linux-ext4 - busy inodes -> ext3 umount crash

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Date:	Fri, 16 Apr 2010 20:09:05 +0200
From:	Jiri Slaby <jirislaby@...il.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	adilger@....com, linux-ext4@...r.kernel.org,
	Linux kernel mailing list <linux-kernel@...r.kernel.org>,
	Jan Kara <jack@...e.cz>
Subject: busy inodes -> ext3 umount crash

Hi,

with mmotm 2010-04-05-16-09 and much older (I hadn't camera to take a
picture) I sometimes get a BUG() trace in ext3 umount code:
http://www.fi.muni.cz/~xslaby/sklad/panics/ext3_1.png
http://www.fi.muni.cz/~xslaby/sklad/panics/ext3_2.png

I have no idea how to reproduce it :(, but it usually happens when I do
shutdown/kexec.

Those busy inodes are pretty common in current kernels, I don't know if
that's related -- I doubt it since it is for different bdevs.

Do you have any clue what to test, how to debug that?

@Honza: this is the one we talked about earlier, you wanted to see
details, but I thought it disappeared. (Just in case you are interested.)

Thanks.
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