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[James Henstridge <james.henstridge@xxxxxxxxxxxxx>]

Public bug reported:

After upgrading to Ubuntu Saucy (32 bit), I am able to reliably
reproduce a crash by pressing any button on the IR remote of a Mac Mini.

The system is running XBMC and using LIRC to handle the remote.  The
system locks up on the first button press on the remote, and prints an
Oops message if I switch to a virtual terminal first.  The same happens
if I exit XBMC and shut down lircd first.  If I boot to the 3.8.0 kernel
from Raring, the problem does not occur.

The dmesg output also shows non fatal intel_pipe_config_compare warnings
that appear to be identical to bug 1211976, but I'm not sure if they are
related.

$ uname -a
Linux tim-Macmini 3.11.0-12-generic #19-Ubuntu SMP Wed Oct 9 16:12:00 UTC 2013 i686 i686 i686 GNU/Linux

$ cat /proc/version_signature
Ubuntu 3.11.0-12.19-generic 3.11.3

The oops doesn't seem to be written to the log, so I've attached a photo
for reference.  I've also included the dmesg log from right before I
triggered the oops.

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: Confirmed


** Tags: kernel-oops

** Attachment added: "Photo of oops log"
   https://bugs.launchpad.net/bugs/1244505/+attachment/3890585/+files/macmini-oops.jpg

** Tags added: kernel-oops

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https://bugs.launchpad.net/bugs/1244505

Title:
  Kernel oops - unable to handle kernel NULL pointer dereference; EIP is
  at input_event+0x23/0x70

Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  After upgrading to Ubuntu Saucy (32 bit), I am able to reliably
  reproduce a crash by pressing any button on the IR remote of a Mac
  Mini.

  The system is running XBMC and using LIRC to handle the remote.  The
  system locks up on the first button press on the remote, and prints an
  Oops message if I switch to a virtual terminal first.  The same
  happens if I exit XBMC and shut down lircd first.  If I boot to the
  3.8.0 kernel from Raring, the problem does not occur.

  The dmesg output also shows non fatal intel_pipe_config_compare
  warnings that appear to be identical to bug 1211976, but I'm not sure
  if they are related.

  $ uname -a
  Linux tim-Macmini 3.11.0-12-generic #19-Ubuntu SMP Wed Oct 9 16:12:00 UTC 2013 i686 i686 i686 GNU/Linux

  $ cat /proc/version_signature
  Ubuntu 3.11.0-12.19-generic 3.11.3

  The oops doesn't seem to be written to the log, so I've attached a
  photo for reference.  I've also included the dmesg log from right
  before I triggered the oops.

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