linux-kernel - Re: kexec boot regression

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Message-ID: <20091215121436.GB28252@kernel.dk>
Date:	Tue, 15 Dec 2009 13:14:37 +0100
From:	Jens Axboe <jens.axboe@...cle.com>
To:	Yinghai Lu <yinghai@...nel.org>
Cc:	Linux Kernel <linux-kernel@...r.kernel.org>, mingo@...e.hu,
	rdreier@...co.com
Subject: Re: kexec boot regression

On Tue, Dec 15 2009, Yinghai Lu wrote:
> Jens Axboe wrote:
> > Hi,
> > 
> > I have this big box that takes forever to boot, so I use kexec to boot
> > into new kernels. Works fine, but some time past 2.6.32 it stopped
> > working. Instead of wasting brain cycles on finding out why, I handed
> > the problem to my trusty regression friend - git bisect.
> > 
> > This is what it found (sorry Yinghai it's you again, you owe me a beer
> > for hours of 2.6.32-git bisecting ;-)
> 
> sure.
> 
> > 
> > 
> > 99935a7a59eaca0292c1a5880e10bae03f4a5e3d is the first bad commit
> > commit 99935a7a59eaca0292c1a5880e10bae03f4a5e3d
> > Author: Yinghai Lu <yinghai@...nel.org>
> > Date:   Sun Oct 4 21:54:24 2009 -0700
> > 
> >     x86/PCI: read root resources from IOH on Intel
> >     
> >     For intel systems with multi IOH, we should read peer root resources
> >     directly from PCI config space, and don't trust _CRS.
> > 
> > 
> > I could not revert this single commit, as a further commit made other
> > changes. So I reverted 67f241f4 first and then 99935a7a. I confirmed
> > that this kernel then works fine.
> >
> 
> let see how BIOS mess it up again!

Heh, I had a feeling this was coming :-)

> please.

Please find two logs attached - one from a boot with -git and the two
patches reverted, and one from a boot with -git.

-- 
Jens Axboe


Download attachment "good-boot.log.gz" of type "application/octet-stream" (15915 bytes)

Download attachment "bad-boot.log.gz" of type "application/octet-stream" (14734 bytes)