An EXT4 file-system data corruption issue has reached the stable Linux kernel. The latest Linux 3.4, 3.5, 3.6 stable kernels have an EXT4 file-system bug described as an apparent serious progressive ext4 data corruption bug. http://linux.slashdot.org/story/12/10/24/1848203/ext4-data-corruption-bug-hits-linux-kernel