bug#26931: GuixSD rebooting fails when tmux is running

[Leo Famulari]

On Sun, May 14, 2017 at 11:36:17PM +0200, Ludovic Courtès wrote:
> What does /var/log/shepherd.log show around the time where you hit
> “halt”?
> 
> I get something like this:
> 
> --8<---------------cut here---------------start------------->8---
> 18:06:26 Service mcron has been stopped.
> 18:06:26 sending all processes the TERM signal

For me, this is where it gets stuck:

------
2017-05-16 19:12:53 sending all processes the TERM signal
2017-05-16 19:12:58 waiting for process termination (processes left: (1 494)) 
2017-05-16 19:13:00 waiting for process termination (processes left: (1 494)) 
2017-05-16 19:13:02 waiting for process termination (processes left: (1 494)) 
------

In my experience, it will wait here forever.

And from `ps aux`:

leo        494  0.0  0.1  27232  3676 ?        Ss   19:12   0:00 tmux

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