Re: [PATCH 1/2] x86: mce: kdump: use under_crashdumping to turn off MCE in all CPUs together

From: Borislav Petkov
Date: Mon Feb 23 2015 - 12:08:11 EST

On Tue, Feb 24, 2015 at 12:41:11AM +0900, Naoya Horiguchi wrote:
> What I saw was that once in hundreds of kdump and reboot cycle we hit
> kdump failure and panic with "Timeout synchronizing machine check over
> CPUs" message.

Ok, but this doesn't necessarily mean you're seeing an MCE.

Or perhaps your NMI shooting down is causing an MCE once in a hundred
kdump cycles, i.e. I'm looking at nmi_shootdown_cpus().

Can you send me a dmesg from such a case where this happens? The more
verbose, the better.



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