From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from hera.kernel.org ([140.211.167.34]:36736 "EHLO hera.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932549Ab0KRSEe (ORCPT ); Thu, 18 Nov 2010 13:04:34 -0500 Message-ID: <4CE56AAB.7080507@kernel.org> Date: Thu, 18 Nov 2010 19:04:27 +0100 From: Tejun Heo MIME-Version: 1.0 To: Ben Greear 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> In-Reply-To: <4CE56892.9090606@candelatech.com> Content-Type: text/plain; charset=UTF-8 Sender: linux-wireless-owner@vger.kernel.org List-ID: 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. Thanks. -- tejun