linux-kernel - Re: 2.6.25-current-git hangs on boot unless CONFIG_CPU_IDLE=n

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Date:	Fri, 04 Apr 2008 14:10:56 +0200
From:	Soeren Sonnenburg <kernel@....de>
To:	"Carlos R\. Mafra" <crmafra2@...il.com>
Cc:	Ray Lee <ray-lk@...rabbit.org>,
	"Pallipadi\, Venkatesh" <venkatesh.pallipadi@...el.com>,
	"Rafael J\. Wysocki" <rjw@...k.pl>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Pallipadi@...e.sisk.pl
Subject: Re: 2.6.25-current-git hangs on boot unless CONFIG_CPU_IDLE=n -
	Apple

On Fri, 2008-04-04 at 08:47 -0300, Carlos R. Mafra wrote:
> On Thu  3.Apr'08 at 20:15:02 -0700, Ray Lee wrote:
> > On Thu, Apr 3, 2008 at 6:10 PM, Carlos R. Mafra <crmafra2@...il.com> wrote:
> > > On Thu  3.Apr'08 at 17:14:22 -0700, Pallipadi, Venkatesh wrote:
> > >  > >The following report is on the current list of known regressions
> > >  > >from 2.6.24.  Please verify if the issue is still present in the
> > >  > >mainline.
> > >  > >
> > >  > >
> > >  > >Bug-Entry    : http://bugzilla.kernel.org/show_bug.cgi?id=10093
> > >  > >Subject              : 2.6.25-current-git hangs on boot
> > >  > >unless CONFIG_CPU_IDLE=n - Apple
> > >  > >Submitter    : Soeren Sonnenburg <kernel@....de>
> > >  > >Date         : 2008-02-23 18:55 (41 days old)
> > >  > >References   : http://lkml.org/lkml/2008/2/23/263
> > >  > >
> > >  > >http://marc.info/?l=linux-acpi&m=120387537018467&w=4
> > >  > >Handled-By   : Pallipadi, Venkatesh <venkatesh.pallipadi@...el.com>
> > >  > >
> > >  >
> > >  > Last comment I saw from Soeren says it does not really hang. It waits
> > >  > for 5-10 seconds sometimes before continuing. We are still trying to
> > >  > narrow this down with max_cstate etc..
> > >
> > >  I should say that my laptop (Vaio) _hangs_ at boot (less than 10% of boots)
> > >  and this is the last message I see:
> > >
> > >  "ACPI: Processor [CPU1] (supports 8 throttling states)"
> > >
> > >  and it stays there "forever" (more than 1 or 2 minutes at least).
> > >
> > >  I am not using my laptop too much these days, and I thought this
> > >  bug had been solved because it didn't hang for the last week (but
> > >  I boot it once per day), however it hang last night (using some
> > >  post 2.6.25-rc7 kernel)
> > >
> > >  I have pictures of the screen while showing this last message at boot,
> > >  should I post it somewhere or that is not necessary?.
> > 
> > If the sysrq key still works when that happens, try to do a sysrq-t,
> > s, b to generate a trace, sync the filesystem, and reboot. If anything
> > made it to the logs, please post it.
> 
> Sysrq keys don't work when it hangs, I have to push the power button.
> 
> Another thing to notice is that when it happens, it usually happens
> more times in a row (like 3 times). And then it can take many boots to
> happen again.
> 
> 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

Actually this is 
http://bugzilla.kernel.org/show_bug.cgi?id=10117 ... and what you
describe is exactly what I was seeing. 

However I thought that we are talking about the hang with 
ladder governor as the last message on the screen. Anyway I am not sure
if both bugs are related or not but I couldn't reproduce the throttling
states bug with current mainstream...

Soeren
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