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[Jussi Saarinen <1165433@xxxxxxxxxxxxxxxxxx>]

Gianluca Anzolin's patches that should fix this problem have now been
merged to bluetooth-next. Eventually they should find their way to
mainline and stable kernels.

http://marc.info/?l=linux-bluetooth&m=137699050920055&w=2

https://git.kernel.org/cgit/linux/kernel/git/bluetooth/bluetooth-
next.git/commit/?id=1f088c00f11cd5b09e215cf31010ed3854f62b9a

https://git.kernel.org/cgit/linux/kernel/git/bluetooth/bluetooth-
next.git/commit/?id=befa7d049165e6d47859fb827ee5671354f30284

https://git.kernel.org/cgit/linux/kernel/git/bluetooth/bluetooth-
next.git/commit/?id=33040aa77f9ba8f0e3120f2e15917a74aef7ee07

https://git.kernel.org/cgit/linux/kernel/git/bluetooth/bluetooth-
next.git/commit/?id=e5e5db0dcfb07cf40cbec7e198443a8f67a844c2

https://git.kernel.org/cgit/linux/kernel/git/bluetooth/bluetooth-
next.git/commit/?id=77f577d52aefb92c350f65c4228958415a05510f

https://git.kernel.org/cgit/linux/kernel/git/bluetooth/bluetooth-
next.git/commit/?id=288f2fc4203559d225d84f1a0308198ad7a06c65

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

Title:
  Kernel 3.8.x panics 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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