Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755719AbbBPPMd (ORCPT ); Mon, 16 Feb 2015 10:12:33 -0500 Received: from service87.mimecast.com ([91.220.42.44]:35968 "EHLO service87.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753227AbbBPPMc convert rfc822-to-8bit (ORCPT ); Mon, 16 Feb 2015 10:12:32 -0500 Message-ID: <54E208EC.6010909@arm.com> Date: Mon, 16 Feb 2015 15:12:44 +0000 From: Juri Lelli User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.4.0 MIME-Version: 1.0 To: Peter Zijlstra , Kirill Tkhai CC: Fengguang Wu , Ingo Molnar , LKP , "linux-kernel@vger.kernel.org" Subject: Re: [sched/deadline] kernel BUG at kernel/sched/deadline.c:805! References: <20150216072038.GA17056@wfg-t540p.sh.intel.com> <9846861424087552@web13j.yandex.ru> <1374601424090314@web4j.yandex.ru> <20150216130821.GB5029@twins.programming.kicks-ass.net> <20150216144412.GS24151@twins.programming.kicks-ass.net> In-Reply-To: <20150216144412.GS24151@twins.programming.kicks-ass.net> X-OriginalArrivalTime: 16 Feb 2015 15:12:27.0762 (UTC) FILETIME=[F9EF8520:01D049FA] X-MC-Unique: 115021615123000601 Content-Type: text/plain; charset=WINDOWS-1252 Content-Transfer-Encoding: 8BIT Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1226 Lines: 34 Hi, On 16/02/15 14:44, Peter Zijlstra wrote: > On Mon, Feb 16, 2015 at 02:08:21PM +0100, Peter Zijlstra wrote: >> On Mon, Feb 16, 2015 at 03:38:34PM +0300, Kirill Tkhai wrote: >>> We shouldn't enqueue migrating tasks. Please, try this one instead ;) >> >> Ha, we should amend that task-rq-lock loop for that. See below. >> >> I've not yet tested; going to try and reconstruct a .config that >> triggers the oops. > > OK, I had to remove -enable-kvm from Wu's script, otherwise the test > would not hit the CBS limit, and then I had to remove the panic on > softlockup because well, qemu is so slow you're going to hit that :-) > > But the good news is that I could reproduce and this patch does indeed > seem to solve it. > I also tested this on top of tip, with kvm actually. So, 1019a359d3dc seemed to reintroduce what aee38ea95419 "sched/deadline: Fix races between rt_mutex_setprio() and dl_task_timer()" fixed. But, this patch seems to fix it again :). Thanks, - Juri -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/