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

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Message-ID: <19f34abd0807170620g39ab942bl592ea3fa3fa0dab@mail.gmail.com>
Date:	Thu, 17 Jul 2008 15:20:47 +0200
From:	"Vegard Nossum" <vegard.nossum@...il.com>
To:	"Josef Bacik" <josef@...icpanda.com>
Cc:	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 3:13 PM, Josef Bacik <josef@...icpanda.com> wrote:
> On Thu, Jul 17, 2008 at 8:51 AM, Vegard Nossum <vegard.nossum@...il.com> wrote:
>> Hi,
>>
>> I get this with both clean v2.6.26 and latest -git
>> (33af79d12e0fa25545d49e86afc67ea8ad5f2f40):
>>
>
> Thanks for the report, do you happen to have any messages above the
> panic message that would indicate if there was some sort of fs error
> that was hit before the panic?  That would help me figure out what
> exactly happened.  Thanks,

Yeah, the full log exists at

    http://folk.uio.no/vegardno/linux/log-1216293934.txt

I think this is the interesting part:

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_sb: bit already cleared
for block 1507
EXT3-fs error (device loop0): ext3_free_blocks: Freeing blocks not in
datazone - block = 1050159, count = 1
EXT3-fs error (device loop0) in ext3_reserve_inode_write: IO failure
EXT3-fs error (device loop0): ext3_free_blocks: Freeing blocks not in
datazone - block = 2048, count = 1
EXT3-fs error (device loop0): ext3_free_blocks: Freeing blocks not in
datazone - block = 102, count = 1
EXT3-fs error (device loop0): ext3_free_blocks: Freeing blocks not in
datazone - block = 496, count = 1
EXT3-fs error (device loop0): ext3_free_blocks: Freeing blocks not in
datazone - block = 245, count = 1
EXT3-fs error (device loop0): ext3_free_blocks: Freeing blocks not in
datazone - block = 1, count = 1
EXT3-fs error (device loop0): ext3_free_blocks: Freeing blocks not in
datazone - block = 8192, count = 1
EXT3-fs error (device loop0): ext3_free_blocks: Freeing blocks not in
datazone - block = 8192, count = 1
EXT3-fs error (device loop0): ext3_free_blocks: Freeing blocks not in
datazone - block = 256, count = 1
EXT3-fs error (device loop0): ext3_free_blocks: Freeing blocks not in
datazone - block = 1216293753, count = 1
EXT3-fs error (device loop0): ext3_free_blocks: Freeing blocks not in
datazone - block = 1216293753, count = 1
EXT3-fs error (device loop0): ext3_free_blocks: Freeing blocks not in
datazone - block = 1703965, count = 1
EXT3-fs error (device loop0): ext3_free_blocks: Freeing blocks not in
datazone - block = 257875, count = 1
EXT3-fs error (device loop0): ext3_free_blocks: Freeing blocks not in
datazone - block = 1, count = 1
EXT3-fs error (device loop0): ext3_free_blocks: Freeing blocks not in
datazone - block = 1216293738, count = 1
EXT3-fs error (device loop0): ext3_free_blocks: Freeing blocks not in
datazone - block = 15552000, count = 1
EXT3-fs error (device loop0): ext3_free_blocks: Freeing blocks not in
datazone - block = 1, count = 1
EXT3-fs error (device loop0): ext3_free_blocks: Freeing blocks not in
datazone - block = 11, count = 1
EXT3-fs error (device loop0): ext3_free_blocks: Freeing blocks not in
datazone - block = 128, count = 1
EXT3-fs error (device loop0): ext3_free_blocks: Freeing blocks not in
datazone - block = 52, count = 1
EXT3-fs error (device loop0): ext3_free_blocks: Freeing blocks not in
datazone - block = 6, count = 1
EXT3-fs error (device loop0): ext3_free_blocks: Freeing blocks not in
datazone - block = 1, count = 1
EXT3-fs error (device loop0): ext3_free_blocks: Freeing blocks not in
datazone - block = 3246399477, count = 1
EXT3-fs error (device loop0): ext3_free_blocks: Freeing blocks not in
datazone - block = 860559364, count = 1
EXT3-fs error (device loop0): ext3_free_blocks: Freeing blocks not in
datazone - block = 1659021227, count = 1
EXT3-fs error (device loop0): ext3_free_blocks: Freeing blocks not in
datazone - block = 2723221558, count = 1
EXT3-fs error (device loop0): ext3_free_blocks: Freeing blocks not in
datazone - block = 458752, count = 1
EXT3-fs error (device loop0): ext3_free_blocks: Freeing blocks not in
datazone - block = 8, count = 1
EXT3-fs error (device loop0): ext3_free_blocks: Freeing blocks not in
datazone - block = 11, count = 1
EXT3-fs error (device loop0): ext3_free_blocks: Freeing blocks not in
datazone - block = 1092049505, count = 1
EXT3-fs error (device loop0): ext3_free_blocks: Freeing blocks not in
datazone - block = 2823687499, count = 1
EXT3-fs error (device loop0): ext3_free_blocks: Freeing blocks not in
datazone - block = 2276435116, count = 1
EXT3-fs error (device loop0): ext3_free_blocks: Freeing blocks not in
datazone - block = 2703362334, count = 1
EXT3-fs error (device loop0): ext3_free_blocks: Freeing blocks not in
datazone - block = 258, count = 1
EXT3-fs error (device loop0): ext3_free_blocks: Freeing blocks not in
datazone - block = 1216293738, count = 1
EXT3-fs error (device loop0): ext3_free_blocks: Freeing blocks not in
datazone - block = 58, count = 13
EXT3-fs error (device loop0): ext3_free_blocks: Freeing blocks not in
datazone - block = 327, count = 1
EXT3-fs error (device loop0): ext3_free_blocks: Freeing blocks not in
datazone - block = 1048576, count = 1
EXT3-fs error (device loop0): ext3_free_blocks: Freeing blocks not in
datazone - block = 1, count = 1
BUG: unable to handle kernel NULL pointer dereference at 0000000c
IP: [<c01fd1e0>] journal_dirty_metadata+0xa0/0x160

Would it also help to reproduce with jbd/ext3 debug enabled? (If it
isn't already.)


Vegard

-- 
"The animistic metaphor of the bug that maliciously sneaked in while
the programmer was not looking is intellectually dishonest as it
disguises that the error is the programmer's own creation."
	-- E. W. Dijkstra, EWD1036
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