linux-kernel - Re: [Patch V2] x86, mce: Ensure offline CPU's don't participate in mce rendezvous process.

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Date:	Tue, 8 Dec 2015 00:25:24 +0100
From:	Borislav Petkov <bp@...en8.de>
To:	"Raj, Ashok" <ashok.raj@...el.com>
Cc:	"Luck, Tony" <tony.luck@...el.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-edac@...r.kernel.org" <linux-edac@...r.kernel.org>
Subject: Re: [Patch V2] x86, mce: Ensure offline CPU's don't participate in
 mce rendezvous process.

On Mon, Dec 07, 2015 at 06:46:40PM -0500, Raj, Ashok wrote:
> On Mon, Dec 07, 2015 at 11:34:27PM +0100, Borislav Petkov wrote:
> > 
> > Box logs below.
> 
> Do you have the dmidecode strings to find which platform this is?

Is this enough or you want complete dmidecode dump?

DMI: Intel Corporation LH Pass/S4600LH...., BIOS SE5C600.86B.99.99.2050.043020121425 04/30/2012

> Not sure how the fix works.. since we excluded only the ones offline.
> So unless all online cpu's check in, the code should give you the old
> behavior.

Did you miss my statement in my previous mail where I said that the MCE
is being raised only on the cores of node 0?

> What does cat /proc/interrupts | grep MCE 

Can't. Shell on the box is dead after the injection.

> In a system broadcasting, all cpu counts should be the same. Since we didn't 
> increment the offline stats, if you were to bring the cpu up, it should be one
> less than other cpus...

See the logs at the end of my previous email. #MC gets raised - or at
least output from mce_panic() comes out only - on the cores of node 0.

-- 
Regards/Gruss,
    Boris.

ECO tip #101: Trim your mails when you reply.
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