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[James Henstridge <james.henstridge@xxxxxxxxxxxxx>]

I tried out a test kernel from henrix at
http://people.canonical.com/~henrix/lp1244505/v1/ which also exhibited
an oops.  The stack trace was a bit longer with the top of the oops
scrolling off the screen, but it still contained the appleir_raw_event
and key_down frames.

I also tried disabling LIRC and booting with the stock Saucy kernel,
where I wasn't able to reproduce the crash via the remote.  I then tried
blacklisting the hid-appleir driver and having lircd start.  This time,
lircd complained about not being able to open /dev/usb/hiddev0.
Presumably some other driver bound the device to provide raw HID access
in the Raring kernel.

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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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