EXT4 Data Corruption Bug Hits Stable Linux Kernels
As a warning for those who are normally quick to upgrade to the latest stable vanilla kernel releases, a serious EXT4 data corruption bug worked its way into the stable Linux 3.4, 3.5, and 3.6 kernel series.
Being discussed recently on the Linux kernel mailing list was an "apparent serious progressive ext4 data corruption bug in 3.6.3." Theodore Ts'o was able to successfully bisect the kernel and found the serious bug, which first appeared within the Linux 3.6.2 kernel and was since back-ported to older stable kernels.
From the user reporting this problem, "The bug did really quite a lot of damage to my /home fs in only a few minutes of uptime, given how few files I wrote to it. What it could have done to a more conventional distro install with everything including /home on one filesystem, I shudder to think."
Ted Ts'o wrote in the thread:
I think I've found the problem. I believe the commit at fault is commit 14b4ed22a6 (upstream commit eeecef0af5e):Here's a response with some more comments from one of the affected users for this EXT4 data corruption bug in the stable kernel.
To Ted's patch, Red Hat's Eric Sandeen reviewing the work raised some questions as to whether it fully fixed the problem and Ted has already tossed out a new patch.
The problematic commit causing this potential EXT4 data issue was back-ported previous to the stable Linux 3.4.x and 3.5.x kernels, which are reaching end-of-life. Hopefully an exception will be made and new kernels issued soon.
That's where things are at right now in the mailing list thread for this serious EXT4 data corruption issue that reached the stable Linux kernel.
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