linux-kernel - Re: X fails to start with latest Linus git

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Message-Id: <20080127193555.2d1370ad.kjwinchester@gmail.com>
Date:	Sun, 27 Jan 2008 19:35:55 -0400
From:	Kevin Winchester <kjwinchester@...il.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	John Stultz <johnstul@...ibm.com>
Subject: Re: X fails to start with latest Linus git

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

> 
> * Ingo Molnar <mingo@...e.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.
> 

Yes, disabling cpufreq (in my .config since, sadly, there is no command
line option to disable it) fixes the problem.

-- 
Kevin Winchester <kjwinchester@...il.com>
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