From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from mail.candelatech.com ([208.74.158.172]:33544 "EHLO ns3.lanforge.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757851Ab0KRSLI (ORCPT ); Thu, 18 Nov 2010 13:11:08 -0500 Message-ID: <4CE56C38.30500@candelatech.com> Date: Thu, 18 Nov 2010 10:11:04 -0800 From: Ben Greear MIME-Version: 1.0 To: Tejun Heo CC: Johannes Berg , linux-wireless@vger.kernel.org Subject: Re: [PATCH] mac80211: Fix deadlock in ieee80211_do_stop. References: <1289592426-5367-1-git-send-email-greearb@candelatech.com> <1289594998.3736.11.camel@jlt3.sipsolutions.net> <4CDDAA3B.9090007@candelatech.com> <1289596096.3736.13.camel@jlt3.sipsolutions.net> <4CDE699B.70401@kernel.org> <4CE1A344.7040201@candelatech.com> <4CE292F7.4090200@kernel.org> <1289929258.3673.1.camel@jlt3.sipsolutions.net> <4CE396A9.1050908@kernel.org> <1290020005.3777.6.camel@jlt3.sipsolutions.net> <4CE4C8DD.6010806@kernel.org> <51f5dd53c39a77fff4efc1a99b189725@localhost> <4CE4D41F.1080005@kernel.org> <4CE56892.9090606@candelatech.com> <4CE56AAB.7080507@kernel.org> In-Reply-To: <4CE56AAB.7080507@kernel.org> Content-Type: text/plain; charset=UTF-8; format=flowed Sender: linux-wireless-owner@vger.kernel.org List-ID: On 11/18/2010 10:04 AM, Tejun Heo wrote: > Hello, Ben. > > On 11/18/2010 06:55 PM, Ben Greear wrote: >> I understand your desire for a stack dump, but it appears that sysrq-t >> isn't getting everything you want, for whatever reason. > > Can you please try again and investigate why it's not working? If > task dump is not working as expected, there is a much more serious > problem than wireless locking up. > >> Does my explanation of the rtnl deadlock that I posted near the beginning >> of this thread (with some backtraces to back that up) make sense, or >> are my assumptions invalid? > > Yes, it makes sense. At this point, I'm fairly sure that something is > holding the workqueue but I really can't tell anything without proper > stack dump. I'm swamped with work today...but hopefully will get back to this later today or tomorrow. Thanks, Ben > > Thanks. > -- Ben Greear Candela Technologies Inc http://www.candelatech.com