kernel Oops - modprobe -r iwl4965

[Marcello Desantis]

Binary package hint: linux-backports-modules-2.6.24-21-generic

If you try to remove the iwl4965 module with modprobe -r iwl4965 the kernel crashes. The problems seems to be related to traffic control management in mac80211.ko. Note that the same crash can be obtained issuing:
tc qdisc del dev wmaster0 root

As long as you don't touch any TC parameter the driver works flawlessly (even thought it doesn't switch the wifi LED on anymore).

The problem appeared in linux-backports-modules-2.6.24-20-generic.

I'm attaching a picture of the dump because the system is not able to write it on the disk.

[Andreas Moog (ampelbein)]

Thanks for reporting this bug and any supporting documentation. Since this bug has enough information provided for a developer to begin work, I'm going to mark it as confirmed and let them handle it from here. Thanks for taking the time to make Ubuntu better!

[Christian Kujau (christiank)]

looks like the oops in http://madwifi.org/ticket/2086. If so, it does not seem to be specific to iwl4965, but maybe to the QoS code. I wonder if this occurs on (current) vanilla kernels too...

[Marcello Desantis (m-desantis)]

It seems to be _exactly_ the same oops :-). BTW the oops is more likely to be fired by some parameters used by the mac80211 module to invoke the QoS cleanup than by the QoS code itself. The latter is supposed to be called in any network module removal, but as long as the mac80211 module isn't involved no oops arises.

[Launchpad Janitor (janitor)]

Per a decision made by the Ubuntu Kernel Team, bugs will longer be assigned to the ubuntu-kernel-team in Launchpad as part of the bug triage process. The ubuntu-kernel-team is being unassigned from this bug report. Refer to https://wiki.ubuntu.com/KernelTeamBugPolicies for more information. Thanks.

[Phillip Susi (psusi)]

8.04 has reached end of life and this package removed. If you still have this issue on a currently supported release, please reopen it and reassign it to the linux package