From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757443AbYAVWyf (ORCPT ); Tue, 22 Jan 2008 17:54:35 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753963AbYAVWy2 (ORCPT ); Tue, 22 Jan 2008 17:54:28 -0500 Received: from x35.xmailserver.org ([64.71.152.41]:37024 "EHLO x35.xmailserver.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753883AbYAVWy1 (ORCPT ); Tue, 22 Jan 2008 17:54:27 -0500 X-AuthUser: davidel@xmailserver.org Date: Tue, 22 Jan 2008 14:54:25 -0800 (PST) From: Davide Libenzi X-X-Sender: davide@alien.or.mcafeemobile.com To: Stefan Richter cc: Peter Zijlstra , Denys Fedoryshchenko , Linux Kernel Mailing List , Andrew Morton Subject: Re: 2.6.24-rc7 to 2.6.24-rc8 possible regression In-Reply-To: Message-ID: References: <20080121160255.M12670@visp.net.lb> <47952094.9050102@s5r6.in-berlin.de> <20080122110448.M46928@visp.net.lb> <4796189F.8070506@s5r6.in-berlin.de> <1201019283.6341.28.camel@lappy> X-GPG-FINGRPRINT: CFAE 5BEE FD36 F65E E640 56FE 0974 BF23 270F 474E X-GPG-PUBLIC_KEY: http://www.xmailserver.org/davidel.asc MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, 22 Jan 2008, Stefan Richter wrote: > (adding Cc: Davide and akpm) > > On 22 Jan, Peter Zijlstra wrote: > > > > On Tue, 2008-01-22 at 17:23 +0100, Stefan Richter wrote: > >> Denys Fedoryshchenko wrote: > >> > No, i am using vanilla kernel. It is one of production machines, and as i > >> > know screen is not using epoll. > >> > >> OK, but the trace shows that it is the epoll recursion again. > >> > >> > I will try to apply on all my production machines this patch. Sorry if it is > >> > related. > >> > >> Well, let's hope that the lockdep annotation or whatever other fix gets > >> into mainline sooner than later. Which reminds me to test my setup > >> again which appeared to be able to reproduce the __wake_up recursion on > >> my command... > > > > Would be appreciated, I have been waiting on testing feedback because > > I'm not fully certain here. > > > > Curious though that this gets reported frequently the last few weeks, > > afaics this problem is way old. > > Here is a report against Fedora's 2.6.23-0.222.rc9.git4.fc8, filed in > October: https://bugzilla.redhat.com/show_bug.cgi?id=323411 > > I did several tests with a pristine 2.6.24-rc8 now. The lockdep warning > below is 100% reliably triggered by grabbing video from a DV camcorder > with dvgrab v3 via firewire-core's character device file ABI. > > Also, this warning is 100% reliably suppressed by your annotation patch. > I will reply to this message with this patch for kind consideration by > those concerned. :-) Patch? Where is it? - Davide