Re: Logging out and in again creates an every-increasing number of sessions

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On Thu, 2020-02-13 at 13:54 +0100, Iñaki Ucar wrote:
> On Thu, 13 Feb 2020 at 13:43, Patrick O'Callaghan <pocallaghan@xxxxxxxxx> wrote:
> > On Thu, 2020-02-13 at 13:15 +0100, Iñaki Ucar wrote:
> > > On Thu, 13 Feb 2020 at 11:56, Patrick O'Callaghan <pocallaghan@xxxxxxxxx> wrote:
> > > > On Thu, 2020-02-13 at 00:34 +0100, Iñaki Ucar wrote:
> > > > > This isn't a KDE thing, it's systemd. See e.g. [1] and [2].
> > > > > 
> > > > > [1] https://forum.xfce.org/viewtopic.php?id=12994
> > > > > [2] https://wiki.archlinux.org/index.php/Systemd/User#Kill_user_processes_on_logout
> > > > 
> > > > I know what causes it. My point is that the problem occurs with KDE and
> > > > other desktops, but not apparently with Gnome, so it would be
> > > > interesting to know why this is. Does systemd treat Gnome specially, or
> > > > does Gnome have some kind of built-in workaraound that avoids this
> > > > issue?
> > > 
> > > Are you sure that this doesn't happen with Gnome?
> > 
> > No, I'm simply relying on some comments in the above references.
> 
> AFAIK, it does happen in Gnome too, because that's entirely to systemd
> (unless gdm does something special nowadays). E.g.:
> https://bbs.archlinux.org/viewtopic.php?id=204307

OK. I guess I might try Gnome to see what happens.

> > > There was a change in systemd some years ago [1] to KillUSerProcesses
> > > by default, and if you follow the trail, this triggered lively debate.
> > > Particularly, we had [2] in Fedora, and there was even a change
> > > proposal [3] to follow the decision upstream, but it was first delayed
> > > and then never implemented [4]. Maybe Zbigniew (in CC), the owner,
> > > could tell us why.
> > 
> > I'll take a look at those, thanks.
> > 
> > > And maybe this topic could be resurrected in devel if there's renewed
> > > interest, but you are probably going to find opposition; because this
> > > is fine for multi-user workstations, but it breaks things in servers.
> > > IMHO, in a perfect world, each flavour (Workstation, Server, KDE...)
> > > should decide and explicitly set the default option.
> > 
> > Sounds like a good idea. I don't see why it should break things in
> > servers, but maybe that's clarified in the links you mention.
> 
> TL;DR: it kills processes when you log out. So if you ssh into the
> machine, launch something using tmux/screen/nohup, and then log out,
> these processes get killed. You have further details and discussion in
> the links provided (and in other forums in other distros if you take a
> look too).

Yes, I've skimmed them now and have an idea of the objections. What I
don't understand is 
https://fedoraproject.org/wiki/Changes/KillUserProcesses_by_default
which says that KillUserProcesses is now the default, when it clearly isn't. I did a fresh install of F31 a couple of months ago and that setting had not changed until I edited it myself.

poc
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