linux-kernel - Re: [boot crash] Re: [tip:x86/mce3] x86, mce: use 64bit machine check code on 32bit

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Message-ID: <4A891E17.1090901@jp.fujitsu.com>
Date:	Mon, 17 Aug 2009 18:08:39 +0900
From:	Hidetoshi Seto <seto.hidetoshi@...fujitsu.com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	linux-kernel@...r.kernel.org, mingo@...hat.com, hpa@...or.com,
	ak@...ux.intel.com, tglx@...utronix.de,
	Yinghai Lu <yinghai@...nel.org>,
	Huang Ying <ying.huang@...el.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	linux-tip-commits@...r.kernel.org
Subject: Re: [boot crash] Re: [tip:x86/mce3] x86, mce: use 64bit machine	check
 code on 32bit

Ingo Molnar wrote:
> * Hidetoshi Seto <seto.hidetoshi@...fujitsu.com> wrote:
>> Could you try boot your laptop with mce=nobootlog?
> 
> Hm, why should that make any difference? mce=nobootlog only 
> influences whether we pass records into the mcelog buffer but does 
> not affect whether we touch the hardware.

Old mce codes doesn't take bootlog.

One possibility is: if the BIOS doesn't clear status in banks,
new mce codes will try to log such junks.
If the junk is totally junk but can be decoded as a valid log with
MISCV or ADDRV bit, and if the cpu try to access register which is
not implemented (e.g. IA32_MCi_MISC/ADDR), then such access might
cause a general protection exception. (ref. ASDM 3A 15.3.2.3)

I'm just guessing...


Thanks,
H.Seto

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