A hung test can block a hotfix when it occupies the only CI runner eligible to deploy. First establish whether the job is still running, queued, or failed; then use the platform’s supported cancellation and verify the runner is actually free. For the next run, bound job time and review runner capacity without weakening deployment access controls.
Why one hung test can block a hotfix
A CI job can start only when an eligible runner is available. Eligibility may depend on labels, tags, groups, or other authorization rules, while availability depends on whether a runner is online and able to accept work. If the only runner allowed to deploy is busy with a test, the hotfix may have no eligible execution slot.
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The title does not identify the CI platform or configuration, so it does not establish why the test hung or whether the deployment job is waiting. Treat this as a capacity and scheduling problem until job state and runner logs show more.
Check the job state before intervening
- Running: Inspect the current step and available job or runner logs. A job that appears idle may still be waiting on a subprocess or cleanup.
- Queued: Check which runner labels, tags, or groups the job requests, and whether any matching runner is online and available. A runner can exist but still be ineligible for this job.
- Failed or canceled: Confirm the terminal state in the CI platform and check whether the runner host has leftover processes or cleanup still in progress.
For GitHub Actions self-hosted runners, a matching runner must be online and idle and match the job’s runs-on labels and groups. If none is available, the job remains queued; GitHub documents that such a queued job fails after 24 hours. This is GitHub-specific queue behavior, not a universal CI limit. See GitHub’s self-hosted runner documentation.
Cancel a genuinely stuck job, then verify recovery
Use the cancellation control supported by your CI platform only after confirming the job is stuck and not performing a needed deployment or cleanup action. Cancellation status alone does not prove every process on the runner host has stopped.
GitLab’s job documentation says an unfinished job can be canceled and notes that a runner still executing it loses access to GitLab. After cancellation, confirm the job’s final state, inspect runner logs, and check the host for a lingering process before relying on that runner for the hotfix. The exact cancellation procedure depends on the platform; do not assume GitLab behavior or controls apply elsewhere. See GitLab CI/CD job documentation.
Set timeouts that limit damage without cutting off cleanup
A timeout puts a ceiling on how long a job can occupy a runner. Choose a limit based on the test’s normal runtime and release requirements; the incident details do not establish a safe duration.
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Review runner capacity and deployment eligibility
If tests and deployment jobs compete for one eligible runner, decide whether that shared capacity is intentional. Possible design changes include adding a redundant runner authorized to deploy, separating test execution from deployment work, or adjusting scheduling. These are options to assess, not guaranteed fixes for an unspecified setup.
For each option, check whether it creates an independently available runner for the hotfix, preserves the intended deployment authorization boundary, and avoids moving the bottleneck elsewhere. Adding capacity should not mean granting deployment access to runners or jobs that do not need it.
Runner count may not tell the whole story. GitLab’s advanced runner configuration guidance discusses worker, request, and build-limit bottlenecks, as well as tuning concurrency and limits when a bottleneck is identified. Those settings describe GitLab Runner; diagnose the actual platform before changing its concurrency model. See GitLab Runner advanced configuration.
Keep logs that can explain the next hang
Retain the job output and runner logs for the incident, including enough detail to distinguish a test process that stopped responding from one still running or waiting on cleanup. If using GitHub ephemeral runners—which can be configured to process one job and then deregister—GitHub recommends preserving their logs externally for troubleshooting. See GitHub’s self-hosted runner documentation.
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