Bug#1008725: systemd-logind option KillUserProcesses=true kills mount.davfs of user mount units

[Michael Biebl]

Am 31.03.22 um 11:21 schrieb Andreas Feldner:
> Package: systemd
> Version: 250.4-1
> Severity: normal
> 
> Dear Maintainer,
> 
> I activated KillUserProcesses=true for systemd-logind by creating a file
> /etc/systemd/logind.conf.d/99-killuserprocs.conf with the content below.
> 
> Some users have user session mounts configured by a unit file
> ~/.config/systemd/user/home-user-some-path.mount with the content similar to below.
> 
> This leads to all stale user process being killed after logout, which
> was basically the intention.
> 
> However, the user mount of type davfs also spawns a user process /sbin/mount.davfs
> each. Apparently, these processes get killed as well before a proper unmount of the
> user mounts. This leads to stale mount points and stale PID files requiring manual
> removal by the user before the directory can be mounted again.
> 
> I would have expected that processes spawned by the mount unit file do not get killed
> by the logind session but are handled with the life cycle of the mount unit.


I'd say what you see is expected behaviour. KillUserProcesses= is a 
blunt tool and simply kills all processes that are left-overs after a 
logout.
Tbh, this feels like a bug in davfs. It should properly release its 
resources when being killed.
That said, since Debian does not ship any custom patches in that regard, 
it's best if you raise this directly upstream at
https://github.com/systemd/systemd/issues

Regards,
Michael
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