Today i've built vmlinuz-2.6.37-0.1.rc1.git8.xendom0.fc14.x86_64
via Michael's http://koji.fedoraproject.org/koji/taskinfo?taskID=2598434
and uncommented xen.pcifront.fixes.patch in kernel.spec, i.e.

# Xen patches
ApplyPatch xen.next-2.6.37.patch
# ApplyPatch xen.upstream.core.patch
ApplyPatch xen.pcifront.fixes.patch
# ApplyPatch xen.pvhvm.fixes.patch

as a result i got a kernel wich runs pretty stable NFS client at Xen 4.0.1 
F14 Dom0 (2.6.32.25-172.xendom0.fc14.x86_64).
  
  I was able several times copied from NFS folder F14's ISO image (3.2 GB) 
to DomU and scp'ed it back and didn't get any kernel crashing on DomU.
 On Ubuntu 10.04 this kernel may be built as rc1&git8 patched via
xen.next-2.6.37.patch
xen.pcifront.fixes.patch
All required upstream patches may be taken (as well as 2 above)
from link http://koji.fedoraproject.org/koji/taskinfo?taskID=2598434
  I believe as soon as xen.pcifront.fixes.patch will be accepted by upstream
NFS client issue on F14 will be gone 

Boris.

--- On Mon, 11/15/10, Boris Derzhavets <bderzhav...@yahoo.com> wrote:

From: Boris Derzhavets <bderzhav...@yahoo.com>
Subject: Re: [Fedora-xen] 2.6.37-rc1 dom0 kernel
To: "M A Young" <m.a.yo...@durham.ac.uk>
Cc: xen@lists.fedoraproject.org
Date: Monday, November 15, 2010, 1:13 PM

I've tested the most recent kernel from Michael Young
http://koji.fedoraproject.org/koji/taskinfo?taskID=2598434
  kernel vmlinuz-2.6.37-0.1.rc1.git8.xendom0.fc14.x86_64(rc1.git8 + 
xen-next.patch)  
as Dom0 kernel under Xen 4.0.1 on top of F14.
Attempt to work with NFS remote folder results kernel crash again
- unable to handle paging request and stack trace.

Kernel works OK only as vanilla.

Boris.
P.S. Same issue is in place for PV DomU running  
kernel vmlinuz-2.6.37-0.1.rc1.git8.xendom0.fc14.x86_64




      
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