Re: v4.10-rc8 (-rc6) boot regression on Intel desktop, does not boot after cold boots, boots after reboot

From	Thomas Gleixner <tglx@linutronix.de>
Newsgroups	linux.kernel
Subject	Re: v4.10-rc8 (-rc6) boot regression on Intel desktop, does not boot after cold boots, boots after reboot
Date	2017-02-17 17:40 +0100
Message-ID	<tbTJE-6GS-5@gated-at.bofh.it> (permalink)
References	(6 earlier) <tbyOR-1GL-1@gated-at.bofh.it> <tbyYy-1KY-25@gated-at.bofh.it> <tbz8e-1OZ-29@gated-at.bofh.it> <tbA4i-2sg-15@gated-at.bofh.it> <tbRou-5iA-19@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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On Fri, 17 Feb 2017, Frederic Weisbecker wrote:
> On Thu, Feb 16, 2017 at 08:34:45PM +0100, Thomas Gleixner wrote:
> > On Thu, 16 Feb 2017, Frederic Weisbecker wrote:
> > > On Thu, Feb 16, 2017 at 10:20:14AM -0800, Linus Torvalds wrote:
> > > > On Thu, Feb 16, 2017 at 10:13 AM, Frederic Weisbecker
> > > > <fweisbec@gmail.com> wrote:
> > > > >
> > > > > I haven't followed the discussion but this patch has a known issue which is fixed
> > > > > with:
> > > > >     7bdb59f1ad474bd7161adc8f923cdef10f2638d1
> > > > >     "tick/nohz: Fix possible missing clock reprog after tick soft restart"
> > > > >
> > > > > I hope this fixes your issue.
> > > > 
> > > > No, Pavel saw the problem with rc8 too, which already has that fix.
> > > > 
> > > > So I think we'll just need to revert that original patch (and that
> > > > means that we have to revert the commit you point to as well, since
> > > > that ->next_tick field was added by the original commit).
> > > 
> > > Aw too bad, but indeed that late we don't have the choice.
> > 
> > Hint: Look for CPU hotplug interaction of these patches. I bet something
> > becomes stale when the CPU goes down and does not get reset when it comes
> > back online.
> 
> Indeed I should check that. But Pavel is seeing this on boot, where the

I don't think so. He observed it on suspend resume and by doing hotplug
operations in a loop. But I might be wrong as usual.

> only hotplug operations that happen are CPU UP without preceding CPU DOWN
> that may have retained stale values. I think the value of ts->next_tick should
> be initially 0 for all CPUs. So perhaps that 0 value confuses stuff. But
> looking at the code I don't see how. It maybe something more subtle.
>

Thread

Re: v4.10-rc8 (-rc6) boot regression on Intel desktop, does not boot  after cold boots, boots after reboot Pavel Machek <pavel@ucw.cz> - 2017-02-14 19:10 +0100
  Re: v4.10-rc8 (-rc6) boot regression on Intel desktop, does not boot  after cold boots, boots after reboot Pavel Machek <pavel@ucw.cz> - 2017-02-14 20:30 +0100
    Re: v4.10-rc8 (-rc6) boot regression on Intel desktop, does not boot  after cold boots, boots after reboot Alan Stern <stern@rowland.harvard.edu> - 2017-02-14 21:00 +0100
    Re: v4.10-rc8 (-rc6) boot regression on Intel desktop, does not boot  after cold boots, boots after reboot Frederic Weisbecker <fweisbec@gmail.com> - 2017-02-23 17:30 +0100
      Re: v4.10-rc8 (-rc6) boot regression on Intel desktop, does not boot  after cold boots, boots after reboot Pavel Machek <pavel@ucw.cz> - 2017-02-23 19:50 +0100
        Re: v4.10-rc8 (-rc6) boot regression on Intel desktop, does not boot  after cold boots, boots after reboot Frederic Weisbecker <fweisbec@gmail.com> - 2017-02-25 04:30 +0100
  Re: v4.10-rc8 (-rc6) boot regression on Intel desktop, does not boot  after cold boots, boots after reboot Pavel Machek <pavel@ucw.cz> - 2017-02-15 18:30 +0100
    Re: v4.10-rc8 (-rc6) boot regression on Intel desktop, does not boot  after cold boots, boots after reboot Pavel Machek <pavel@ucw.cz> - 2017-02-16 00:30 +0100
      Re: v4.10-rc8 (-rc6) boot regression on Intel desktop, does not boot  after cold boots, boots after reboot Linus Torvalds <torvalds@linux-foundation.org> - 2017-02-16 00:40 +0100
        Re: v4.10-rc8 (-rc6) boot regression on Intel desktop, does not boot  after cold boots, boots after reboot Pavel Machek <pavel@ucw.cz> - 2017-02-16 12:20 +0100
          Re: v4.10-rc8 (-rc6) boot regression on Intel desktop, does not boot  after cold boots, boots after reboot Pavel Machek <pavel@ucw.cz> - 2017-02-16 18:30 +0100
            Re: v4.10-rc8 (-rc6) boot regression on Intel desktop, does not boot  after cold boots, boots after reboot Frederic Weisbecker <fweisbec@gmail.com> - 2017-02-16 19:20 +0100
              Re: v4.10-rc8 (-rc6) boot regression on Intel desktop, does not boot  after cold boots, boots after reboot Linus Torvalds <torvalds@linux-foundation.org> - 2017-02-16 19:30 +0100
                Re: v4.10-rc8 (-rc6) boot regression on Intel desktop, does not boot  after cold boots, boots after reboot Frederic Weisbecker <fweisbec@gmail.com> - 2017-02-16 19:40 +0100
                Re: v4.10-rc8 (-rc6) boot regression on Intel desktop, does not boot  after cold boots, boots after reboot Thomas Gleixner <tglx@linutronix.de> - 2017-02-16 20:40 +0100
                Re: v4.10-rc8 (-rc6) boot regression on Intel desktop, does not boot  after cold boots, boots after reboot Pavel Machek <pavel@ucw.cz> - 2017-02-16 21:10 +0100
                Re: v4.10-rc8 (-rc6) boot regression on Intel desktop, does not boot  after cold boots, boots after reboot Linus Torvalds <torvalds@linux-foundation.org> - 2017-02-16 21:30 +0100
                Re: v4.10-rc8 (-rc6) boot regression on Intel desktop, does not boot  after cold boots, boots after reboot Pavel Machek <pavel@ucw.cz> - 2017-02-16 21:50 +0100
                Re: v4.10-rc8 (-rc6) boot regression on Intel desktop, does not boot  after cold boots, boots after reboot Pavel Machek <pavel@ucw.cz> - 2017-02-18 10:00 +0100
                Re: v4.10-rc8 (-rc6) boot regression on Intel desktop, does not boot  after cold boots, boots after reboot Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-02-17 02:20 +0100
                Re: v4.10-rc8 (-rc6) boot regression on Intel desktop, does not boot  after cold boots, boots after reboot Frederic Weisbecker <fweisbec@gmail.com> - 2017-02-17 15:10 +0100
                Re: v4.10-rc8 (-rc6) boot regression on Intel desktop, does not boot  after cold boots, boots after reboot Thomas Gleixner <tglx@linutronix.de> - 2017-02-17 17:40 +0100
                Re: v4.10-rc8 (-rc6) boot regression on Intel desktop, does not boot  after cold boots, boots after reboot Pavel Machek <pavel@ucw.cz> - 2017-02-17 18:10 +0100
                Re: v4.10-rc8 (-rc6) boot regression on Intel desktop, does not boot  after cold boots, boots after reboot Frederic Weisbecker <fweisbec@gmail.com> - 2017-02-17 19:50 +0100
                next_tick hang was Re: v4.10-rc8 (-rc6) boot regression on Intel  desktop, does not boot after cold boots, boots after reboot Pavel Machek <pavel@ucw.cz> - 2017-02-18 10:40 +0100
                Re: next_tick hang was Re: v4.10-rc8 (-rc6) boot regression on Intel  desktop, does not boot after cold boots, boots after reboot Frederic Weisbecker <fweisbec@gmail.com> - 2017-02-18 16:00 +0100
                Re: next_tick hang was Re: v4.10-rc8 (-rc6) boot regression on Intel  desktop, does not boot after cold boots, boots after reboot Pavel Machek <pavel@ucw.cz> - 2017-02-18 19:10 +0100
                Re: next_tick hang was Re: v4.10-rc8 (-rc6) boot regression on Intel  desktop, does not boot after cold boots, boots after reboot Frederic Weisbecker <fweisbec@gmail.com> - 2017-02-20 15:10 +0100
                Re: next_tick hang was Re: v4.10-rc8 (-rc6) boot regression on Intel  desktop, does not boot after cold boots, boots after reboot Frederic Weisbecker <fweisbec@gmail.com> - 2017-02-22 04:10 +0100
                Re: next_tick hang was Re: v4.10-rc8 (-rc6) boot regression on Intel  desktop, does not boot after cold boots, boots after reboot Pavel Machek <pavel@ucw.cz> - 2017-02-23 15:30 +0100
            Re: v4.10-rc8 (-rc6) boot regression on Intel desktop, does not boot  after cold boots, boots after reboot Pavel Machek <pavel@ucw.cz> - 2017-02-16 20:10 +0100
              Re: v4.10-rc8 (-rc6) boot regression on Intel desktop, does not boot  after cold boots, boots after reboot Frederic Weisbecker <fweisbec@gmail.com> - 2017-02-17 15:50 +0100

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