> This is a wild guess, but: are there any case collisions with that
> branch name (e.g., PTV-2164 or something) in the upstream repo?
Yes, actually! The only difference is in case (ptv-2164 vs PTV-2164).
> If that is the case, you can try using the reftables backend in v2.51.0.
> It doesn't use the filesystem for its ref storage or locking. Something
> like:
>
> git init --bare --ref-format=reftable
Reftable does, in fact, solve this!
>> This error _does not_ happen in the Apple-supplied version of git:
>> `git version 2.39.5 (Apple Git-154)`, but does in 2.51.0, which I
>> installed with homebrew. (If this is a packaging error, I'll happily
>> report to homebrew.)
>
> That is definitely weird, and not something I'd expect if it's just a
> case collision. Is it possible for you to build Git from source? If so,
> and the problem happens with your build of 2.51.0 but not v2.39.5, it
> would be very enlightening to see the results of "git bisect". We can
> provide more guidance if you need with that process.
I bisected (git 2.39.5 built from source _also_ doesn't have this issue), and found the first bad commit:
0e358de64a9e014575d11ef884bfc9beb931e37f is the first bad commit
commit 0e358de64a9e014575d11ef884bfc9beb931e37f
Author: Karthik Nayak <karthik.188@xxxxxxxxx>
Date: Mon May 19 11:58:07 2025 +0200
fetch: use batched reference updates
The reference updates performed as a part of 'git-fetch(1)', take place
one at a time. For each reference update, a new transaction is created
and committed. This is necessary to ensure we can allow individual
updates to fail without failing the entire command. The command also
supports an '--atomic' mode, which uses a single transaction to update
all of the references. But this mode has an all-or-nothing approach,
where if a single update fails, all updates would fail.
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