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[Robert Collins <1180021@xxxxxxxxxxxxxxxxxx>]

http://lists.gnu.org/archive/html/qemu-devel/2013-04/msg02662.html

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https://bugs.launchpad.net/bugs/1180021

Title:
  I/O errors seen on tmpfs

Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  Occasionally when using diskimage-builder on a large system with a
  large TMPFS, we see this error:

  qemu-img: error while compressing sector 2069504: Input/output error

  The exact operation that is happening is that qemu-img is taking a
  .raw file that is on a tmpfs partition and converting it to a qcow2
  image. However, sometimes we also see errors when we create a loopback
  device and mkfs onto it.

  The exact steps to reproduce:

  git clone https://github.com/stackforge/diskimage-builder.git
  cd diskimage-builder
  bin/disk-image-create -x -a i386 base

  It does not happen every time, maybe 1 in 10. However I have seen it
  on both Ubuntu 12.10 systems and Ubuntu 13.04, all on amd64. Also many
  times the errors are accompanied by these:

  May 13 16:09:57 clint-HP kernel: [975578.653245] Buffer I/O error on device loop2p1, logical block 1943681
  May 13 16:09:57 clint-HP kernel: [975578.653251] Buffer I/O error on device loop2p1, logical block 1943682
  May 13 16:09:57 clint-HP kernel: [975578.653256] Buffer I/O error on device loop2p1, logical block 1943683
  May 13 16:09:57 clint-HP kernel: [975578.653261] Buffer I/O error on device loop2p1, logical block 1943684
  May 13 16:09:57 clint-HP kernel: [975578.653266] Buffer I/O error on device loop2p1, logical block 1943685
  May 13 16:09:57 clint-HP kernel: [975578.653271] Buffer I/O error on device loop2p1, logical block 1943686
  May 13 16:09:57 clint-HP kernel: [975578.653275] Buffer I/O error on device loop2p1, logical block 1943687
  May 13 16:09:57 clint-HP kernel: [975578.653283] Buffer I/O error on device loop2p1, logical block 1943680
  May 13 16:09:57 clint-HP kernel: [975578.653288] Buffer I/O error on device loop2p1, logical block 1943681

  ProblemType: Bug
  DistroRelease: Ubuntu 13.04
  Package: linux-image-3.8.0-19-generic 3.8.0-19.30
  ProcVersionSignature: Ubuntu 3.8.0-19.29-generic 3.8.8
  Uname: Linux 3.8.0-19-generic x86_64
  ApportVersion: 2.9.2-0ubuntu8
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  clint      3245 F.... pulseaudio
   /dev/snd/controlC0:  clint      3245 F.... pulseaudio
  Date: Tue May 14 10:05:58 2013
  HibernationDevice: RESUME=UUID=b753173e-b967-403e-b076-b1cfb5bc6e80
  InstallationDate: Installed on 2013-01-14 (120 days ago)
  InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Release amd64+mac (20121017.3)
  MachineType: Hewlett-Packard HP EliteBook Folio 9470m
  MarkForUpload: True
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.8.0-19-generic root=/dev/mapper/ubuntu-root ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.8.0-19-generic N/A
   linux-backports-modules-3.8.0-19-generic  N/A
   linux-firmware                            1.106
  SourcePackage: linux
  UpgradeStatus: Upgraded to raring on 2013-04-30 (13 days ago)
  dmi.bios.date: 09/24/2012
  dmi.bios.vendor: Hewlett-Packard
  dmi.bios.version: 68IBD Ver. F.30
  dmi.board.name: 18DF
  dmi.board.vendor: Hewlett-Packard
  dmi.board.version: KBC Version 62.13
  dmi.chassis.asset.tag: CNU2439PZT
  dmi.chassis.type: 10
  dmi.chassis.vendor: Hewlett-Packard
  dmi.modalias: dmi:bvnHewlett-Packard:bvr68IBDVer.F.30:bd09/24/2012:svnHewlett-Packard:pnHPEliteBookFolio9470m:pvrA1029D1103:rvnHewlett-Packard:rn18DF:rvrKBCVersion62.13:cvnHewlett-Packard:ct10:cvr:
  dmi.product.name: HP EliteBook Folio 9470m
  dmi.product.version: A1029D1103
  dmi.sys.vendor: Hewlett-Packard

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