Re: d80211 deadlock with wpa_supplicant and rmmod

On 7/12/07, Johannes Berg [off-list ref] wrote:

On Wed, 2007-07-11 at 19:41 -0400, John W. Linville wrote:

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I believe we have a deadlock in d80211.

I have it too. But I'm using iwl3945 driver, in-kernel mac80211, and a
gentoo kernel (basically a patched vanilla-2.6.22.1). My machine is a
x86_64 core 2 duo.

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The following triggers it on my 2way SMT machine with preempt.

modprobe bcm43xx-d80211
add sta0
ifconfig sta0 up
start wpa_supplicant on the interface
rmmod bcm43xx-d80211

Sounds like the bug with the scheduled work locking. See the
"mac80211/bcm43xx deadlock" thread, there's a patch, report back if you
can/can not reproduce with the patch.

Hello, sorry for the delay but I only managed to try it out today..
I've applied the patch and tortured the system as far as I could, and
no hang at all :)

I've read the thread and it apparently replaces one bad problem for a
lesser one, so I understand if it's not applied.. But at least there
is a place in the code to point as the culprit :)

Thanks,
  Renato Caldas