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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, Peter Zijlstra <peterz@infradead.org>,
	Rik van Riel <riel@redhat.com>, "# .39.x" <stable@kernel.org>,
	"linux-pci@vger.kernel.org" <linux-pci@vger.kernel.org>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Alan Stern <stern@rowland.harvard.edu>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	Bjorn Helgaas <bhelgaas@google.com>,
	USB list <linux-usb@vger.kernel.org>
Subject: Re: v4.10-rc8 (-rc6) boot regression on Intel desktop, does not boot after cold boots, boots after reboot
Date: Fri, 17 Feb 2017 17:37:47 +0100 (CET)	[thread overview]
Message-ID: <alpine.DEB.2.20.1702171737020.3536@nanos> (raw)
In-Reply-To: <20170217140449.GA4521@lerouge>

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.
> 

  reply	other threads:[~2017-02-17 16:37 UTC|newest]

Thread overview: 39+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <20170203190414.GA3701@amd>
     [not found] ` <Pine.LNX.4.44L0.1702031415140.1794-100000@iolanthe.rowland.org>
2017-02-03 20:51   ` v4.10-rc6 " Pavel Machek
2017-02-03 21:18     ` Pavel Machek
2017-02-03 21:59       ` Alan Stern
2017-02-03 22:43         ` Pavel Machek
2017-02-04  8:48           ` Pavel Machek
2017-02-04 16:52             ` Pavel Machek
2017-02-12 12:00             ` Pavel Machek
2017-02-14 17:59       ` v4.10-rc8 (-rc6) " Pavel Machek
2017-02-14 19:27         ` Pavel Machek
2017-02-14 19:54           ` Alan Stern
2017-02-23 16:28           ` Frederic Weisbecker
2017-02-23 18:40             ` Pavel Machek
2017-02-25  3:28               ` Frederic Weisbecker
2017-03-18 14:42               ` Frederic Weisbecker
2017-04-03 15:38               ` Frederic Weisbecker
2017-04-03 18:20                 ` Pavel Machek
2017-04-12 15:08                   ` Frederic Weisbecker
2017-04-15 21:34                     ` Pavel Machek
2017-04-20 14:52                       ` Frederic Weisbecker
     [not found]         ` <CA+55aFyYAztA+Onquy9ODeC9_YBL_fXAd-RgeUVUhpsjK81ZVQ@mail.gmail.com>
     [not found]           ` <CA+55aFxU1D0hAPJuhkKaFBByi=8vpw7dJUX=FfpoqnZLWsvxig@mail.gmail.com>
     [not found]             ` <CA+55aFwt6pbt2STzRh1yCdoo7AnCLFqnPkkrYk4_BGFuvT2VCw@mail.gmail.com>
     [not found]               ` <CA+55aFzMiXXw9gqNCMCSc+O5HfcqWHXfqbdtbvcOmAHM9_wNig@mail.gmail.com>
     [not found]                 ` <CA+55aFxuXgsCyMgrRDHdM6BQaej68QoU8TwdM=3LYu9LMBf4fQ@mail.gmail.com>
2017-02-15 17:23                   ` Pavel Machek
2017-02-15 23:20                     ` Pavel Machek
2017-02-15 23:34                       ` Linus Torvalds
2017-02-16 11:11                         ` Pavel Machek
2017-02-16 17:25                           ` Pavel Machek
2017-02-16 18:13                             ` Frederic Weisbecker
2017-02-16 18:20                               ` Linus Torvalds
2017-02-16 18:34                                 ` Frederic Weisbecker
2017-02-16 19:34                                   ` Thomas Gleixner
2017-02-16 20:06                                     ` Pavel Machek
2017-02-16 20:21                                       ` Linus Torvalds
2017-02-16 20:48                                         ` Pavel Machek
2017-02-18  8:55                                         ` Pavel Machek
2017-02-17  1:11                                       ` Greg Kroah-Hartman
2017-02-17 14:04                                     ` Frederic Weisbecker
2017-02-17 16:37                                       ` Thomas Gleixner [this message]
2017-02-17 17:05                                         ` Pavel Machek
2017-02-17 18:43                                           ` Frederic Weisbecker
2017-02-16 19:06                             ` Pavel Machek
2017-02-17 14:40                               ` Frederic Weisbecker

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