Elijah Newren <new...@gmail.com> writes:

> In commit 743474cbfa8b ("merge-recursive: provide a better label for
> diff3 common ancestor", 2019-08-17), the label for the common ancestor
> was changed from always being
>
>          "merged common ancestors"
>
> to instead be based on the number of merge bases:
>
>     >=2: "merged common ancestors"
>       1: <abbreviated commit hash>
>       0: "<empty tree>"

I just saw, while running "git checkout next && git merge master",
this:

    diff --git a/packfile.c b/packfile.c
    index 3220761fb4..6413693a17 100644
    --- a/packfile.c
    +++ b/packfile.c
    @@ -16,7 +16,22 @@
     #include "object-store.h"
     #include "midx.h"
     #include "commit-graph.h"
    +<<<<<<< HEAD
     #include "promisor-remote.h"
    +||||||| merged common ancestors
    +<<<<<<<<< Temporary merge branch 1
    +||||||||| 瀉3.
    +=========
    +#include "promisor-remote.h"
    +>>>>>>>>> Temporary merge branch 2
    +||||||||| 瀉3.
    +>>>>>>>>>>> Temporary merge branch 2
    +=========
    +#include "promisor-remote.h"
    +>>>>>>>>> Temporary merge branch 2
    +=======
    +#include "promisor-remote.h"
    +>>>>>>> master

     char *odb_pack_name(struct strbuf *buf,
                        const unsigned char *hash,

where the common ancestor blocks are marked with random garbage.

I do not have time or patience to bisect and do not know if this is
a regression around this commit, but it smells suspiciously close.

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