On Mon, Sep 5, 2011 at 14:59, Jan Kara [off-list ref] 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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