# GitHub Copilot: Some macOS Actions jobs routing to Ubuntu instead

> GitHub Copilot status incident “Some macOS Actions jobs routing to Ubuntu instead” on 2025-12-10: impact minor (vendor’s label), 1.3 h, 1 update(s). Archived by Rewindex.

Canonical: https://rewindex.com/company/github-copilot/incidents/17lxd87h22fj
Last updated: 2025-12-10T14:52:00Z

- Impact (vendor’s label): minor
- Status: resolved
- Started: 2025-12-10 13:34 UTC · Resolved: 2025-12-10 14:52 UTC · Duration: 1.3 h
- Updates: 1
- [Vendor status page: https://www.githubstatus.com/incidents/17lxd87h22fj](https://www.githubstatus.com/incidents/17lxd87h22fj)
- [Company: GitHub Copilot](https://rewindex.com/company/github-copilot.md)

## Timeline of updates

- **resolved** 2025-12-10 14:52 UTC: Between December 9th, 2025 21:07 UTC and December 10th, 2025 14:52 UTC, 177 macos-14-large jobs were run on an Ubuntu larger runner VM instead of MacOS runner VMs. The impacted jobs were routed to a larger runner with incorrect metadata. We mitigated this by deleting the runner. The routing configuration is not something controlled externally. A manual override was done previously for internal testing, but left incorrect metadata for a large runner instance. An infrastructure migration caused this misconfigured runner to come online which started the incorrect assignments. We are removing the ability to manually override this configuration entirely, and are adding alerting to identify possible OS mismatches for hosted runner jobs. As a reminder, hosted runner VMs are secure and ephemeral, with every VM reimaged after every single job. All jobs impacted here were originally targeted at a GitHub-owned VM image and were run on a GitHub-owned VM image.

_From the vendor’s published history: only the final update text is available for incidents before Rewindex began polling this page._

## Cite this

Status incident (vendor impact label: minor) posted by GitHub Copilot, started 2025-12-10 13:34 UTC, resolved after 1.3 h, 1 update(s).

- Canonical URL: https://rewindex.com/company/github-copilot/incidents/17lxd87h22fj
- Citation: GitHub Copilot, “Some macOS Actions jobs routing to Ubuntu instead” (2025-12-10 13:34 UTC). Archived by Rewindex: https://rewindex.com/company/github-copilot/incidents/17lxd87h22fj (CC BY 4.0).
- Markdown link: `[GitHub Copilot: Some macOS Actions jobs routing to Ubuntu instead (2025-12-10)](https://rewindex.com/company/github-copilot/incidents/17lxd87h22fj)`


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Canonical: https://rewindex.com/company/github-copilot/incidents/17lxd87h22fj · Markdown: https://rewindex.com/company/github-copilot/incidents/17lxd87h22fj.md · JSON: https://rewindex.com/api/v1/companies/github-copilot/incidents/17lxd87h22fj · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-11-04T14:35:23.769Z