Failed to create dm device: Device or resource busy error if previous update process is terminated #1676
Description
Describe the bug
If rauc install process is terminated, the next run will fail with the following error:
(rauc:799): rauc-WARNING **: 19:53:51.711: Failed mounting bundle: Failed to create dm device: Device or resource busy
Failed mounting bundle: Failed to create dm device: Device or resource busy
Background information
- rauc 1.13
- Yocto Scarthgap
- Service is disabled
- SAM9X60 (ARM9) CPU
- Rootfs is ubifs on NAND
I'm trying to integrate rauc into our existing system to replace our own OTA utils. I need to develop pre/post install handlers to mount/umount ubi volumes, since doing a full upgrade is time consuming I pressed ctrl+c in the middle and rauc entered a blocking state.
Reading dm.c, I think a handler should be added to clean up dangling rauc-verity-bundle mapping in r_dm_setup().
The clean up is to umount dangling bundle mount, once bundle is unmounted /dev/dm-0 will be freed.
/dev/dm-0 on /run/rauc/bundle type squashfs (ro,nosuid,nodev,relatime,errors=continue)
To Reproduce
Steps to reproduce the behavior:
- Run 1st install
rauc install --override-boot-slot=a -d http://192.168.8.1:8080/bundle.raucb - Press Ctrl+C in the process
- Relaunch the install
Expected behavior
A clear and concise description of what you expected to happen.
Logs
rauc-Message: 19:53:51.157: Remote URI detected, streaming bundle...
rauc-nbd-Message: 19:53:51.157: starting the nbd server
rauc-nbd-Message: 19:53:51.201: sending config request to nbd server: {'url': <'http://192.168.8.1:8080/bundle-dev.raucb'>, 'info-headers': <@as []>}
rauc-nbd-Message: 19:53:51.378: nbd server running as UID 65534, GID 65534
rauc-nbd-Message: 19:53:51.415: nbd server received configuration: {'url': <'http://192.168.8.1:8080/bundle-dev.raucb'>, 'info-headers': <@as []>}
rauc-nbd-Message: 19:53:51.416: nbd server configuring for URL: http://192.168.8.1:8080/bundle-dev.raucb
rauc-nbd-Message: 19:53:51.426: nbd server received HTTP server date 1743105198
rauc-nbd-Message: 19:53:51.428: nbd server received total size 36374418
rauc-nbd-Message: 19:53:51.428: nbd server received HTTP file date 1743094843
(process:801): rauc-nbd-WARNING **: 19:53:51.430: using HTTP/1 for streaming, expect slow installation; enable HTTP/2 if possible
rauc-nbd-Message: 19:53:51.433: received HTTP server info: total size 36.4?MB (36374418 bytes)
rauc-nbd-Message: 19:53:51.435: received HTTP server info: current time 2025-03-27 19:53:18 (1743105198)
rauc-nbd-Message: 19:53:51.435: received HTTP server info: modified time 2025-03-27 17:00:43 (1743094843)
rauc-nbd-Message: 19:53:51.436: the nbd server was started
rauc-Message: 19:53:51.436: Reading bundle: http://192.168.8.1:8080/bundle-dev.raucb
(rauc:799): rauc-DEBUG: 19:53:51.487: Found valid CMS data
rauc-Message: 19:53:51.501: Verifying bundle signature...
10% Verifying signature
: detected capacity change from 0 to 71040
rauc-Message: 19:53:51.531: Verified inline signature by 'O = Test Org, CN = Test Org Development-1'
20% Verifying signature done.
(rauc:799): rauc-DEBUG: 19:53:51.538: Got 2 elements for trust chain
20% Checking bundle done.
rauc-Message: 19:53:51.542: Mounting bundle 'http://192.168.8.1:8080/bundle-dev.raucb' to '/run/rauc/bundle'
rauc-nbd-Message: 19:53:51.543: configuring nbd device
CONNECT
block nbd1: Disconnected due to user request.
block nbd1: shutting down sockets
rauc-nbd-Message: 19:53:51.576: setup done for /dev/nbd1
20% Checking manifest contents
30% Checking manifest contents done.
rauc-event-Message: 19:53:51.587: Installation d8084824 failed: Failed mounting bundle: Failed to create dm device: Device or resource busy
100% Installing failed.
rauc-nbd-Message: 19:53:51.588: Removing nbd device /dev/nbd1
0x0 phys_seg 1 prio class 2
Buffer I/O error on dev nbd1, logical block 0, async page read
nbd1: unable to read partition table
rauc-nbd-Message: 19:53:51.652: stopping the nbd server
rauc-nbd-Message: 19:53:51.653: nbd server received disconnect request
rauc-Message: 19:53:51.654: nbd dl_size: count=4 sum=6038.000 min=4.000 max=4096.000 avg=1509.500 recent-avg=1509.500
rauc-Message: 19:53:51.655: nbd dl_speed: count=4 sum=1208056.000 min=327.000 max=769346.000 avg=302014.000 recent-avg=302014.000
rauc-Message: 19:53:51.655: nbd namelookup: count=4 sum=0.008 min=0.001 max=0.006 avg=0.002 recent-avg=0.002
rauc-Message: 19:53:51.656: nbd connect: count=4 sum=0.014 min=0.002 max=0.008 avg=0.003 recent-avg=0.003
rauc-Message: 19:53:51.657: nbd starttransfer: count=4 sum=0.022 min=0.004 max=0.009 avg=0.006 recent-avg=0.006
rauc-Message: 19:53:51.657: nbd total: count=4 sum=0.026 min=0.004 max=0.012 avg=0.007 recent-avg=0.007
rauc-nbd-Message: 19:53:51.658: downloaded 0.0% of the full bundle
rauc-nbd-Message: 19:53:51.659: nbd server exiting
rauc-nbd-Message: 19:53:51.709: the nbd server was stopped
(rauc:799): rauc-WARNING **: 19:53:51.711: Failed mounting bundle: Failed to create dm device: Device or resource busy
Failed mounting bundle: Failed to create dm device: Device or resource busy
finished