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[era <453579@xxxxxxxxxxxxxxxxxx>]

papukaija: could you please update the bug description to point to
pertinent bugs for other kernel versions?  I'm seeing what I suspect to
be ext4 corruption on multi-CPU systems (I think all amd64) or various
kernels, on both small and large files.  Where and how should I report
this?  So far, this bug seems the closest match.

Other ext4 bugs I have looked at: bug #438379 (pretty exclusively about
suspend/resume problem), bug #317781 (seems to focus on 0-byte files;
certainly seems closer to what I am looking at in bug #582341).

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https://bugs.launchpad.net/bugs/453579

Title:
  in-place corruption of large files *without fsck or reboot* reported
  with linux 2.6.31-14.46 on ext4

Status in The Linux Kernel:
  Invalid
Status in Release Notes for Ubuntu:
  Fix Released
Status in “linux” package in Ubuntu:
  Invalid
Status in “linux” source package in Karmic:
  Invalid

Bug description:
  There are worrying reports of filesystem corruption on ext4 in karmic.
  Scott says:

  12:36 < Keybuk> this whole ext4 thing is worrying me
  12:36 < Keybuk> I just downloaded an iso image, md5sum didn't match
  12:36 < Keybuk> downloaded it into an ext3 partition, matched just fine
  12:59 < Keybuk> and I know mvo has seen bugs with corrupted .debs in /var/cache/apt/archives
  12:59 < Keybuk> which seems to imply its any file large enough to use lots of extents

  I'm opening this bug report so that this bug gets tracked & triaged
  for karmic.  If we're unable to isolate the issue, we should consider
  rolling back to ext3 as the default filesystem in the installer.

  ProblemType: Bug
  Architecture: amd64
  ArecordDevices:
   **** List of CAPTURE Hardware Devices ****
   card 0: Intel [HDA Intel], device 0: AD198x Analog [AD198x Analog]
     Subdevices: 1/1
     Subdevice #0: subdevice #0
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  vorlon     3350 F.... pulseaudio
  Card0.Amixer.info:
   Card hw:0 'Intel'/'HDA Intel at 0xee240000 irq 17'
     Mixer name	: 'Analog Devices AD1981'
     Components	: 'HDA:11d41981,17aa2025,00100200'
     Controls      : 20
     Simple ctrls  : 11
  Date: Fri Oct 16 16:01:26 2009
  DistroRelease: Ubuntu 9.10
  HibernationDevice: RESUME=UUID=f108133c-6b9d-4d28-9058-0b3a0c5549b4
  MachineType: LENOVO 6371CTO
  Package: linux-image-2.6.31-14-generic 2.6.31-14.46
  PccardctlIdent:
   Socket 0:
     no product info available
  PccardctlStatus:
   Socket 0:
     no card
  ProcCmdLine: root=/dev/mapper/hostname-root ro
  ProcEnviron:
   PATH=(custom, user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcVersionSignature: Ubuntu 2.6.31-13.44-generic
  RelatedPackageVersions: linux-firmware 1.22
  SourcePackage: linux
  Uname: Linux 2.6.31-13-generic x86_64
  WpaSupplicantLog:

  dmi.bios.date: 12/27/2006
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 7IET23WW (1.04 )
  dmi.board.name: 6371CTO
  dmi.board.vendor: LENOVO
  dmi.board.version: Not Available
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Not Available
  dmi.modalias: dmi:bvnLENOVO:bvr7IET23WW(1.04):bd12/27/2006:svnLENOVO:pn6371CTO:pvrThinkPadT60:rvnLENOVO:rn6371CTO:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 6371CTO
  dmi.product.version: ThinkPad T60
  dmi.sys.vendor: LENOVO

  ls