From mboxrd@z Thu Jan  1 00:00:00 1970
From: Vincent Caron <vcaron@bearstech.com>
Subject: Bug#603632: [Xen-devel] PVops domain 0 crash on NUMA system only Node==1 present (Was: Re: Bug#603632: linux-image-2.6.32-5-xen-amd64:	Linux	kernel 2.6.32/xen/amd64 booting fine on bare metal,	but not as dom0 with Xen 4.0.1 (Dell R410))
Date: Fri, 03 Dec 2010 11:30:47 +0100
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Reply-To: Vincent Caron <vcaron@bearstech.com>, 603632@bugs.debian.org
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To: Ian Campbell <Ian.Campbell@eu.citrix.com>
Cc: Vincent CARON <zerodeux@zerodeux.net>, Cris Daniluk <cris.daniluk@gmail.com>, xen-devel <xen-devel@lists.xensource.com>, Keir Fraser <keir@xen.org>, Jeremy Fitzhardinge <jeremy@goop.org>, "603632@bugs.debian.org" <603632@bugs.debian.org>
List-Id: xen-devel@lists.xenproject.org

On Fri, 2010-12-03 at 08:51 +0000, Ian Campbell wrote:
> On Thu, 2010-12-02 at 23:47 +0000, Vincent Caron wrote:
> > On Tue, 2010-11-23 at 22:18 +0000, Ian Campbell wrote:
> > > On Tue, 2010-11-23 at 22:12 +0000, Ian Campbell wrote: 
> > > > On Tue, 2010-11-23 at 18:52 +0000, Ian Campbell wrote: 
> > > > > On Tue, 2010-11-23 at 11:51 +0000, Ian Campbell wrote:
> > > > > > 
> > > > > > Perhaps we should be passing numa_node_id() (e.g. current node)
> > > > > > instead of node 0? 
> > > > > 
> > > > > I've just kicked off a build of the 2.6.32-27 Debian kernel with the
> > > > > following additional patch, I will hopefully post the binaries tomorrow.
> > > > 
> > > > Build was quicker than I thought... Vincent, Cris if you get a chance
> > > > please can you test the kernel from:
> > > > http://xenbits.xen.org/people/ianc/2.6.32-27+numa1/
> > > 
> > > Also, please can you try adding "numa=noacpi" to your kernel command
> > > line when running with the standard Debian kernel (not the one above).
> > > 
> > > Thanks!
> > 
> >   It just happens that your kernel above (2.6.32-27+numa1) boots fine
> > under hypervisor _when_ passed 'numa=noacpi'. Yeah !
> > 
> >   I then tried again with Debian Squeeze's latest 2.6.32-28, which
> > crashes as -27 under hypervisor (and changelog show no xen or
> > numa-related thingies). Then I added 'numa=noacpi', and it boots fine
> > too. I got my 8 cores, networking, etc.
> > 
> >   Enclosed is the dmesg for the latter, Debian, kernel.
> > 
> >   Is the 'numa=noacpi' a "production acceptable" workaround ?
> 
> Yes and in fact I think the actual fix is simply to have Xen fake out
> the behaviour of numa=noacpi as below. I'll send this plus the other fix
> out after I've given it a bit of proper testing.

  OK, I'll follow the patch until it makes it to Squeeze's kernel.

  Thanks a lot for your help and fix !

  Now going to stress some Xen 4.0 domains...