Date: Wed, 27 Apr 2011 08:07:51 +0200 From: Bernhard Schmidt <bschmidt@freebsd.org> To: Gardner Bell <gardnerbell@gmail.com> Cc: freebsd-stable@freebsd.org Subject: Re: Fatal trap 12: page fault while in kernel mode Message-ID: <201104270807.51592.bschmidt@freebsd.org> In-Reply-To: <BANLkTimHP4WcOfV4qz5BC%2ByzPpnoPHoUig@mail.gmail.com> References: <BANLkTimHP4WcOfV4qz5BC%2ByzPpnoPHoUig@mail.gmail.com>
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On Tuesday, April 26, 2011 17:35:32 Gardner Bell wrote:
> On Tue, Apr 26, 2011 at 04:25:26PM +0200, Bernhard Schmidt wrote:
> > On Tuesday, April 26, 2011 15:15:45 Gardner Bell wrote:
> > > On Tue, Apr 26, 2011 at 4:12 AM, Bernhard Schmidt <bschmidt@freebsd.org> wrote:
> > > > On Tuesday, April 26, 2011 01:09:42 Gardner Bell wrote:
> > > >> Downloading a torrent with many peers on a toshiba satellite notebook
> > > >> using an Atheros AR5006 wireless nic caused the following panic. This
> > > >> is an i386 system running 8.2-STABLE from around April 06.
> > > >
> > > > Can you reproduce that?
> > >
> > > So far I've not been able to reproduce this.
> >
> > Ok. I assume this only happens when loosing the connection and trying
> > to re-associate. At least that is the only possible scenario I can
> > think of where a timeout for mgmt frames is involved. Probably we
> > aren't bumping a refcount correctly or something. Actually that sounds
> > rather plausible as it panics exactly when trying to access ni which
> > should, for a station, always point to iv_bss, which can in turn be
> > free'd almost unconditionally if someone's telling net80211 to
> > associate to another (or even the same) network. Hmm.. tracing refcount
> > it is.
> >
> > Were you running wpa_supplicant at that point? Any messages before
> > the panic happened?
> >
>
> Yes, I'm running wpa_supplicant with the following settings:
>
> network={
> ssid="xxxxx"
> psk="xxxxx"
> }
>
> Other settings for the wireless card I have in rc.conf:
>
> wlans_ath0="wlan0"
> ifconfig_wlan0="WPA DHCP"
> ifconfig_wlan0_alias0="inet 192.168.0.12 netmask 0xffffffff"
>
>
> The last messages seen on the console before the panic are wlan0:
> ieee80211_new_state_locked: pending SCAN -> AUTH transition lost
> and several UP/DOWN events.
That's what I expected, thanks. I'll try to come up with something.
--
Bernhard
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