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

[Keir Fraser <keir.xen@xxxxxxxxx>]

On 22/11/2011 17:36, "Olaf Hering" <olaf@xxxxxxxxx> wrote:

> On Tue, Nov 22, Keir Fraser wrote:
> 
>> I have a new theory, which is that if we go round the for-loop in
>> wait_event() more than once, the vcpu's pause counter gets messed up and
>> goes negative, condemning it to sleep forever.
> 
> I have added a check for that, its not negative.
>  
>> I have *just* pushed a change to the debug 'q' key (ignore the changeset
>> comment referring to 'd' key, I got that wrong!) which will print per-vcpu
>> and per-domain pause_count values. Please get the system stuck again, and
>> send the output from 'q' key with that new changeset (c/s 24178).
> 
> To me it looks like dom0 gets paused, perhaps due to some uneven pause/unpause
> calls.
> I will see if I can figure it out.

Could it have ended up on the waitqueue?

 -- Keir



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