On Mon, Jul 28, 2014 at 07:42:16PM +1000, Bryan Turner wrote:

> Running a git bisect between v2.0.1, which does not manifest this
> issue, and v2.0.2 fingers the following commit:
> bturner@ubuntu:~/Development/oss/git/git$ git bisect bad
> c1b3c71f4b4571abb2b2a457122fd100dc9f7eb0 is the first bad commit
> commit c1b3c71f4b4571abb2b2a457122fd100dc9f7eb0
> Author: Jeff King <p...@peff.net>
> Date:   Tue Jun 10 17:43:02 2014 -0400
> 
>     commit: convert commit->buffer to a slab

I haven't reproduced here yet, but this is almost certainly the bug
where lookup_unknown_object causes a bogus commit->index field (and
prior to the commit you found, diff-tree did not use commit->index).

The series that Junio has in jk/alloc-commit-id should fix the problem
(it's in master already, and slated for v2.1.0).

Junio, we should consider a v2.0.4 with that series, I think. This is a
pretty serious regression in diff-tree (I didn't even realize that the
buffer-slab work went into the maint series; that may have been a little
ambitious).

-Peff
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