linux-kernel - Re: [PATCH 1/1] um: ubd: Fix data corruption

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Date:	Tue, 5 Oct 2010 16:31:37 -0400
From:	Chris Frey <cdfrey@...rsquare.net>
To:	Tejun Heo <htejun@...il.com>
Cc:	Jens Axboe <jaxboe@...ionio.com>,
	Richard Weinberger <richard@....at>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"jdike@...toit.com" <jdike@...toit.com>,
	"user-mode-linux-devel@...ts.sourceforge.net" 
	<user-mode-linux-devel@...ts.sourceforge.net>,
	"user-mode-linux-user@...ts.sourceforge.net" 
	<user-mode-linux-user@...ts.sourceforge.net>,
	"janjaap@....nl" <janjaap@....nl>,
	"geert@...ux-m68k.org" <geert@...ux-m68k.org>,
	"martin.petersen@...cle.com" <martin.petersen@...cle.com>,
	"adobriyan@...il.com" <adobriyan@...il.com>,
	"syzop@...nscan.org" <syzop@...nscan.org>
Subject: Re: [PATCH 1/1] um: ubd: Fix data corruption

On Tue, Oct 05, 2010 at 10:23:19AM +0200, Tejun Heo wrote:
> Hmmmm, can you please give a shot at the following one?  Thank you.

I applied this patch on top of stock 2.6.35.5 as usual (no other patches)
and tested on my maverick image as before.  I ran a fsck.ext3 on the
filesystem image from the host before my test, just to make sure, and
there were no errors.

Unfortunately, this patch does not fix the issue either.  I get errors
in the guest like the following:

EXT3-fs error (device ubda): htree_dirblock_to_tree: bad entry in directory #1137497: 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 #1137497) - no `.' or `..'
EXT3-fs error (device ubda): htree_dirblock_to_tree: bad entry in directory #1137587: 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 #1137587) - no `.' or `..'
EXT3-fs error (device ubda): htree_dirblock_to_tree: bad entry in directory #1137619: 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 #1137619) - no `.' or `..'
EXT3-fs error (device ubda): htree_dirblock_to_tree: bad entry in directory #1137532: 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 #1137532) - no `.' or `..'
EXT3-fs (ubda): warning: ext3_rmdir: empty directory has nlink!=2 (6)
EXT3-fs (ubda): warning: ext3_rmdir: empty directory has nlink!=2 (3)


And later on:

EXT3-fs error (device ubda): ext3_lookup: deleted inode referenced: 867196
EXT3-fs error (device ubda): ext3_lookup: deleted inode referenced: 484932
EXT3-fs error (device ubda): ext3_lookup: deleted inode referenced: 484932


- Chris

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