Kernel panic on kernel 3.8.x when closing bluetooth dun connection

Kernel panic on kernel 3.8.x when closing bluetooth dun connection

[Sergio Callegari]

Hi,

This is just a short note to let you know that 3.8.x panics on closing a 
bluetooth dun connection.

This is seen with the ubuntu /mainline/ kernel 3.8.0 and 3.8.2 that should 
vanilla kernels with no ubuntu tweaking.

Observed on a DELL E6500 which has BCM2046 Bluetooth while connecting to the
internet using a Samsung Galaxy S mobile phone via bluetooth DUN through the 
network manager.  When network manager is asked to close the connection, the 
kernel panics, the system drops out of Xorg, shows for a couple of seconds a 
long log including the words 'panic' and 'not synching', the numlock, caps-lock 
keys start flashing and the system freezes.

It is 100% repeatable.

kernels 3.7.0 and 3.7.8 do not panic.

Thanks for the attention and best regards,

Sergio Callegari

Kernel panic on kernel 3.8.x when closing bluetooth dun connection

[Sergio Callegari]

Hi,

I'm following up with a previous email where I was reporting a 
systematic kernel panic when closing a bluetooth DUN connection.

I have made a few more tests:

- Bug happens with all the 3.8.x kernel series, up to the latest 3.8.6
- Bug is not present up to 3.7.x, including the latest 3.7.10
- Bug happens on the DELL E6500 laptop that has a Dell Computer Corp. 
Wireless 370 Bluetooth Mini-card
- Bug also happens on a desktop that has a Cambridge Silicon Radio, Ltd 
Bluetooth Dongle (HCI mode)

Let me recall that the bug is triggered by connecting to the internet 
via a mobile phone, using bluetooth DUN and then disconnecting. Kernel 
panics on disconnection (the phone I am using is a Samsung Galaxy S Plus)

- Bug does not happen on the same machines when connecting to the 
internet via ppp using a usb-umts dongle

Hope this can helps haunting the regression.

Thanks for the attention,

Sergio