linux-kernel - Re: Linux 2.6.27-rc3: kernel BUG at mm/vmalloc.c

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Message-ID: <20080822171651.GP10544@machine.or.cz>
Date:	Fri, 22 Aug 2008 19:16:51 +0200
From:	Petr Baudis <pasky@...e.cz>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	"Alan D. Brunelle" <Alan.Brunelle@...com>,
	linux-kernel@...r.kernel.org, git@...r.kernel.org
Subject: Re: Linux 2.6.27-rc3: kernel BUG at mm/vmalloc.c - bisected

On Fri, Aug 22, 2008 at 09:25:49AM -0700, Andrew Morton wrote:
> On Fri, 22 Aug 2008 11:37:33 -0400 "Alan D. Brunelle" <Alan.Brunelle@...com> wrote:
> 
> > I /did/ bisect it down to the aforementioned merge, the question is: How
> > to crack open that merge into it's composite pieces? (Where do I go to
> > bisect within that?)
> 
> urgh, it's irritating when git-bisect directs you to a merge commit - it
> hasn't done it for me for ages.

Hmm, but doesn't that happen only when it's actually really the merge
commit that introduces the bug? Both parents of the merge commit were
marked as good by the user, so...

> One (probably wrong) approach is to run
> 
> 	gitk 1c89ac55017f982355c7761e1c912c88c941483d
> 
> then peer at the output, work out which real commits were in that
> merge.
> 
> It looks like the merge ended with
> b1b135c8d619cb2c7045d6ee4e48375882518bb5 and started with
> 40c42076ebd362dc69210cccea101ac80b6d4bd4, so perhaps you can do
> 
> 	git bisect bad b1b135c8d619cb2c7045d6ee4e48375882518bb5
> 	git bisect good 40c42076ebd362dc69210cccea101ac80b6d4bd4

...I don't quite get this - according to the bisection log,

	# good: [b1b135c8d619cb2c7045d6ee4e48375882518bb5] fix spinlock recursion in hvc_console

and now you want to mark it as bad?

You could try to revert some of the merged commits at the point of the
merge, though.

-- 
				Petr "Pasky" Baudis
The next generation of interesting software will be done
on the Macintosh, not the IBM PC.  -- Bill Gates
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