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[denace <denace03@xxxxxxxxx>]

Good

** Changed in: linux (Ubuntu)
     Assignee: (unassigned) => denace (denace03)

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https://bugs.launchpad.net/bugs/992424

Title:
  ext4 filesystem errors on SSD disk

Status in Linux:
  Fix Released
Status in linux package in Ubuntu:
  Fix Released

Bug description:
  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

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