From mboxrd@z Thu Jan  1 00:00:00 1970
From: Keir Fraser <keir@xen.org>
Subject: Re: [xen-4.1-testing test] 9805: regressions - FAIL
Date: Thu, 17 Nov 2011 10:13:10 +0000
Message-ID: <CAEA8EB6.343DD%keir@xen.org>
References: <4EC4DA9C.60600@canonical.com>
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To: Stefan Bader <stefan.bader@canonical.com>
Cc: xen-devel@lists.xensource.com, Ian Jackson <Ian.Jackson@eu.citrix.com>, Jan Beulich <JBeulich@suse.com>, Stefano Stabellini <Stefano.Stabellini@eu.citrix.com>
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On 17/11/2011 09:57, "Stefan Bader" <stefan.bader@canonical.com> 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.

 -- Keir