From mboxrd@z Thu Jan  1 00:00:00 1970
From: James Bottomley <James.Bottomley@HansenPartnership.com>
Subject: Re: [Bug 35282] BUG() in 2.6.38.6
Date: Tue, 17 May 2011 23:55:02 +0400
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References: <bug-35282-11613@https.bugzilla.kernel.org/>
	 <201105171917.p4HJHUhx019356@demeter2.kernel.org>
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On Tue, 2011-05-17 at 19:17 +0000, bugzilla-daemon@bugzilla.kernel.org
wrote:
> https://bugzilla.kernel.org/show_bug.cgi?id=35282


> May 15 16:09:32 192.168.42.2 Call Trace:
> May 15 16:09:32 192.168.42.2 <IRQ>
> May 15 16:09:32 192.168.42.2
> May 15 16:09:32 192.168.42.2 [<ffffffff812160eb>] ? __blk_run_queue+0x24/0x7e
> May 15 16:09:32 192.168.42.2 [<ffffffff81216167>] ? blk_run_queue+0x22/0x34
> May 15 16:09:32 192.168.42.2 [<ffffffff812b2fde>] ? scsi_run_queue+0x2ce/0x36d
> May 15 16:09:32 192.168.42.2 [<ffffffff812b39ef>] ? scsi_next_command+0x2d/0x39
> May 15 16:09:32 192.168.42.2 [<ffffffff812b4289>] ?
> scsi_io_completion+0x1ca/0x3fd

This looks like it might be related to the queue guard in
__elv_next_request() again,  could you try this patch:

http://marc.info/?l=linux-scsi&m=130348673628282

Thanks,

James