A few months back there was an EXT4 file-system corruption bug
that impacted stable Linux kernel releases and was widely-covered. Today, another EXT4 file-system bug was corrected within the mainline Linux kernel.
Fortunately, compared to the corruption bug a few months back that affected stable kernel releases, this new corruption issue isn't nearly as bad. This new issue was only created a few weeks prior with the Linux 3.9 kernel merge window and thus hasn't reached a stable kernel release. Additionally, the issue only affects big endian systems, like some from PowerPC, MIPS, and SPARC.
The commit to "fix big-endian bugs which could cause fs corruptions" was merged on Wednesday with this commit
. For those users of EXT4 on big endian systems wishing to learn more about the potential EXT4 corruption issue from Linux 3.9 development kernels, see the EXT4 mailing list