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

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Message-ID: <CAMVG2suiMXojoptfNNJEZWhiBfgVcU99BTvG6jqdKAFGBf65MA@mail.gmail.com>
Date:	Sun, 22 Jul 2012 18:10:21 +0800
From:	Daniel J Blueman <daniel@...ra.org>
To:	Intel Linux Wireless <ilw@...ux.intel.com>,
	Johannes Berg <johannes.berg@...el.com>
Cc:	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: 3.5.0 iwlagn AP crash...

On 22 July 2012 17:15, Daniel J Blueman <daniel@...ra.org> wrote:
> Hi Johannes et al,
>
> 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?
>
> Thanks!
>   Daniel
>
> --- [1]
>
> 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);
1799		struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1800	
1801		if (WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_STATION)) {
1802			/* non-managed type inferfaces */
1803			return 0;
1804		}
1805		return ifmgd->ave_beacon_signal;
-- 
Daniel J Blueman
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