Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754660AbZDWI3t (ORCPT ); Thu, 23 Apr 2009 04:29:49 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752652AbZDWI3b (ORCPT ); Thu, 23 Apr 2009 04:29:31 -0400 Received: from mx3.mail.elte.hu ([157.181.1.138]:55469 "EHLO mx3.mail.elte.hu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751552AbZDWI33 (ORCPT ); Thu, 23 Apr 2009 04:29:29 -0400 Date: Thu, 23 Apr 2009 10:28:10 +0200 From: Ingo Molnar To: Steven Rostedt Cc: Jeremy Fitzhardinge , Frederic Weisbecker , LKML , Andrew Morton , Glauber de Oliveira Costa , Chris Wright , Rusty Russell Subject: Re: [PATCH 0/2] [GIT PULL] tracing: various bug fixes Message-ID: <20090423082810.GE599@elte.hu> References: <20090420222257.267399830@goodmis.org> <20090421082354.GC12512@elte.hu> <20090421094616.GA14561@elte.hu> <20090422114750.GA14202@nowhere> <20090422171047.GA5975@nowhere> <49EF5138.3030408@goop.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.18 (2008-05-17) X-ELTE-VirusStatus: clean X-ELTE-SpamScore: -1.5 X-ELTE-SpamLevel: X-ELTE-SpamCheck: no X-ELTE-SpamVersion: ELTE 2.0 X-ELTE-SpamCheck-Details: score=-1.5 required=5.9 tests=BAYES_00 autolearn=no SpamAssassin version=3.2.3 -1.5 BAYES_00 BODY: Bayesian spam probability is 0 to 1% [score: 0.0000] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1841 Lines: 57 * Steven Rostedt wrote: > > On Wed, 22 Apr 2009, Steven Rostedt wrote: > > > > > On Wed, 22 Apr 2009, Jeremy Fitzhardinge wrote: > > > > > > > > > > > > > > > Do you have CONFIG_PARAVIRT on? When I disabled it, I have yet to > > > > > reproduce the bug. But I've only rebooted a few times. I'm going to > > > > > continue to reboot to see if I can trigger it. > > > > > > > > > > > > > > > > > Yes it is enabled. > > > > > > > > > > > > > > > > > > > > > I'm thinking that the paravirt alternative code may have clobbered a > > > > > register in either the enable or disabling of interrupts. This might cause > > > > > a strange value to go into the hardirqs_enabled flag. > > > > > > > > > > > > > > > > > > > > > Ok I will try it without PARAVIRT and tell you if I can reproduce it. > > > > > > > > > > Interesting. What code is generated for native_irq_enable/disable? > > > > Note, when I take my standard config and enable PARAVIRT and LOCKDEP it > > still boots up fine. It may be a combination of some configs :-/ > > > > I'm currently doing a "config bisect" to find out what configs are needed. > > I just finished the config bisect, and it came down to > CONFIG_DEBUG_PAGEALLOC (set is bad, not set is good). I'm sure > this is not the only config that is at issue. It is probably a > combination of configs > :-/ > > I'll try others to see if things change. It could also be the timing of an incoming IRQ to hit a particular race window. PAGEALLOC might trigger the right kind of delays to make it trigger. Ingo -- 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/