[Testing Update] 2022-02-09 - Kernels, Haskell, Cutefish 0.7, Deepin, Firefox, Maui 2.1.1, Systemd

[DAC324]

@omano

@DAC324

Failed to unmount /oldroot

This is random error because of Nvidia driver (apparently it never does that without Nvidia driver installed). There is no solution, sometimes it does that on reboot/shutdown, sometimes it doesn’t, completely random with no workaround (you could read many attempts with “solutions” but in reality there is no solution to my knowledge).

Thanks a lot for pointing me in the right direction

Indeed, there appears to be a solution provided by Jonas Malhaco Filho here FS#63697 : [systemd] 243.0-1 poweroff/reboot umount errors

the issue does appear to be caused by the nvidia modules: unloading them with a /usr/lib/systemd/system-shutdown/* script does prevent it

So what does that mean?
Create a script with the following contents

#!/bin/sh
# Remove all Nvidia modules on shutdown
# to avoid errors like
# [35509.312925] sd-umoun[56020]: Failed to unmount /oldroot: Device or resource busy
# [35509.317505] sd-umoun[56021]: Failed to unmount /oldroot/sys: Device or resource busy
# [35509.322349] shutdown[1]: Failed to finalize file systems, ignoring.
#
for MODULE in nvidia_drm nvidia_modeset nvidia_uvm nvidia
do
rmmod $MODULE
done

Name this script, for example, nvidia.shutdown, make it executable as usual and place it in /usr/lib/systemd/system-shutdown.

Another version of this script was provided by Ivan Layapunov: FS#63697 : [systemd] 243.0-1 poweroff/reboot umount errors

Done. Error messages gone