From mboxrd@z Thu Jan 1 00:00:00 1970 From: Alex Bligh Subject: Re: Fatal crash on xen4.2 HVM + qemu-xen dm + NFS Date: Tue, 22 Jan 2013 13:01:02 +0000 Message-ID: <97E604E8C55C38DAF75504B5@nimrod.local> References: <5B4525F296F6ABEB38B0E614@nimrod.local> <50CEFDA602000078000B0B11@nat28.tlf.novell.com> <3B1D0701EAEA6532CEA91EA0@Ximines.local> <77822E2DDAEA8F94631B6A52@Ximines.local> <1358781790.3279.224.camel@zakaz.uk.xensource.com> <1358783420.3279.235.camel@zakaz.uk.xensource.com> <1358787073.3279.257.camel@zakaz.uk.xensource.com> <19EA31DDC3BEF4D66B42CBAC@Ximines.local> <1358849227.3279.307.camel@zakaz.uk.xensource.com> Reply-To: Alex Bligh Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii"; Format="flowed" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <1358849227.3279.307.camel@zakaz.uk.xensource.com> Content-Disposition: inline List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xen.org Errors-To: xen-devel-bounces@lists.xen.org To: Ian Campbell Cc: Konrad Wilk , Xen Devel , Alex Bligh , Jan Beulich , Stefano Stabellini List-Id: xen-devel@lists.xenproject.org --On 22 January 2013 10:07:07 +0000 Ian Campbell wrote: > On Mon, 2013-01-21 at 20:37 +0000, Alex Bligh wrote: >> This would also explain why Ian might not have seen it (it went in >> late and without O_DIRECT we think this crash can't happen). > > When I saw this sort of thing it was with PV guests and blktap. I have > never tried anything like this with an HVM guest so it's not hard to > explain why I've never seen it there ;-). My knowledge of PV guests is about zero, but I thought they used xen_disk.c as well. However, as you were testing pre April 2012 I think, they wouldn't have used O_DIRECT. -- Alex Bligh