Re: [Xen-devel] [xen-4.1-testing test] 9805: regressions - FAIL

[Stefan Bader <stefan.bader@xxxxxxxxxxxxx>]

On 17.11.2011 11:13, Keir Fraser wrote:
> On 17/11/2011 09:57, "Stefan Bader" <stefan.bader@xxxxxxxxxxxxx> wrote:
> 
>>>> This is due to a bad backport of c/s 24007:0526644ad2a6: In -unstable,
>>>> evtchn_unmask() must be called with d->event_lock held, while in 4.1
>>>> the function acquires the lock (and now gets called with the lock already
>>>> held from do_physdev_op()'s case PHYSDEVOP_eoi). The change dates
>>>> back to 23573:584c2e5e03d9, which hardly is a candidate for backporting
>>>> (but maybe the locking change needs to be pulled out of there).
>>>
>>> Interestingly, Ubuntu's 4.1 fix has exactly the same problem.
>>>
>>
>> Hm, yes we should. I am pretty sure I hit that code path often enough, Wonder
>> why I never saw any dead lock there...
> 
> Perhaps your dom0 kernel doesn't register a pirq_eoi_map.
> 
Would be the only explanation. And quite possible. Heck, I would need to know
what that is used for anyway. :/ The kernel is 3.0 based the interrupt I was
looking at just was a normal apic emulated through events one...

-Stefan
>  -- Keir
> 
> 
> 
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