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Date: Sat, 9 Sep 2017 12:18:10 +0200
From: Borislav Petkov <bp@...en8.de>
To: Markus Trippelsdorf <markus@...ppelsdorf.de>
Cc: Andy Lutomirski <luto@...nel.org>, Ingo Molnar <mingo@...nel.org>,
Thomas Gleixner <tglx@...utronix.de>,
Peter Zijlstra <peterz@...radead.org>,
LKML <linux-kernel@...r.kernel.org>,
Ingo Molnar <mingo@...hat.com>,
Tom Lendacky <thomas.lendacky@....com>
Subject: Re: Current mainline git (24e700e291d52bd2) hangs when building e.g.
perf
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.
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