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

From: Frederic Weisbecker <fweisbec@gmail.com>
To: Pavel Machek <pavel@ucw.cz>
Cc: Thomas Gleixner <tglx@linutronix.de>,
	wanpeng.li@hotmail.com, Peter Zijlstra <peterz@infradead.org>,
	Rik van Riel <riel@redhat.com>,
	Linux Kernel Mailing List <linux-kernel@vger.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
Date: Mon, 20 Feb 2017 15:05:38 +0100	[thread overview]
Message-ID: <20170220140526.GA2771@lerouge> (raw)
In-Reply-To: <20170218180520.GA9377@amd>

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.