linux-kernel - Re: kernel BUG at fs/btrfs/extent-tree.c:1353

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Date:	Fri, 23 Jul 2010 12:02:20 +0100
From:	Daniel J Blueman <daniel.blueman@...il.com>
To:	Johannes Hirte <johannes.hirte@....tu-ilmenau.de>
Cc:	miaox@...fujitsu.com, Dave Chinner <david@...morbit.com>,
	Chris Mason <chris.mason@...cle.com>,
	linux-kernel@...r.kernel.org, linux-btrfs@...r.kernel.org,
	zheng.yan@...cle.com, Jens Axboe <axboe@...nel.dk>,
	linux-fsdevel@...r.kernel.org
Subject: Re: kernel BUG at fs/btrfs/extent-tree.c:1353

On 22 July 2010 19:07, Johannes Hirte <johannes.hirte@....tu-ilmenau.de> wrote:
> Am Montag 19 Juli 2010, 10:01:46 schrieb Miao Xie:
>> On Thu, 15 Jul 2010 20:14:51 +0200, Johannes Hirte wrote:
>> > Am Donnerstag 15 Juli 2010, 02:11:04 schrieb Dave Chinner:
>> >> On Wed, Jul 14, 2010 at 05:25:23PM +0200, Johannes Hirte wrote:
>> >>> Am Donnerstag 08 Juli 2010, 16:31:09 schrieb Chris Mason:
>> >>> I'm not sure if btrfs is to blame for this error. After the errors I
>> >>> switched to XFS on this system and got now this error:
>> >>>
>> >>> ls -l .kde4/share/apps/akregator/data/
>> >>> ls: cannot access .kde4/share/apps/akregator/data/feeds.opml: Structure
>> >>> needs cleaning
>> >>> total 4
>> >>> ?????????? ? ?    ?        ?            ? feeds.opml
>> >>
>> >> What is the error reported in dmesg when the XFS filesytem shuts down?
>> >
>> > Nothing. I double checked the logs. There are only the messages when
>> > mounting the filesystem. No other errors are reported than the
>> > inaccessible file and the output from xfs_check.
>>
>> Is there anything wrong with your disks or memory?
>> Sometimes the bad memory can break the filesystem. I have met this kind of
>> problem some time ago.
>
> I don't think that's the case. I've checked the RAM with memtest86+ and got no
> errors. I got the errors with two different disks, the first one with btrfs the
> second one now with XFS. Before changing to the second disk, I've run
> badblocks on it to be sure it has no errors.

There are some known-buggy chipsets also. One still around is the
Nvidia CK804/MCP55, under certain patterns of spatially-local pending
reads and writes to the memory controller, a 64-byte request would
occasionally be returned with the wrong offset. I was hitting it with
some 27-Gbit adapters and managed to capture it on a PCI-e protocol
analyser. Rsync between network and local disk would hit sometimes
too.
-- 
Daniel J Blueman
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