linux-ext4 - Re: Rampant ext3/4 corruption on 2.6.34-rc7 with VIVT ARM (Marvell 88f5182)

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Date:	Thu, 13 May 2010 08:13:59 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Jan Kara <jack@...e.cz>
Cc:	Nicolas Pitre <nico@...vell.com>, linux-kernel@...r.kernel.org,
	Saeed Bishara <saeed@...vell.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-ext4@...r.kernel.org,
	"James E.J. Bottomley" <jejb@...isc-linux.org>,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: Rampant ext3/4 corruption on 2.6.34-rc7 with VIVT ARM (Marvell
 88f5182)


>   Could you get the filesystem image with: e2image -r /dev/sdb2 buggy-image
> bzip2 it and make it available somewhere? Maybe I could guess something
> from the way the filesystem gets corrupted.
>   Oh, and also overwrite the partition with zeros before calling mkfs to make
> the analysis simpler.

Will do asap.

> > In fact, if I do ls /mnt/test/usr/bin/ I see debconf but if I do
> > ls /mnt/test/usr/bin/chrt then I get No such file or directory.
> > 
> > So something is badly wrong :-)
> > 
> > Now, trying without the dir_index feature (mkfs.ext3 -O ^dir_index)
> > and it works fine. All my md5sum's are correct and fsck passes.
>   Funny. Not sure how that could happen...

Yeah, strange. I looked at the code a bit and I don't see anything
obvious, ext3 seems to be using the same standard buffer head access
methods for the htree as for the rest of the metadata, and I see no
fancy playing with virtual addresses that could explain a VIVT problem.

I could be an issue with the SATA controller that gets more easily
triggered by the access patterns caused by htree, though that's a bit
strange.

I'll let you know when I have something to look at.

Cheers,
Ben.


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