linux-kernel - RE: 3.5.0 iwlagn AP crash...

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Message-ID: <1DC40B07CD6EC041A66726C271A73AE619593035@IRSMSX102.ger.corp.intel.com>
Date:	Mon, 23 Jul 2012 06:54:29 +0000
From:	"Berg, Johannes" <johannes.berg@...el.com>
To:	Daniel J Blueman <daniel@...ra.org>,
	Intel Linux Wireless <ilw@...ux.intel.com>
CC:	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: RE: 3.5.0 iwlagn AP crash...

> > When running my Centrino Wireless-N 130 BGN (rev 0xb0) card in nl80211
> > AP mode with hostapd on linux 3.5.0, I immediately hit this fatal
> > pagefault [1].
> >
> > I can cook a debug kernel, reproduce, disassemble the code and do some
> > quick analysis, if that helps get the ball rolling?

> > BUG: unable to handle kernel NULL pointer dereference at      (null)
> > IP: [<ffffffffa02e869d>] ieee80211_ave_rssi+0xd/0x50 [mac80211]
> 
> From my debug kernel, sdata is clearly NULL:
> 
> (gdb) list *0xffffffff815b74f8
> 0xffffffff815b74f8 is in ieee80211_ave_rssi (net/mac80211/util.c:1801).
> 1796	int ieee80211_ave_rssi(struct ieee80211_vif *vif)
> 1797	{
> 1798		struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);

I'll look into it, thanks.

johannes
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