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Reported by Jouni Siren to the linux-ext4 mailing list,
http://marc.info/?l=linux-ext4&m=133424246404043&w=2

fixed by a one-line patch to fs/ext4/file.c,
http://marc.info/?l=linux-ext4&m=133424653606040&w=2

verified on 2.6.32-220.7.1.el6.x86_64 kernels,
and verified the patch fixes the problem on said kernels,
http://marc.info/?l=linux-ext4&m=133484292912874&w=2

*** This bug has been marked as a duplicate of bug 814302 ***