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Subject: Re: OOPS at ieee80211_aes_ccm_encrypt()?
From: Johannes Berg <johannes@sipsolutions.net>
To: Jussi Kivilinna <jussi.kivilinna@mbnet.fi>
Cc: linux-wireless@vger.kernel.org
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Date: Mon, 03 Jan 2011 19:16:14 +0100
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On Mon, 2011-01-03 at 20:11 +0200, Jussi Kivilinna wrote:
> Quoting Johannes Berg <johannes@sipsolutions.net>:
> 
> >
> > It looks like it. Can you reproduce this fairly easily? I wonder if it's
> > an RCU problem, we do key lookups under RCU but I see no grace period
> > right now ... try the patch below, I'll look into it in more detail.
> >
> 
> I have been running tests past two weeks and this came up once. I have  
> been running hostapd with wpa_group_rekey=30 and wpa_ptk_rekey=60 and  
> doing 'nc < /dev/zero > /dev/null' at both ends and 'ping -f'. When  
> this crash happened other end was rndis_wlan. I'll try reproducing,  
> but doubt it will.

Alright, thanks. In the meantime, I dug through the code and history and
saw that there was a synchronize_rcu that I accidentally removed, so
I'll just send out the patch with more commentary.

johannes