linux-kernel - Re: 2.6.21-rc1: known regressions (part 2)

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Message-ID: <20070301104117.GA22788@elte.hu>
Date:	Thu, 1 Mar 2007 11:41:17 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Jens Axboe <jens.axboe@...cle.com>
Cc:	Pavel Machek <pavel@....cz>, Adrian Bunk <bunk@...sta.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"Michael S. Tsirkin" <mst@...lanox.co.il>,
	Thomas Gleixner <tglx@...utronix.de>, linux-pm@...ts.osdl.org,
	Michal Piotrowski <michal.k.k.piotrowski@...il.com>,
	Daniel Walker <dwalker@...sta.com>
Subject: Re: 2.6.21-rc1: known regressions (part 2)


* Ingo Molnar <mingo@...e.hu> wrote:

> update: f3ccb06f3b8e0cf42b579db21f3ca7f17fcc3f38 works for me too, and 
> 01363220f5d23ef68276db8974e46a502e43d01d is broken. I too will attempt 
> to bisect this.

hm. There's some weird bisection artifact here. Here are the commits i 
tested, in git-log order:

#1 commit 01363220f5d23ef68276db8974e46a502e43d01d bad
#2 commit ee404566f97f9254433399fbbcfa05390c7c55f7 bad
#3 commit f3ccb06f3b8e0cf42b579db21f3ca7f17fcc3f38 good
#4 commit c827ba4cb49a30ce581201fd0ba2be77cde412c7 bad

if i tell git-bisect that #1 is bad and #3 is good, then it offers me #2 
- that's OK. But when i tell it that #2 is bad, it offers #4 - which is 
out of order! The bisection goes off into la-la land after that and 
never gets back to a commit that is /after/ the good commit. How is this 
possible? (I upgraded from git-1.4.4 to 1.5.0 to make sure this isnt 
some git bug that's already fixed.)

i'll try to straighten this out manually, perhaps #3 is in some merge 
branch that confuses bisection. Or maybe i misunderstood how git-bisect 
works.

	Ingo
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