From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755022AbZHYQML (ORCPT ); Tue, 25 Aug 2009 12:12:11 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754887AbZHYQML (ORCPT ); Tue, 25 Aug 2009 12:12:11 -0400 Received: from e8.ny.us.ibm.com ([32.97.182.138]:43833 "EHLO e8.ny.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750873AbZHYQMK (ORCPT ); Tue, 25 Aug 2009 12:12:10 -0400 Date: Tue, 25 Aug 2009 09:12:08 -0700 From: "Paul E. McKenney" To: Ingo Molnar Cc: Lai Jiangshan , linux-kernel@vger.kernel.org, dipankar@in.ibm.com, akpm@linux-foundation.org, mathieu.desnoyers@polymtl.ca, josht@linux.vnet.ibm.com, dvhltc@us.ibm.com, niv@us.ibm.com, tglx@linutronix.de, peterz@infradead.org, rostedt@goodmis.org, Paul Mundt Subject: Re: [PATCH -tip 0/2] Temporary RCU fixes for notrace and hotplug CPU Message-ID: <20090825161208.GE6616@linux.vnet.ibm.com> Reply-To: paulmck@linux.vnet.ibm.com References: <20090824164112.GA13693@linux.vnet.ibm.com> <20090825065501.GA29162@elte.hu> <20090825080047.GA16139@elte.hu> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20090825080047.GA16139@elte.hu> User-Agent: Mutt/1.5.15+20070412 (2007-04-11) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Aug 25, 2009 at 10:00:47AM +0200, Ingo Molnar wrote: > > btw., i'm still seeing crashes with the latest RCU bits: > > [ 20.621740] Testing event sys_enter_futex: OK > [ 20.629738] Testing event sys_exit_futex: OK > [ 20.637737] Testing event lock_acquire: [reboot] > > Possibly due to infinite recursion as well. Config attached. Color me confused... Unless someone has a better idea, I will send in a patch that adds "notrace" to every RCU API member used by any file in the kernel that has "trace" in its name (excluding ptrace.c and rcutree_trace.c, of course). This list is as follows: call_rcu() call_rcu_sched() rcu_read_lock() rcu_read_unlock() So, any better ideas? Thanx, Paul