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Re: wireless-testing, p54 and sinus 154 data no longer works

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Christian Lamparter wrote:
> On Monday 19 January 2009 00:27:02 Artur Skawina wrote:
>> Artur Skawina wrote:
>>> didn't trigger anything here, just the usual:
>>>
>>> BUG kmalloc-4096: Poison overwritten
>  
>> Still haven't found the corruptor, but at least i've narrowed it down a bit;
>> what i'm seeing is:
>>
>> 1) an skb "S" gets allocated in p54u_rx_cb and is submitted together w/ the urb.
>> 2) "S" later comes back to p54u_rx_cb, where it is given to p54_rx (eventually
>>    ieee80211_rx_irqsafe) and a new one is allocated.
>> 3) a few (~15) rx/tx packets pass.
>> 4) SLUB detects modified poison in what used to be S->head in (1) and (2) above;
>>    usually 0x6b turns into 0x6a, but i have also seen 0x69, just a few times.
>>    (the offset from skb->head to the decremented byte seems to stay the same,
>>    at least during the few times i tried w/ the same kernel, last one was eg
>>    684 bytes)
>>
>> This is almost 100% reproducible; sometimes the machine freezes instead.
> 
> Do you know what is inside "S" when it handed over to ieee80211_rx_irqsafe?
> Is it always the same content, or is it sometimes a data or mgmt frame?

Last time the urb was 88 bytes, that would make the packet <=72 bytes; i didn't
log the content. will do.

> Another shot in the dark: do you have a daemon that listen to mon.wlan0, wmaster / "any" other than hostapd?

I usually have tcpdump listening on wlan0, nothing else (other than dhcpd).

artur
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