Looks like a bug in xfs, or you've just plain run out of memory. Maybe try latest kernel.
** Changed in: linux-source-2.6.20 (Ubuntu)
Importance: Undecided => Medium
Assignee: (unassigned) => Ubuntu Kernel Team
Status: Unconfirmed => Confirmed
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kernel BUG at mm/slab.c:1655!
https://launchpad.net/bugs/82448
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