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Critical EXT4 Data Corruption Bug Has Been Fixed

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http://news.softpedia.com – A bug that was first introduced into Linux kernel 3.6.3, and that got backported into 3.4x and 3.5.x branches, causing quite a ruckus because it could have led to some serious data loss, was patched by none other than Theodore Ts'o, a maintainer of the EXT4 file system. “If the journal's starting block is zero, we fail to truncate the journal when we unmount the file system. This can happen if we mount and then unmount the file system fairly quickly, before the log has a cha... (read more) (General)

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Submitted by netcastaustralia on 11/01/2012 – Made popular on 11/01/2012

Stories similar to Critical EXT4 Data Corruption Bug Has Been Fixed

An EXT4 Data Corruption Bug has made its way into several stable kernels and has caused some mild panic, until it got resolved.

The bug was first introduced into Linux kernel 3.6.3, and that it was backported into 3.4x and 3.5.x branches. Not to worry, a patch is already being pushed into the kernel tree for the next stable releas... (read more)

I'm going to move journal to another partition, but I don't know how to correctly caculate the size needed for journal?

I'm running ext4 file system with 15GB capacity.

A recent file-system bug has been found with EXT4 that has made its way into the stable Linux kernel releases 3.4, 3.5 and 3.6. This EXT4 bug results in data-corruption and it is activated when the file-system is unmounted too frequently within a short period.

ReiserFS is the Journaled file system used for the Linux operating system. For the various features of this file system like metadata- only journaling, tail packing and online resizing, it is well adopted by the users who rely on it as the repository of data references.

There are 3 of them: data=journal data=ordered data=writeback

Do I understand it correct - "writeback" provides best performance and you can lose data easily. "Journal" provides worst performance and best data protection.

Hi everybody!

I try to mount a partition in ext4, and i was following this french thread : http://forum.ubuntu-fr.org/viewtopic.php?id=383127

but, i was stuk at 2 line (of command) next the end.... It was possible to view the /media/video in ext4, but it was impossible to write on it... And i saw a folder in /media/video, is name was lost&found, like the home folder, before the user....

And

Ext3 is a journaled file system and maintains a journal file to prevent instances of metadata corruption due to unexpected power outage. Due to its wide testing base and relative simplicity, the file system is considered to be safer than its counterparts. But it is not completely immune to crashes.

On file systems like btrfs you can preform a scrub, which will go though all the data to see if the data still matches the file system checksum.

I would like to check the data on ext4 if it is correct before a backup.

Question

ext4 doesn't have file system checksum, but can something similar be made?

Sometimes when you try to install device drivers on your Linux system, you might fail to do it. It could be due to incompatibility of the operating system Kernel with your device driver or device.