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[Sergio Callegari <sergio.callegari@xxxxxxxxx>]

There is no activity from me because I have unsubscribed from the bug...
it is just by chance that I am reading this now.

This bug has been investigated and fixed in recent linux ages ago and
Jussi, eccerr0r and I have provided all the relevant information and
pointers in this thread. It has also been clarified in LKML that due to
the type of bug it is quite meaningless to provide traces and that this
bug may cause data loss due to corruption of the kernel data structures.
Yet, dangerous as it is, and regardless of the many users confirmig the
issue, the bug remains unconfirmed because there is no apport-collect
that is considered much more important than all the other info. And
since the bug is not confirmed, the ubuntu kernel developers are just
ignoring the report and all the useful pointers to upstream discussion.
And not surprisingly ubuntu remains unfixed months after the upstream
fix. Similarly not surprisingly duplicate bug reports spring out without
being recognized as such.

Unfortunately, I must say that I really find it a waste of time to
report bugs and spend time in checking the LKML and provide pointers to
the root relevant discussion there and pointers to upstream patches that
fix the issue in this condition. And this is why I gave in. Also it is a
bit sad that eccerr0r is invited not stay out of the discussion in the
duplicate 1256811 just because his main OS is gentoo.

I am also really sorry to say that the management of this bug report
seems to me as all rules and bureaucracy and zero substance, but I hope
that this can be accepted as constructive criticism, since I'm also
taking the time to try to explain why I'm getting this impression.

-- 
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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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