Re: [Qemu-devel] [patch] Fix block I/O hang.

[Gerd Hoffmann <kraxel@redhat.com>]

Anthony Liguori wrote:
> Gerd Hoffmann wrote:
>>
>>>  However,
>>>
>>>    
>>>> Third, when called from a select callback it shouldn't block
>>>> indeed.  It
>>>> does though for me now and then when booting xen guests (with a big
>>>> stack of xenner patches).  Doesn't reproduce reliable though. 
>>>> Sprinkled
>>>> in a printk (with rfd being non-blocking) and got a EAGAIN once, so it
>>>> got called with rfd not having data.
>>>>       
>>> I think it would be good to root cause this.  AFAICT, it shouldn't
>>> block.
>>>     
>>
>> Yes, something is fishy here.  Will try to pin it.
>> Ideas where to look are welcome in case you have any ;)
>>   
> 
> Are you doing something funky with threads in xenner?

No, I don't create any.

cheers,
  Gerd