Leann,

please look at the report. Comment #7 written on 2009-06-03 clearly
indentifies the problem and has a link explaining details.

This bug is not reproducable. I got it on a high-usage-server after more
than one year of usage and on a another box which isn't used heavily
after few month. Another box which was used by a customer crashed after
two weeks and we had a very hard time to recover the data.

It happens whenever the XFS free blocks table gets a corruption. If
you're lucky, the corruption isn't written to disk before the server
crashes. Otherwise, the crash occurs every time the system requests free
blocks and jumps into the corrupted area. (I'm neither a kernel not a
xfs guy, so please don't slap me if this is not 100% correct.)

This is clearly not "no-one-would-like-to-test-it-so-we-ignore-and-
close-it" - bug, it's a really critical thing, but it has been finally
resolved month ago. It should be easy to finally solve this issue on
Ubuntu, too.

All of us are currently lucky as long as you either get a power-outage
or crash and ext3 "recovers" your filesystem bei killing all files or
you're crash-safe but may run into the xfs-bug at any time.

Best Regards,
Sebastian

-- 
XFS internal error xfs_trans_cancel at line 1164 of file 
/build/buildd/linux-2.6.27/fs/xfs/xfs_trans.c
https://bugs.launchpad.net/bugs/294259
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