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

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Message-ID: <20170123145056.fyraeehjfnwmmfb6@pd.tnic>
Date:   Mon, 23 Jan 2017 15:50:56 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     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 09:35:53PM +0800, Xunlei Pang wrote:
> One possible timing sequence would be:
> 1st kernel running on multiple cpus panicked
> then the crash dump code starts
> the crash dump code stops the others cpus except the crashing one
> 2nd kernel boots up on the crash cpu with "nr_cpus=1"
> some broadcasted mce comes on some cpu amongst the other cpus(not the crashing cpu)

Where does this broadcasted MCE come from?

The crash dump code triggered it? Or it happened before the panic()?

Are you talking about an *actual* sequence which you're experiencing on
real hw or is this something hypothetical?

-- 
Regards/Gruss,
    Boris.

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