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Message #70058
[Bug 1165433] Re: Kernels from 3.8.x to 3.11.x panic on bluetooth DUN disconnect
I managed to find one more bug report similar to this one. So now there
are at least four bug reports (including this one) here in Launchpad on
this problem:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1144322
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1165433
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1189998
https://bugs.launchpad.net/ubuntu/+source/linux-lts-raring/+bug/1256811
Anyway, if these are about the same bug that I think they are, the bug
has now been completely fixed in kernel version 3.14, though kernel
version 3.12 included some of the fix. Also there was one previous fix
that is also needed that I think was backported to stable before 3.12.
I think I manged to list all the necessary commits, Here are links to
the commits, in case they need to be backported:
The first fix (pre 3.12?):
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=1d9e689c934bd5ecb0f273c6c65e0655c5cfee5f
The fixes in 3.12:
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=396dc223dd36edd218650d042a07c5e61f022c5b
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=ebe937f74b8a72cf3ceeae5c2194a160bb092901
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=54b926a1434e817ca84cb090f36b56763e192470
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=cad348a17e170451ea8688b532a6ca3e98c63b60
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=ece3150dea382c7c961fe2604332ed3474960d25
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=ffe6b68cc5999a3f91a15b6667e69e14186e337d
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=29cd718beba999bda4bdbbf59b5a4d25c07e1547
And finally the fixes in 3.14:
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=5b899241874dcc1a2b932a668731c80a3a869575
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=e228b63390536f5b737056059a9a04ea016b1abf
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=4a2fb3ecc7467c775b154813861f25a0ddc11aa0
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=f86772af6a0f643d3e13eb3f4f9213ae0c333ee4
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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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