CI fails fetching Eigen from GitLab under load
Assessment
- Difficulty
- 3/5
- Estimated time
- Half a day
- Newbie friendliness
- 30/100
- Issue type
- Bug
- Clarity
- Mostly clear
- Activity status
- Active
- Tech stack
- cmake, git, github-actions
- Domain
- build-system, ci-cd
Research direction
The failure comes from the CMake configure step (cmake -S . -B Release -DENABLE_DISTRIBUTION=ON) fetching Eigen 3.4.0 from gitlab.com, and the same fetch breaks the macOS uv sync path. Find where Eigen is fetched in the build configuration and the CI workflow that runs it, then decide between retrying, pinning a mirror, or vendoring the source; the issue does not pick one. Done when the Eigen fetch no longer depends on GitLab availability in CI, which the maintainers would need to confirm before work starts.
Written by the indexing model from the issue text.
Description
Description
On master (8969093263, October 16, 2026), Ubuntu and macOS fail to fetch Eigen 3.4.0 from https://gitlab.com/libeigen/eigen.git. All three clone attempts return:
fatal: remote error: GitLab is currently unable to handle this request due to load
Ubuntu fails during CMake configuration after 57 tests pass (2 expected failures). macOS fails during uv sync, before tests run. Windows passes.
Reproduction
In a fresh checkout of that commit, run:
cmake -S . -B Release -DCMAKE_BUILD_TYPE=Release -DENABLE_DISTRIBUTION=ON
Reproduction depends on GitLab availability.
Expected behavior
Eigen downloads successfully so builds and tests can complete.
Additional context
The Eigen fetch configuration is unchanged since the previous passing master run. The error points to GitLab overload; a fresh local clone of tag 3.4.0 now succeeds.
Code of Conduct
- I agree to follow this project's Code of Conduct and Contributing Guidelines
- Dominant language
- C++
- Stars
- 22
- Forks
- 45
- Avg merge
- 2d 16h
- Merged PRs (30d)
- 4
Getting set up
- No Dockerfile or Docker Compose file
- No pull request template
- Read the contributing guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
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