Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1759896AbYHTP2T (ORCPT ); Wed, 20 Aug 2008 11:28:19 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1756075AbYHTP1u (ORCPT ); Wed, 20 Aug 2008 11:27:50 -0400 Received: from hrndva-omtalb.mail.rr.com ([71.74.56.125]:57965 "EHLO hrndva-omtalb.mail.rr.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752903AbYHTP1t (ORCPT ); Wed, 20 Aug 2008 11:27:49 -0400 Date: Wed, 20 Aug 2008 11:27:47 -0400 (EDT) From: Steven Rostedt X-X-Sender: rostedt@gandalf.stny.rr.com To: Eran Liberty cc: Benjamin Herrenschmidt , "Paul E. McKenney" , Mathieu Desnoyers , linux-kernel@vger.kernel.org, linuxppc-dev@ozlabs.org, Steven Rostedt , Scott Wood , Alan Modra , Segher Boessenkool Subject: Re: ftrace introduces instability into kernel 2.6.27(-rc2,-rc3) In-Reply-To: <48AC23F4.80900@extricom.com> Message-ID: References: <48591941.4070408@extricom.com> <48A92E15.2080709@extricom.com> <48A9901B.1080900@redhat.com> <20080818154746.GA26835@Krystal> <48A9AFA7.8080508@freescale.com> <1219110814.8062.2.camel@pasglop> <1219113549.8062.13.camel@pasglop> <1219114600.8062.15.camel@pasglop> <1219119431.8062.35.camel@pasglop> <1219216705.21386.46.camel@pasglop> <48AC1DD8.9080702@extricom.com> <48AC23F4.80900@extricom.com> User-Agent: Alpine 1.10 (DEB 962 2008-03-14) MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1371 Lines: 43 On Wed, 20 Aug 2008, Eran Liberty wrote: > > > > > > > c00bb670: 41 9e 00 50 beq- cr7,c00bb6c0 <__d_lookup+0x13c> > > > c00bb674: 83 de 00 00 lwz r30,0(r30) > > > c00bb678: 2f 9e 00 00 cmpwi cr7,r30,0 > > > c00bb67c: 40 9e ff 98 bne+ cr7,c00bb614 <__d_lookup+0x90> > > > c00bb680: 38 60 00 00 li r3,0 > > > c00bb684: 81 61 00 00 lwz r11,0(r1) > > > c00bb688: 80 0b 00 04 lwz r0,4(r11) > > > c00bb68c: 7d 61 5b 78 mr r1,r11 > > > > > > > [ BUG HERE IF INTERRUPT HAPPENS ] > > > > > > > c00bb690: bb 0b ff e0 lmw r24,-32(r11) > > > c00bb694: 7c 08 03 a6 mtlr r0 > > > c00bb698: 4e 80 00 20 blr > > > > > > > Yep, you have the same bug in your compiler. > > > > -- Steve > > > Hmm... so whats now? Try anothe gcc version ;-) > > Is there a way to prove this scenario is indeed the one that caused the opps? I'm not convinced that this is the bug you were seeing. Do you still get the crash if you disable dynamic ftrace but leave ftrace on? -- Steve -- 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/