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This is a tracking bug for an ext4 kernel bugzilla:

http://bugzilla.kernel.org/show_bug.cgi?id=12624

This request was evaluated by Red Hat Product Management for inclusion in a Red
Hat Enterprise Linux major release.  Product Management has requested further
review of this request by Red Hat Engineering, for potential inclusion in a Red
Hat Enterprise Linux Major release.  This request is not yet committed for
inclusion.

This should have been fixed last year - is this still an issue?

tested in 2.6.32-42.el6.x86_64

# mkfs.ext4 -b 1024 /dev/sda2
# mount -o data=journal /dev/sda2 /mnt
# ltp/fsstress -d /mnt -n 10000 -p 4
# umount /mnt/test

nothing happens,so this should be fixed