Need help debugging shutdown issues

[Nikolaus Rath]

On 11/06/2014 07:15 PM, Michael Biebl wrote:
> Am 07.11.2014 um 02:32 schrieb Nikolaus Rath:
>> Michael Biebl <biebl-8fiUuRrzOP0dnm+yROfE0A at public.gmane.org> writes:
> 
> 
>>> Try running "systemctl stop networking.service" before you
>>> shutdown/reboot. This service seems to be hanging in "ifdown -a".
>>> Might be dhclient or ifdown.d hook script causing a dead lock.
>>
>> I tried that, but it still hangs. 
> 
> Ok, please include, again, the output of systemctl status, list-jobs
> and ps aux from the debug shell so we see which job systemd is blocking
> on and which processes are running.

Well, that's the problem. If I'm able to access the debug shell, then
the system reboots fine. If the reboot is frozen, I don't seem to be
able to switch to tty9 anymore either.

I also tried running an sshd process in the debug shell (to see if I can
still reach the system remotely when it hangs), but the connection got
closed when I ran the systemctl command - why might that be? I had hoped
that processes spawned from the debug-shell would not get killed?

(I first stopped the regular ssh server and networking using systemctl,
then manually brought up networking in the debug shell as well).

Best,
-Nikolaus

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