On Fri 2017-02-17 17:37:47, Thomas Gleixner wrote: > 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@xxxxxxxxx> 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. These are different bugs. On x60, I see failures doing hotplug/unplug in a loop, or lot of suspends. Someone seen it in v4.8-stable etc. Old bug. Rare to hit. Desktop machine was failing to boot, and had some fun with suspend/resume too. Boot hang was reproducible with right procedure. (Hard poweroff, cold boot.). That one was introduced in 4.10-rc cycle. Pavel -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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