From: Karthik Nayak <karthik.188@gmail.com>
Date: Wed, 22 Jan 2025 17:28:40 GMT
Subject: Re: What's cooking in git.git (Jan 2025, #05; Fri, 17)
Message-ID: <CAOLa=ZT4nws0irdZKUuWc70Rv9RUNQuSXnGAt1SnE1O+umSReg@mail.gmail.com>
In-Reply-To: <CAOLa=ZSyEg8G9g1B78VRymgfk9eo=d3KkhD=+S14_BSqaAO2Mg@mail.gmail.com>

Karthik Nayak <karthik.188@gmail.com> writes:

> Junio C Hamano <gitster@pobox.com> writes:
>
>> * kn/reflog-migration-fix (2025-01-15) 1 commit
>>   (merged to 'next' on 2025-01-16 at ae8f9ce9a0)
>>  + reftable: write correct max_update_index to header
>>  (this branch is used by kn/reflog-migration-fix-followup.)
>>
>>  "git refs migrate" for migrating reflog data was broken.
>>
>>  Will merge to 'master'.
>>  cf. <Z4mUizLNUdq_1BgY@tapette.crustytoothpaste.net>
>>  source: <CAOLa=ZTL9n_DPhNr49XAd6bT838kc09oVx_AH7Pb4o8VK_xQ9w@mail.gmail.com>
>
> This seems to be breaking on 'next'. I tested it locally with
>
>   GIT_TEST_DEFAULT_REF_FORMAT=reftable meson test -v --test-args='-i' t1400-update-ref
>
> my local tests were made on files backend, and it didn't trigger on the
> CI either for some reason (I shall investigate that soon). But dscho
> (CC'd) reported that macos builds for reftable were failing [1] for his
> branch and I could bisect it to this.
>
> I'm yet to understand why this fails and also why the CI didn't notify
> of the issue. But that is something I shall do next. For now we need to
> remove it from next.
>
> [1]: https://github.com/dscho/git/actions/runs/12906424058/job/35987723223

This is reproducible when the leak sanitizier is enabled and tested
against reftable:

So setting up meson with:
  CC=clang meson setup --reconfigure -Db_sanitize=address,undefined build
and running the test in the build folder with:
  GIT_TEST_DEFAULT_REF_FORMAT=reftable meson test -v
--test-args='-ixd' t1400-update-ref

reproduces the issue. I haven't found the root cause yet, but will
mostly call it a day and get back to this tomorrow.

Karthik