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

[Daniel]

I still have this problem, but I have solved it.


I create files

file: /etc/systemd/system/kill-plymouthd.service
[Unit]
Description=kill plymouthd
After=umount.target
DefaultDependencies=false

[Service] Type=oneshot
ExecStart=/usr/bin/pkill plymouthd

[Install] WantedBy=final.target


file: /etc/systemd/system/rm-nvidia.service
[Unit]
Description=rm nvidia modules
After=umount.target
DefaultDependencies=false

[Service] Type=oneshot
ExecStart=/usr/sbin/rmmod nvidia_uvm
ExecStart=/usr/sbin/rmmod nvidia_drm
ExecStart=/usr/sbin/rmmod nvidia_modeset
ExecStart=/usr/sbin/rmmod nvidia
ExecStart=/usr/sbin/rmmod i2c_nvidia_gpu

[Install]
WantedBy=final.target

execute:
sudo systemctl daemon-reload
sudo systemctl enable rm-nvidia.service
sudo systemctl enable kill-plymouthd.service

for debug this problem i installed finalrd ane created executable

/etc/finalrd/sleep.finalrd

#!/bin/sh

set -x
if [ "$1" = "setup" ] then
    . /usr/share/initramfs-tools/hook-functions	
    copy_exec /usr/bin/sleep
    copy_exec /usr/bin/mount	

    exit 0
fi	

#your debug script
mount
sleep 30

i have second system with ubuntu and in this second system i do not have
nvidia drivers and i only created kill-plymouthd.service  and this also
work.

 and i did know why plymouthd is not killed befor umount root fs..

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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:
  Fix Released
Status in systemd package in Ubuntu:
  Fix Released
Status in systemd source package in Focal:
  Fix Released

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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