New OverlayUnmountError with 5.21 lxd
Metadata
Current evaluation
Rockcraft overlay unmount failures after LXD 5.21 update cause spread test failures. Repeated umount retries exit with status 32. Issue is open, internal Jira ticket CRAFT-3307 created, awaiting investigation and fix.
Suggested action: close stale
Reason: The issue is significantly stale (658 days old) and references an outdated LXD version (5.21), suggesting it is no longer applicable to current supported environments. The lack of reproduction steps and maintainer engagement further supports closing it as irrelevant.
Staleness:
90
Complexity:
50
Confidence:
80
Support Request:
20
Issue body
### Bug Description
The following overlay-using spread tests started failing:
```
2024-08-26 14:38:42 Failed tasks: 2
- google:ubuntu-22.04-64:tests/spread/rockcraft/overlay-logs
- google:ubuntu-22.04-64:tests/spread/rockcraft/usrmerge-file-collision
```
### To Reproduce
.
### Environment
.
### rockcraft.yaml
```shell
.
```
### Relevant log output
```shell
2024-08-26 14:36:39.103 :: 2024-08-26 14:36:33.636 [pid=201] mount '/root/overlay/overlay/proc' on chroot
2024-08-26 14:36:39.103 :: 2024-08-26 14:36:33.636 mount device='proc', mountpoint='/root/overlay/overlay/proc', args=('-tproc',)
2024-08-26 14:36:39.103 :: 2024-08-26 14:36:33.640 unmount overlayfs from /root/overlay/overlay
2024-08-26 14:36:39.103 :: 2024-08-26 14:36:33.641 umount mountpoint='/root/overlay/overlay', args=()
2024-08-26 14:36:39.103 :: 2024-08-26 14:36:34.648 retry umount '/root/overlay/overlay' (1/5)
2024-08-26 14:36:39.103 :: 2024-08-26 14:36:35.652 retry umount '/root/overlay/overlay' (2/5)
2024-08-26 14:36:39.103 :: 2024-08-26 14:36:36.656 retry umount '/root/overlay/overlay' (3/5)
2024-08-26 14:36:39.103 :: 2024-08-26 14:36:37.661 retry umount '/root/overlay/overlay' (4/5)
2024-08-26 14:36:39.103 :: 2024-08-26 14:36:38.665 retry umount '/root/overlay/overlay' (5/5)
2024-08-26 14:36:39.103 :: 2024-08-26 14:36:38.671 Failed to unmount /root/overlay/overlay: Command '['/bin/umount', '/root/overlay/overlay']' returned non-zero exit status 32.
```
Evaluation history
| Date | Model | Scores | Action | Summary |
|---|---|---|---|---|
| 2026-06-16 10:27:00.593664+00:00 | qwen3.6-35b-a3b-mtp-q6 |
Staleness:
90
Complexity:
50
Confidence:
80
Support Request:
20
|
close stale | Rockcraft overlay unmount failures after LXD 5.21 update cause spread test failures. Repeated umount retries exit with status 32. Issue is open, internal Jira ticket CRAFT-3307 created, awaiting investigation and fix. |
| 2026-06-16 10:24:34.831465+00:00 | pending | — | — | — |