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

[Anthony Liguori]

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?

Regards,

Anthony Liguori

> cheers,
>   Gerd
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