* Kernel panic on stable kernel 3.8.2 when closing bluetooth dun connection
@ 2013-03-20 10:18 Sergio Callegari
2013-03-20 16:17 ` Greg KH
0 siblings, 1 reply; 5+ messages in thread
From: Sergio Callegari @ 2013-03-20 10:18 UTC (permalink / raw)
To: stable; +Cc: linux-kernel
Hi,
This is just a short note to let you know that 3.8.2 panics on closing a
bluetooth dun connection.
This is seen with the ubuntu mainline kernel 3.8.2 that should be a vanilla
stable kernel.
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.
The ubuntu kernel, that is a 3.5.0 plus ubuntu tweaks, backports, etc does not
panic.
Thanks for the attention and best regards,
Sergio Callegari
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: Kernel panic on stable kernel 3.8.2 when closing bluetooth dun connection
2013-03-20 10:18 Kernel panic on stable kernel 3.8.2 when closing bluetooth dun connection Sergio Callegari
@ 2013-03-20 16:17 ` Greg KH
2013-03-21 11:50 ` Sergio Callegari
` (2 more replies)
0 siblings, 3 replies; 5+ messages in thread
From: Greg KH @ 2013-03-20 16:17 UTC (permalink / raw)
To: Sergio Callegari; +Cc: stable, linux-kernel
On Wed, Mar 20, 2013 at 11:18:38AM +0100, Sergio Callegari wrote:
> Hi,
>
> This is just a short note to let you know that 3.8.2 panics on
> closing a bluetooth dun connection.
Have you notified the linux bluetooth developers about this? Is this
new in 3.8.2 and 3.8.1 or 3.8 works fine?
thanks,
greg k-h
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: Kernel panic on stable kernel 3.8.2 when closing bluetooth dun connection
2013-03-20 16:17 ` Greg KH
@ 2013-03-21 11:50 ` Sergio Callegari
2013-03-22 22:35 ` Sergio Callegari
2013-04-08 16:17 ` Kernel panic on kernel 3.8.x, 3.9RC6 when closing bluetooth dun connection (regression from 3.7.x) Sergio Callegari
2 siblings, 0 replies; 5+ messages in thread
From: Sergio Callegari @ 2013-03-21 11:50 UTC (permalink / raw)
To: stable; +Cc: linux-kernel
On 20/03/2013 17:17, Greg KH wrote:
> Have you notified the linux bluetooth developers about this? Is this new in
> 3.8.2 and 3.8.1 or 3.8 works fine? thanks, greg k-h
Hi, thanks for the advice.
I have verified that the issue was introduced with 3.8.0 and is not due to
stabilization patches in the 3.8.x series. 3.7.x is fine (from x=0 to x=8)
Sorry for not having checked earlier, but I was incorrectly taken for granted
that if the bug was back in 3.8.0 someone would have noticed already...
Now notifying the bluetooth developers too.
Sergio
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: Kernel panic on stable kernel 3.8.2 when closing bluetooth dun connection
2013-03-20 16:17 ` Greg KH
2013-03-21 11:50 ` Sergio Callegari
@ 2013-03-22 22:35 ` Sergio Callegari
2013-04-08 16:17 ` Kernel panic on kernel 3.8.x, 3.9RC6 when closing bluetooth dun connection (regression from 3.7.x) Sergio Callegari
2 siblings, 0 replies; 5+ messages in thread
From: Sergio Callegari @ 2013-03-22 22:35 UTC (permalink / raw)
To: stable; +Cc: linux-kernel
In the end it may not be caused by bluetooth, but by ppp.
Found bug reports on ubuntu indicating that 3.8.x panic on ppp disconnection.
Unfortunately, I cannot try without bluetooth with my configuration.
(when wired, phone does not use ppp, but appears as a wired network interface).
Sergio
^ permalink raw reply [flat|nested] 5+ messages in thread
* Kernel panic on kernel 3.8.x, 3.9RC6 when closing bluetooth dun connection (regression from 3.7.x)
2013-03-20 16:17 ` Greg KH
2013-03-21 11:50 ` Sergio Callegari
2013-03-22 22:35 ` Sergio Callegari
@ 2013-04-08 16:17 ` Sergio Callegari
2 siblings, 0 replies; 5+ messages in thread
From: Sergio Callegari @ 2013-04-08 16:17 UTC (permalink / raw)
To: linux-kernel
Hi,
I'm following up with a previous email where I was reporting a systematic kernel
panic/system freeze when closing a bluetooth DUN connection.
I have made a few more tests, all with 64 bit machines:
- Bug happens with all the 3.8.x kernel series, up to the latest 3.8.6
- Bug happens with the 3.9RC6 kernel
- 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 gsm/umts dongle and the same provider, so the bug seems to be BT
related and not common to all internet connections using a Point to Point serial
protocol.
Unfortunately, I see the bug on a machine that I use for day by day work and
I cannot afford bisecting here.
Nonetheless, the bug seems easy to reproduce (I catched it on two different
machines with different setups). So I hope this note can help haunting the
regression anyway.
Thanks for the attention,
Sergio Callegari
^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2013-04-08 16:17 UTC | newest]
Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed)
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2013-03-20 10:18 Kernel panic on stable kernel 3.8.2 when closing bluetooth dun connection Sergio Callegari
2013-03-20 16:17 ` Greg KH
2013-03-21 11:50 ` Sergio Callegari
2013-03-22 22:35 ` Sergio Callegari
2013-04-08 16:17 ` Kernel panic on kernel 3.8.x, 3.9RC6 when closing bluetooth dun connection (regression from 3.7.x) Sergio Callegari
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