Re: v4.10-rc6 boot regression on Intel desktop, does not boot after cold boots, boots after reboot

From: Pavel Machek <pavel@ucw.cz>
To: kernel list <linux-kernel@vger.kernel.org>,
	bhelgaas@google.com, linux-pci@vger.kernel.org,
	tglx@linutronix.de, mingo@redhat.com, hpa@zytor.com,
	x86@kernel.org
Subject: Re: v4.10-rc6 boot regression on Intel desktop, does not boot after cold boots, boots after reboot
Date: Sat, 4 Feb 2017 17:52:49 +0100	[thread overview]
Message-ID: <20170204165248.GA6951@amd> (raw)
In-Reply-To: <20170204084856.GA32381@amd>

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Hi!

> > > > > Aha. So it looks difference is probably in "where is keyboard plugged
> > > > > in" but in "reboot" vs. "cold boot". I did not do a cold boot in quite
> > > > > a while :-(.
> > > > > 
> > > > > Booting to grub, then hitting ctrl-alt-del is enough to make it work. Ouch.
> > > > > 
> > > > > It happens with current Linus' tree.
> > > > 
> > > > v4.10-rc6-feb3 : broken
> > > > v4.9 : ok
> > > > (v4.6 : ok)
> v4.10-rc1 seems to work.

v4.10-rc3: ok
v4.10-rc5: bad, I get some kind of backtrace? Next boot results in
hang. It boots ok twice in between.
v4.10-rc6: ok ?!
34e00accf612bc5448ae709245c2b408edf39f46 : ok?
v4.10-rc6-feb3: ok?! (with config.ok, and with original config. Hmm?)

This machine was pretty reliable (except rowhammer), but I admit their
EC code may leave something to be desired. Sometimes it runs without
power LED lit (usually after strange crashes), sometimes _two_ long
presses are neccessary to power it off.

So... yesterday it hung on cold boot, but not on reboot. Verified 5
times or more. Today, I can't reproduce the hang. Strange :-(.

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

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