From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <linux-kernel-owner+w=401wt.eu-S1760412AbYA0XMu@vger.kernel.org>
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
	id S1760412AbYA0XMu (ORCPT <rfc822;w@1wt.eu>);
	Sun, 27 Jan 2008 18:12:50 -0500
Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754784AbYA0XMm
	(ORCPT <rfc822;linux-kernel-outgoing>);
	Sun, 27 Jan 2008 18:12:42 -0500
Received: from py-out-1112.google.com ([64.233.166.178]:2303 "EHLO
	py-out-1112.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org
	with ESMTP id S1754732AbYA0XMl (ORCPT
	<rfc822;linux-kernel@vger.kernel.org>);
	Sun, 27 Jan 2008 18:12:41 -0500
DomainKey-Signature: a=rsa-sha1; c=nofws;
        d=gmail.com; s=gamma;
        h=date:from:to:cc:subject:message-id:in-reply-to:references:x-mailer:mime-version:content-type:content-transfer-encoding;
        b=lEPO54hvcUTglpne0PEOI1FyuhFnHlujS8GeRAN8JH4czu72SCZ0UYqSC3AfDzVnv7MIo2XBREsHNIznZHUHFaz2oAPqiaH0+jB0UZhuwCDS9hA0q713sPaStRSOrkCFFrEzUruMWgyQ7eBrchfiibG0HnYB20eVYvfRb7rS7i4=
Date: Sun, 27 Jan 2008 19:12:38 -0400
From: Kevin Winchester <kjwinchester@gmail.com>
To: Ingo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>, "H. Peter Anvin" <hpa@zytor.com>,
       Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
       John Stultz <johnstul@us.ibm.com>
Subject: Re: X fails to start with latest Linus git
Message-Id: <20080127191238.92d95770.kjwinchester@gmail.com>
In-Reply-To: <20080127124244.GA24999@elte.hu>
References: <479BCE03.6070603@gmail.com>
	<479BD1D1.8020503@gmail.com>
	<20080127062703.GA23444@elte.hu>
	<20080127083129.c14452ca.kjwinchester@gmail.com>
	<20080127123702.GB21282@elte.hu>
	<20080127124120.GA23377@elte.hu>
	<20080127124244.GA24999@elte.hu>
X-Mailer: Sylpheed 2.4.5 (GTK+ 2.12.0; i486-pc-linux-gnu)
Mime-Version: 1.0
Content-Type: text/plain; charset=US-ASCII
Content-Transfer-Encoding: 7bit
Sender: linux-kernel-owner@vger.kernel.org
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

On Sun, 27 Jan 2008 13:42:44 +0100
Ingo Molnar <mingo@elte.hu> wrote:

> 
> * Ingo Molnar <mingo@elte.hu> wrote:
> 
> > hm, perhaps it's due to the xtime lock dependency:
> > 
> >         do {
> >                 seq = read_seqbegin(&xtime_lock);
> >                 getnstimeofday(ts);
> >                 tomono = wall_to_monotonic;
> > 
> >         } while (read_seqretry(&xtime_lock, seq));
> > 
> > perhaps your system somehow generates a printk from within an 
> > xtime_lock locked section?
> 
> i _bet_ it's these printks that cause your lockup:
> 
>  [   10.313437] Marking TSC unstable due to: cpufreq changes.
>  [   10.313437] Time: hpet clocksource has been installed.
>  [   10.424431] Clocksource tsc unstable (delta = -121609771 ns)
> 
> as these are done with the xtime lock held.
> 

Ok, I'll try disabling cpufreq to see if that prevents the lockup.  If
that is the problem, what is the fix?  Just to keep the path reverted?

-- 
Kevin Winchester <kjwinchester@gmail.com>