Junio C Hamano <gitster@xxxxxxxxx> writes:
> On Thu, Feb 19, 2015 at 7:03 AM, <ydirson@xxxxxxx> wrote:
>> I have a (fsck-clean) git tree in which for 2 commits A and B:
>>
>> * "git merge-base --is-ancestor A B" returns 0
>> * "git log B..A" returns a non-empty set of commits
>>
>> I get this behaviour with 2.3.0 as well as with 2.1.3 and 1.7.12.
>>
>> Is that a real bug or am I just misinterpreting something ?
>
> Sounds strange. Is it possible to share the repository (or an
> anonymised copy of it)?
Actually it does not sound all that strange.
I suspect that B is indeed a proper descendant of A, but you have
commits with screwed-up committer timestamps between these two
commits that break the cut-off heuristic used by log and reb-list.
Grab the output from "git rev-list B..A". These are supposed to be
ahead of B (i.e. should not be reachable from B). Then look at the
output from "git log B" (no lower bound) and see if these commits
appear there, perhaps like:
$ git rev-list B..A | sed -e 's/^/^/' >phantoms
$ git log --format='%H %ct' B | grep -C2 -f phantoms
Hits from the latter "grep" would indicate that what the traversal
B..A claimed that are not reachable from B contained some commits
that are indeed reachable from B.
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