From: Benjamin Herrenschmidt Subject: Re: Rampant ext3/4 corruption on 2.6.34-rc7 with VIVT ARM (Marvell 88f5182) Date: Thu, 13 May 2010 08:13:59 +1000 Message-ID: <1273702439.21352.128.camel@pasglop> References: <1273569821.21352.19.camel@pasglop> <1273575478.21352.29.camel@pasglop> <20100512150057.GA29867@atrey.karlin.mff.cuni.cz> Mime-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit Cc: Nicolas Pitre , linux-kernel@vger.kernel.org, Saeed Bishara , Andrew Morton , linux-ext4@vger.kernel.org, "James E.J. Bottomley" , linux-arm-kernel@lists.infradead.org To: Jan Kara Return-path: Received: from gate.crashing.org ([63.228.1.57]:42266 "EHLO gate.crashing.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752749Ab0ELWRn (ORCPT ); Wed, 12 May 2010 18:17:43 -0400 In-Reply-To: <20100512150057.GA29867@atrey.karlin.mff.cuni.cz> Sender: linux-ext4-owner@vger.kernel.org List-ID: > 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.