The Linux 4.0 Kernel Currently Has An EXT4 Corruption Issue
Written by Michael Larabel in Linux Storage on 19 May 2015 at 08:34 PM EDT. 45 Comments
LINUX STORAGE --
It appears that the current Linux 4.0.x kernel is plagued by an EXT4 file-system corruption issue. If there's any positive note out of the situation, it seems to mostly affect EXT4 Linux RAID users.

A Phoronix reader, Zoltán Tősér, wrote into Phoronix today about an unpatched EXT4 data corruption bug present as of the Linux 4.0.2 kernel. He explained, "several people were affected by an ext4 data corruption bug in Linux 4.0.2. The bug is reported to be unpatched even in the most recent stable version, Linux 4.0.4. We are not sure what exactly triggers the problem, using a RAID setup seems to have something to do with it. It is reported to affect multiple distributions, including Arch, Debian and Fedora, so it seems to be an upstream problem."

There's this Arch Linux thread discussing the Linux 4.0 EXT4 corruption issue with multiple users being affected. There's also this potentially related patch and this related Debian bug report. Fortunately as the problem seems to be somewhat widespread at least among multi-disk EXT4 users, the issue should get addressed in a stable Linux 4.0 point release in the very near future.
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Michael Larabel is the principal author of Phoronix.com and founded the site in 2004 with a focus on enriching the Linux hardware experience. Michael has written more than 10,000 articles covering the state of Linux hardware support, Linux performance, graphics drivers, and other topics. Michael is also the lead developer of the Phoronix Test Suite, Phoromatic, and OpenBenchmarking.org automated benchmarking software. He can be followed via Twitter or contacted via MichaelLarabel.com.

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