linux-kernel - Re: [PATCH] fs-writeback: fix NULL pointer dereference in, __mark_inode

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Date:	Thu, 10 Mar 2011 11:39:46 +0100
From:	Torsten Hilbrich <torsten.hilbrich@...unet.com>
To:	linux-kernel@...r.kernel.org
CC:	Andreas Bießmann <biessmann@...science.de>,
	"Hilbrich, Torsten" <Torsten.Hilbrich@...unet.com>,
	Sergey Senozhatsky <sergey.senozhatsky@...il.com>
Subject: Re: [PATCH] fs-writeback: fix NULL pointer dereference in, __mark_inode_dirty

I ran into the same problem and successfully applied your fix.

I was able to reproduce this panic and bisected it to the following commit:

commit aaead25b954879e1a708ff2f3602f494c18d20b5
Author: Christoph Hellwig <hch@....de>
Date:   Mon Oct 4 14:25:33 2010 +0200

    writeback: always use sb->s_bdi for writeback purposes

The steps to reproduce it on my test system (T60p with Intel Core Duo) were.

- /dev/sdb is an USB stick with partition sdb1 formatted as ext2
- mount /dev/sdb1 /mnt
- cat > /mnt/foo
- now press return some times
- remove stick
- press return, panic takes place

Hope this helps fixing the problem,

	Torsten
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