Re: SysV shutdown hanging

[Thomas Schwinge]

Hi Justus!

On Fri, 12 Sep 2014 21:06:30 +0200, Justus Winter 
<4winter@informatik.uni-hamburg.de> wrote:
> Quoting Thomas Schwinge (2014-09-12 09:16:32)
> > In my QEMU Debian GNU/Hurd instance, I do some stuff (GDB testsuite, for
> > example), and then issue a »sudo shutdown -r now«.  This doesn't
> > complete, but hangs like this:
> > 
> >       PID  UID  PPID  PGrp  Sess TH  Vmem   RSS %CPU     User   System Args
> >     [...]
> >     28386    0     1 28386 28386  2  147M 1.67M  0.0  0:00.00  0:00.01 
> > /bin/sh /etc/init.d/rc 6
> >     28391    0 28386 28386 28386  2  146M 1000K  0.0  0:00.01  0:00.00 
> > /lib/startpar/startpar -p 4 -t 20 -T 3 -M stop -P 2 -R 6
> >     28413    0 28391 28386 28386  2  147M 1.72M  0.0  0:00.00  0:00.00 
> > /bin/sh /etc/init.d/sendsigs stop
> >     28418    0 28413 28386 28386  2  146M  668K  0.0  0:00.00  0:00.00 sync
> >     [...]
> > 
> > The sync is hanging; confirmed with a manually run »syncfs -s« which also
> > hangs.
> 
> Right, I also see this.
> 
> >  What seems suspicious is the following:
> > 
> >       814    0     5     1     1 15  141M  984K 99.8  0:00.23 11:47.19 
> > /hurd/console
> > 
> > ..., and indeed if I »kill -KILL« that one, some time later (?), the
> > shutdown proceeds.
> 
> My /hurd/console isn't chewing CPU time, though I see the kernel
> complaining about it deallocating an invalid port.  I'll see if I can
> track this down.

Yes, I've also seen that one.

> I see however some process crashing, and the crash server failing
> hard: [...]

> Curious, does your /servers/crash point to crash-dump-core as well?

Nope; that system is set to use crash-kill.

> Killing the crash server I managed to get my shutdown process going
> again, though it got stuck again.  Using the kernel debugger (at this
> point, sysvinit succesfully killed all my shells) I could see that
> indeed another crash server has been spawned.

I killed all crash servers (the three variants), but that didn't have any
effect; killing the CPU time eating console process however, the shutdown
proceeded.


Grüße,
 Thomas

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