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pdflush panic under I/O

Hello All,

Can anyone point me towards someone to help diagnose an issue I have with 
a pure64 box panicing when it comes under load? I am running 2.6.8-rc1 
with pure64/unstable (as of two days ago or so, but its been the same 
for the last few weeks so I don't think userspace is the issue). I have 
LVM2 partitions with XFS on top of it. I have MySQL sitting on top again, 
and each time I do a mysqldump I get the following, repeatable, panic:

CS:  0010 DS:: 0018 ES: 0018 CR0: 000000008005003b
CR2: 000000000005fe008 CR3: 00000000000101000 CR4: 00000000000000006e0
Process pdflush *pid: 44, threadinfo 0000010008132000, task 0000010008131170)
Stack: 0000010008133cb8 00000101fc1072f0 0000010008133e48 ffffffff8015dc0a
       0000000000000001 ffffffff801969ff 0000000000000000 ffffffffa0101980
       0000000000000000 00000101ffe3a308
Call Trace: <ffffffff8015dc0a>{pagevec_lookup_tag+26} <ffffffff801969ff>{mpage_writepages+623}
<ffffffffa0101980{:xfs:linvfs_writepage+0} <ffffffffa00e52b8>{:xfs:xfsflush+744}
<ffffffff8019501f>{__sync_single_inode+111} <ffffffff8019546f>{sync_sb_inodes+495}
<ffffffff801955d4>{writeback_inodes+132} <fffffffff801586fc>{wb_kupdate+2}
<ffffffff801592a0>{pdflush+0} <ffffffff801591e9>{__pdflush+297}
<ffffffff801592bc>{pdflush+28} <ffffffff80158650>{wb_kupdate+0}
<ffffffff8014a002>{kthread+146} <ffffffff80111447>{child_rip+8}
<ffffffff801592a0>{pdflush+0} <ffffffff8014a040>{keventd_create_kthread}
<ffffffff80149f70>{kthread+0} <ffffffff8011143f>{child_rip+0}
Code: 7e f8 e9 f5 da ff ff e8 ba 55 15 00 e9 c4 fb ff ff e8 5e 56
consoel shuts up ...

Can anyone here grok this, and tell me if I should be talking to 
maintainers for LVM, XFS, or someone completely different? Has anyone 
else had issues with pure64 and 2.6 kernels when doing large I/O?

If anyone is interested, I can send kernel config and any other relevant

Many thanks,
(Hardware: IBM xSeries 325, 8GB RAM, 2 * qLogic HBAs)
 James Bromberger <james_AT_rcpt.to> www.james.rcpt.to
 Remainder moved to http://www.james.rcpt.to/james/sig.html

I am in London on UK mobile +44 7952 042920.

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