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Ext4 Bug Since Linux Kernel Version 3.6.2

Ted Ts'o reports that in an Ext4 file system can be corrupted under the following circumstances:

- the journal starts at block zero
- mount and umount the file system two times in a row very quickly

In worst case the meta data can be corrupted which can of course lead to the loss of data on that file system.

This problem might also occur in the kernel 3.5.x series because this code.