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gh-140431: Fix GC crash due to partially initialized coroutines #140470

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Merged
colesbury merged 1 commit into from
Oct 23, 2025
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gh-140431: Fix GC crash due to partially initialized coroutines #140470

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gh-140431: Fix GC crash due to partially initialized coroutines 
The `make_gen()` function creates and tracks generator/coro objects, but
doesn't fully initialize all the fields. At a minimum, we need to
initialize all the fields that may be accessed by gen_traverse because
the call to `compute_cr_origin()` can trigger a GC.
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@colesbury
colesbury committed Oct 22, 2025
commit c1e2a6eb62c4271431d2455281b5b10d9aa3f1c2
3 changes: 3 additions & 0 deletions Misc/NEWS.d/next/Core_and_Builtins/2025-10-22-17-22-22.gh-issue-140431.m8D_A-.rst
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Original file line number Diff line number Diff line change
@@ -0,0 +1,3 @@
Fix a crash in Python's :term:`garbage collector <garbage collection>` due to
partially initialized :term:`coroutine` objects when coroutine origin tracking
depth is enabled (:func:`sys.set_coroutine_origin_tracking_depth`).
1 change: 1 addition & 0 deletions Objects/genobject.c
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Expand Up @@ -932,6 +932,7 @@ make_gen(PyTypeObject *type, PyFunctionObject *func)
gen->gi_weakreflist = NULL;
gen->gi_exc_state.exc_value = NULL;
gen->gi_exc_state.previous_item = NULL;
gen->gi_iframe.f_executable = PyStackRef_None;
assert(func->func_name != NULL);
gen->gi_name = Py_NewRef(func->func_name);
assert(func->func_qualname != NULL);
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