linux-kernel - Re: NULL pointer dereference in ext4_ext_remove

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Message-ID: <20120817174841.GA4519@infradead.org>
Date:	Fri, 17 Aug 2012 13:48:41 -0400
From:	Christoph Hellwig <hch@...radead.org>
To:	Theodore Ts'o <tytso@....edu>,
	Fengguang Wu <fengguang.wu@...el.com>,
	Marti Raudsepp <marti@...fo.org>,
	Kernel hackers <linux-kernel@...r.kernel.org>,
	ext4 hackers <linux-ext4@...r.kernel.org>, maze@...gle.com
Subject: Re: NULL pointer dereference in ext4_ext_remove_space on 3.5.1

On Fri, Aug 17, 2012 at 09:15:58AM -0400, Theodore Ts'o wrote:
> Thanks Fengguang:
> 
> For the record, I was able to find my own easy repro, last night using
> only a 220 meg partition:
> 
> # mke2fs -t ext4 -b 1024 -J size=1 /dev/vdc
> # mount -t ext2 /dev/vdc /vdc
> # mkdir /vdc/a
> # cd /vdc/a
> # seq 1 210000  | xargs -n 1 fallocate -l 1m
> # seq 1 2 210000  | xargs /bin/rm
> # mkdir /vdc/b
> # cd /vdc/b
> # seq 1 103 | xargs -n 1 fallocate -l 1g
> # cd /
> # umount /vdc
> # mount -t ext4 -o commit=10000 /dev/vdc /vdc
> # rm -rf /vdc/b

Can you submit this for xfstests?

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