I'm not sure this will fix it, but it might.

It seems possible that if the jfsCommit thread is kept busy, and the
metadata it is operating on is all in cache, it could hold onto the cpu
longer than it should.

** Attachment added: "add call to cond_resched() in jfs_lazycommit()"
   http://launchpadlibrarian.net/20450228/resched.patch

-- 
kernel BUG: soft lockup - CPU#0 stuck for 11s! [jfsCommit:2338]
https://bugs.launchpad.net/bugs/283843
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