Re: Current mainline git (24e700e291d52bd2) hangs when building e.g. perf

From: Markus Trippelsdorf <markus@trippelsdorf.de>
To: Borislav Petkov <bp@alien8.de>
Cc: Andy Lutomirski <luto@kernel.org>, Ingo Molnar <mingo@kernel.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	Peter Zijlstra <peterz@infradead.org>,
	LKML <linux-kernel@vger.kernel.org>,
	Ingo Molnar <mingo@redhat.com>,
	Tom Lendacky <thomas.lendacky@amd.com>
Subject: Re: Current mainline git (24e700e291d52bd2) hangs when building e.g. perf
Date: Sat, 9 Sep 2017 08:39:08 +0200	[thread overview]
Message-ID: <20170909063908.GA277@x4> (raw)
In-Reply-To: <20170908215656.qw66lgfsfgpoqrdm@pd.tnic>

On 2017.09.08 at 23:56 +0200, Borislav Petkov wrote:
> On Fri, Sep 08, 2017 at 02:47:00PM -0700, Andy Lutomirski wrote:
> > Any chance you could test with CONFIG_DEBUG_VM=y?  There are lots of
> > potentially useful assertions in that code.
> > 
> > Can you also post your /proc/cpuinfo?  And can you re-confirm that a
> > problematic guest kernel is causing problems in the *host*?
> 
> Also, have you seen any MCEs during early boot, after the freezes?
> 
> You probably wouldn't have because we don't log them on F10h due to
> broken BIOSen. So add "mce=bootlog" to your grub and warm-reset your box
> after one of those freezes and send me dmesg. It should have an MCE in
> there, if it happens what I think it happens.

Unfortunately the machine hangs in the BIOS after the first warm-reset.
Probably when it encounters an MCE it doesn't expect. I have to
warm-reset a second time to get to the boot-loader. So it is impossible
for me to see any possible MCE.

-- 
Markus