Re: git-bisect problem

[Andrew Morton <akpm@osdl.org>]

Junio C Hamano <junkio@cox.net> wrote:
>
> Andrew Morton <akpm@osdl.org> writes:
> 
> >> As humans, we can tell that it is not very plausible that the
> >>  EXTRAVERSION change caused whatever breakage you are chasing,
> >>  but sorry, from your log, I think bisect is doing the right
> >>  thing.
> >
> > I don't think humans are well-suited to using git.
> 
> I did not mean that ;-).  Git is not as smart as humans.
> 
> > My current theory is that I was bisecting Linus's tree all along.
> 
> Sorry, I did not realize that was _not_ what you were doing.
> Your log started by saying 2.6.16-rc1 is good but 2.6.16-rc2 was
> not, so I just assumed your bug was between those two.
> 
> If your suspect was merged between these two versions, then it
> does not matter which branch you were _on_ when you started to
> bisect.  
> 
> You mark points that are good and bad, and wander around in the
> commit DAG, trying to narrow down the distance between known
> good points and bad points while bisecting, and during that, you
> are not really on _any_ branch.

So how am I supposed to find this bug in Jeff's tree?

I do git-checkout -f git-netdev-all, then do the bisection and I come up
with junk.

<does it all again>

It points at this:

commit a03b1950521466e007288a25c9fc7ac7f05a97e5
Merge: 0b310f36d7d96e27f6941ec0f9b95e15142f1e78 c6f0d75a2defe8c7d8bf9f78de891cedc46b4b3e
Author: Jeff Garzik <jgarzik@pobox.com>
Date:   Tue Jan 31 11:52:21 2006 -0500

    Merge branch 'upstream-fixes'



git-bisect start
# good: [d834a41c966c6a20368fadb59248740935e6fbae] ipw2200: do not sleep in ipw_request_direct_scan
git-bisect good d834a41c966c6a20368fadb59248740935e6fbae
# bad: [b0afb58735e5dae05cb06ce6d0ca3073f390e9dc] Merge branch 'upstream'
git-bisect bad b0afb58735e5dae05cb06ce6d0ca3073f390e9dc
# good: [0c19585b0d2f6817dd9af607650d3f6cae2fd8bc] uml: typo fixup
git-bisect good 0c19585b0d2f6817dd9af607650d3f6cae2fd8bc
# good: [71baa1a599c04ab56ebf5fdb8d03abd0d601462f] [MIPS] Get rid of unnecessary prototypes. Fixes and optimizations for HZ > 100.
git-bisect good 71baa1a599c04ab56ebf5fdb8d03abd0d601462f
# good: [d04e4e115bd9df2b748cb30abd610f3c0eb1e303] eeh_driver NULL noise removal
git-bisect good d04e4e115bd9df2b748cb30abd610f3c0eb1e303
# good: [9908104935325bd6beba67d637b6f5396d47075c] [IPV6]: Address autoconfiguration does not work after device down/up cycle
git-bisect good 9908104935325bd6beba67d637b6f5396d47075c
# good: [0b310f36d7d96e27f6941ec0f9b95e15142f1e78] Merge branch 'upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wireless-2.6
git-bisect good 0b310f36d7d96e27f6941ec0f9b95e15142f1e78
# bad: [70c07e02625ec46d0ffbfce1acef42d660803528] Merge branch 'viro'
git-bisect bad 70c07e02625ec46d0ffbfce1acef42d660803528
# good: [2746b8623abce815aaae7afc946b1b39f8436f5a] Merge branch 'net.b0' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/bird
git-bisect good 2746b8623abce815aaae7afc946b1b39f8436f5a
# bad: [6bd0e10e53cc4824cd8cdaab8c370e53ab2e23c2] Merge branch 'sundance'
git-bisect bad 6bd0e10e53cc4824cd8cdaab8c370e53ab2e23c2
# bad: [3c9b3a8575b4f2551e3b5b74ffa1c3559c6338eb] Merge branch 'master'
git-bisect bad 3c9b3a8575b4f2551e3b5b74ffa1c3559c6338eb
# bad: [c0d3c0c0ce94d3db893577ae98e64414d92e49d8] [netdrvr] schedule eepro100 for removal
git-bisect bad c0d3c0c0ce94d3db893577ae98e64414d92e49d8
# bad: [a03b1950521466e007288a25c9fc7ac7f05a97e5] Merge branch 'upstream-fixes'
git-bisect bad a03b1950521466e007288a25c9fc7ac7f05a97e5