linux-kernel - Re: kexec boot regression

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Date:	Tue, 15 Dec 2009 15:11:06 +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:
> > On Tue, Dec 15 2009, Yinghai Lu wrote:
> >> Jens Axboe wrote:
> >>> 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.
> >> please enabled CONFIG_PCI_DEBUG and boot with debug in boot command line.
> > 
> > On the good or bad kernel?
> 
> both please.

Attached.

-- 
Jens Axboe


Download attachment "good-log-debug.txt.gz" of type "application/octet-stream" (41724 bytes)

Download attachment "bad-log-debug.txt.gz" of type "application/octet-stream" (38731 bytes)