# Buildkite: Major incident: macOS hosted agent jobs not starting

**Summary:** Buildkite reported a major outage preventing macOS hosted agent jobs from starting because of a misconfigured agent image update. Recorded start: 2026-09-30 06:30 UTC; recorded resolution: 2026-09-28 01:30 UTC; duration unknown. The vendor reported a fix and normal operation for new jobs; affected jobs still in Scheduled must be canceled and retried. _(machine-written, sol)_
- Kind: Major incident · Label: outage (model (Jev))
- Changed: 2026-09-30 06:30 UTC · Detected: 2026-10-17 18:22 UTC
- [Source: https://stspg.io/zvhyb8kcz74s](https://stspg.io/zvhyb8kcz74s)
- [Company: Buildkite](https://rewindex.com/company/buildkite.md)
- Versions: before (none: first archived) → after incident\_version:178/gk2h6y5plh6g@ad8c30d56d70
- Change 1 of 1 for this incident

## What changed

**1. Added: Title**

```diff
+ macOS hosted agent jobs not starting
```

**2. Added: Impact**

```diff
+ major
```

**3. Added: Status**

```diff
+ resolved
```

**4. Added: Start time**

```diff
+ 2026-09-30 06:30 UTC
```

**5. Added: Resolved time**

```diff
+ 2026-09-28 01:30 UTC
```

**6. Added: Update** (resolved) · 2026-09-28 01:30 UTC

```diff
+ Between 11:45 and 15:00 (GMT+10) on 28 September, macOS hosted agent jobs could not start because of a misconfigured agent image update. This has been fixed and new jobs are running normally. Jobs from that window still waiting in the Scheduled state won't start on their own. Please cancel and retry them.
```

## History of this incident

| When (UTC) | Change | Label |
| --- | --- | --- |
| 2026-09-30 06:30 UTC | Major incident: macOS hosted agent jobs not starting (this change) | outage |

All Buildkite changes: [timeline](https://rewindex.com/company/buildkite/changes.md)
_Diff excerpts are shown on normalized text: dates, counters and tokens appear as ‹date›, ‹count›, ‹tok›; noise-only edits are hidden. Rewindex shows the changed passages, not a copy of the page._


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Canonical: https://rewindex.com/change/i62cfc631939026 · Markdown: https://rewindex.com/change/i62cfc631939026.md · JSON: https://rewindex.com/api/v1/changes/i62cfc631939026 · Generated 2026-10-18T02:55:37.790Z