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[Peter Karasev <992424@xxxxxxxxxxxxxxxxxx>]

Additional info:  note that the drive has been absolutely beaten down
mercilessly in that year with building 20GB+  MSVC solution projects in
numerous directories, recursive changes to permissions on many files,
weekly unpacking and writing many TB's of zip files.

      Is the io error symptoms possibly more of an issue once the drive
has gotten a lot of heavy use?

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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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