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:   Mon, 20 Feb 2017 15:05:38 +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 07:05:20PM +0100, Pavel Machek wrote:
> Hi!
> 
> > > 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!
> 
> Happens on x86-64, too; I'm running that normally, but for testing,
> 32-bit kernel is easier.

Ah! And you've seen that on only one machine? What kind machine is it?

Ideally I would need a dump of all pending timer list timers (no sysrq key
for that though, but I can do a quick patch) and a stacktrace of all
tasks. But I guess you have no access to any serial port, right?

> 
> thinkpad x60 works fine for me, so it is unlikely that .config is all
> it takes...

Yeah I booted the .config and it reached the root filesystem mounting
without problem. So I think it's specific to some hardware.