Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932500AbaLAUgh (ORCPT ); Mon, 1 Dec 2014 15:36:37 -0500 Received: from mail-qg0-f47.google.com ([209.85.192.47]:39538 "EHLO mail-qg0-f47.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753936AbaLAUgf convert rfc822-to-8bit (ORCPT ); Mon, 1 Dec 2014 15:36:35 -0500 MIME-Version: 1.0 In-Reply-To: <547ccf74.a5198c0a.25de.26d9@mx.google.com> References: <20141126024032.GA13246@redhat.com> <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> Date: Mon, 1 Dec 2014 12:36:34 -0800 X-Google-Sender-Auth: BU29cIVBEWXcU8_qjnK_HKdVBKA Message-ID: Subject: Re: frequent lockups in 3.18rc4 From: Linus Torvalds To: =?UTF-8?Q?D=C3=A2niel_Fraga?= , Dave Jones , Sasha Levin 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 Mon, Dec 1, 2014 at 12:28 PM, Dâniel Fraga wrote: > > Hi Paul. Please, I'd like the patch, because without > preemption, I'm unable to trigger this bug. Ok, that's already interesting information. And yes, it would probably be interesting to see if CONFIG_PREEMPT=y but !CONFIG_TREE_PREEMPT_RCU then solves it too, to narrow it down to one but not the other.. DaveJ - what about your situation? The standard Fedora kernels use CONFIG_PREEMPT_VOLUNTARY, do you have CONFIG_PREEMPT and CONFIG_TREE_PREEMPT_RCU enabled? I think you and Sasha both saw some RCU oddities too, no? 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/