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Re: [Qemu-devel] [patch] Fix block I/O hang.
From: |
Gerd Hoffmann |
Subject: |
Re: [Qemu-devel] [patch] Fix block I/O hang. |
Date: |
Tue, 11 Nov 2008 22:34:19 +0100 |
User-agent: |
Thunderbird 2.0.0.16 (X11/20080723) |
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
Re: [Qemu-devel] [patch] Fix block I/O hang., Gerd Hoffmann, 2008/11/12