From mboxrd@z Thu Jan  1 00:00:00 1970
From: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Subject: Re: Re: Freeze with 2.6.32-5 and xen-4.0.2-rc1-pre Lockup
Date: Mon, 13 Dec 2010 11:55:19 -0500
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To: Mark Brown <mbrown@greenmountainservices.com>, Ian.Campbell@citrix.com
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On Thu, Dec 09, 2010 at 06:24:30PM -0800, Mark Brown wrote:
> 
> Here some more details on the lockup:
> 
> HW: Intel DQ45CB with E7100 CPU, 4GB RAM.
> 
> (XEN) Command line: console=com1 com1=115200,8n1 acpi=strict apic=debug
> [    0.000000] Command line: root=/dev/mapper/750GB-XEN ro console=hvc0
> xen-pciback.hide=(01:00.0)(01:01.0) acpi=strict
> 
> Crash looks like this:
> [ 9896.769906] BUG: soft lockup - CPU#0 stuck for 72s! [qemu-dm:17447]
.. snip ..
> [ 9896.769906] Pid: 17447, comm: qemu-dm Not tainted 2.6.32-5-xen-amd64 #1
> [ 9896.769906] RIP: 0033:[<00007f708082b968>]  [<00007f708082b968>]
> 0x7f708082b968
> [ 9896.769906] RSP: 002b:00007fff23d56f08  EFLAGS: 00000202
> [ 9896.769906] RAX: 0000000000000001 RBX: 0000000000c65a00 RCX:
> ffffffff810092eb
> [ 9896.769906] RDX: 0000000000000001 RSI: 0000000000000085 RDI:
> 0000000000ac43a4
> [ 9896.769906] RBP: 0000000000ca7200 R08: 0000000000ac43a0 R09:
> 0000000004000001

.. snip ..
> type=IO-APIC-level   status=00000010 in-flight=1 domain-list=0: 21(P-MM),
> (XEN)    IRQ:  22 affinity:00000000,00000000,00000000,00000001 vec:91

That looks quite suspect. Ian, this kernel - it wouldn't have your fix
for the memset?