Return-path: Received: from he.sipsolutions.net ([78.46.109.217]:37671 "EHLO sipsolutions.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754085Ab0IWPDs (ORCPT ); Thu, 23 Sep 2010 11:03:48 -0400 Subject: Re: [PATCH] wifi-test: add simple roam test script From: Johannes Berg To: "Luis R. Rodriguez" Cc: "Rafael J. Wysocki" , "jiajia.zheng@intel.com" , "linux-wireless@vger.kernel.org" , "wifi-test-devel@lists.sourceforge.net" , Luis Rodriguez , Paul Stewart In-Reply-To: <1285254157.3770.169.camel@jlt3.sipsolutions.net> References: <1285201037-29405-1-git-send-email-lrodriguez@atheros.com> <20100923002240.GA4484@tux> <1285231958.3691.10.camel@jlt3.sipsolutions.net> <1285254157.3770.169.camel@jlt3.sipsolutions.net> Content-Type: text/plain; charset="UTF-8" Date: Thu, 23 Sep 2010 17:03:46 +0200 Message-ID: <1285254226.3770.171.camel@jlt3.sipsolutions.net> Mime-Version: 1.0 Sender: linux-wireless-owner@vger.kernel.org List-ID: On Thu, 2010-09-23 at 17:02 +0200, Johannes Berg wrote: > On Thu, 2010-09-23 at 07:53 -0700, Luis R. Rodriguez wrote: > > > >> After roaming for a good while, this is what I got, not sure > > >> yet what caused the NULL pointer dereference... Am I the only > > >> one able to reproduce this? > > > > > >> [ 3276.730081] BUG: unable to handle kernel NULL pointer dereference at 0000000000000003 > > >> [ 3276.730148] IP: [<0000000000000003>] 0x3 > > > > > > Something called a NULL pointer function pointer. Rafael recently said > > > "cpuidle is buggy" when a similar issue came up: > > > http://mid.gmane.org/201009182344.12498.rjw@sisk.pl > > > > But that seems related to ACPI, no? On my box I never suspended, I > > just associated and disassociated rapidly between two peers. The only > > suspicion I have is its obviously right after adding the STA peer. > > Yes, but he said suspend/resume _fixed_ it :-) Hm never mind, misunderstood the original report ... suspend + wait + resume was what was broken. But still, it's a NULL pointer call, and I can't really see how that would happen. johannes