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[Joseph Salisbury <joseph.salisbury@xxxxxxxxxxxxx>]

I built the next test kernel, up to the following commit:
5b284be46733010b15406e15e61871cc1c30dd5e

The test kernel can be downloaded from:
http://kernel.ubuntu.com/~jsalisbury/lp1249719

Can you test that kernel and report back if it has the bug or not. I
will build the next test kernel based on your test results.

Thanks in advance

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https://bugs.launchpad.net/bugs/1249719

Title:
  Kernel oops - BUG: unable to handle kernel NULL pointer dereference at
  0000000000000030; IP: [<ffffffff811c07c7>] touch_atime+0x17/0x140

Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  Since 3.11.0-13-generic, I've been encountering the following kernel
  oops. I can trigger it quite reliably by watching full-screen videos
  on YouTube using google-chrome (Version 31.0.1650.48) for roughly 10
  minutes. Once the oops happens, the system remains up, but certain
  programs (like top) start hanging and a reboot is needed to restore
  full functionality.

  I've tried using 3.12.0-999-generic (3.12.0-999.201311080433), but get
  the same problem there. I don't get the oops when booting into
  3.11.0-12-generic, so I suspect the problem was introduced in
  3.11.0-13-generic (especially since I see there were some changes made
  related to the shmat system call).

  Attached is the oops from dmesg. The EIP location and stack-trace are
  identical for all the oops I've seen so far.

  ProblemType: Bug
  DistroRelease: Ubuntu 13.10
  Package: linux-image-3.11.0-13-generic 3.11.0-13.20
  ProcVersionSignature: Ubuntu 3.11.0-13.20-generic 3.11.6
  Uname: Linux 3.11.0-13-generic x86_64
  ApportVersion: 2.12.5-0ubuntu2.1
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC2:  rick       1421 F.... pulseaudio
   /dev/snd/controlC1:  rick       1421 F.... pulseaudio
   /dev/snd/controlC0:  rick       1421 F.... pulseaudio
  Date: Sat Nov  9 23:24:33 2013
  HibernationDevice: RESUME=UUID=0ad92a6e-2969-424f-b469-faaa9f2ec20f
  InstallationDate: Installed on 2012-10-19 (387 days ago)
  InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Release amd64 (20121017.5)
  IwConfig:
   eth0      no wireless extensions.
   
   lo        no wireless extensions.
  MachineType: Gigabyte Technology Co., Ltd. X58A-UD3R
  MarkForUpload: True
  ProcFB: 0 radeondrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.11.0-13-generic root=UUID=cf7d6665-f4a9-4be8-a12d-c72a985ea5eb ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.11.0-13-generic N/A
   linux-backports-modules-3.11.0-13-generic  N/A
   linux-firmware                             1.116
  RfKill:
   
  SourcePackage: linux
  UpgradeStatus: Upgraded to saucy on 2013-10-19 (22 days ago)
  dmi.bios.date: 03/11/2010
  dmi.bios.vendor: Award Software International, Inc.
  dmi.bios.version: F5
  dmi.board.name: X58A-UD3R
  dmi.board.vendor: Gigabyte Technology Co., Ltd.
  dmi.board.version: x.x
  dmi.chassis.type: 3
  dmi.chassis.vendor: Gigabyte Technology Co., Ltd.
  dmi.modalias: dmi:bvnAwardSoftwareInternational,Inc.:bvrF5:bd03/11/2010:svnGigabyteTechnologyCo.,Ltd.:pnX58A-UD3R:pvr:rvnGigabyteTechnologyCo.,Ltd.:rnX58A-UD3R:rvrx.x:cvnGigabyteTechnologyCo.,Ltd.:ct3:cvr:
  dmi.product.name: X58A-UD3R
  dmi.sys.vendor: Gigabyte Technology Co., Ltd.

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