New OverlayUnmountError with 5.21 lxd

[tigarmo]

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

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Environment

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rockcraft.yaml

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Relevant log output

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.

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The internal ticket has been created: https://warthogs.atlassian.net/browse/CRAFT-3307.

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