Comment 27 for bug 330824

@21:
>Vanilla kernel 2.6.29-rc8 works well for me. So either this problem was fixed in kernel >2.6.29-rc8, or the problem is caused by Ubuntu kernel patches.

Any chance you can try a vanilla 2.6.28 kernel and see if you can reproduce the problem there? Other very interesting test points would be 2.6.28-rc5, and 2.6.28-rc7. Potential fixes that might have fixed this are:

http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=ba4439165f0f0d25b2fe065cf0c1ff8130b802eb

and

http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=7ce9d5d1f3c8736511daa413c64985a05b2feee3

The first patch, which I suspect is more likely the fix, was merged into 2.6.28.8 and 2.6.28-rc6. The second patch was merged into 2.6.28-rc8, and isn't yet in a 2.6.28.y series yet, although it is in the for_stable branch of the ext4 git tree.

Hence it would be interesting to see if the problem is present in 2.6.28-rc5, and fixed in 2.6.28-rc6. (And thanks to whoever can do the test, since I haven't been able to figure out how to replicate it on my systems yet.)