linux-kernel - Re: [dm-devel] [BUG] kernel 2.6.32.x hangs during boot process

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Date:	Fri, 29 Jan 2010 08:06:29 +0100
From:	François Figarola 
	<francois.figarola@...onsult.fr>
To:	Jun'ichi Nomura <j-nomura@...jp.nec.com>
CC:	hch@...radead.org, device-mapper development <dm-devel@...hat.com>,
	linux-kernel@...r.kernel.org, Neil Brown <neilb@...e.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-raid@...r.kernel.org, Al Viro <viro@...iv.linux.org.uk>
Subject: Re: [dm-devel] [BUG] kernel 2.6.32.x hangs during boot process

Jun'ichi Nomura a écrit :
>>> On Sat, 16 Jan 2010 10:58:30 +0100
>>> Fran__ois Figarola  <francois.figarola@...onsult.fr> wrote:
>>>       
>>>> Since I've tried to boot 2.6.32.x kernel, my system hangs during the
>>>> boot process, and I think it could be related to the problem reported
>>>> earlier by Megastorage (http://lkml.org/lkml/2010/1/10/92).
>>>>
>>>> The hardware is a Dell PowerEdge 2950 which runs fine with the
>>>> 2.6.31.x kernel series (actually running with the latest 2.6.31.11),
>>>> and the system is debian etch.
>>>>
>>>> Here is the trace of the bug I've got (using netconsole) with a
>>>> 2.6.32.3 kernel :
>>>>
>>>> BUG: Dentry ffff880667690000{i=41a46,n=sleep} still in use (8)
>>>> [unmount of ext3 dm-4]
>>>> ------------[ cut here ]------------
>>>> kernel BUG at fs/dcache.c:670!
>>>>         
>
> I can reproduce this when suspend/resume read-only mounted dm device.
>
> When MS_RDONLY, both freeze_bdev and thaw_bdev call deactivate_locked_super,
> which seems wrong. The change was introduced with the commit below:
>
>   commit 4504230a71566785a05d3e6b53fa1ee071b864eb
>   Author: Christoph Hellwig <hch@....de>
>   Date:   Mon Aug 3 23:28:35 2009 +0200
>
>   freeze_bdev: grab active reference to frozen superblocks
>
> With the attached patch, both remount-ro and remount-rw are
> rejected as EBUSY on freezed device as expected.
>
> Christoph, do you think this is the right fix?
>
>   
With the fix from Jun'ichi Nomura, a 2.6.32.5 kernel
boots now correctly.

Thanks.

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