Bug#946645: KillUserProcesses=no disregarded for some cgroups

[chrysn]

On Mon, Feb 10, 2020 at 03:04:49PM +0100, Ansgar wrote:
> If I start an xterm via Alt-F2 in gnome, the xterm process runs in a
> cgroup like gnome-launched-xterm-489694.scope.  gnome-terminal or an
> xterm started in gnome-terminal run in the gnome-terminal-
> server.service cgroup.  I expect openbox doesn't do this and processes
> started by openbox run in the same cgroup as openbox itself.
> 
> `systemd-cgls` is useful to see how processes are organized into
> cgroups.
> 
> The gnome-launched-*.scope has KillMode=control-group, so all processes
> including background processes like tmux get killed when the unit gets
> stopped (systemd --user show -p KillMode gnome-launched-....scope).

That does not explain the on-and-off behavior, but helps in
understanding why processes get killed in the first place.

Then, however, is KillUserProcesses completely obsolete? A user trying
to debug a situation like mine will currently wind up in the discussion
of #825394 and look into KillUserProcesses' documentation. Even if it's
not completely obsolete, a warning that desktop environment spawned
processes might also be subject to killing from their desktop
environment's KillMode would be helpful.

Kind regards
chrysn
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