DomainKey-Signature: a=rsa-sha1; c=nofws;
        d=gmail.com; s=gamma;
        h=message-id:date:from:to:subject:cc:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:references;
        b=dXk4r2AMRmIUB+2p+uH1eUvzhfUcKx6LfsfYsujfssKzlMMbj6mWq33IzZM9T4CDtMUPPLrqMCPpW2k28HnNdKJVCAizBwYnvGDCulLPRS9ROaqe/DvnkNRNbGx4toP/3PKiIoine5sRwLqnjDzVNVTxDOVCY+G6hhXtB5YwjSc=
Message-ID: <86802c440802141538m44d64b6as827426174874979d@mail.gmail.com>
Date: Thu, 14 Feb 2008 15:38:13 -0800
From: "Yinghai Lu" <yhlu.kernel@gmail.com>
To: "Greg KH" <gregkh@suse.de>, "Ingo Molnar" <mingo@elte.hu>
Subject: Re: [2.6.25-rc1] System no longer powers off after shutdown
Cc: "Frans Pop" <elendil@planet.nl>, linux-kernel@vger.kernel.org,
       linux-acpi@vger.kernel.org
In-Reply-To: <20080213165837.GA10129@suse.de>
MIME-Version: 1.0
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: 7bit
Content-Disposition: inline
References: <200802111623.38478.elendil@planet.nl>
	 <200802122139.14840.elendil@planet.nl>
	 <20080212205622.GA21986@suse.de>
	 <200802131239.14305.elendil@planet.nl>
	 <20080213165837.GA10129@suse.de>
Sender: linux-kernel-owner@vger.kernel.org
Content-Length: 2849
Lines: 73

On Wed, Feb 13, 2008 at 8:58 AM, Greg KH <gregkh@suse.de> wrote:
>
> On Wed, Feb 13, 2008 at 12:39:13PM +0100, Frans Pop wrote:
>  > On Tuesday 12 February 2008, Greg KH wrote:
>  > > On Tue, Feb 12, 2008 at 09:39:14PM +0100, Frans Pop wrote:
>  > > > On Monday 11 February 2008, Frans Pop wrote:
>  > > > > In general 2.6.25 if looking quite good on my desktop, but there's
>  > > > > one important issue: the system no longer powers off after shutdown.
>  > > > > This works fine with 2.6.24.
>  > > >
>  > > > Don't ask me why, but bisection shows this commit to be the cause of
>  > > > the failure to power off:
>  > > > commit c10997f6575f476ff38442fa18fd4a0d80345f9d
>  > > > Author: Greg Kroah-Hartman <gregkh@suse.de>
>  > > > Date:   Thu Dec 20 08:13:05 2007 -0800
>  > > >
>  > > >     Kobject: convert drivers/* from kobject_unregister() to
>  > > > kobject_put()
>  > > >
>  > > > Because it seemed somewhat unlikely, I have double checked this by
>  > > > doing an extra compilation for this commit and its predecessor.
>  > >
>  > > What is the symptom of not powering off?
>  >
>  > I already noticed yesterday that there's one hunk in that commit that's not
>  > a straight replacement:
>  > diff --git a/drivers/cpufreq/cpufreq.c b/drivers/cpufreq/cpufreq.c
>  > index 9e102af..5efd555 100644
>  > --- a/drivers/cpufreq/cpufreq.c
>  > +++ b/drivers/cpufreq/cpufreq.c
>  > @@ -1030,8 +1030,6 @@ static int __cpufreq_remove_dev (struct sys_device * sys_dev)
>  >
>  >         unlock_policy_rwsem_write(cpu);
>  >
>  > -       kobject_unregister(&data->kobj);
>  > -
>  >         kobject_put(&data->kobj);
>  >
>  >         /* we need to make sure that the underlying kobj is actually
>  >
>  >
>  > So, just on the off chance, I applied the patch below and bingo, the system
>  > powers off again. I doubt this will be the correct solution, but just in
>  > case it is, here's my signed off. A comment why the double put is needed
>  > would probably be good though.
>
>  There is a bug in the cpufreq kref logic that makes this "double put"
>  necessary.  A real fix has already been posted to solve this issue, and
>  I think it should be on it's way to Linus for -rc2 already.
>
>  Please let me know if -rc2 comes out without this needed fix.

after disable cpufreq, i got

ACPI: Preparing to enter system sleep state S5
Disabling non-boot CPUs ...
kvm: disabling virtualization on CPU1
CPU 1 is now offline
CPU1 is down
kvm: disabling virtualization on CPU2
CPU 2 is now offline
================> hang here.

but x86.git/mm could go through down all the cpus....

interesting...

YH
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/