Re: Crash in agg-tx.c, with ath9k and lots of STA VIFs.

[Ben Greear <greearb@candelatech.com>]

On 10/04/2010 02:13 PM, Luis R. Rodriguez wrote:
> On Mon, Oct 4, 2010 at 2:12 PM, Luis R. Rodriguez<mcgrof@gmail.com>  wrote:
>> On Mon, Oct 4, 2010 at 12:10 PM, Johannes Berg
>> <johannes@sipsolutions.net>  wrote:
>>> On Mon, 2010-10-04 at 12:04 -0700, Ben Greear wrote:
>>>> On 10/04/2010 12:01 PM, Johannes Berg wrote:
>>>>> On Mon, 2010-10-04 at 11:51 -0700, Ben Greear wrote:
>>>>>> Just in case this seems familiar to anyone...
>>>>>>
>>>>>> IP: [<f8ba74da>] ieee80211_stop_tx_ba_session+0x14/0x84 [mac80211]
>>>>>
>>>>> Do you have debug info that'd point to a code line?
>>>>>
>>>>> I have never heard of this.
>>>>
>>>> I don't actually know how to get a line of code out of those
>>>> hex offsets...
>>>>
>>>> Someone told me many years ago..but I lost that information :P
>>>
>>> Err, I never remember either, I think Luis knows the gdb thing ... I
>>> usually use "objdump -dS"
>>
>> gdb net/mac80211/mac80211.ko
>> l *(ieee80211_stop_tx_ba_session+0x14/0x84)
>
> Oops I meant:
>
> gdb net/mac80211/mac80211.ko
> l *(ieee80211_stop_tx_ba_session+0x14)

Thank!

I had to re-compile with debugging symbols, and added kgdb (hopefully
that won't mess anything up).

Reading symbols from /home/greearb/kernel/2.6/wireless-testing-dbg.p4s/net/mac80211/mac80211.ko...done.
(gdb) l *(ieee80211_stop_tx_ba_session+0x14)
0x54fe is in ieee80211_stop_tx_ba_session (/home/greearb/git/linux.wireless-testing/net/mac80211/agg-tx.c:595).
590	
591	int ieee80211_stop_tx_ba_session(struct ieee80211_sta *pubsta, u16 tid)
592	{
593		struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
594		struct ieee80211_sub_if_data *sdata = sta->sdata;
595		struct ieee80211_local *local = sdata->local;
596		struct tid_ampdu_tx *tid_tx;
597		int ret = 0;
598	
599		trace_api_stop_tx_ba_session(pubsta, tid);


I'm not sure I quite got the hang of kgdb yet, but hoping to get that working
and reproduce with it enabled...

Thanks,
Ben

>
>     Luis


-- 
Ben Greear <greearb@candelatech.com>
Candela Technologies Inc  http://www.candelatech.com