linux-kernel - Re: Kernel panic at boot with ondemand governor as default (2.6.24-rc2)

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Date:	Mon, 12 Nov 2007 16:23:09 +0100
From:	Thomas Renninger <trenn@...e.de>
To:	Eric Piel <Eric.Piel@...l.fr>
Cc:	linux-kernel@...r.kernel.org,
	Venkatesh Pallipadi <venkatesh.pallipadi@...el.com>,
	Dave Jones <davej@...hat.com>,
	cpufreq <cpufreq@...ts.linux.org.uk>
Subject: Re: Kernel panic at boot with ondemand governor as
	default	(2.6.24-rc2)

On Mon, 2007-11-12 at 15:02 +0100, Eric Piel wrote:
> 11/12/2007 10:16 AM, Thomas Renninger wrote/a écrit:
> > On Sun, 2007-11-11 at 20:10 +0100, Eric Piel wrote:
> >> Hello,
> >>
> >> I've tried kernel 2.6.24-rc2 and I have a problem with the new option 
> >> for setting up the cpufreq ondemand governor as default: a kernel panic 
> >> happens early at boot time. If I boot first with performance governor 
> >> and later change to ondemand, everything is fine (as usual).
> >>
> >> This seems related to the delayed_workqueue. The kernel panic message 
> >> finishes by:
> >> EIP: [<c012aa60>] wq_per_cpu+0x0/0x10 SS:ESP 0068:c191be58
> >> Kernel panic - not syncing: Attempted to kill init!
> >>
> >> A picture of the whole message is available here:
> >> http://pieleric.free.fr/unorder/1162-ondemand-panic.jpg
> >>
> >> My computer is a x86 using speedstep-ich, and you can find the full 
> >> .config leading to the panic attached.
> >>
> >> Does anyone has any idea was it going wrong?
> > 
> > Does it work if you compile speedstep-ich as a module?
> > If you load it, ondemand governor should still be set up automatically.
> > If this works, could it be that the kernel does not like that
> > queue_delayed_work_on is called that early?
> 
> Yes, it works if I compile speedstep-ich as module. I've put the module 
> in initramfs and as soon it is loaded, the ondemand governor is selected 
> and works.
> 
> However, do you think it's ok to prevent cpufreq drivers to be built-in 
> if ondemand governor is selected as default?
> Another way would be to 
> reorganise the initialisation code so that workqueue is initialised 
> before the cpufreq framework is started, do you think it's possible?
Making all this work with low-level drivers built in would be perfect of
course...
If nobody answers the next days, could you open a bug at
bugzilla.kernel.org, so that this does not get lost, pls.
Add myself and Venkatesh to CC...
I try to have a look at it ASAP.
If someone already finds out more, this would be great.

Thanks,

   Thomas

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