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[Maarten Baert <maarten-baert@xxxxxxxxxxx>]

The tests I did confirmed what I suspected:

* kernel 3.13 is affected (if aesni_intel is loaded)
* kernel 3.11 is affected (if aesni_intel is loaded)
* kernel 3.10 is affected (if aesni_intel is loaded)
* kernel 3.9 is NOT affected (ecryptfs doesn't use aesni_intel so it doesn't matter whether it's loaded)

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https://bugs.launchpad.net/bugs/1265841

Title:
  kernel BUG at /build/buildd/linux-3.11.0/fs/buffer.c:1268!; RIP:
  0010:[<ffffffff816e3efd>]  [<ffffffff816e3efd>]
  check_irqs_on.part.11+0x4/0x6

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  This only happens when aesni_intel is loaded.

  In my attempts to find an easy way to reproduce this bug:
  https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1265684
  I actually found a very simple way to trigger a bug that is similar but not identical. I suspect that both bugs have the same cause: something in the kernel is disabling IRQs and the ext4 code will crash when this happens. The stack trace for this bug is different from the other one. This one appears to be less severe, the system is still usable after the crash, only the process that caused the crash will hang (uninterruptible sleep). This bug is 100% reproducible on both Ubuntu 13.10 with kernel 3.11.0 and Arch Linux with kernel 3.12.6.

  The steps to reproduce the bug are based on this:
  http://www.spinics.net/lists/linux-ext4/msg38949.html

  * Set up an ecryptfs 'Private' folder in your home directory.
  * In that directory, create a file called 'crashme.c' with the following code in it:
  #include <assert.h>
  int main() { assert(0); }

  * Compile the program:
  gcc -Wall crashme.c -o crashme

  * Change the core dump pattern so core dumps are saved in the current directory:
  echo "coredump-%p" | sudo tee /proc/sys/kernel/core_pattern

  * Enable core dumps:
  ulimit -c unlimited

  * Make sure that you have a second terminal open to run dmesg, because you may not be able to do so later.
  * Run 'crashme' - this will hang and trigger the bug:
  ./crashme

  ProblemType: Bug
  DistroRelease: Ubuntu 13.10
  Package: linux-image-3.11.0-15-generic 3.11.0-15.23
  ProcVersionSignature: Ubuntu 3.11.0-15.23-generic 3.11.10
  Uname: Linux 3.11.0-15-generic x86_64
  NonfreeKernelModules: nvidia
  ApportVersion: 2.12.5-0ubuntu2.2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  maarten    1666 F.... lxpanel
  CRDA: Error: [Errno 2] No such file or directory: 'iw'
  Date: Fri Jan  3 15:58:24 2014
  EcryptfsInUse: Yes
  HibernationDevice: RESUME=UUID=bc17e234-da75-457f-b17c-22d9c0e27dd8
  InstallationDate: Installed on 2013-12-28 (6 days ago)
  InstallationMedia: Lubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1)
  IwConfig:
   eth0      no wireless extensions.

   lo        no wireless extensions.
  MachineType: Gigabyte Technology Co., Ltd. Z87X-D3H
  MarkForUpload: True
  ProcFB: 0 EFI VGA
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.11.0-15-generic.efi.signed root=UUID=5a8ae1fc-91bf-4ce0-8dea-a519976fd56b ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.11.0-15-generic N/A
   linux-backports-modules-3.11.0-15-generic  N/A
   linux-firmware                             1.116
  RfKill:

  SourcePackage: linux
  StagingDrivers: zram
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 08/02/2013
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: F7
  dmi.board.asset.tag: To be filled by O.E.M.
  dmi.board.name: Z87X-D3H-CF
  dmi.board.vendor: Gigabyte Technology Co., Ltd.
  dmi.board.version: x.x
  dmi.chassis.asset.tag: To Be Filled By O.E.M.
  dmi.chassis.type: 3
  dmi.chassis.vendor: Gigabyte Technology Co., Ltd.
  dmi.chassis.version: To Be Filled By O.E.M.
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrF7:bd08/02/2013:svnGigabyteTechnologyCo.,Ltd.:pnZ87X-D3H:pvrTobefilledbyO.E.M.:rvnGigabyteTechnologyCo.,Ltd.:rnZ87X-D3H-CF:rvrx.x:cvnGigabyteTechnologyCo.,Ltd.:ct3:cvrToBeFilledByO.E.M.:
  dmi.product.name: Z87X-D3H
  dmi.product.version: To be filled by O.E.M.
  dmi.sys.vendor: Gigabyte Technology Co., Ltd.

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