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

[Ben Greear <greearb@candelatech.com>]

On 10/04/2010 04:48 PM, Luis R. Rodriguez wrote:
> On Mon, Oct 4, 2010 at 2:38 PM, Ben Greear<greearb@candelatech.com>  wrote:
>> 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).
>
> You may want to look at using netconsole instead if you're goal is
> just to get some oops off the box.
>
> CONFIG_NETCONSOLE=m
>
> mcgrof@tux ~/bin $ cat netconsole
> #!/bin/bash
> sudo dmesg -n 8
> sudo ip addr add 192.168.4.2/24 dev eth4
> sudo modprobe netconsole
> netconsole="@192.168.4.2/eth4,@192.168.4.3/00:1e:37:82:48:5a"
>
> I'd run that script on the dev box, and on 192.168.4.3 just do `nc -l
> -p 6666 | tee log`. To test just modprobe and rmmod ath9k.

I have serial-console, is netconsole any better, or just useful
if you don't have serial console?

I was sort of hoping kgdb would magically drop me into a debug
shell on panic and let me look at backtraces and variables...but
instead the system would go OOM, hard-lock, or panic and show a single
line of panic and then dead to the world.  I've enough to debug w/out
debugging kgdb as well :)

Thanks,
Ben


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