Re: [Qemu-devel] QEMU refusing to die on FreeBSD host

[Juergen Lock]

In article <address@hidden> you write:
>Juergen Lock wrote:
>> On Sun, Apr 06, 2008 at 12:55:39AM -0400, Jake Myers wrote:
>>   
>>> Hello,
>>>
>>> On FreeBSD 7-STABLE, qemu refuses to exit even after the window is closed. 
>>> It is stuck so badly that even kill -9 fails to stop it. I looked in top to 
>>> see what it was doing that would cause it to lock so badly:
>>>
>>> PID USERNAME    THR PRI NICE   SIZE    RES STATE    TIME   WCPU COMMAND
>>> 34859 root          1  -8   20   433M   416M devdrn   9:49  0.00% qemu
>>>
>>> I believe the problem is that qemu for some reason refuses to stop trying 
>>> to use the kqemu device.
>>>
>>> I am running the latest qemu (0.9.1). I can provide a backtrace on request 
>>> (I'm really busy right now with other things, so I didn't have time to 
>>> attach one).
>>>     
>>
>> Yeah this looks like its the same FreeBSD 7.x/SMP issue that I already
>> got reports of (refcount problem, similar to what has already been fixed
>> once, only this time it seems to be a race...)
>>
>>  If it is, you should be able to work around it by using an uniprocessor
>> host kernel until a fix is known.
>>
>>  Sorry...
>>      Juergen
>>
>>
>>
>>   
>I disabled SMP in my kernel, rebuilt the kqemu module, and tried to run 
>it again. The same issue occurs.

Hmm okay, then its not an SMP issue, thanks for the information!
I guess then you can only do what Warner Losh suggested for the moment,
leave the hanging process(es) until reboot...  (You should at least be
able to run qemu again from another terminal, maybe use screen for this.)

 Sorry again...
        Juergen