Public bug reported:
I have an armhf system which happens to not reboot from Linux, and as a
result I can clearly see all the shutdown messages on it.
It is also using lvm for the root filesystem.
On focal, it is currently failing to cleanly unmount the filesystem and
shutdown the LVM:
[67384.315925] sd-umoun[11498]: Failed to unmount /oldroot: Device or resource
busy
[67384.331584] sd-umoun[11499]: Failed to unmount /oldroot/dev/pts: Device or
resource busy
[67384.346125] sd-umoun[11500]: Failed to unmount /oldroot/dev: Device or
resource busy
[67384.359495] shutdown[1]: Could not detach DM /dev/dm-0: Device or resource
busy
[67384.400682] shutdown[1]: Failed to finalize file systems, DM devices,
ignoring
There are similar bug reports about finalrd failing, but none with this
particular list of busy filesystems, so filing a separate report.
** Affects: finalrd (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1951706
Title:
Failed to unmount /oldroot/dev/pts: Device or resource busy
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