linux-kernel - Re: ext3 on latest -git: BUG: unable to handle kernel NULL pointer dereference at 0000000c

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Date:	Thu, 17 Jul 2008 10:33:32 -0400
From:	Josef Bacik <jbacik@...hat.com>
To:	Vegard Nossum <vegard.nossum@...il.com>
Cc:	Josef Bacik <jbacik@...hat.com>,
	Josef Bacik <josef@...icpanda.com>, linux-ext4@...r.kernel.org,
	sct@...hat.com, akpm@...ux-foundation.org, adilger@....com,
	Johannes Weiner <hannes@...urebad.de>,
	linux-kernel@...r.kernel.org
Subject: Re: ext3 on latest -git: BUG: unable to handle kernel NULL pointer
	dereference at 0000000c

On Thu, Jul 17, 2008 at 04:44:47PM +0200, Vegard Nossum wrote:
> On Thu, Jul 17, 2008 at 4:16 PM, Josef Bacik <jbacik@...hat.com> wrote:
> > On Thu, Jul 17, 2008 at 04:35:16PM +0200, Vegard Nossum wrote:
> >> On Thu, Jul 17, 2008 at 4:13 PM, Josef Bacik <jbacik@...hat.com> wrote:
> >> > On Thu, Jul 17, 2008 at 04:25:49PM +0200, Vegard Nossum wrote:
> >> >> On Thu, Jul 17, 2008 at 3:57 PM, Josef Bacik <jbacik@...hat.com> wrote:
> >> >> > Can you try this patch out and see if it fixes the problem?  I didn't compile
> >> >> > test it, so you may need to tweak somethings, but it should work.  Thanks,
> >> >> >
> >> >> > Signed-off-by: Josef Bacik <jbacik@...hat.com>
> >> >>
> >> >> Nope, seems to be the same problem:
> >> >>
> >> >> kjournald starting.  Commit interval 5 seconds
> >> >> EXT3-fs warning: mounting fs with errors, running e2fsck is recommended
> >> >> EXT3 FS on loop0, internal journal
> >> >> EXT3-fs: mounted filesystem with ordered data mode.
> >> >> EXT3-fs error (device loop0): ext3_free_blocks: Freeing blocks in
> >> >> system zones - Block = 16, count = 1
> >> >> EXT3-fs error (device loop0): ext3_free_blocks: Freeing blocks in
> >> >> system zones - Block = 32, count = 1
> >> >> EXT3-fs error (device loop0): ext3_free_blocks: Freeing blocks not in
> >> >> datazone - block = 262144, count = 1
> >> >> BUG: unable to handle kernel NULL pointer dereference at 0000000c
> >> >> IP: [<c01fd210>] journal_dirty_metadata+0xa0/0x160
> >> >>
> >> >> Full log at http://folk.uio.no/vegardno/linux/log-1216304953.txt
> >> >>
> >> >>
> >> >
> >> > Ok, this should do it then.  Thanks,
> 
> -ENOLUCK
> 
> EXT3-fs error (device loop0): ext3_free_blocks: Freeing blocks not in
> datazone - block = 524288, count = 1
> EXT3-fs error (device loop0) in ext3_free_blocks_sb: IO failure
> BUG: unable to handle kernel NULL pointer dereference at 0000000c
> IP: [<c01fd200>] journal_dirty_metadata+0xa0/0x160
> 
> It did seem to get further, though.
> 
> http://folk.uio.no/vegardno/linux/log-1216306142.txt
>

Ok run dumpe2fs -h on your image and see if you have a line that says

Errors behavior:          Continue

if you do run tune2fs -e remount-ro and then do the mount.  That would explain
why you are still having panics even though we should be aborting the journal.
Thanks,

Josef 
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