Subject: Re: iwlwifi havoc on some APs (rekeying?)
From: Johannes Berg <johannes@sipsolutions.net>
To: Wolfgang Breyha <wbreyha@gmx.net>
Cc: "Guy, Wey-Yi" <wey-yi.w.guy@intel.com>,
	"linux-wireless@vger.kernel.org" <linux-wireless@vger.kernel.org>
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Date: Mon, 12 Dec 2011 10:04:17 +0100
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On Sat, 2011-12-10 at 14:02 +0100, Wolfgang Breyha wrote:
> On 09/12/11 19:26, Johannes Berg wrote:
> > What's "this area"? This isn't exactly the first report of random memory
> > corruption ... I think the last one was something with 32/64 bit but I
> > don't remember.
> 
> To narrow down "this area" I tried the following:
> 
> *) I reconfigured my soekris AP hostapd to use wpa_group_rekey=0
>    .... and it works like a charm since then
> 
> *) I reconfigured the ubiquiti UniFi AP to use wpa_group_rekey=120
>    ... and I'am pretty sure now that it is exactly the second rekeying
>    that starts messing up the system. Exactly after wpa_supplicant logs
> WPA: Group rekeying completed with 06:27:22:xx:xx:xx [GTK=TKIP]
>    the second time, video streaming with VLC immediatly leeds to all the
>    mentioned sideeffects.
> 
> Maybe it's possible to reproduce it with any hostapd based AP with
> active wpa_group_rekey.

Ok, thanks.

Are you running a 32-bit kernel on a 64-bit machine by any chance?
Somebody else reported that using a 64-bit kernel helped similar issues.

johannes