linux-kernel - Re: 2.6.24-rc1 and 2.6.24.rc2 hangs while running udev on my laptop

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Date:	Fri, 9 Nov 2007 13:10:52 +0100
From:	"Andreas Herrmann" <andreas.herrmann3@....com>
To:	"Andrew Morton" <akpm@...ux-foundation.org>
cc:	"SANGOI DINO LEONARDO" <dino.leonardo.sangoi@...ianz.it>,
	linux-kernel@...r.kernel.org, "Rafael J. Wysocki" <rjw@...k.pl>,
	"Len Brown" <len.brown@...el.com>,
	"Venki Pallipadi" <venkatesh.pallipadi@...el.com>,
	linux-acpi@...r.kernel.org
Subject: Re: 2.6.24-rc1 and 2.6.24.rc2 hangs while running udev on my
 laptop

> On Fri, 9 Nov 2007 09:47:02 +0100  SANGOI DINO LEONARDO <dino.leonardo.sangoi@...ianz.it> wrote:
> > Hi,
> >  
> > My laptop (an HP nx6125) doesn't boot with kernels 2.6.24-rc1 and
> > 2.6.24.rc2. 
> > It works fine with 2.6.23 and older.
> > 
> > I seen this bug first while running fedora rawhide, so you can find hardware
> > 
> > info and boot logs at https://bugzilla.redhat.com/show_bug.cgi?id=312201.
> > 
> > I did a git bisect, and got this:
> > 
> > $ git bisect bad
> > 4f86d3a8e297205780cca027e974fd5f81064780 is first bad commit
> > commit 4f86d3a8e297205780cca027e974fd5f81064780
> > Author: Len Brown <len.brown@...el.com>
> > Date:   Wed Oct 3 18:58:00 2007 -0400
> > 
> >     cpuidle: consolidate 2.6.22 cpuidle branch into one patch

    ... snip ...

> > Config is taken from Fedora kernel. CONFIG_CPU_IDLE is set to y (tell me if
> > full config is needed).
> > 
> > If I use 'nolapic' parameter, kernel 2.6.24-rc1 boots fine. 
> > Setting CONFIG_CPU_IDLE=n also gives me a working kernel.

I am just thinking aloud ...

Boot log in the bugzilla shows:

  CPU0: AMD Turion(tm) 64 Mobile ML-34 stepping 02

So it seems that the hardware just dislikes CONFIG_CPU_IDLE.

I haven't dealt with that cpuidle stuff in the past.
Now I am wondering with which platforms that code was verified.
And yes, I know the code was in -mm for a while.
But maybe the test coverage on AMD platforms was not that high?

What about making CONFIG_CPU_IDLE dependent on EXPERIMENTAL for
the time being and remove EXPERIMENTAL when some more testing has
been done?


Regards,

Andreas

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