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SubjectRe: [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@lst.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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