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Re: [Xen-devel] [Bug 1759] Xen 4.0.1 live migration/restore over-writes

To: Keir Fraser <keir.xen@xxxxxxxxx>
Subject: Re: [Xen-devel] [Bug 1759] Xen 4.0.1 live migration/restore over-writes new hypervisor's boot-time record
From: Ian Campbell <Ian.Campbell@xxxxxxxxxx>
Date: Thu, 14 Apr 2011 07:40:08 +0100
Cc: Tim M <bugs@xxxxxxxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>
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On Wed, 2011-04-13 at 21:00 +0100, Keir Fraser wrote:
> On 13/04/2011 20:31, "Tim M" <bugs@xxxxxxxxxxxxxx> wrote:

> > I have only tried Ubuntu 10.04.2 guests running the 2.6.32 and 2.6.35 server
> > kernel packages but, as mentioned, this happens every time.
> I think this is a domU kernel bug, see a similar report here for example:
> http://lists.xensource.com/archives/html/xen-devel/2010-10/msg00057.html
> So it could be a common symptom in a range of Debian/Ubuntu kernels.

This issue was introduced in one of the upstream longterm 2.6.32.y
kernels (by 1345126c761f in v2.6.32.16, I think). It was fixed upstream
in e7a3481c0246 "x86/pvclock: Zero last_value on resume" from
v2.6.37-rc6 which was added to the longterm 2.6.32.x branch as
595b62a8acfb in v2.6.32.30. It appears to have also gone into longterm
v2.6.35.12 as ac9a0f1a28f5.

This issue is fixed in the 2.6.32-31 package currently in Debian stable.

I can't speak for Ubuntu. You should contact them.


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