[Bug 1920107] Re: Failed messages of sd-umount shown with reboot/shutdown

[Ian Johnson]

I continue to see these messages on all UC20 VM's I use, including the
most recently released stable image on cdimage when booted in a VM

** Changed in: snapd
       Status: Expired => Confirmed

** Changed in: snapd
   Importance: Undecided => Medium

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Title:
  Failed messages of sd-umount shown with reboot/shutdown

Status in snapd:
  Confirmed
Status in finalrd package in Ubuntu:
  Invalid

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

  [Additional info]

  http://cdimage.ubuntu.com/ubuntu-core/20/stable/current/ubuntu-
  core-20-amd64.img.xz

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