linux-kernel - Re: [BUG] raid1 behind writes alter bio structure illegally

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Date:	Wed, 29 Jul 2009 16:18:46 -0400
From:	Paul Clements <paul.clements@...eleye.com>
To:	Milan Broz <mbroz@...hat.com>
CC:	linux-raid@...r.kernel.org, Neil Brown <neilb@...e.de>,
	kernel list <linux-kernel@...r.kernel.org>,
	ian.campbell@...rix.com
Subject: Re: [BUG] raid1 behind writes alter bio structure illegally

Milan Broz wrote:
> Hi Paul,
> 
> Paul Clements wrote:
>> I've run into this bug on a 2.6.18 kernel, but I think the fix is still 
>> applicable to the latest kernels (even though the symptoms would be 
>> slightly different).
>>
>> Perhaps someone who knows the block and/or SCSI layers well can comment 
>> on the legality of attaching new pages to a bio without fixing up the 
>> internal bio counters (details below)?
> 
>> LVM over raid1 over SCSI/nbd
> 
> Please can you try that backporting of this patch helps?
> 
> http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=5d84070ee0a433620c57e85dac7f82faaec5fbb3
> 
> (If so, see https://bugzilla.redhat.com/show_bug.cgi?id=512387)

Thanks Milan. I tested the patch and it does fix the issue. I replied to 
the bugzilla report with this information.

--
Paul
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