[Bug 1920107] Re: Failed messages of sd-umoun show with reboot/shutdown

[Michael Vogt]

** Package changed: snapd (Ubuntu) => systemd (Ubuntu)

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Title:
  Failed messages of sd-umoun show with reboot/shutdown

Status in snapd:
  New
Status in systemd package in Ubuntu:
  New

Bug description:
  We were seeing the same sequence of errors heppened on KVM and ARM
  device running UC20:

  """
  [12450.684692] sd-umoun[5922]: Failed to unmount /oldroot: Device or resource busy
  [12450.693515] sd-remou[5923]: Failed to remount '/oldroot/run/mnt/data' read-only: Device or resource busy
  [12450.704374] sd-umoun[5924]: Failed to unmount /oldroot/run/mnt/data: Device or resource busy
  [12450.714225] sd-umoun[5925]: Failed to unmount /oldroot/run: Device or resource busy
  [12450.726073] shutdown[1]: Could not detach loopback /dev/loop0: Device or resource busy
  [12450.735481] shutdown[1]: Failed to finalize file systems, loop devices, ignoring
  [12451.129165] reboot: Power down
  """

  [Steps to reproduce]

  $ sudo poweroff or $ sudo reboot

  There are few issues may be relevant but the PR listed on below was
  not useful for this case.

  https://github.com/systemd/systemd/issues/14298
  https://github.com/systemd/systemd/issues/14981
  https://github.com/systemd/systemd/pull/15566

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