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[eccerr0r <blc+launchpad@xxxxxxxxxxxxxxx>]

Preliminary:
I just tried with 3.12-rc1 with blueman.  It doesn't work - if someone else could also try this it would be interesting.
When I tried connecting to dialup networking, it claims it "cannot connect to networkmanager" after trying to setup the DUN connection for a few moments - implying there was a dbus issue.  However the same setup, when I reboot back to 3.6.11, works fine - so userspace should be working.
It may be a kernel config error, but if someone else could also try it would be good.  I did see /dev/rfcomm0 get set up, need to try to see if I can do AT commands to /dev/rfcomm0 at least, but I don't have a terminal program installed on this laptop...

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https://bugs.launchpad.net/bugs/1165433

Title:
  Kernels from 3.8.x to 3.11.x panic on bluetooth DUN disconnect

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  Issue is obviously in the kernel that should not panic in any circumnstances.
  This bug is seen on quantal using the kernel from PPA mainline. Tested with 3.8.0 to 3.8.6.
  Since 3.8.x is going to be the raring kernel I believe that this should definitely be fixed before raring is shipped.

  Seen on:

  DELL E6500 with kubuntu quantal 12.10 64 bit and as said, kernel 3.8.6 from the mainline ppa.
  The machine has a Dell Computer Corp. Wireless 370 Bluetooth Mini-card (connected via an internal usb connection).

  The issue is shown when connecting to the internet via a Samsung Galaxy S plus phone, using a bluetooth DUN connection.
  It is reproducible every time.

  How to reproduce:

  1) Use the bluetooth applet to discover the phone and associate to it.
  2) Use network manager to setup a DUN connection with the phone through your APN
  3) Connect to the internet via bluetooth DUN (connection works perfectly)
  4) Disconnect from the network manager.

  At the same time you disconnect, the GUI session is terminated and the
  kernel panics, briefly showing a panic log on the screen.

  Note that:

  a) The issue is not present using the standard ubuntu quantal kernel
  b) The issue is not present using kernels from the mainline ppa before 3.8 (e.g., 3.7.x is fine for all x)
  c) The issue is not present when connecting to the internet using a USB mobile dongle (e.g. Huawei usb key)

  This looks pretty serious to me: kernel does not sync when panicing
  and there is a serious risk of data loss; connecting to the internet
  via a smart phone using bluetooth DUN seems to be something that one
  should take for granted on any modern OS. Furthermore, points a) and
  b) above show that this is a *regression* over previous kernels.

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