[Bug 1928200] Re: Prompt error message "Failed to unmount /oldroot" when shutdown or reboot

[Dan Streetman]

** Description changed:

+ [impact]
+ 
+ root fs is not cleanly unmounted on shutdown
+ 
+ [test case]
+ 
+ create a file in /etc/binfmt.d/TestFormat.conf with the following
+ content:
+ 
+ :TestFormat:M::XX::/bin/true:F
+ 
+ reboot the system, and then shutdown or reboot again, and watch the
+ serial console for the error message
+ 
+ [regression potential]
+ 
+ any regression would likely cause problems on shutdown and/or reboot, or
+ may cause problems with unmounted root fs on shutdown/reboot
+ 
+ [scope]
+ 
+ this is needed only for f
+ 
+ this is fixed upstream with PR 15566 which is included in v246, so this
+ is fixed already in g and later
+ 
+ this isn't reproducable on b
+ 
+ [original description]
+ 
  On ubuntu 20.04, with latest kernel and systemd, it will show error on
  ThinkPad X1.
  
  sd-umount[1334]: Failed to unmount /oldroot: Device or resource busy
  
- systemd 245.4-4ubuntu3.6 
+ systemd 245.4-4ubuntu3.6
  kernel: 5.8.0-53

** Description changed:

  [impact]
  
  root fs is not cleanly unmounted on shutdown
  
  [test case]
  
  create a file in /etc/binfmt.d/TestFormat.conf with the following
  content:
  
  :TestFormat:M::XX::/bin/true:F
  
  reboot the system, and then shutdown or reboot again, and watch the
- serial console for the error message
+ serial console for the error message:
+ 
+ sd-umount[1334]: Failed to unmount /oldroot: Device or resource busy
  
  [regression potential]
  
  any regression would likely cause problems on shutdown and/or reboot, or
  may cause problems with unmounted root fs on shutdown/reboot
  
  [scope]
  
  this is needed only for f
  
  this is fixed upstream with PR 15566 which is included in v246, so this
  is fixed already in g and later
  
  this isn't reproducable on b
  
  [original description]
  
  On ubuntu 20.04, with latest kernel and systemd, it will show error on
  ThinkPad X1.
  
  sd-umount[1334]: Failed to unmount /oldroot: Device or resource busy
  
  systemd 245.4-4ubuntu3.6
  kernel: 5.8.0-53

** Also affects: systemd (Ubuntu Focal)
   Importance: Undecided
       Status: New

** Changed in: systemd (Ubuntu)
       Status: New => Fix Released

** Changed in: systemd (Ubuntu Focal)
       Status: New => In Progress

** Changed in: systemd (Ubuntu Focal)
   Importance: Undecided => High

** Changed in: systemd (Ubuntu Focal)
     Assignee: (unassigned) => Dan Streetman (ddstreet)

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https://bugs.launchpad.net/bugs/1928200

Title:
  Prompt error message "Failed to unmount /oldroot" when shutdown or
  reboot

Status in OEM Priority Project:
  New
Status in systemd package in Ubuntu:
  Fix Released
Status in systemd source package in Focal:
  In Progress

Bug description:
  [impact]

  root fs is not cleanly unmounted on shutdown

  [test case]

  create a file in /etc/binfmt.d/TestFormat.conf with the following
  content:

  :TestFormat:M::XX::/bin/true:F

  reboot the system, and then shutdown or reboot again, and watch the
  serial console for the error message:

  sd-umount[1334]: Failed to unmount /oldroot: Device or resource busy

  [regression potential]

  any regression would likely cause problems on shutdown and/or reboot,
  or may cause problems with unmounted root fs on shutdown/reboot

  [scope]

  this is needed only for f

  this is fixed upstream with PR 15566 which is included in v246, so
  this is fixed already in g and later

  this isn't reproducable on b

  [original description]

  On ubuntu 20.04, with latest kernel and systemd, it will show error on
  ThinkPad X1.

  sd-umount[1334]: Failed to unmount /oldroot: Device or resource busy

  systemd 245.4-4ubuntu3.6
  kernel: 5.8.0-53

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