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GitHub Copilot: Some macOS Actions jobs routing to Ubuntu instead

MinorStatus: resolvedStarted Resolved (1.3 h)1 updatewww.githubstatus.com (opens in new tab)

Timeline of updates

  1. resolved

    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 GitHub Copilot’s published incident history: for incidents before Rewindex began polling this status page, only the final update text is available.

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This incident predates live tracking (October 17, 2026). It came from the vendor’s own published history, which is not covered by checkpoints.

Impact, status and times are the vendor’s own, as last archived. View on www.githubstatus.com (opens in new tab).

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).

Title
Some macOS Actions jobs routing to Ubuntu instead
Vendor
GitHub Copilot
Date
URL
https://rewindex.com/company/github-copilot/incidents/17lxd87h22fj

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