From: Pavel Roskin <proski@gnu.org>
To: Jack Lau <jackelectronics@hotmail.com>
Cc: linux-wireless@vger.kernel.org
Subject: Re: kernel panic ieee80211_agg_splice_packets+0x3d/0xc0 [mac80211]
Date: Sun, 26 Jul 2009 16:40:16 -0400 [thread overview]
Message-ID: <1248640816.32168.42.camel@mj> (raw)
In-Reply-To: <BAY0-DP2-2945C3011C834624418944BD170@phx.gbl>
On Sun, 2009-07-26 at 17:35 +0000, Jack Lau wrote:
>
> This is my very first post on a public mailing list where I am not
> into programming. I just set up and configure Linux but have very
> little experience with programing except BASIC and shell scripting.
>
> I have recently assembled a Linux server and router (no GUI) where I
> am using an Atheros AR9160 controller (Sparklan WMIA-268N) as an
> access point. I am using Ubuntu 9.04 jaunty release but using hostapd
> 0.69 from the upcoming 9.10 karmic release because the one that comes
> with jaunty does not support nl80211.
>
> The problem is that I am constantly getting kernel panics, each time
> of the same error kernel panic ieee80211_agg_splice_packets+0x3d/0xc0
> [mac80211]
You can find where it happens if you kernel is compiled with the debug
information (CONFIG_DEBUG_INFO in .config). Load the mac80211 module in
gdb:
gdb /lib/modules/`uname -r`/kernel/net/mac80211/mac80211.ko
On the gdb prompt, run:
l *(ieee80211_agg_splice_packets+0x3d)
Actually, ieee80211_agg_splice_packets is a short function. Perhaps you
could add debug print statements to find possible errors. For instance,
local->hw is used. It would crash if local is NULL. So you add before
that place:
printk("local = %p\n", local);
Likewise, check sta, sta->ampdu_mlme.tid_tx[tid] and local->pending. Or
just print the line numbers. You will see which printk is run last
before the crash.
> I enclose screenshots of 3 occurrences, the last occurrence with the
> options nosmp noacpi acpi=off noapic just to see if it solves the
> problem but it didn't. Most frustratingly, I hate it when I am the
> only person experiencing it because searching Google yields nothing
> with this error.
Chances are it's because 802.11n is not used much with ath9k in AP mode.
--
Regards,
Pavel Roskin
next prev parent reply other threads:[~2009-07-26 20:40 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-07-26 17:35 kernel panic ieee80211_agg_splice_packets+0x3d/0xc0 [mac80211] Jack Lau
2009-07-26 20:40 ` Pavel Roskin [this message]
2009-07-28 21:21 ` Jack Lau
2009-07-28 22:48 ` Pavel Roskin
2009-07-30 22:48 ` Jack Lau
2009-07-31 14:26 ` Jack Lau
[not found] ` <SNT102-W3823D5AFC70CB052684837BD110@phx.gbl>
2009-08-02 4:18 ` Pavel Roskin
2009-08-02 12:55 ` Jack Lau
2009-08-02 12:57 ` Jack Lau
2009-08-05 19:23 ` Jack Lau
2009-08-02 17:26 ` Jack Lau
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