Repository appears to advertise refs that reference missing objects (fetch/push failing: "not our ref" / "promisor remote" / index-pack failed)

[berkaykrc]

First Check

• I added a very descriptive title here.
• I used the GitHub search to find a similar question and didn't find it.
• I searched in the documentation/README.
• I already searched in Google "How to do X" and didn't find any information.
• I already read and followed all the tutorial in the docs/README and didn't find an answer.

Commit to Help

• I commit to help with one of those options 👆

Example Code

git remote add upstream git@github.com:fastapi/full-stack-fastapi-template.git
git fetch upstream --prune --verbose
git fetch --all --prune --verbose

Description

When fetching this repo as upstream I get errors showing refs that reference missing objects and server-side pack/index failures. I cannot fetch or push due to these missing objects. I have local corruption symptoms (some objects unreadable) and cannot recover them from the upstream clone.

fatal: remote error: upload-pack: not our ref 03e4ba1ef625116d28e3a920f6902977dca3631b
fatal: could not fetch 3c918968c2f249bd3bac0da1335672be1d566188 from promisor remote
fatal: fetch-pack: invalid index-pack output

# when pushing from a local repo (pack creation failed due to unreadable object)
fatal: unable to read d322e9d8a96cf1fcc767e15803ee28a598e0fe19
remote: fatal: early EOF
error: remote unpack failed: index-pack failed

Requested server-side checks / actions
Please run these checks and maintenance steps on the upstream repository (or provide guidance / a healthy bundle):

git fsck --full — identify broken/missing objects
git repack -a -d
git gc --prune=now
If the repo is a mirror or backed by replication, check replication/pack transfer logs for missing objects or interrupted repacks.
If you cannot repair the current pack files, please consider providing:
a server-generated bundle (git bundle create repo-recovery.bundle --all) or
a fresh pack (pack-*.pack/.idx) that contains the missing objects, or
a fresh clone/mirror that others can fetch from.
If you prefer, you can also point me to an alternate mirror or provide the bundle and I will fetch and repack locally.

Why this matters

The fetch/push failures prevent forks and downstream users from syncing and make it impossible to recover missing objects locally. A server-side repair or a provided bundle will let me (and others) restore history and continue work.
Logs / environment notes

I can provide full GIT_TRACE output and git fsck output on request. Local git version: git/2.51.0 (if you need specific details I can paste the trace).
Thanks — please advise what you can run on the server or provide (bundle / mirror / fix).

Operating System

Linux

Operating System Details

Operating System: Fedora Linux 42
KDE Plasma Version: 6.4.5
KDE Frameworks Version: 6.19.0
Qt Version: 6.9.2
Kernel Version: 6.17.4-200.fc42.x86_64 (64-bit)
Graphics Platform: Wayland
Processors: 16 × Intel® Core™ i5-14400F
Memory: 32 GiB of RAM (31,2 GiB usable)
Graphics Processor: NVIDIA GeForce RTX 4070 SUPER
Manufacturer: Micro-Star International Co., Ltd.
Product Name: MS-7E02
System Version: 2.0

Python Version

3.12.10

Additional Context

git push -u origin feature/cart-promo-order
Enumerating objects: 5523, done.
fatal: remote error: upload-pack: not our ref 002cc769c0c23753315cc5db755492008062ce04
fatal: could not fetch d322e9d8a96cf1fcc767e15803ee28a598e0fe19 from promisor remote
remote: fatal: early EOF
error: remote unpack failed: index-pack failed
To github.com:IchibaOrg/basuketto.git
 ! [remote rejected] feature/cart-promo-order -> feature/cart-promo-order (failed)