linux-kernel - Re: [PATCH] x86/mce: Keep quiet in case of broadcasted mce after system panic

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Date:   Mon, 23 Jan 2017 13:51:57 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     Xunlei Pang <xlpang@...hat.com>
Cc:     x86@...nel.org, linux-kernel@...r.kernel.org,
        kexec@...ts.infradead.org, Tony Luck <tony.luck@...el.com>,
        Ingo Molnar <mingo@...hat.com>, Dave Young <dyoung@...hat.com>,
        Prarit Bhargava <prarit@...hat.com>,
        Junichi Nomura <j-nomura@...jp.nec.com>,
        Kiyoshi Ueda <k-ueda@...jp.nec.com>,
        Naoya Horiguchi <n-horiguchi@...jp.nec.com>
Subject: Re: [PATCH] x86/mce: Keep quiet in case of broadcasted mce after
 system panic

On Mon, Jan 23, 2017 at 04:01:51PM +0800, Xunlei Pang wrote:
> We met an issue for kdump: after kdump kernel boots up,
> and there comes a broadcasted mce in first kernel, the

How does that even happen?

Lemme try to understand this correctly: the first kernel gets an
MCE, kdump starts and boots a *whole* kernel and *then* you get the
broadcasted MCE? I have real hard time believing that.

What happened to the approach of clearing CR4.MCE before loading the
kdump kernel, in native_machine_shutdown() or wherever does the kdump
gets loaded...

-- 
Regards/Gruss,
    Boris.

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