linux-kernel - Re: EDD problem -- regression -- crash on booting by probing EDD

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Message-ID: <20080426231704.GD22588@auslistsprd01.us.dell.com>
Date:	Sat, 26 Apr 2008 18:17:04 -0500
From:	Matt Domsch <Matt_Domsch@...l.com>
To:	Randy Dunlap <randy.dunlap@...cle.com>
Cc:	werner <werner@...aya.yi.org>, linux-kernel@...r.kernel.org
Subject: Re: EDD problem -- regression -- crash on booting by probing EDD

On Wed, Apr 23, 2008 at 08:35:47AM -0700, Randy Dunlap wrote:
> On Tue, 22 Apr 2008 21:20:44 -0300 (GFT) werner wrote:
> 
> > As I tested yesterday extensively, the problem wasn't present at 2.6.24-rc5-git6 (SYS Linux 0.17 install DVD) nor at 2.6.24-rc6-git2 (SYS 0.19) ,  but at 2.6.24-rc6-git8 (SYS 0.20-rc1 and 0.20-rc2) and 2.6.25 (0.21-r3).
> > 
> > The whole compiled packages of these kernels still are at copaya.yi.org/tgz , but I extracted  the important parts, see enclosed here.    The .tar.bz2 file contains  the config  and the protocoll of the compilation (inclusive warning / error messages). 
> > 
> > As you can see, the diff between the config of 2.6.24-rc6-git2 and -git8 is nothing.  That means: THE ERROR ENTERED INTO THE KERNEL BETWEEN THESE TWO GITs !!      
> 
> Hi,
> I'm a little confused.
> 
> Is this supposed to be "between 2.6.25-rc6-git2 and 2.6.25-rc6-git8"?
> You say 2.6.24-rc6-git*.  I just want to make sure of which patch
> interval we are looking at.

It's definitely .24 given the dates for the SYS releases he notes. The
diffstat between the two is relatively short [1], but I can't see
anything that can be related.  This code runs so early, during real
mode startup, that my only suspects are:

 arch/x86/kernel/head_32.S                      |    2 +-
 arch/x86/kernel/smpboot_64.c                   |    2 +-
 include/asm-generic/tlb.h                      |    3 -
 include/asm-x86/byteorder.h                    |    4 +-
 include/asm-x86/msr.h                          |   74 +++++++++--------



[1] http://domsch.com/linux/edd-bug-2008-04-26.patch

but none of those are obviously the culprit to me...

Werner, the initcall_debug trace would be most helpful; without that
I'm not sure how much progress we can make on this.

Thanks,
Matt

-- 
Matt Domsch
Linux Technology Strategist, Dell Office of the CTO
linux.dell.com & www.dell.com/linux
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