linux-ext4 - Re: ext3 on latest -git: BUG: unable to handle kernel NULL pointer dereference at 0000000c

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Date:	Thu, 17 Jul 2008 15:39:24 +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 3:34 PM, Josef Bacik <josef@...icpanda.com> wrote:
>> Yeah, the full log exists at
>>
>>    http://folk.uio.no/vegardno/linux/log-1216293934.txt
>>
>> I think this is the interesting part:
>
> Hmm well the journal should have aborted, but it looks like it didn't,
> are you mounting with errors=continue by any chance?  Thanks much,

No, this is the command I used:

        mount -o loop disk mnt

I think this looks interesting:

EXT3-fs error (device loop0) in ext3_reserve_inode_write: IO failure

The code in ext3_reserve_inode_write() is here:

        err = ext3_journal_get_write_access(handle, iloc->bh);
        if (err) {
                brelse(iloc->bh);
                iloc->bh = NULL;
        }

Maybe it should do something different here?

But I don't know :-)

Thanks for helping out!


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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