From mboxrd@z Thu Jan  1 00:00:00 1970
From: Andrew Cooper <andrew.cooper3@citrix.com>
Subject: Re: Xen 4.4 development update: Feature freeze has
	started
Date: Fri, 15 Nov 2013 14:48:33 +0000
Message-ID: <52863441.1080907@citrix.com>
References: <CAFLBxZZ=3WdJtMROacABo5rjgG0AWcJ+NBYjJaKMoTxFOa78hg@mail.gmail.com>
	<528114C6.8080505@citrix.com> <5286316E.9070609@eu.citrix.com>
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To: George Dunlap <george.dunlap@eu.citrix.com>
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On 15/11/13 14:36, George Dunlap wrote:
> On 11/11/13 17:32, Andrew Cooper wrote:
>> * HPET interrupt stack overflow (when using hpet_broadcast mode and MSI
>> capable HPETs)
>>    status: patches posted, undergoing review iteration.
>
> Is this a bug?
>
>  -George

Yes - it causes a double fault in debug builds of Xen.

In non-debug builds, Xen will survive, but the underlying cause is that
interrupts can erroneously stack with lower priority on top of higher
priority.

The patches have been Reviewed-by Tim, and are currently in XenServer
trunk having a good trashing across all our hardware.

~Andrew