Here you go, I used bisect and it showed me the wrong commit (2413) as the
troublemaker:

Administrator@Turing  ~/Dropbox/Desktop/foo (development)
$ git log --graph --full-history
* commit b7a8d7aa001d06eb7491ab5fb447a8dd3aa421a8
| Author: Ram Rachum <r...@rachum.com>
| Date:   Tue Apr 19 17:45:01 2016 +0300
|
|     adding more to some-file
|
*   commit 0aa833916e908ea93902a6c4c227f9a884a1bcef
|\  Merge: 2413945 3068c7d
| | Author: Ram Rachum <r...@rachum.com>
| | Date:   Tue Apr 19 17:44:31 2016 +0300
| |
| |     Merge branch 'master' into development
| |
| * commit 3068c7d2548f1798b6840f73b13a649937339f28
| | Author: Ram Rachum <r...@rachum.com>
| | Date:   Tue Apr 19 16:02:27 2016 +0300
| |
| |     Adding sugar to coffee
| |
* | commit 24139451ab954b1f0a9ef616775a3dba0ac81669
|/  Author: Ram Rachum <r...@rachum.com>
|   Date:   Tue Apr 19 16:01:28 2016 +0300
|
|       Creating some-file
|
* commit cf02fbbc40104cd02eea4c7c6f134ef1fd7b5661
  Author: Ram Rachum <r...@rachum.com>
  Date:   Tue Apr 19 16:00:47 2016 +0300

      Create coffee

Administrator@Turing  ~/Dropbox/Desktop/foo (development)
$ git bisect start

Administrator@Turing  ~/Dropbox/Desktop/foo (development|BISECTING)
$ git bisect good 3068

Administrator@Turing  ~/Dropbox/Desktop/foo (development|BISECTING)
$ git bisect bad b7a8
Bisecting: 0 revisions left to test after this (roughly 1 step)
[0aa833916e908ea93902a6c4c227f9a884a1bcef] Merge branch 'master' into
development

Administrator@Turing  ~/Dropbox/Desktop/foo ((0aa8339...)|BISECTING)
$ git bisect bad
Bisecting: 0 revisions left to test after this (roughly 0 steps)
[24139451ab954b1f0a9ef616775a3dba0ac81669] Creating some-file

Administrator@Turing  ~/Dropbox/Desktop/foo ((2413945...)|BISECTING)
$ git bisect bad
24139451ab954b1f0a9ef616775a3dba0ac81669 is the first bad commit
commit 24139451ab954b1f0a9ef616775a3dba0ac81669
Author: Ram Rachum <r...@rachum.com>
Date:   Tue Apr 19 16:01:28 2016 +0300

    Creating some-file

:000000 100644 0000000000000000000000000000000000000000
e69de29bb2d1d6434b8b29ae775ad8c2e48c5391 A  some-file

Administrator@Turing  ~/Dropbox/Desktop/foo ((2413945...)|BISECTING)
$


On Tue, Apr 26, 2016 at 6:46 PM, Dale R. Worley <wor...@alum.mit.edu> wrote:

> Ram Rachum <ram.rac...@gmail.com> writes:
> >     $ git log  --graph
> >     * commit b7a8d7aa001d06eb7491ab5fb447a8dd3aa421a8
> >     | Author: Ram Rachum <r...@rachum.com>
> >     | Date:   Tue Apr 19 17:45:01 2016 +0300
> >     |
> >     |     adding more to some-file
> >     |
> >     *   commit 0aa833916e908ea93902a6c4c227f9a884a1bcef
> >     |\  Merge: 2413945 3068c7d
> >     | | Author: Ram Rachum <r...@rachum.com>
> >     | | Date:   Tue Apr 19 17:44:31 2016 +0300
> >     | |
> >     | |     Merge branch 'master' into development
> >     | |
> >     | * commit 3068c7d2548f1798b6840f73b13a649937339f28
> >     | | Author: Ram Rachum <r...@rachum.com>
> >     | | Date:   Tue Apr 19 16:02:27 2016 +0300
> >     | |
> >     | |     Adding sugar to coffee
> >     | |
> >     * | commit 24139451ab954b1f0a9ef616775a3dba0ac81669
> >     |/  Author: Ram Rachum <r...@rachum.com>
> >     |   Date:   Tue Apr 19 16:01:28 2016 +0300
> >     |
> >     |       Creating some-file
> >     |
> >     * commit cf02fbbc40104cd02eea4c7c6f134ef1fd7b5661
> >       Author: Ram Rachum <r...@rachum.com>
> >       Date:   Tue Apr 19 16:00:47 2016 +0300
> >
> >           Create coffee
> >
> > In the very first commit, the file `coffee` was added. In the commit
> > `3068c7d`, I added a line "sugar" to the `coffee` file. But then I merged
> > this branch into the `development` branch, and in that merge, a mistake
> was
> > made and the "sugar" line was removed, leaving `coffee` empty. Then
> another
> > commit `b7a8d7a`, making an unrelated change, was added for good measure.
>
> > I also tried using `git bisect` to pin down the two commits, but it
> pointed
> > me to the wrong commit after I finished doing all the `git bisect bad`
> and
> > `git bisect good` actions.
>
> That seems really unlikely, since there is only one path between 3068
> and b7a8.  Can you reproduce the behavior and show us how it happened?
>
> Dale
>
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