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
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