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xen-devel
Re: [Xen-devel] [xen-4.1-testing test] 9805: regressions - FAIL
On Thu, 17 Nov 2011, Stefan Bader wrote:
> 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...
Same here, I don't have any dom0 kernels that support it.
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