linux-kernel - Re: iwlagn + some accesspoint = hardlock

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Date:	Fri, 30 Apr 2010 15:17:00 +0200
From:	Lukas Grässlin <lukasgraesslin@....de>
To:	Nils Radtke <Nils.Radtke@...nk-Future.de>
CC:	linux-kernel@...r.kernel.org
Subject: Re: iwlagn + some accesspoint = hardlock

Hi there,

I have _exactely_ the same problem as you.

=> http://www.mail-archive.com/arch-general@archlinux.org/msg12865.html

The strange thing here also is that I mostly only get these freezes when
I'm sitting on my veranda with the thinkpad via wlan. When I'm inside
the house I have no freezes.

This is very very strange, but I happy, that I'm not the only one with
this problem.

Would be nice if you have any news if you let me know,

Regards,
	Lukas

On 22.04.2010 11:39, Nils Radtke wrote:
>   Hello there,
> 
>  today a somewhat unprecise report:
> 
> When connecting to the local university's wireless APs, rather regularly 
> presumably the kernel crashes.
> 
> So, connecting to one of those the system hardlocks. No panic LED blinking, no mouse cursor moving, 
> no magic sysreq key working. Poweroff is the only way to revive the machine. Until the upcoming
> lock-up.
> 
> What might serve as a hint: using knemo and kwifimanager (with wpa_supplicant in the bg) it feels like it is 
> freezing more frequently. Not running kwifimanager seems to reduce the frequency w/o however eliminating it
> completely. Sometimes iceweasel has been touched and then the crash occurred. 
> Maybe some TX (or subsequent RX) provokes the crash? Some idea that also came up was that accessing iwlagn 
> drivers isn't clean when it's happening from more that one place at the same time 
> (->wpa_supplicant + kwifimanager)?
> 
> This behaviour is currently only known to happen in this exact place/location. So one assumption is that it
> is somehow correlated to a particular type of access point, firmware respectively. Nonetheless, even
> if there's some fw sending kill packets, the kernel should not crash, obviously.
> 
> The access points in range are of type:
> 
> - one 0:1d:8b PIRELLI BROADBAND SOLUTIONS 
> - couple of those 0:40:96 Cisco Systems, Inc.
> - one 0:1a:70 Cisco-Linksys
> 
> This notebook has no serial port, so we haven't been able to get a glimpse on what is happening at that 
> precise moment. xconsole or dmesg haven't been helpful as the system just freezes and that's it.
> 
> Comments, ideas, fixes welcome...
> 
> Cheers,
> 
>   Nils
> 
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-- 
Lukas Grässlin
GnuPG-Key: http://lg.ath.cx/lukasgraesslin@gmx.de.asc
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