Date: Sun, 27 Jan 2008 13:42:44 +0100
From: Ingo Molnar <mingo@elte.hu>
To: Kevin Winchester <kjwinchester@gmail.com>
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: <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>
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* 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.

	Ingo
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