Public bug reported:
After Upgrading from 11.10 to 12.04 I quickly got EXT4 Filesystem errors
on my root-fs, which will result in / being remounted as readonly.
How to reproduce:
1. Boot 12.04 with latest 12.04 kernel (3.2.0.24.26)
2. Start some io-heavy (probably write-intensive) task, like syncing your
mailboxes with offlineimap
3. Bumm -> / is mounted as readonly (there are 2 partitions /boot and / )
Dmesg then Usually shows these 4 lines, but nothing more:
[11742.577091] EXT4-fs error (device dm-1): ext4_mb_generate_buddy:739: group
908, 32254 clusters in bitmap, 32258 in gd
[11742.577100] Aborting journal on device dm-1-8.
[11742.577337] EXT4-fs (dm-1): Remounting filesystem read-only
[11742.577357] EXT4-fs (dm-1): ext4_da_writepages: jbd2_start:
9223372036854775807 pages, ino 14876673; err -30
You can then reboot your system, let fsck find a few errors it can fix,
reboot again (as /-fs changed) and repeat the steps above.
I can boot my 12.04 with the kernel of 11.10 (2.6.38-12.51) and everything
works fine (except the wireless card, but that's probably an unrelated bug). So
I assume it must be a regression in the EXT4-code of the latest 12.04 Kernel.
Also I had no problems with 11.10 and all its previous versions.
This happens only on my laptop that uses an INTEL SSDSA2CW160G3. On
another machine, which I upgraded at the same time and I use as
frequently as my laptop, but with a normal SATA disk it didn't happen so
far. Both machines, have 2 partitions, while the LVM for the root
filesystem and swap is on the second - an encrypted partition:
/dev/sda1 /boot
/dev/sda2 -> cryptsetup
-> lvm
-> root
-> swap
As both systems are setup the same way, but only the desktop behaves
badly on the latest kernel, I assume it could have todo something with
the SSD disk, therefor SSD in the title of that bug report.
My fstab looks like this:
$ cat /etc/fstab
# /etc/fstab: static file system information.
#
# <file system> <mount point> <type> <options> <dump> <pass>
proc /proc proc defaults 0 0
# /dev/mapper/foo-root
UUID=5eb462f7-485f-48f0-a50b-f07de47c8d01 / ext4
defaults,errors=remount-ro,relatime 0 1
# /dev/sda1
UUID=c69c5d4d-179f-43c7-a793-bc10254f2b1c /boot ext3
defaults,relatime 0 2
# /dev/mapper/foo-swap_1
UUID=e8c2dc03-1b7a-4bb9-a983-cdf40d77d50f none swap sw
0 0
Attached is also a dmesg-output with the 12.04 Kernel and a lspci-vnn
output. After submitting that bug I will boot into the newer kernel and
also attach uname and version_signature output.
If you need any additional information, please let me know.
$ lsb_release -rd
Description: Ubuntu 12.04 LTS
Release: 12.04
$ apt-cache policy linux-image
linux-image:
Installed: 3.2.0.24.26
Candidate: 3.2.0.24.26
Version table:
*** 3.2.0.24.26 0
500 http://archive.ubuntu.com/ubuntu/ precise-updates/main amd64
Packages
100 /var/lib/dpkg/status
3.2.0.23.25 0
500 http://archive.ubuntu.com/ubuntu/ precise/main amd64 Packages
** Affects: linux-meta (Ubuntu)
Importance: Undecided
Status: New
** Tags: ext4 kernel ssd
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https://bugs.launchpad.net/bugs/992424
Title:
ext4 filesystem errors on SSD disk
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