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 - 08:59:45 EST

On Mon, Feb 23, 2015 at 10:01:50PM +0900, Naoya Horiguchi wrote:
> userspace. What end users see is like these timeout messages:
> - "Timeout: Not all CPUs entered broadcast exception handler",
> - "Timeout: Subject CPUs unable to finish machine check processing",
> - "Timeout: Monarch CPU unable to finish machine check processing", or
> - "Timeout: Monarch CPU did not finish machine check processing".
> These are informative for developers like us, but confusing for end users.

Those messages won't go out if tolerant level is > 1 AFAICT and from
looking at mce_timed_out() and the machine wouldn't panic, for that

So what is the actual problem you're seeing?

Cores timeoutting when a machine check happens during entering kdump or
you not wanting cores to panic due to a machine check while the machine
enters kdump?

Something else?


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