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Re: rc5+tip/master: Marking clocksource 'tsc' as unstable because the skew is too large:

From Thomas Gleixner <tglx@linutronix.de>
Newsgroups linux.kernel
Subject Re: rc5+tip/master: Marking clocksource 'tsc' as unstable because the skew is too large:
Date 2016-06-30 13:20 +0200
Message-ID <rPIaK-to-23@gated-at.bofh.it> (permalink)
References (2 earlier) <rPF3b-6QF-5@gated-at.bofh.it> <rPFPA-7mK-47@gated-at.bofh.it> <rPGiC-7LV-21@gated-at.bofh.it> <rPGVj-7Zc-3@gated-at.bofh.it> <rPGVj-7Zc-1@gated-at.bofh.it>
Organization linux.* mail to news gateway

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On Thu, 30 Jun 2016, Mike Galbraith wrote:
> On Thu, 2016-06-30 at 11:42 +0200, Thomas Gleixner wrote:
> 
> > So there was no watchdog firing for 525 seconds ????
> 
> Yup, seems so.

if that's fully reproducible can you please enable the timer and softirq
tracepoints along with your trace printks and stop the trace when that
watchdog triggers?

extra trace printk below.

thanks

	tglx

diff --git a/kernel/time/timer.c b/kernel/time/timer.c
index 3e0c4e60bf6a..418c45ab5ad5 100644
--- a/kernel/time/timer.c
+++ b/kernel/time/timer.c
@@ -1438,6 +1438,7 @@ static unsigned long __next_timer_interrupt(struct timer_base *base)
 		clk >>= LVL_CLK_SHIFT;
 		clk += adj;
 	}
+	trace_printk("next %lu\n", next);
 	return next;
 }
 

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Thread

rc5+tip/master: Marking clocksource 'tsc' as unstable because the  skew is too large: Borislav Petkov <bp@alien8.de> - 2016-06-27 22:10 +0200
  Re: rc5+tip/master: Marking clocksource 'tsc' as unstable because  the skew is too large: Borislav Petkov <bp@alien8.de> - 2016-06-29 19:20 +0200
    Re: rc5+tip/master: Marking clocksource 'tsc' as unstable because  the skew is too large: Mike Galbraith <umgwanakikbuti@gmail.com> - 2016-06-30 10:00 +0200
      Re: rc5+tip/master: Marking clocksource 'tsc' as unstable because  the skew is too large: Thomas Gleixner <tglx@linutronix.de> - 2016-06-30 10:50 +0200
        Re: rc5+tip/master: Marking clocksource 'tsc' as unstable because  the skew is too large: Mike Galbraith <umgwanakikbuti@gmail.com> - 2016-06-30 11:20 +0200
          Re: rc5+tip/master: Marking clocksource 'tsc' as unstable because  the skew is too large: Mike Galbraith <umgwanakikbuti@gmail.com> - 2016-06-30 12:00 +0200
            Re: rc5+tip/master: Marking clocksource 'tsc' as unstable because  the skew is too large: Mike Galbraith <umgwanakikbuti@gmail.com> - 2016-06-30 12:30 +0200
              Re: rc5+tip/master: Marking clocksource 'tsc' as unstable because  the skew is too large: Thomas Gleixner <tglx@linutronix.de> - 2016-06-30 12:40 +0200
            Re: rc5+tip/master: Marking clocksource 'tsc' as unstable because  the skew is too large: Thomas Gleixner <tglx@linutronix.de> - 2016-06-30 13:20 +0200
              Re: rc5+tip/master: Marking clocksource 'tsc' as unstable because  the skew is too large: Mike Galbraith <umgwanakikbuti@gmail.com> - 2016-06-30 15:40 +0200
                Re: rc5+tip/master: Marking clocksource 'tsc' as unstable because  the skew is too large: Thomas Gleixner <tglx@linutronix.de> - 2016-06-30 15:50 +0200
                Re: rc5+tip/master: Marking clocksource 'tsc' as unstable because  the skew is too large: Borislav Petkov <bp@alien8.de> - 2016-06-30 16:30 +0200
                Re: rc5+tip/master: Marking clocksource 'tsc' as unstable because  the skew is too large: Mike Galbraith <umgwanakikbuti@gmail.com> - 2016-06-30 16:40 +0200
                Re: rc5+tip/master: Marking clocksource 'tsc' as unstable because  the skew is too large: Richard Cochran <richardcochran@gmail.com> - 2016-06-30 22:20 +0200
          Re: rc5+tip/master: Marking clocksource 'tsc' as unstable because  the skew is too large: Thomas Gleixner <tglx@linutronix.de> - 2016-06-30 12:20 +0200
    Re: rc5+tip/master: Marking clocksource 'tsc' as unstable because  the skew is too large: Thomas Gleixner <tglx@linutronix.de> - 2016-06-30 10:50 +0200
      Re: rc5+tip/master: Marking clocksource 'tsc' as unstable because  the skew is too large: Borislav Petkov <bp@alien8.de> - 2016-06-30 12:00 +0200

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