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Re: [Xen-devel] domU and dom0 hung with Xen console interrupt binding sh

To: Keir Fraser <keir.fraser@xxxxxxxxxxxxx>
Subject: Re: [Xen-devel] domU and dom0 hung with Xen console interrupt binding showing in-flight=1, (---M)
From: Bruce Edge <bruce.edge@xxxxxxxxx>
Date: Fri, 20 Aug 2010 16:25:06 -0700
Cc: Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>, Jan Beulich <JBeulich@xxxxxxxxxx>
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On Thu, Aug 19, 2010 at 8:48 AM, Keir Fraser <keir.fraser@xxxxxxxxxxxxx> wrote:
On 19/08/2010 14:42, "Bruce Edge" <bruce.edge@xxxxxxxxx> wrote:

> Is there any more information that I can provide that would be helpful in
> diagnosing the direct cause and the appropriate fix?
> Possibly adding instrumentation or trace code to detect the trigger
> conditions?
> This is very repeatable on our target systems after a few hours of load.

You can try the attached Xen patch which should clear out the in-flight
interrupt after a short timeout. It might kick things back into action, and
is probably a fix we should have in the tree anyhow.

 -- Keir

Thanks Kier, this patch definitely works.

It's running on 2 machines under load, well past where they consistently have failed in the past.


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