linux-kernel - Re: [Xen-devel] Possible shadow bug

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Message-ID: <20110610124034.GI5098@whitby.uk.xensource.com>
Date:	Fri, 10 Jun 2011 13:40:34 +0100
From:	Tim Deegan <Tim.Deegan@...rix.com>
To:	Pasi K?rkk?inen <pasik@....fi>
CC:	<xen-devel@...ts.xensource.com>, Keir Fraser <keir@....org>,
	Stabellini <stefano.stabellini@...citrix.com>,
	"containers@...ts.linux-foundation.org" 
	<containers@...ts.linux-foundation.org>,
	Li Zefan <lizf@...fujitsu.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Michal Hocko <mhocko@...e.cz>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	Keir Fraser <keir.xen@...il.com>,
	Igor Mammedov <imammedo@...hat.com>,
	Paul Menage <menage@...gle.com>,
	Hiroyuki Kamezawa <kamezawa.hiroyuki@...il.com>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	"balbir@...ux.vnet.ibm.com" <balbir@...ux.vnet.ibm.com>
Subject: Re: [Xen-devel] Possible shadow bug

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.

Cheers,

Tim.

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