I also experience crashes when bluetooth is on.

$ uname -a
Linux t420 3.5.3-030503-generic #201208252335 SMP Sun Aug 26 03:35:56 UTC 2012 
x86_64 x86_64 x86_64 GNU/Linux

I consistently see some of the following in the crash screen trace.

do_exit
oops_end
die
do_generall_protection
? l2cap_chan_destory
l2cap_sock_kill
l2cap_sock_close
l2cap_conn_del
l2cap_connect)cfm

Always some reference to l2cap witch i understand is part of the
bluetooth stack.


** Attachment added: "Screen shot of crash screen."
   
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/877370/+attachment/3401094/+files/20121016_135714-CrashBlueTooth.jpg

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https://bugs.launchpad.net/bugs/877370

Title:
  full system crash when using Bluetooth 11.10

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