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Date: Thu, 16 Feb 2017 20:34:45 +0100 (CET)
From: Thomas Gleixner <tglx@linutronix.de>
To: Frederic Weisbecker <fweisbec@gmail.com>
cc: Linus Torvalds <torvalds@linux-foundation.org>,
        Pavel Machek <pavel@ucw.cz>, wanpeng.li@hotmail.com,
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Subject: Re: v4.10-rc8 (-rc6) boot regression on Intel desktop, does not boot
 after cold boots, boots after reboot
In-Reply-To: <20170216183421.GC4357@lerouge>
Message-ID: <alpine.DEB.2.20.1702162033200.4049@nanos>
References: <CA+55aFwt6pbt2STzRh1yCdoo7AnCLFqnPkkrYk4_BGFuvT2VCw@mail.gmail.com> <CA+55aFzMiXXw9gqNCMCSc+O5HfcqWHXfqbdtbvcOmAHM9_wNig@mail.gmail.com> <CA+55aFxuXgsCyMgrRDHdM6BQaej68QoU8TwdM=3LYu9LMBf4fQ@mail.gmail.com> <20170215172303.GA15696@amd>
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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.

Thanks,

	tglx