From mboxrd@z Thu Jan  1 00:00:00 1970
From: Keir Fraser <keir.xen@gmail.com>
Subject: Re: [xen-4.1-testing test] 9805: regressions - FAIL
Date: Thu, 17 Nov 2011 09:06:51 +0000
Message-ID: <CAEA7F2B.250F3%keir.xen@gmail.com>
References: <4EC4D4AE02000078000617B3@nat28.tlf.novell.com>
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To: Jan Beulich <JBeulich@suse.com>, Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Cc: xen-devel@lists.xensource.com, Ian Jackson <Ian.Jackson@eu.citrix.com>
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On 17/11/2011 08:32, "Jan Beulich" <JBeulich@suse.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.

I'll revert the patch until someone has time to actually implement and test
a working patch against our vanilla 4.1-testing tree.

 -- Keir