[systemd-devel] Requested transaction contradicts existing jobs: start is destructive

[Mark Bannister]

> On Tue, 5 May 2020 at 16:27, Mark Bannister <mbannister at janestreet.com> wrote:
> > Perhaps I'm missing something or oversimplifying, but I tried to
> > reproduce the problem as follows: I created a script that ignores INT,
> > TERM and HUP and then loops indefinitely writing the time every second
> > to a log file.  I SSHed into the box, ran the script, and then from
> > another terminal window killed the parent (bash) and also retried the
> > experiment by killing the bash parent (sshd).  In both cases the
> > parent bash and sshd processes died (as expected), my script kept
> > running but the parent PID of the script was changed to 1 (systemd).
> > I did not receive any error messages in /var/log/messages.
>
> It has to be the last remaining session of the user, and you should
> inspect with systemctl list-jobs if systemd is trying to stop the
> scope and slice units, just to be sure, before attempting to login.
> Otherwise, if you're logged in from two places on the machine for a
> user, you won't hit the issue, obviously.

I repeated the exact same test with a different user account, one
set-up specifically for this test and nothing else, so there was only
one SSH session.  But 'systemctl list-jobs' always reported 'No jobs
running' even after the SSH session was terminated.  My script kept
running with the parent PID of 1.  Thanks for your help so far, but I
have still been unable to reproduce the problem.  What am I doing
wrong?

Thanks
Mark