[Bug 1951706] [NEW] Failed to unmount /oldroot/dev/pts: Device or resource busy

[Steve Langasek]

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

Status in finalrd package in Ubuntu:
  New

Bug description:
  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.

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