linux-kernel - Re: ext3 filesystem corruption in user mode linux

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Message-ID: <20100924060557.GA21238@foursquare.net>
Date:	Fri, 24 Sep 2010 02:05:57 -0400
From:	Chris Frey <cdfrey@...rsquare.net>
To:	linux-kernel@...r.kernel.org
Subject: Re: ext3 filesystem corruption in user mode linux

On Fri, Sep 24, 2010 at 12:14:10AM -0400, Chris Frey wrote:
> If I do some heavy CPU and disk work in the guest, something like this:
> 
> 	# (cd /usr && tar cjf - portage) | tar xjf -
> 	# rm -rf portage
> 
> Then the filesystem corrupts itself, giving errors like the following
> in dmesg, during the rm:
> 
>     EXT3-fs error (device ubda): ext3_lookup: deleted inode referenced: 51715


Update:

So far I have been unable to make 2.6.32.21 corrupt its filesystem
when running as the UML kernel (Host 2.6.35.4, UML 2.6.32.21)

When running UML 2.6.33.7, I get similar errors:

EXT3-fs error (device ubda): ext3_lookup: deleted inode referenced: 21397
EXT3-fs error (device ubda): ext3_lookup: deleted inode referenced: 13257
EXT3-fs error (device ubda): ext3_lookup: deleted inode referenced: 13257
EXT3-fs error (device ubda): ext3_lookup: deleted inode referenced: 21403
EXT3-fs error (device ubda): ext3_lookup: deleted inode referenced: 21403
EXT3-fs error (device ubda): ext3_lookup: deleted inode referenced: 13262
EXT3-fs error (device ubda): ext3_lookup: deleted inode referenced: 13262
EXT3-fs error (device ubda): htree_dirblock_to_tree: bad entry in directory #13269: rec_len is smaller than minimal - offset=0, inode=0, rec_len=0, name_len=0
EXT3-fs (ubda): warning: empty_dir: bad directory (dir #13269) - no `.' or `..'
EXT3-fs (ubda): warning: ext3_rmdir: empty directory has nlink!=2 (3)


If anyone wants me to test a specific UML kernel, please let me know.

- Chris

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