netdev - Re: d80211 deadlock with wpa

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Message-ID: <1caff7430707130505r579ef08cmacc6c77f7535a66c@mail.gmail.com>
Date:	Fri, 13 Jul 2007 13:05:43 +0100
From:	"seventh guardian" <seventhguardian@...il.com>
To:	netdev@...r.kernel.org, linux-wireless@...r.kernel.org
Subject: Re: d80211 deadlock with wpa_supplicant and rmmod

On 7/12/07, Johannes Berg <johannes@...solutions.net> wrote:
> On Wed, 2007-07-11 at 19:41 -0400, John W. Linville wrote:
>
> > > >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.
> > >
> > > >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
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