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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20150223135842.GA22753@pd.tnic>
Date:	Mon, 23 Feb 2015 14:58:42 +0100
From:	Borislav Petkov <bp@...en8.de>
To:	Naoya Horiguchi <nao.horiguchi@...il.com>
Cc:	Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
	Tony Luck <tony.luck@...el.com>,
	Vivek Goyal <vgoyal@...hat.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Junichi Nomura <j-nomura@...jp.nec.com>,
	Kiyoshi Ueda <k-ueda@...jp.nec.com>
Subject: Re: [PATCH 1/2] x86: mce: kdump: use under_crashdumping to turn off
 MCE in all CPUs together

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
matter.

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?

-- 
Regards/Gruss,
    Boris.

ECO tip #101: Trim your mails when you reply.
--
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/