Re: [Xen-devel] Need help with fixing the Xen waitqueue feature

[Keir Fraser <keir@xxxxxxx>]

On 22/11/2011 11:40, "Olaf Hering" <olaf@xxxxxxxxx> wrote:

> On Sat, Nov 12, Keir Fraser wrote:
> 
>> On 11/11/2011 22:56, "Olaf Hering" <olaf@xxxxxxxxx> wrote:
>> 
>> So you run with a single CPU, and with wait_event() in one location, and
>> that works for a while (actually doing full waitqueue work: executing wait()
>> and wake_up()), but then hangs? That's weird, but pretty interesting if I've
>> understood correctly.
> 
> Yes, thats what happens with single cpu in dom0 and domU.
> I have added some more debug. After the backtrace below I see one more
> call to check_wakeup_from_wait() for dom0, then the host hangs hard.

I think I checked before, but: also unresponsive to serial debug keys?

And dom0 isn't getting put on a waitqueue I assume? Since I guess dom0 is
doing the work to wake things from the waitqueue, that couldn't go well. :-)

>>> Also, the 3K stacksize is still too small, this path uses 3096.
>> 
>> I'll allocate a whole page for the stack then.
> 
> Thanks.

Forgot about it. Done now!

 -- Keir

> 
> Olaf



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