Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754310AbaLBRJA (ORCPT ); Tue, 2 Dec 2014 12:09:00 -0500 Received: from mail-qa0-f42.google.com ([209.85.216.42]:63234 "EHLO mail-qa0-f42.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754063AbaLBRI7 convert rfc822-to-8bit (ORCPT ); Tue, 2 Dec 2014 12:08:59 -0500 MIME-Version: 1.0 In-Reply-To: <547dec29.c71f8c0a.33d1.11d9@mx.google.com> References: <20141126225745.GA30346@redhat.com> <20141127225637.GA24019@redhat.com> <547b8a45.6e608c0a.20f9.1002@mx.google.com> <547bbe36.48548c0a.105c.779c@mx.google.com> <20141201191431.GA17385@linux.vnet.ibm.com> <547ccf74.a5198c0a.25de.26d9@mx.google.com> <20141201230813.GE25340@linux.vnet.ibm.com> <547dec29.c71f8c0a.33d1.11d9@mx.google.com> Date: Tue, 2 Dec 2014 09:08:53 -0800 X-Google-Sender-Auth: v5m-KQZ6kV0OVNT8nK1iPsDQPvE Message-ID: Subject: Re: frequent lockups in 3.18rc4 From: Linus Torvalds To: =?UTF-8?Q?D=C3=A2niel_Fraga?= Cc: "Paul E. McKenney" , Linux Kernel Mailing List Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8BIT Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Dec 2, 2014 at 8:43 AM, Dâniel Fraga wrote: > > Linus, Paul and others, I finally got a call trace with > only CONFIG_TREE_PREEMPT_RCU *disabled* using Paul's patch (to trigger > it I compiled PHP with make -j8). So just to verify: Without CONFIG_PREEMPT, things work well for you? But with CONFIG_PREEMPT, you are able to create the rcu_sched stalls both with and without CONFIG_TREE_PREEMPT_RCU? Correct? > Dec 2 14:25:54 tux kernel: [ 8550.791697] INFO: rcu_sched detected stalls on CPUs/tasks: { 4} (detected by 0, t=60002 jiffies, g=112854, c=112853, q=0) Paul? Linus -- 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/