Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752305AbaB1Vv4 (ORCPT ); Fri, 28 Feb 2014 16:51:56 -0500 Received: from e38.co.us.ibm.com ([32.97.110.159]:57555 "EHLO e38.co.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751711AbaB1Vvz (ORCPT ); Fri, 28 Feb 2014 16:51:55 -0500 Date: Fri, 28 Feb 2014 13:51:50 -0800 From: "Paul E. McKenney" To: Peter Zijlstra Cc: Steven Rostedt , Vince Weaver , "H. Peter Anvin" , Linux Kernel , Ingo Molnar Subject: Re: perf_fuzzer compiled for x32 causes reboot Message-ID: <20140228215150.GM11910@linux.vnet.ibm.com> Reply-To: paulmck@linux.vnet.ibm.com References: <20140227173150.4e5ed747@gandalf.local.home> <530FC1C6.5040209@zytor.com> <20140227183008.6be081b7@gandalf.local.home> <530FCE6C.4080808@zytor.com> <20140228203405.GH11910@linux.vnet.ibm.com> <20140228154716.0198d7cb@gandalf.local.home> <20140228205409.GB14089@laptop.programming.kicks-ass.net> <20140228211733.GK11910@linux.vnet.ibm.com> <20140228212700.GH14089@laptop.programming.kicks-ass.net> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20140228212700.GH14089@laptop.programming.kicks-ass.net> User-Agent: Mutt/1.5.21 (2010-09-15) X-TM-AS-MML: disable X-Content-Scanned: Fidelis XPS MAILER x-cbid: 14022821-1344-0000-0000-00000628A90C Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, Feb 28, 2014 at 10:27:00PM +0100, Peter Zijlstra wrote: > On Fri, Feb 28, 2014 at 01:17:33PM -0800, Paul E. McKenney wrote: > > This code isn't running in idle context is it? If so, RCU will happily > > free out from under it. CONFIG_PROVE_RCU should detect this sort of thing, > > though. > > Well, interrupts/NMIs can happen when idle, but the interrupt/NMI > entry code deals with the idle state AFAIK. Yep, rcu_irq_enter() and rcu_nmi_enter() deal with that. More worried about this being code invoked from some energy-efficiency driver or another within the idle loop. Thanx, Paul -- 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/