linux-ext4 - Re: [bug] ext{3,4}: __find_get_block

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Date:	Tue, 20 Sep 2011 20:08:29 +0200
From:	Thilo-Alexander Ginkel <thilo@...kel.com>
To:	Jan Kara <jack@...e.cz>
Cc:	linux-kernel@...r.kernel.org, linux-ext4@...r.kernel.org
Subject: Re: [bug] ext{3,4}: __find_get_block_slow() failed on 3.0.3

On Mon, Sep 5, 2011 at 14:59, Jan Kara <jack@...e.cz> wrote:
>  Something has corrupted your buffer head structure in memory (and we then
> infinitely looped in __getblk_slow()). bh->b_blocknr has been 0xC139000B9
> which it should have been 0x139000B9 (5th byte has been changed from 0x00
> to 0x0C). It might be a hw fault, buggy driver, or some other bug - hard to
> say. You might want to run memtest for some time, or enable some kernel debug
> options (DEBUG_PAGEALLOC, DEBUG_SLAB) which might catch the code causing
> corruption (this assumes it's at least occasionally reproducible and your
> are willing to take the performance hit)...

Thanks for your reply and sorry for the slow response. As my system
also experienced lockups from time to time I performed an extensive
memtest run, which actually brought up sporadic memory corruption
(some bits flipping to zero) after 20 hours or so. I swapped CPU,
mainboard and RAM and have not experienced any problems since then, so
I guess this was the cause of the issue.

Thanks,
Thilo
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