This is an archived copy of the Xen.org mailing list, which we have preserved to ensure that existing links to archives are not broken. The live archive, which contains the latest emails, can be found at http://lists.xen.org/
Home Products Support Community News


Re: [Xen-users] Xen system hang or freeze

To: xen-users@xxxxxxxxxxxxxxxxxxx
Subject: Re: [Xen-users] Xen system hang or freeze
From: Martin Fernau <m.fernau@xxxxxxxxxx>
Date: Tue, 5 May 2009 08:42:34 +0200
Cc: Nick Anderson <nick@xxxxxxxxxxxx>
Delivery-date: Mon, 04 May 2009 23:43:05 -0700
Envelope-to: www-data@xxxxxxxxxxxxxxxxxxx
In-reply-to: <20090424024517.GB23066@tp>
List-help: <mailto:xen-users-request@lists.xensource.com?subject=help>
List-id: Xen user discussion <xen-users.lists.xensource.com>
List-post: <mailto:xen-users@lists.xensource.com>
List-subscribe: <http://lists.xensource.com/mailman/listinfo/xen-users>, <mailto:xen-users-request@lists.xensource.com?subject=subscribe>
List-unsubscribe: <http://lists.xensource.com/mailman/listinfo/xen-users>, <mailto:xen-users-request@lists.xensource.com?subject=unsubscribe>
Organization: CPS Entwicklungsgesellschaft mbH
References: <33b90e520904030756l3d2e2eb5s1b7e50535a9a44c7@xxxxxxxxxxxxxx> <73806051-EEF0-484E-BBC0-D24F0EFD5732@xxxxxxx> <20090424024517.GB23066@tp>
Sender: xen-users-bounces@xxxxxxxxxxxxxxxxxxx
User-agent: KMail/1.9.10

did you find out anything helpful about this problem?
I just had this freeze this morning again. Server freezed and no guests 
working any more. After 5 weeks of normal running. It seems that this is my 
intervall of this problem.

I really appreciated anything helpful about this! I'm totally stuck with this 


Am Freitag, 24. April 2009 schrieb Nick Anderson:
> On Thu, Apr 23, 2009 at 10:01:02PM -0400, Peter Booth wrote:
> > Nick,
> > When you got the "soft lockup" errors were they always with CPU0?
> Yes I believe so. But since I updated to the latest debian patched
> kernel I havent seen that soft lockup error.
> > Do you have any nesting in your LVM definitions?
> No
> > Is dom0 making use of LVM?
> No it is not.
> > Does the host have a wireless card?
> No
> > What graphics card does it have?
> Just the onboard graphics 01:05.0 VGA compatible controller: ATI
> Technologies Inc ES1000 (rev 02)
> > There is a Xen 2.6.18 kernel bug that might be related to what you see,
> > as well as a patch:
> > http://www.mail-archive.com/debian-kernel@xxxxxxxxxxxxxxxx/msg40893.html
> Yes I think that patch is in the latest kernel update which made the
> soft lockup messages go away. Odly everyone else that noted the soft
> lockup errors only noted them as an annoyance. I don't recall ever
> seeing anyone link the messages with any actual undesirable behavior
> outside of the msgs themselves.
> > I appreciate that this freezing occurs when the system is quiet, but it
> > seems as if the hypervisor CPU scheduler might play some part in this,
> > such that the guest vcpus don't get scheduled on a pcpu. If it were me I
> > would try limiting dom0 to four vcpus - not as a long-term
> > configuration, but to see whether the problem recurred when we know that
> > each domU should have an available CPU.
> I was considering that. I also thought it interesting that each of the
> domUs are running on vcpu0. I figured they would automatically
> distribute to a free vcpu.

Mit freundlichem Gruß,
Martin Fernau

CPS Entwicklungsgesellschaft für EDV-Lösungen mbH
Gartenstraße 42 - 37269 Eschwege

Telefon (0 56 51) 95 99-0
Telefax (0 56 51) 95 99-90

eMail m.fernau@xxxxxxxxxx
Internet http://www.cps-net.de

Handelsregister Eschwege, HRB 1585
Geschäftsführer, Wilfried Fernau
Steuernummer 026 230 40308
USt-ID-Nr. DE 178 554 522

Xen-users mailing list

<Prev in Thread] Current Thread [Next in Thread>