundation`__NSOQSchedule_f + 194
    frame #23: 0x453cb26e Foundation`____addOperations_block_invoke_4 + 20
    frame #24: 0x65de007b libdispatch.dylib`_dispatch_call_block_and_release + 15
    frame #25: 0x65de126f libdispatch.dylib`_dispatch_client_callout + 14
    frame #26: 0x65de3788 libdispatch.dylib`_dispatch_continuation_pop + 421
    frame #27: 0x65de2ee3 libdispatch.dylib`_dispatch_async_redirect_invoke + 818
    frame #28: 0x65df087d libdispatch.dylib`_dispatch_root_queue_drain + 354
    frame #29: 0x65df0ff3 libdispatch.dylib`_dispatch_worker_thread2 + 109
    frame #30: 0x66024fa0 libsystem_pthread.dylib`_pthread_wqthread + 208
    frame #31: 0x66024e44 libsystem_pthread.dylib`start_wqthread + 36
```

Going further, `info` is about this thread:
```
(lldb) p/x *(int *)(((char *) info->node.key) + 0xa0)
(int) $2 = 0x01243f93
(lldb) thread list
Process 12832 stopped
  thread #1: tid = 0x1243ee1, 0x65f7e396 libsystem_kernel.dylib`mach_msg_trap + 10, name = 'tid_303', queue = 'com.apple.main-thread'
  thread #2: tid = 0x1243ee6, 0x65f816e2 libsystem_kernel.dylib`__recvfrom + 10
  thread #3: tid = 0x1243ee7, 0x65f81aea libsystem_kernel.dylib`__psynch_cvwait + 10, name = 'SGen worker'
  thread #4: tid = 0x1243ee9, 0x65f7e3d2 libsystem_kernel.dylib`semaphore_wait_trap + 10, name = 'Finalizer'
  thread #5: tid = 0x1243eea, 0x65f816e2 libsystem_kernel.dylib`__recvfrom + 10, name = 'Debugger agent'
  thread #6: tid = 0x1243f1d, 0x65f7e396 libsystem_kernel.dylib`mach_msg_trap + 10, name = 'com.apple.uikit.eventfetch-thread'
  thread #8: tid = 0x1243f93, 0x65f7e396 libsystem_kernel.dylib`mach_msg_trap + 10, name = 'tid_6d0f', queue = 'NSOperationQueue 0x8069b300 (QOS: UTILITY)'
* thread #9: tid = 0x12443a9, 0x00222870 WatchWCSessionAppWatchOSExtension`debugger_interrupt_critical(info=0x81365400, user_data=0xb04dc718) at debugger-agent.c:2716:6, name = 'tid_a31f', queue = 'NSOperationQueue 0x8069b670 (QOS: UTILITY)', stop reason = breakpoint 1.1
  thread #10: tid = 0x1244581, 0x65f7fd32 libsystem_kernel.dylib`__workq_kernreturn + 10
(lldb) thread select 8
* thread #8, name = 'tid_6d0f', queue = 'NSOperationQueue 0x8069b300 (QOS: UTILITY)'
    frame #0: 0x65f7e396 libsystem_kernel.dylib`mach_msg_trap + 10
libsystem_kernel.dylib`mach_msg_trap:
->  0x65f7e396 <+10>: retl
    0x65f7e397 <+11>: nop

libsystem_kernel.dylib`mach_msg_overwrite_trap:
    0x65f7e398 <+0>:  movl   $0xffffffe0, %eax         ; imm = 0xFFFFFFE0
    0x65f7e39d <+5>:  calll  0x65f85f44                ; _sysenter_trap
(lldb) bt
* thread #8, name = 'tid_6d0f', queue = 'NSOperationQueue 0x8069b300 (QOS: UTILITY)'
  * frame #0: 0x65f7e396 libsystem_kernel.dylib`mach_msg_trap + 10
    frame #1: 0x65f7e8ff libsystem_kernel.dylib`mach_msg + 47
    frame #2: 0x66079679 libxpc.dylib`_xpc_send_serializer + 104
    frame #3: 0x660794da libxpc.dylib`_xpc_pipe_simpleroutine + 80
    frame #4: 0x66079852 libxpc.dylib`xpc_pipe_simpleroutine + 43
    frame #5: 0x66043a8f libsystem_trace.dylib`___os_activity_stream_reflect_block_invoke_2 + 30
    frame #6: 0x65de126f libdispatch.dylib`_dispatch_client_callout + 14
    frame #7: 0x65de3d71 libdispatch.dylib`_dispatch_block_invoke_direct + 257
    frame #8: 0x65de3c62 libdispatch.dylib`dispatch_block_perform + 112
    frame #9: 0x6604349a libsystem_trace.dylib`_os_activity_stream_reflect + 725
    frame #10: 0x6604ef19 libsystem_trace.dylib`_os_log_impl_stream + 468
    frame #11: 0x6604e44d libsystem_trace.dylib`_os_log_impl_flatten_and_send + 6410
    frame #12: 0x6604cb3b libsystem_trace.dylib`_os_log + 137
    frame #13: 0x6604f4aa libsystem_trace.dylib`_os_log_impl + 31
    frame #14: 0x4b4eb4e9 WatchConnectivity`WCSerializePayloadDictionary + 393
    frame #15: 0x4b4d7c4d WatchConnectivity`-[WCSession onqueue_sendResponseDictionary:identifier:] + 195
    frame #16: 0x4b4da435 WatchConnectivity`__66-[WCSession onqueue_handleDictionaryMessageRequest:withPairingID:]_block_invoke.411 + 35
    frame #17: 0x453c7df7 Foundation`__NSBLOCKOPERATION_IS_CALLING_OUT_TO_A_BLOCK__ + 12
    frame #18: 0x453c7cf4 Foundation`-[NSBlockOperation main] + 88
    frame #19: 0x453cacee Foundation`__NSOPERATION_IS_INVOKING_MAIN__ + 27
    frame #20: 0x453c6ebd Foundation`-[NSOperation start] + 835
    frame #21: 0x453cb606 Foundation`__NSOPERATIONQUEUE_IS_STARTING_AN_OPERATION__ + 27
    frame #22: 0x453cb12e Foundation`__NSOQSchedule_f + 194
    frame #23: 0x453cb067 Foundation`____addOperations_block_invoke_2 + 20
    frame #24: 0x65dedf49 libdispatch.dylib`_dispatch_block_async_invoke2 + 77
    frame #25: 0x65de4461 libdispatch.dylib`_dispatch_block_async_invoke_and_release + 17
    frame #26: 0x65de126f libdispatch.dylib`_dispatch_client_callout + 14
    frame #27: 0x65de3788 libdispatch.dylib`_dispatch_continuation_pop + 421
    frame #28: 0x65de2ee3 libdispatch.dylib`_dispatch_async_redirect_invoke + 818
    frame #29: 0x65df087d libdispatch.dylib`_dispatch_root_queue_drain + 354
    frame #30: 0x65df0ff3 libdispatch.dylib`_dispatch_worker_thread2 + 109
    frame #31: 0x66024fa0 libsystem_pthread.dylib`_pthread_wqthread + 208
    frame #32: 0x66024e44 libsystem_pthread.dylib`start_wqthread + 36
```
which is a thread in a "light" detach state (aka. coop detach), where we only unset the domain:
https://github.com/mono/mono/blob/4cefdcb7ce2d939ee78fb45d1b4913eb3bc064fd/mono/metadata/threads.c#L6084-L6111

Fixes #17926



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Backport of #18105.

/cc @lewurm
@fanyang-mono fanyang-mono mentioned this pull request Dec 17, 2019
Closed
ManickaP pushed a commit to ManickaP/runtime that referenced this pull request Jan 20, 2020
@lewurm
[threads] clear small_id_key TLS when unregistering a thread (mono/mo…
0fe830c 
…no#16973)

* [threads] clear small_id_key TLS when unregistering a thread

Fixes
```
* thread mono/mono#12, name = 'tid_a507', stop reason = EXC_BREAKPOINT (code=1, subcode=0x1be66144)
  * frame mono/mono#0: 0x1be66144 libsystem_c.dylib`__abort + 184
    frame mono/mono#1: 0x1be6608c libsystem_c.dylib`abort + 152
    frame mono/mono#2: 0x003e1fa0 monotouchtest`log_callback(log_domain=0x00000000, log_level="error", message="* Assertion at ../../../../../mono/utils/hazard-pointer.c:158, condition `mono_bitset_test_fast (small_id_table, id)' not met\n", fatal=4, user_data=0x00000000) at runtime.m:1251:3
    frame mono/mono#3: 0x003abf44 monotouchtest`monoeg_g_logv_nofree(log_domain=0x00000000, log_level=G_LOG_LEVEL_ERROR, format=<unavailable>, args=<unavailable>) at goutput.c:149:2 [opt]
    frame mono/mono#4: 0x003abfb4 monotouchtest`monoeg_assertion_message(format=<unavailable>) at goutput.c:184:22 [opt]
    frame mono/mono#5: 0x003904dc monotouchtest`mono_thread_small_id_free(id=<unavailable>) at hazard-pointer.c:0:2 [opt]
    frame mono/mono#6: 0x003a0a74 monotouchtest`unregister_thread(arg=0x15c88400) at mono-threads.c:588:2 [opt]
    frame mono/mono#7: 0x00336110 monotouchtest`mono_thread_detach_if_exiting at threads.c:1571:4 [opt]
    frame mono/mono#8: 0x003e7a14 monotouchtest`::xamarin_release_trampoline(self=0x166452f0, sel="release") at trampolines.m:644:3
    frame mono/mono#9: 0x001cdc40 monotouchtest`::-[__Xamarin_NSTimerActionDispatcher release](self=0x166452f0, _cmd="release") at registrar.m:83445:3
    frame mono/mono#10: 0x1ce2ae68 Foundation`_timerRelease + 80
    frame mono/mono#11: 0x1c31b56c CoreFoundation`CFRunLoopTimerInvalidate + 612
    frame mono/mono#12: 0x1c31a554 CoreFoundation`__CFRunLoopTimerDeallocate + 32
    frame mono/mono#13: 0x1c31dde4 CoreFoundation`_CFRelease + 220
    frame mono/mono#14: 0x1c2be6e8 CoreFoundation`__CFArrayReleaseValues + 500
    frame mono/mono#15: 0x1c2be4c4 CoreFoundation`CFArrayRemoveAllValues + 104
    frame mono/mono#16: 0x1c31ff64 CoreFoundation`__CFSetApplyFunction_block_invoke + 24
    frame mono/mono#17: 0x1c3b2e18 CoreFoundation`CFBasicHashApply + 116
    frame mono/mono#18: 0x1c31ff10 CoreFoundation`CFSetApplyFunction + 160
    frame mono/mono#19: 0x1c3152cc CoreFoundation`__CFRunLoopDeallocate + 204
    frame mono/mono#20: 0x1c31dde4 CoreFoundation`_CFRelease + 220
    frame mono/mono#21: 0x1c304a80 CoreFoundation`__CFTSDFinalize + 144
    frame mono/mono#22: 0x1bfa324c libsystem_pthread.dylib`_pthread_tsd_cleanup + 644
    frame mono/mono#23: 0x1bf9cc08 libsystem_pthread.dylib`_pthread_exit + 80
    frame mono/mono#24: 0x1bf9af24 libsystem_pthread.dylib`pthread_exit + 36
    frame mono/mono#25: 0x0039df84 monotouchtest`mono_threads_platform_exit(exit_code=<unavailable>) at mono-threads-posix.c:145:2 [opt]
    frame mono/mono#26: 0x0033bb84 monotouchtest`start_wrapper(data=0x1609e1c0) at threads.c:1296:2 [opt]
    frame mono/mono#27: 0x1bf9b914 libsystem_pthread.dylib`_pthread_body + 128
    frame mono/mono#28: 0x1bf9b874 libsystem_pthread.dylib`_pthread_start + 44
    frame mono/mono#29: 0x1bfa3b94 libsystem_pthread.dylib`thread_start + 4
```

* Update mono/utils/mono-threads.c

Co-Authored-By: Aleksey Kliger (λgeek) <[email protected]>


Commit migrated from mono/mono@749493d
ManickaP pushed a commit to ManickaP/runtime that referenced this pull request Jan 20, 2020
@lewurm
[debugger] skip suspend for unattached threads (mono/mono#18105)
35f16d6 
When the debugger tries to suspend all the VM threads, it can happen with cooperative-suspend that it tries to suspend a thread that has previously been attached, but then did a "light" detach (that only unsets the domain). With the domain set to `NULL`, looking up a JitInfo for a given `ip` will result into a crash, but it isn't even necessarily needed for the purpose of suspending a thread.

More details: Consider the following:
```
(lldb) c
error: Process is running.  Use 'process interrupt' to pause execution.
Process 12832 stopped
* thread mono/mono#9, name = 'tid_a31f', queue = 'NSOperationQueue 0x8069b670 (QOS: UTILITY)', stop reason = breakpoint 1.1
    frame mono/mono#0: 0x00222870 WatchWCSessionAppWatchOSExtension`debugger_interrupt_critical(info=0x81365400, user_data=0xb04dc718) at debugger-agent.c:2716:6
   2713         MonoDomain *domain = (MonoDomain *) mono_thread_info_get_suspend_state (info)->unwind_data [MONO_UNWIND_DATA_DOMAIN];
   2714         if (!domain) {
   2715                 /* not attached */
-> 2716                 ji = NULL;
   2717         } else {
   2718                 ji = mono_jit_info_table_find_internal ( domain, MONO_CONTEXT_GET_IP (&mono_thread_info_get_suspend_state (info)->ctx), TRUE, TRUE);
   2719         }
Target 0: (WatchWCSessionAppWatchOSExtension) stopped.
(lldb) bt
* thread mono/mono#9, name = 'tid_a31f', queue = 'NSOperationQueue 0x8069b670 (QOS: UTILITY)', stop reason = breakpoint 1.1
  * frame mono/mono#0: 0x00222870 WatchWCSessionAppWatchOSExtension`debugger_interrupt_critical(info=0x81365400, user_data=0xb04dc718) at debugger-agent.c:2716:6
    frame mono/mono#1: 0x004e177b WatchWCSessionAppWatchOSExtension`mono_thread_info_safe_suspend_and_run(id=0xb0767000, interrupt_kernel=0, callback=(WatchWCSessionAppWatchOSExtension`debugger_interrupt_critical at debugger-agent.c:2708), user_data=0xb04dc718) at mono-threads.c:1358:19
    frame mono/mono#2: 0x00222799 WatchWCSessionAppWatchOSExtension`notify_thread(key=0x03994508, value=0x81378c00, user_data=0x00000000) at debugger-agent.c:2747:2
    frame mono/mono#3: 0x00355bd8 WatchWCSessionAppWatchOSExtension`mono_g_hash_table_foreach(hash=0x8007b4e0, func=(WatchWCSessionAppWatchOSExtension`notify_thread at debugger-agent.c:2733), user_data=0x00000000) at mono-hash.c:310:4
    frame mono/mono#4: 0x0021e955 WatchWCSessionAppWatchOSExtension`suspend_vm at debugger-agent.c:2844:3
    frame mono/mono#5: 0x00225ff0 WatchWCSessionAppWatchOSExtension`process_event(event=EVENT_KIND_THREAD_START, arg=0x039945d0, il_offset=0, ctx=0x00000000, events=0x805b28e0, suspend_policy=2) at debugger-agent.c:4012:3
    frame mono/mono#6: 0x00227c7c WatchWCSessionAppWatchOSExtension`process_profiler_event(event=EVENT_KIND_THREAD_START, arg=0x039945d0) at debugger-agent.c:4072:2
    frame mono/mono#7: 0x0021b174 WatchWCSessionAppWatchOSExtension`thread_startup(prof=0x00000000, tid=2957889536) at debugger-agent.c:4149:2
    frame mono/mono#8: 0x0037912d WatchWCSessionAppWatchOSExtension`mono_profiler_raise_thread_started(tid=2957889536) at profiler-events.h:103:1
    frame mono/mono#9: 0x003d53da WatchWCSessionAppWatchOSExtension`fire_attach_profiler_events(tid=0xb04dd000) at threads.c:1120:2
    frame mono/mono#10: 0x003d4d83 WatchWCSessionAppWatchOSExtension`mono_thread_attach(domain=0x801750a0) at threads.c:1547:2
    frame mono/mono#11: 0x003df1a1 WatchWCSessionAppWatchOSExtension`mono_threads_attach_coop_internal(domain=0x801750a0, cookie=0xb04dcc0c, stackdata=0xb04dcba8) at threads.c:6008:3
    frame mono/mono#12: 0x003df287 WatchWCSessionAppWatchOSExtension`mono_threads_attach_coop(domain=0x00000000, dummy=0xb04dcc0c) at threads.c:6045:9
    frame mono/mono#13: 0x005034b8 WatchWCSessionAppWatchOSExtension`::xamarin_switch_gchandle(self=0x80762c20, to_weak=false) at runtime.m:1805:2
    frame mono/mono#14: 0x005065c1 WatchWCSessionAppWatchOSExtension`::xamarin_retain_trampoline(self=0x80762c20, sel="retain") at trampolines.m:693:2
    frame mono/mono#15: 0x657ea520 libobjc.A.dylib`objc_retain + 64
    frame mono/mono#16: 0x4b4d9caa WatchConnectivity`__66-[WCSession onqueue_handleDictionaryMessageRequest:withPairingID:]_block_invoke + 279
    frame mono/mono#17: 0x453c7df7 Foundation`__NSBLOCKOPERATION_IS_CALLING_OUT_TO_A_BLOCK__ + 12
    frame mono/mono#18: 0x453c7cf4 Foundation`-[NSBlockOperation main] + 88
    frame mono/mono#19: 0x453cacee Foundation`__NSOPERATION_IS_INVOKING_MAIN__ + 27
    frame mono/mono#20: 0x453c6ebd Foundation`-[NSOperation start] + 835
    frame mono/mono#21: 0x453cb606 Foundation`__NSOPERATIONQUEUE_IS_STARTING_AN_OPERATION__ + 27
    frame mono/mono#22: 0x453cb12e Foundation`__NSOQSchedule_f + 194
    frame mono/mono#23: 0x453cb26e Foundation`____addOperations_block_invoke_4 + 20
    frame mono/mono#24: 0x65de007b libdispatch.dylib`_dispatch_call_block_and_release + 15
    frame mono/mono#25: 0x65de126f libdispatch.dylib`_dispatch_client_callout + 14
    frame mono/mono#26: 0x65de3788 libdispatch.dylib`_dispatch_continuation_pop + 421
    frame mono/mono#27: 0x65de2ee3 libdispatch.dylib`_dispatch_async_redirect_invoke + 818
    frame mono/mono#28: 0x65df087d libdispatch.dylib`_dispatch_root_queue_drain + 354
    frame mono/mono#29: 0x65df0ff3 libdispatch.dylib`_dispatch_worker_thread2 + 109
    frame mono/mono#30: 0x66024fa0 libsystem_pthread.dylib`_pthread_wqthread + 208
    frame mono/mono#31: 0x66024e44 libsystem_pthread.dylib`start_wqthread + 36
```

Going further, `info` is about this thread:
```
(lldb) p/x *(int *)(((char *) info->node.key) + 0xa0)
(int) $2 = 0x01243f93
(lldb) thread list
Process 12832 stopped
  thread mono/mono#1: tid = 0x1243ee1, 0x65f7e396 libsystem_kernel.dylib`mach_msg_trap + 10, name = 'tid_303', queue = 'com.apple.main-thread'
  thread mono/mono#2: tid = 0x1243ee6, 0x65f816e2 libsystem_kernel.dylib`__recvfrom + 10
  thread mono/mono#3: tid = 0x1243ee7, 0x65f81aea libsystem_kernel.dylib`__psynch_cvwait + 10, name = 'SGen worker'
  thread mono/mono#4: tid = 0x1243ee9, 0x65f7e3d2 libsystem_kernel.dylib`semaphore_wait_trap + 10, name = 'Finalizer'
  thread mono/mono#5: tid = 0x1243eea, 0x65f816e2 libsystem_kernel.dylib`__recvfrom + 10, name = 'Debugger agent'
  thread mono/mono#6: tid = 0x1243f1d, 0x65f7e396 libsystem_kernel.dylib`mach_msg_trap + 10, name = 'com.apple.uikit.eventfetch-thread'
  thread mono/mono#8: tid = 0x1243f93, 0x65f7e396 libsystem_kernel.dylib`mach_msg_trap + 10, name = 'tid_6d0f', queue = 'NSOperationQueue 0x8069b300 (QOS: UTILITY)'
* thread mono/mono#9: tid = 0x12443a9, 0x00222870 WatchWCSessionAppWatchOSExtension`debugger_interrupt_critical(info=0x81365400, user_data=0xb04dc718) at debugger-agent.c:2716:6, name = 'tid_a31f', queue = 'NSOperationQueue 0x8069b670 (QOS: UTILITY)', stop reason = breakpoint 1.1
  thread mono/mono#10: tid = 0x1244581, 0x65f7fd32 libsystem_kernel.dylib`__workq_kernreturn + 10
(lldb) thread select 8
* thread mono/mono#8, name = 'tid_6d0f', queue = 'NSOperationQueue 0x8069b300 (QOS: UTILITY)'
    frame mono/mono#0: 0x65f7e396 libsystem_kernel.dylib`mach_msg_trap + 10
libsystem_kernel.dylib`mach_msg_trap:
->  0x65f7e396 <+10>: retl
    0x65f7e397 <+11>: nop

libsystem_kernel.dylib`mach_msg_overwrite_trap:
    0x65f7e398 <+0>:  movl   $0xffffffe0, %eax         ; imm = 0xFFFFFFE0
    0x65f7e39d <+5>:  calll  0x65f85f44                ; _sysenter_trap
(lldb) bt
* thread mono/mono#8, name = 'tid_6d0f', queue = 'NSOperationQueue 0x8069b300 (QOS: UTILITY)'
  * frame mono/mono#0: 0x65f7e396 libsystem_kernel.dylib`mach_msg_trap + 10
    frame mono/mono#1: 0x65f7e8ff libsystem_kernel.dylib`mach_msg + 47
    frame mono/mono#2: 0x66079679 libxpc.dylib`_xpc_send_serializer + 104
    frame mono/mono#3: 0x660794da libxpc.dylib`_xpc_pipe_simpleroutine + 80
    frame mono/mono#4: 0x66079852 libxpc.dylib`xpc_pipe_simpleroutine + 43
    frame mono/mono#5: 0x66043a8f libsystem_trace.dylib`___os_activity_stream_reflect_block_invoke_2 + 30
    frame mono/mono#6: 0x65de126f libdispatch.dylib`_dispatch_client_callout + 14
    frame mono/mono#7: 0x65de3d71 libdispatch.dylib`_dispatch_block_invoke_direct + 257
    frame mono/mono#8: 0x65de3c62 libdispatch.dylib`dispatch_block_perform + 112
    frame mono/mono#9: 0x6604349a libsystem_trace.dylib`_os_activity_stream_reflect + 725
    frame mono/mono#10: 0x6604ef19 libsystem_trace.dylib`_os_log_impl_stream + 468
    frame mono/mono#11: 0x6604e44d libsystem_trace.dylib`_os_log_impl_flatten_and_send + 6410
    frame mono/mono#12: 0x6604cb3b libsystem_trace.dylib`_os_log + 137
    frame mono/mono#13: 0x6604f4aa libsystem_trace.dylib`_os_log_impl + 31
    frame mono/mono#14: 0x4b4eb4e9 WatchConnectivity`WCSerializePayloadDictionary + 393
    frame mono/mono#15: 0x4b4d7c4d WatchConnectivity`-[WCSession onqueue_sendResponseDictionary:identifier:] + 195
    frame mono/mono#16: 0x4b4da435 WatchConnectivity`__66-[WCSession onqueue_handleDictionaryMessageRequest:withPairingID:]_block_invoke.411 + 35
    frame mono/mono#17: 0x453c7df7 Foundation`__NSBLOCKOPERATION_IS_CALLING_OUT_TO_A_BLOCK__ + 12
    frame mono/mono#18: 0x453c7cf4 Foundation`-[NSBlockOperation main] + 88
    frame mono/mono#19: 0x453cacee Foundation`__NSOPERATION_IS_INVOKING_MAIN__ + 27
    frame mono/mono#20: 0x453c6ebd Foundation`-[NSOperation start] + 835
    frame mono/mono#21: 0x453cb606 Foundation`__NSOPERATIONQUEUE_IS_STARTING_AN_OPERATION__ + 27
    frame mono/mono#22: 0x453cb12e Foundation`__NSOQSchedule_f + 194
    frame mono/mono#23: 0x453cb067 Foundation`____addOperations_block_invoke_2 + 20
    frame mono/mono#24: 0x65dedf49 libdispatch.dylib`_dispatch_block_async_invoke2 + 77
    frame mono/mono#25: 0x65de4461 libdispatch.dylib`_dispatch_block_async_invoke_and_release + 17
    frame mono/mono#26: 0x65de126f libdispatch.dylib`_dispatch_client_callout + 14
    frame mono/mono#27: 0x65de3788 libdispatch.dylib`_dispatch_continuation_pop + 421
    frame mono/mono#28: 0x65de2ee3 libdispatch.dylib`_dispatch_async_redirect_invoke + 818
    frame mono/mono#29: 0x65df087d libdispatch.dylib`_dispatch_root_queue_drain + 354
    frame mono/mono#30: 0x65df0ff3 libdispatch.dylib`_dispatch_worker_thread2 + 109
    frame mono/mono#31: 0x66024fa0 libsystem_pthread.dylib`_pthread_wqthread + 208
    frame mono/mono#32: 0x66024e44 libsystem_pthread.dylib`start_wqthread + 36
```
which is a thread in a "light" detach state (aka. coop detach), where we only unset the domain:
https://github.com/mono/mono/blob/mono/mono@4cefdcb7ce2d939ee78fb45d1b4913eb3bc064fd/mono/metadata/threads.c#L6084-L6111

Fixes mono/mono#17926

Commit migrated from mono/mono@80b1e10
@fanyang-mono fanyang-mono mentioned this pull request Mar 3, 2020
Closed
@jbatt33 jbatt33 mentioned this pull request Sep 12, 2023
Open
This pull request was closed.
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9 participants

@atsushieno @pennae @marek-safar @kumpera @illupus @gonzalop @grendello @vargaz @madewokherd