I've tried 3.12-rc2, as far as I can tell just opening and closing the
rfcomm in BT seems to no longer crash the box - however, some
characteristics changed and NetworkManager no longer accepts
/dev/rfcomm* as a valid communications device as before, so I can't
fully test it.

A bit tricky - using the same userland,

Linux-3.5.7-gentoo - works flawlessly
Linux-3.8.13-gentoo - crashes when BT rfcomm is closed
Linux-3.12-rc2 (raw from kernel.org) - blueman able to set up rfcomm but 
networkmanager does not notice that rfcomm was setup.  Supposedly NM should 
notify blueman via dbus that it acknowledges the device, but blueman times out 
waiting and NM does not recognize the device.  In trying to diagnose the 
problem I tried using busybox microcom on /dev/rfcomm0 directly.  I was able to 
send my modem AT commands like on previous kernels, indicating the bluetooth 
link indeed works.  I was able to shutdown the rfcomm link on blueman as well 
after sending those bytes through.  No crash - a positive sign... but it may 
depend on the number of bytes sent.

I'll need to see why NM does not like the rfcomm device now, but I am no
NM or dbus expert...

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https://bugs.launchpad.net/bugs/1144322

Title:
  [Toshiba Satellite A80] Kernel 3.8.x Panic when disconnecting from
  network manager via ppp0

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