Re: X fails to start with latest Linus git

[Ingo Molnar <mingo@elte.hu>]

* 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