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Re: [Xen-devel] Possible shadow bug

To: Pasi K?rkk?inen <pasik@xxxxxx>
Subject: Re: [Xen-devel] Possible shadow bug
From: Tim Deegan <Tim.Deegan@xxxxxxxxxx>
Date: Fri, 10 Jun 2011 13:40:34 +0100
Cc: xen-devel@xxxxxxxxxxxxxxxxxxx, Keir Fraser <keir@xxxxxxx>, Stabellini <stefano.stabellini@xxxxxxxxxxxxx>, "containers@xxxxxxxxxxxxxxxxxxxxxxxxxx" <containers@xxxxxxxxxxxxxxxxxxxxxxxxxx>, Li Zefan <lizf@xxxxxxxxxxxxxx>, "linux-kernel@xxxxxxxxxxxxxxx" <linux-kernel@xxxxxxxxxxxxxxx>, Michal Hocko <mhocko@xxxxxxx>, "linux-mm@xxxxxxxxx" <linux-mm@xxxxxxxxx>, Keir Fraser <keir.xen@xxxxxxxxx>, Igor Mammedov <imammedo@xxxxxxxxxx>, Paul Menage <menage@xxxxxxxxxx>, "balbir@xxxxxxxxxxxxxxxxxx" <balbir@xxxxxxxxxxxxxxxxxx>, "akpm@xxxxxxxxxxxxxxxxxxxx" <akpm@xxxxxxxxxxxxxxxxxxxx>, Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>, Hiroyuki Kamezawa <kamezawa.hiroyuki@xxxxxxxxx>
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At 14:48 +0300 on 10 Jun (1307717301), Pasi K?rkk?inen wrote:
> On Fri, Jun 10, 2011 at 11:10:11AM +0100, Tim Deegan wrote:
> > At 11:01 +0100 on 10 Jun (1307703699), Tim Deegan wrote:
> > > ISTR that even though the RHEL xen reports a 3.0.x version it has quite
> > > a lot of backports in it.  Does it have this patch?
> > > http://hg.uk.xensource.com/xen-3.1-testing.hg/rev/e8fca4c42d05
> > 
> > Oops, that URL doesn't work; I meant this:
> > http://xenbits.xen.org/xen-3.1-testing.hg/rev/e8fca4c42d05
> > 
> RHEL5 Xen (hypervisor) reports version as 3.1.2-xyz..

Based on a quick scrobble through the CentOS 5.6 SRPMs it looks like a
3.1.0 hypervisor with a bunch of extra patches, but not this one.  This
is very likely the cause of the crash in mem_cgroup_create(), and
probably the corruptions too.  That would explain why they didn't happen
on a 4.0.x SLES11 Xen, but not really why the original patch in this
thread made it go away.



Tim Deegan <Tim.Deegan@xxxxxxxxxx>
Principal Software Engineer, Xen Platform Team
Citrix Systems UK Ltd.  (Company #02937203, SL9 0BG)

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