Date:	Mon, 7 Apr 2008 08:46:53 -0300
From:	"Carlos R. Mafra" <crmafra2@...il.com>
To:	"Pallipadi, Venkatesh" <venkatesh.pallipadi@...el.com>
Cc:	Ray Lee <ray-lk@...rabbit.org>, "Rafael J. Wysocki" <rjw@...k.pl>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Soeren Sonnenburg <kernel@....de>, rui.zhang@...el.com
Subject: Re: 2.6.25-current-git hangs on boot unless CONFIG_CPU_IDLE=n-Apple

On Sun  6.Apr'08 at 22:31:17 -0700, Pallipadi, Venkatesh wrote:
> >On Fri  4.Apr'08 at 13:41:45 -0700, Pallipadi, Venkatesh wrote:
> >> [...]
> >> >>> >I've uploaded the picture where it hangs, it is in the very 
> >> >>beginning
> >> >>> >of the boot process:
> >> >>> >
> >> >>> >http://www.ift.unesp.br/users/crmafra/dsc04673.jpg
> >> >>> 
> >> >>> 
> >> >>> Can you try the latest git and see whether this still is 
> >a problem?
> >> >>
> >> >>I've just updated to latest git, but it may take some time for it 
> >> >>to happen again (the first 3 boots were okay). Last time 
> >it happened
> >> >>with 2.6.25-rc7-00149-gaf8be4e (I checked now). 
> >> >>
> >> >>Do you have reasons to believe this issue was fixed since then?
> >> >
> >> >Yes. I think the patch here should have fixed the problem....
> >> >Patch : http://marc.info/?l=linux-kernel&m=120674502201007&w=4
> >> >
> >> 
> >> Hmmmm.... Looking at latest git,
> >> The above patch is not yet in git. Can you please apply the 
> >above patch
> >> and see whether do you still see the problem.....
> >
> >I applied Venkatesh's patch from the link above on top of 
> >v2.6.25-rc8-139-ge315c12, but my laptop hung at the 11th boot with the
> >same state show here:
> >http://www.ift.unesp.br/users/crmafra/dsc04673.jpg
> >
> >I waited 3'30" but the boot process never resumed, so I pressed
> >the power button.
> >
> >Any further patches I might try?
> 
> Carlos,
> 
> Hmm. So, we still have some bug hidden in there..
> As this is similar to 10117, we should probably track this there.
> 10093 is a different cpuidle specific bug looks like, as it happens at a
> different place while switching between governors.
> 
> Can you attach your kernel config, acpidump output and dmesg when kernel
> boots ok to that bugzilla.

I uploaded the kernel config and dmesg to the bugzilla a few minutes ago.
I don't have a copy of the acpidump with me right now (laptop is at home,
I am at the physics institute now), but if there is urgency you can look
at the acpidump I've sent here http://lkml.org/lkml/2008/2/11/364

> Also, if you can please try processor.max_cstate=2 boot option and see
> whether you still can reproduce the problem. If you can, then try
> processor.max_cstate=1. For this boot option to work, you have to have
> ACPI_PROCESSOR built into your kernel (and should not be a module).

Ok, I will try them.

> One more qn. Did you see this problem witj 2.6.24 as well or is this
> something that you started seeing only recently?

It started more or less at the same time as 2.6.25-rc1 was released.
It was not there at 2.6.24.

Well, at first I thought it was related to drivers/acpi/thermal.c, because
the next kernel message (in a successfull boot) after the point in which it 
fails is

ACPI: LNXTHERM:01 is registered as thermal_zone0

and there were some changes to that file a bit before -rc1 was out.
For example, commits 3f655ef8 and ce44e19701.

I don't know if this is recommended, but I added Zhang Rui to the Cc: list
to exclude or confirm this possibility.
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