Degraded Performance for GitHub Actions MacOS Runners
Incident
Report for GitHub
Resolved
On October 1, 2025 between 07:00 UTC and 17:20 UTC, Mac hosted runner capacity for Actions was degraded, leading to timed out jobs and long queue times. On average, the error rate was 46% and peaked at 96% of requests to the service. XL and Intel runners recovered by 10:10 UTC, with the other types taking longer to recover.
The degraded capacity was triggered by a scheduled event at 07:00 UTC that led to a permission failure on Mac runner hosts, blocking reimage operations. The permission issue was resolved by 9:41 UTC, but the recovery of available runners took longer than expected due to a combination of backoff logic slowing backend operations and some hosts needing state resets.
We deployed changes immediately following the incident to address the scheduled event and ensure that similar failures will not block critical operations in the future. We are also working to reduce the end-to-end time for self-healing of offline hosts for quicker full recovery of future capacity or host events.
The degraded capacity was triggered by a scheduled event at 07:00 UTC that led to a permission failure on Mac runner hosts, blocking reimage operations. The permission issue was resolved by 9:41 UTC, but the recovery of available runners took longer than expected due to a combination of backoff logic slowing backend operations and some hosts needing state resets.
We deployed changes immediately following the incident to address the scheduled event and ensure that similar failures will not block critical operations in the future. We are also working to reduce the end-to-end time for self-healing of offline hosts for quicker full recovery of future capacity or host events.
Update
We are seeing some recovery for image queueing and continuing to monitor.
Update
We are continuing work to restore capacity for our MacOS ARM runners.
Update
Our team continues to work hard on restoring capacity for the Mac runners.
Update
Work continues on restoring capacity on the Mac runners.
Update
MacOS ARM runners continue to be at reduced capacity, causing queuing of jobs. Investigation is ongoing.
Update
Work continues to bring the full runner capacity back online. Resources are focused on improving the recovery of certain runner types.
Update
We are continuing to see recovery of some runner capacity and investigating slow recovery of certain runner types.
Update
We are seeing recovery of some runner capacity, while also investigating slow recovery of certain runner types.
Update
MacOS runners are coming back online and starting to process queued work.
Update
We are continuing to deploy the necessary changes to restore MacOS runner capacity.
Update
We have identified the cause and are deploying a change to restore MacOS runner capacity.
Update
Customers using GitHub Actions Mac OS runners are experiencing job start delays and failures. We are aware of this issue and actively investigating.
Update
Actions is experiencing degraded performance. We are continuing to investigate.
Investigating
We are currently investigating this issue.
This incident affected: Actions.
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