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Re: [Xen-devel] Re: 2.6.37-rc1 mainline domU - BUG: unable to handle ker

To: Boris Derzhavets <bderzhavets@xxxxxxxxx>
Subject: Re: [Xen-devel] Re: 2.6.37-rc1 mainline domU - BUG: unable to handle kernel paging request
From: Sander Eikelenboom <linux@xxxxxxxxxxxxxx>
Date: Sun, 14 Nov 2010 17:56:48 +0100
Cc: Jeremy Fitzhardinge <jeremy@xxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxx, Bruce Edge <bruce.edge@xxxxxxxxx>, Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
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Hmmm have you tried do do a lot of I/O with something else as NFS ?
That would perhaps pinpoint it to NFS doing something not completely compatible 
with Xen.

I'm not using NFS (I still use file: based guests, and i use glusterfs (fuse 
based userspace cluster fs) to share diskspace to domU's via ethernet).
I tried NFS in the past, but had some troubles setting it up, and even more 
problems with disconnects.

I haven't seen any "unable to handle page request" problems with my mix of 
guest kernels, which includes some 2.6.37-rc1 kernels.



Sunday, November 14, 2010, 5:37:59 PM, you wrote:

> I've tested F14 DomU (kernel vmlinuz-2.6.37-0.1.rc1.git8.xendom0.fc14.x86_64) 
> as NFS client and Xen 4.0.1 F14 Dom0 (kernel 
> vmlinuz- as NFS server . Copied 700 MB ISO 
> images from NFS folder at Dom0 to DomU and scp'ed them back to Dom0. During 
> about 30 - 40 min DomU ran pretty stable , regardless kernel crash as "unable 
> to handle page request" was reported once by F14 DomU, but it didn't actually 
> crash DomU. Same excersises with replacement F14 by Ubuntu 10.04 Server 
> results DomU crash in about several minutes. Dom0's instances dual boot on 
> same development box ( Q9500,ASUS P5Q3,8GB)

> Boris.

> --- On Fri, 11/12/10, Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx> wrote:

> From: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
> Subject: Re: [Xen-devel] Re: 2.6.37-rc1 mainline domU - BUG: unable to handle 
> kernel paging request
> To: "Sander Eikelenboom" <linux@xxxxxxxxxxxxxx>
> Cc: "Boris Derzhavets" <bderzhavets@xxxxxxxxx>, 
> xen-devel@xxxxxxxxxxxxxxxxxxx, "Bruce Edge" <bruce.edge@xxxxxxxxx>, "Jeremy 
> Fitzhardinge" <jeremy@xxxxxxxx>
> Date: Friday, November 12, 2010, 12:01 PM

> On Fri, Nov 12, 2010 at 05:27:43PM +0100, Sander Eikelenboom wrote:
>> Hi Bruce,
>> Perhaps handpick some kernels before and after the pulls of the xen patches 
>> (pv-on-hvm etc) to begin with ?
>> When you let git choose, especially with rc-1 kernels, you will end up with 
>> kernels in between patch series, resulting in panics.

> Well, just the bare-bone boot of PV guests with nothing fancy ought to work.

> But that is the theory and ..
>> > The git bisecting is slow going. I've never tried that before and I'm a git
>> > rookie.
>> > I picked 2.6.36 - 2.6.37-rc1 as the bisect range and my first 2 bisects all
>> > panic at boot so I'm obviously doing something wrong.
>> > I'll RTFM a bit more and keep at it.

> .. as Bruce experiences this is not the case. Hmm..

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Best regards,
 Sander                            mailto:linux@xxxxxxxxxxxxxx

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