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

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Date:   Thu, 23 Feb 2017 15:22:59 +0100
From:   Pavel Machek <pavel@....cz>
To:     Frederic Weisbecker <fweisbec@...il.com>
Cc:     Thomas Gleixner <tglx@...utronix.de>, wanpeng.li@...mail.com,
        Peter Zijlstra <peterz@...radead.org>,
        Rik van Riel <riel@...hat.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: next_tick hang was Re: v4.10-rc8 (-rc6) boot regression on Intel
 desktop, does not boot after cold boots, boots after reboot

On Wed 2017-02-22 04:08:58, Frederic Weisbecker wrote:
> On Sat, Feb 18, 2017 at 11:23:39AM +0100, Pavel Machek wrote:
> > On Sat 2017-02-18 10:39:17, Pavel Machek wrote:
> > > Hi!
> > > 
> > > [I droped some CCs here, you may want to check the CC list].
> > > 
> > > > > 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, is there any chance you could apply this patch on top of latest linus tree
> > > > and send me your resulting dmesg log? This has the two reverted patches plus some
> > > > debugging code. The amount of printk shouldn't be too big, I tested it home without
> > > > issue.
> > > > 
> > > > If you can't manage to dump the dmesg, please try to take a picture of your screen
> > > > so that I can see the last messages starting with "NEXT_TICK_READ".
> > > > 
> > > > Thanks!
> > > 
> > > I guess I can. But I'll only have one 80x25 screen to look at...
> > 
> > Ok, here it is.
> 
> Thanks, I haven't been able to deduce much though, except that the pending timer on CPU 0
> looks quite far away.
> 
> Could you please add "initcall_debug" in your kernel parameters to identify if we are blocking in
> a specific initcall? If so it should tell us which one.

Please see Re: v4.10-rc8 (-rc6) boot regression on Intel desktop, does
not boot after cold boots, boots after reboot thread. Hang was traced
down to the USB handoff code.
									Pavel

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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