linux-kernel - Re: x86/mce: machine check warning during poweroff

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Date:	Sat, 14 Jan 2012 01:44:59 +0100
From:	Dirk Gouders <gouders@...bocholt.fh-gelsenkirchen.de>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>,
	Ming Lei <tom.leiming@...il.com>,
	Djalal Harouni <tixxdz@...ndz.org>,
	Borislav Petkov <borislav.petkov@....com>,
	Tony Luck <tony.luck@...el.com>,
	Hidetoshi Seto <seto.hidetoshi@...fujitsu.com>,
	Ingo Molnar <mingo@...e.hu>, Andi Kleen <ak@...ux.intel.com>,
	linux-kernel@...r.kernel.org, Greg Kroah-Hartman <gregkh@...e.de>,
	Kay Sievers <kay.sievers@...y.org>,
	Marcos Souza <marcos.mage@...il.com>,
	Linux PM mailing list <linux-pm@...r.kernel.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	"tglx\@linutronix.de" <tglx@...utronix.de>,
	prasad@...ux.vnet.ibm.com, justinmattock@...il.com,
	Jeff Chua <jeff.chua.linux@...il.com>
Subject: Re: x86/mce: machine check warning during poweroff

Linus Torvalds <torvalds@...ux-foundation.org> writes:

> On Fri, Jan 13, 2012 at 12:22 PM, Srivatsa S. Bhat
> <srivatsa.bhat@...ux.vnet.ibm.com> wrote:
>> However, it is to be noted that, technically this warning (machinecheck1
>> not having a release() function) is not all that new. Just that people
>> didn't probably notice it earlier (reason explained below).
>
> .. but there really is some semantic issue going on here. I'm not the
> only one for whom suspend/resume simply does not work with MCE
> enabled, and that "not work" coincides with the switch-over from
> sysdev to struct device.
>
> I suspect it is some subtle difference in sysdev_unregister() vs
> device_unregister(). The message change is just a symptom of the fact
> that we go through different paths.
>
> For me MCE hangs only on the *second* suspend, but it sounds like
> others see it on the first one.

Yes, my laptop hangs on the first suspend.
Another effect of the problem is that the laptop's clock is extremely
off after a forced reboot.

Dirk
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