Date: Sat, 9 Sep 2017 12:18:10 +0200
From: Borislav Petkov <bp@alien8.de>
To: Markus Trippelsdorf <markus@trippelsdorf.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
Message-ID: <20170909101810.a757cja7vslofyrj@pd.tnic>
References: <20170908091614.nmdxjnukxowlsjja@pd.tnic>
 <20170908094815.GA278@x4>
 <20170908103513.npjmb2kcjt2zljb2@gmail.com>
 <20170908103906.GB278@x4>
 <20170908113039.GA285@x4>
 <CALCETrXkWrQjSqpTQw_vJwN_hRp6eWXEOcibM+57NmC+HWxGNg@mail.gmail.com>
 <20170908171633.GA279@x4>
 <CALCETrX6mFHWa1oZxS7DQUtnbqyrRRg53bvgGFv19ka8Sy_KcA@mail.gmail.com>
 <20170908215656.qw66lgfsfgpoqrdm@pd.tnic>
 <20170909063908.GA277@x4>
MIME-Version: 1.0
Content-Type: text/plain; charset=utf-8
Content-Disposition: inline
In-Reply-To: <20170909063908.GA277@x4>
User-Agent: NeoMutt/20170113 (1.7.2)
Sender: linux-kernel-owner@vger.kernel.org
Content-Length: 948
Lines: 29

On Sat, Sep 09, 2017 at 08:39:08AM +0200, Markus Trippelsdorf wrote:
> 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.

Ok, let's try to disable the syncflood before the test. As root:

# V=$(setpci -s 18.3 0x44.l)
# echo $V
# V=$(printf "0x%x" $((0x$V & ~(1 << 21))))
# setpci -s 18.3 0x44.l=$V
# echo $V

I've added the echo $V so that you can paste them as a reply so that I
can see their values.

And then run the triggering sequence again, better not on an X terminal
but in the text console to see any MCEs when it freezes. I remember you
saying that you don't have serial connected to it so catching the MCE
would need more staring :)

Thx.

-- 
Regards/Gruss,
    Boris.

Good mailing practices for 400: avoid top-posting and trim the reply.