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:   Sat, 18 Feb 2017 15:50:31 +0100
From:   Frederic Weisbecker <fweisbec@...il.com>
To:     Pavel Machek <pavel@....cz>
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 Sat, Feb 18, 2017 at 10:39:17AM +0100, Pavel Machek wrote:
> Hi!
> 
> [I droped some CCs here, you may want to check the CC list].

Good!

> 
> > > 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...
> 
> .config is attached.

Ah this is x86-32, interesting! I'm going to try to boot that, we never know.

Thanks a lot!