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

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Message-ID: <20080127124244.GA24999@elte.hu>
Date:	Sun, 27 Jan 2008 13:42:44 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Kevin Winchester <kjwinchester@...il.com>
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


* 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.

	Ingo
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