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From:   Eric Sunshine <sunshine@sunshineco.com>
Date:   Sat, 9 Jan 2021 04:11:09 -0500
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Subject: Re: Is t5516 somehow flakey only on macOS?
To:     Junio C Hamano <gitster@pobox.com>
Cc:     Git List <git@vger.kernel.org>
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On Fri, Jan 8, 2021 at 7:39 PM Junio C Hamano <gitster@pobox.com> wrote:
> I've seen this breakage only on "regular (osx-clang, clang,
> macos-latest)" so far, but that does not necessarily mean clang on
> macOS is miscompiling or anything like that.
>
>  https://github.com/git/git/runs/1671504998?check_suite_focus=true
>
> Any interest in helping to find out what's going on from folks in
> the macOS land?

Something seems to be dying prematurely. The code in question from
test #86 "deny fetch unreachable SHA1, allowtipsha1inwant=false" is:

    test_must_fail env GIT_TEST_PROTOCOL_VERSION=0 \
        git fetch ../testrepo/.git $SHA1_3 2>err &&
    test_i18ngrep "remote error:.*not our ref.*$SHA1_3\$" err

In a successful run, the content of `err` is:

    fatal: git upload-pack: not our ref 64ea4c133d59fa98e86a771eda009872d6ab2886
    fatal: remote error: upload-pack: not our ref
64ea4c133d59fa98e86a771eda009872d6ab2886

However, in the unsuccessful run from CI, it is:

    fatal: git upload-pack: not our ref 64ea4c133d59fa98e86a771eda009872d6ab2886
    fatal: unable to write to remote: Broken pipe

Perhaps this means something to someone familiar with this area of the code.