linux-kernel - Re: [dm-devel] Block regression since 3.1-rc3

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Message-ID: <x49pqicnapu.fsf@segfault.boston.devel.redhat.com>
Date:	Tue, 04 Oct 2011 09:32:45 -0400
From:	Jeff Moyer <jmoyer@...hat.com>
To:	Christophe Saout <christophe@...ut.de>
Cc:	device-mapper development <dm-devel@...hat.com>,
	linux-kernel@...r.kernel.org, Jens Axboe <axboe@...nel.dk>
Subject: Re: [dm-devel] Block regression since 3.1-rc3

Christophe Saout <christophe@...ut.de> writes:

> Hi Jeff,
>
>> Anyway, it would help a great deal if you could retrigger the failure
>> and provide the full failure output.  You can get that by issuing the
>> 'dmesg' command and redirecting it to a file.
>
> Oh, sorry, yes, there's a line missing.
>
> Line 323 is this one: BUG_ON(!rq->bio || rq->bio != rq->biotail);
>
> The bug is not specific to GFS2, I also get it when using an ext3 mount
> on that multipath storage pool when writing to a file.

Great, thanks!  I tried ext3 and ext4 as well, and was unable to trigger
this problem.  I setup a linear volume on top of a multipath device.  Is
that the configuration you are using?  Anyway, this may be enough to get
me on the right path...

Cheers,
Jeff
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