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Date:   Sat, 9 Sep 2017 08:39:08 +0200
From:   Markus Trippelsdorf <>
To:     Borislav Petkov <>
Cc:     Andy Lutomirski <>, Ingo Molnar <>,
        Thomas Gleixner <>,
        Peter Zijlstra <>,
        LKML <>,
        Ingo Molnar <>,
        Tom Lendacky <>
Subject: Re: Current mainline git (24e700e291d52bd2) hangs when building e.g.

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.


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