If I understood correctly, disabling write back cache must be done on
the device (ie disk). However, the script I pointed in comment 19 tests
the filesystem creating it in RAM. However, I also tried mounting with
data=ordered instead of data=writeback (default), but it didn't affect
the results.

Kernel 2.6.31-rc4 fixes the problem.
Note that 2.6.29-rc1 also fixes it, if you want to check an earlier version.

I also did the same test on a 32 bits virtual machine and got the same
results using default kernel for Ubuntu 9.04 Server (2.6.28) and
2.6.31-rc4.

-- 
disk corruption ext3_free_blocks_sb: bit already cleared for block 232785 
https://bugs.launchpad.net/bugs/209346
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