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Re: [Qemu-devel] qemu process stuck in Rl state


From: Stefan Hajnoczi
Subject: Re: [Qemu-devel] qemu process stuck in Rl state
Date: Thu, 18 Sep 2014 11:49:22 +0100
User-agent: Mutt/1.5.23 (2014-03-12)

On Wed, Sep 17, 2014 at 11:56:57PM +0400, Andrey Korolyov wrote:
> I`ve faced an issue with qemu VMs with very large uptime spans - half
> of year or so. They are hanging in running state forever and are not
> killable in any imaginable fashion. Tried to freeze it via freezer cg
> without any luck. VM itself went unresponsive with zero cpu
> consumption after reaching 'forever running' point.
> 
> I am going to reset the host in a couple of hours, so any timed ideas
> for debugging this state will be very appreciated.

A couple of shots at figuring out what the process is doing:

cat /proc/$PID/stack
cat /proc/$PID/syscall
gdb $PID
(gdb) thread apply all bt

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