From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from fmmailgate02.web.de ([217.72.192.227]:45777 "EHLO fmmailgate02.web.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753220AbZASA0w (ORCPT ); Sun, 18 Jan 2009 19:26:52 -0500 From: Christian Lamparter To: Artur Skawina Subject: Re: wireless-testing, p54 and sinus 154 data no longer works Date: Mon, 19 Jan 2009 01:26:58 +0100 Cc: Johannes Berg , Larry Finger , linux-wireless@vger.kernel.org References: <494698AF.4020204@gmail.com> <497105D1.5040906@gmail.com> <4973BAC6.5020502@gmail.com> In-Reply-To: <4973BAC6.5020502@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Message-Id: <200901190126.58392.chunkeey@web.de> (sfid-20090119_012658_530151_B2A237BA) Sender: linux-wireless-owner@vger.kernel.org List-ID: 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? Another shot in the dark: do you have a daemon that listen to mon.wlan0, wmaster / "any" other than hostapd? Regards, Chr