[teamleaderleo]

What

The owned-pool rescue no longer cancels a started nightly (main nightly or nightly-next) because one runner is slow.

assess() counted only owned in_progress jobs as blockers (on_mini). So when build-nightly-app waited on the trusted pool, the rescue cancelled the whole run while a Blacksmith or Linux sibling was mid-job, such as the Ghostty CLI helper build. For a nightly (reserved=True), the rescue now never cancels the run while a sibling is still running:

• Queued job: every running job, on any pool, blocks the cancel. A stuck owned job waits until nothing else runs.
• Job held in setup: running siblings are not cancelled, not even as the watch ends.
• Refusal at the watch limit: if the nightly is still running other jobs, it is left alone with a warning instead of being cancelled.
• Right before any cancel in rescue(), both the superseded-head cancel and the stuck-job cancel: the run's jobs are read again (started_nightly_work()). A nightly with any job running is not cancelled, because a sibling can start between the look and the cancel. The nightly-next tick re-runs a failed tip, and the next nightly builds main.

Nothing changes for other workflows.

Why

The rule is that a started nightly is never cancelled for a slow runner. The existing test Nightly.test_a_stuck_build_moves_to_blacksmith_keeping_what_passed encoded the bug: it cancelled a running Blacksmith helper.

Tests

tests/test_ci_owned_pool_rescue.py:

• The old test is flipped so a stuck build never cancels a started sibling.

• New tests: a stuck build moves once nothing else runs, a held build at the watch end, and a refusal at the watch end.

• The refusal tests whose run finishes now let their helper finish too. Before, the helper never finished, and those tests only passed through the deadline cancel.

• New tests for a Linux sibling that starts after the look (including a superseded run) and for a Linux sibling at the look.

The full file passes (257 tests).

Risk

Low. Only nightly runs change, and in the direction of cancelling less. A nightly whose owned job stays stuck while siblings run now waits instead of moving to Blacksmith mid-run.

Agent session: agent session

🤖 Generated with Claude Code

Summary by CodeRabbit

• Bug Fixes
  • Nightly runs are no longer cancelled while jobs are in progress, including during runner setup or on other execution environments.
  • If a refusal remains at the watch deadline while jobs are running, the nightly run is left untouched.
  • Before cancelling a nightly run, the system checks for newly started jobs. If work is active, it resumes watching unless the deadline has passed. The check also applies when retrying a rate-limited cancellation, and cancellation stops if the run has finished or its attempt has changed.

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Walkthrough

Nightly rescue now treats in-progress jobs across pools and runner setup as active work. It checks job status before cancellation and retries. If work starts, the watcher resumes unless the deadline has passed.

Changes: Nightly rescue behavior

Layer / File(s)	Summary
Assess blocking nightly jobs scripts/ci/owned_pool_rescue.py, tests/test_ci_owned_pool_rescue.py	Nightly assessment counts in-progress jobs across runner pools, including jobs in setup. Tests model helper completion and cover active and completed job states.
Handle refusals at the watch deadline scripts/ci/owned_pool_rescue.py, tests/test_ci_owned_pool_rescue.py	When a nightly refusal remains while a job is in progress at the watch limit, the watcher logs a warning and stops without cancelling the run.
Guard cancellation and resume watching scripts/ci/owned_pool_rescue.py, tests/test_ci_owned_pool_rescue.py	Rescue checks for in-progress nightly jobs before cancellation and before a retry. If work starts, the watcher resumes unless the deadline has passed. Tests cover late-starting siblings, retry checks, and resumed watching.

Priority: Normal

Estimated code review effort: 3 (Moderate) | ~25 minutes

Change: Bug fix

Sequence Diagram(s)

sequenceDiagram
  participant follow
  participant rescue
  participant nightly_cancel
  participant GitHub
  follow->>rescue: assess nightly run
  rescue->>nightly_cancel: request guarded cancellation
  nightly_cancel->>GitHub: check attempt, completion, and running jobs
  GitHub-->>nightly_cancel: run and job status
  nightly_cancel->>GitHub: cancel if no nightly work is active
  nightly_cancel-->>follow: report active work
  follow->>rescue: resume watching

Loading

Possibly related issues

• nightly-next feed: feat-cmux-next pushes waiting more than 0.5h #25708: The issue reports nightly-next runs waiting for a slow runner. This change keeps the nightly run on the watch path while work remains active.
• cmux NEXT build is failing on nightly-next #25565: The issue reports a nightly-next run with jobs cancelled together. This change rechecks for running jobs before cancellation.
• cmux NEXT build is failing on nightly-next #25073: The issue reports a nightly-next run with jobs cancelled together. This change rechecks for running jobs before cancellation.
• cmux NEXT build is failing on nightly-next #25145: The issue reports a nightly-next run with all jobs cancelled. This change blocks cancellation while nightly work is active.
• cmux NEXT build is failing on nightly-next #25010: The issue reports build, signing, and publish jobs cancelled. This change blocks cancellation while nightly work is active.
• Runner label starved: glaeda-runner-cmux15-glaeda+glaeda-trusted-std-xcode-26.6 #26038: The issue reports a queued nightly build on a starved runner label. This change updates rescue decisions for nightly jobs delayed by slow or unavailable runners.
• Runner label starved: glaeda-runner-cmux15-glaeda+glaeda-trusted-std-xcode-26.6 #26172: The issue reports queued nightly builds on a starved runner label. This change updates nightly rescue decisions for this state.
• Runner label starved: glaeda-runner-cmux15-glaeda+glaeda-trusted-std-xcode-26.6 #26190: The issue reports a queued nightly build on a starved runner label. This change updates cancellation and watch decisions for this state.

Possibly related PRs

• manaflow-ai/cmux#25008: Both changes affect nightly watch behavior at the watch limit.
• manaflow-ai/cmux#25430: Both changes affect cancellation decisions for superseded nightly runs.
• manaflow-ai/cmux#25510: This change uses pre-cancel checks before the initial cancellation and each retry.

Suggested reviewers: austinywang

Merge Risk: Low · previous review 258b3

A job starting during stalled-signing rescue can end the nightly’s active watch and delay later refusal handling. Fix that watch transition before merging if continuous rescue coverage is required.

Pre-merge checks: 24 · 1

Failed checks: 1 warning

Check name	Status	Explanation	Resolution
Docstring Coverage		Docstring coverage is 21.05% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Documentation-only edits and deletions within surv…	Write docstrings for the functions missing them to satisfy the coverage threshold.

Passed checks: 24 passed

Check name	Status	Explanation
Title check		The title clearly and concisely describes the main change: nightly rescue no longer cancels started work because of a slow runner.
Description check		The description explains the problem, resulting behavior, implementation scope, tests, and risk. It does not use the template headings for Changelog, Proof, or Checklist, and it does not state that th…
Linked Issues check		Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check		Check skipped because no linked issues were found for this pull request.
Cmux Cloud Persistent Session And Early Input		PASS. The pull request changes only scripts/ci/owned_pool_rescue.py and its tests. It updates nightly CI run cancellation and retry checks. It does not change Cloud terminal creation, cmux-tui trans…
Cmux Swift Actor Isolation		PASS. The pull request changes only Python and test files: scripts/ci/owned_pool_rescue.py and tests/test_ci_owned_pool_rescue.py. The reviewed diff contains no Swift production changes, so the Sw…
Cmux Swift Blocking Runtime		PASS: The pull request changes only scripts/ci/owned_pool_rescue.py and tests/test_ci_owned_pool_rescue.py. The reviewed diff contains no Swift production changes, so this Swift blocking-runtime c…
Cmux Browser Automation Off-Main		PASS: The pull request changes only scripts/ci/owned_pool_rescue.py and tests/test_ci_owned_pool_rescue.py. The diff contains Python nightly-rescue logic and tests, not browser socket automation c…
Cmux Expensive Synchronous Load		The reviewed diff changes only scripts/ci/owned_pool_rescue.py and tests/test_ci_owned_pool_rescue.py. It adds no production Swift changes and cannot introduce the specified expensive synchronous …
Cmux Cache Substitution Correctness		PASS: The pull request changes only Python files: scripts/ci/owned_pool_rescue.py and tests/test_ci_owned_pool_rescue.py. The cache-substitution check applies only to production Swift, TypeScript,…
Cmux No Hacky Sleeps		PASS. The production diff adds no fixed sleep, timer, delayed dispatch, or wall-clock wait. The new cancellation guard reads the actual GitHub run and job state immediately before cancellation and bef…
Cmux Algorithmic Complexity		PASS. The production changes scan the bounded GitHub job list linearly in assess() and started_nightly_work(); the only new sort is over currently running jobs. GitHub.jobs() limits retrieval to…
Cmux Swift Concurrency		PASS: The pull request changes only scripts/ci/owned_pool_rescue.py and tests/test_ci_owned_pool_rescue.py. Both files are Python, and the diff contains no Swift code or Swift concurrency patterns…
Cmux Swift @Concurrent		The pull request changes only Python files: scripts/ci/owned_pool_rescue.py and tests/test_ci_owned_pool_rescue.py. It introduces no Swift code, Swift async functions, or Swift call sites covered …
Cmux Swift Package Boundaries		The reviewed diff changes only scripts/ci/owned_pool_rescue.py and tests/test_ci_owned_pool_rescue.py. It introduces no Swift production code and cannot violate the Swift package boundary rules.
Cmux Swiftpm Lockfiles		The pull request changes only scripts/ci/owned_pool_rescue.py and tests/test_ci_owned_pool_rescue.py. It does not change a SwiftPM package, Xcode project, .gitignore, workflow, dependency declar…
Cmux Swift Logging		The pull request changes only scripts/ci/owned_pool_rescue.py and tests/test_ci_owned_pool_rescue.py. It adds no Swift code or logging statements, so the Swift logging rule does not apply.
Cmux User-Facing Error Privacy		PASS. The production diff changes scripts/ci/owned_pool_rescue.py, which .github/workflows/ci-owned-pool-rescue.yml runs as an internal GitHub Actions rescue job. The new messages are CI log and o…
Cmux Full Internationalization		The PR changes only scripts/ci/owned_pool_rescue.py and its tests. The added or changed English strings are CI rescue outcomes, warnings, and diagnostics in an operational script, not product UI, we…
Cmux Swiftui State Layout		The pull request changes only scripts/ci/owned_pool_rescue.py and tests/test_ci_owned_pool_rescue.py. It contains no SwiftUI or Swift changes, so the SwiftUI state-layout rules do not apply.
Cmux Architecture Rethink		PASS: The pull request changes only Python CI logic in scripts/ci/owned_pool_rescue.py and its Python tests. It introduces no Swift architecture changes, so the Swift-specific failure conditions do …
Cmux Swift Auxiliary Window Close Shortcuts		PASS: The reviewed diff changes only scripts/ci/owned_pool_rescue.py and tests/test_ci_owned_pool_rescue.py. It contains no Swift, NSWindow, NSPanel, SwiftUI Window, or WindowGroup changes, so the…
Cmux Source Artifacts		The diff changes only scripts/ci/owned_pool_rescue.py and tests/test_ci_owned_pool_rescue.py. These are hand-written source and test files. The changes add rescue logic and focused test coverage. …
Cmux No Test Or Debug Seam In Production Source		PASS: The pull request changes only scripts/ci/owned_pool_rescue.py and tests/test_ci_owned_pool_rescue.py. It adds no Swift file under a production Sources/ path, so this check does not apply.

Full details: Description check

Explanation

The description explains the problem, resulting behavior, implementation scope, tests, and risk. It does not use the template headings for Changelog, Proof, or Checklist, and it does not state that this CI-only change has no release-note entry or visual proof, but the core review information is complete.

Full details: Cmux Cloud Persistent Session And Early Input

Explanation

PASS. The pull request changes only scripts/ci/owned_pool_rescue.py and its tests. It updates nightly CI run cancellation and retry checks. It does not change Cloud terminal creation, cmux-tui transport, manual panes, PTY or shell readiness, input routing, snapshots, or auth/lease/revision handling. The stated rule therefore does not apply.

Full details: Cmux Swift Actor Isolation

Explanation

PASS. The pull request changes only Python and test files: scripts/ci/owned_pool_rescue.py and tests/test_ci_owned_pool_rescue.py. The reviewed diff contains no Swift production changes, so the Swift actor-isolation check is not applicable.

Full details: Cmux Swift Blocking Runtime

Explanation

PASS: The pull request changes only scripts/ci/owned_pool_rescue.py and tests/test_ci_owned_pool_rescue.py. The reviewed diff contains no Swift production changes, so this Swift blocking-runtime check does not apply.

Full details: Cmux Browser Automation Off-Main

Explanation

PASS: The pull request changes only scripts/ci/owned_pool_rescue.py and tests/test_ci_owned_pool_rescue.py. The diff contains Python nightly-rescue logic and tests, not browser socket automation commands. It does not touch Sources/TerminalController.swift, ControlCommandExecutionPolicy.swift, socketWorkerMethods, WebKit waits, or worker-router policy tests. Therefore it does not introduce or worsen the checked condition.

Full details: Cmux Expensive Synchronous Load

Explanation

The reviewed diff changes only scripts/ci/owned_pool_rescue.py and tests/test_ci_owned_pool_rescue.py. It adds no production Swift changes and cannot introduce the specified expensive synchronous Swift load.

Full details: Cmux Cache Substitution Correctness

Explanation

PASS: The pull request changes only Python files: scripts/ci/owned_pool_rescue.py and tests/test_ci_owned_pool_rescue.py. The cache-substitution check applies only to production Swift, TypeScript, and JavaScript changes, so it is not applicable.

Full details: Cmux No Hacky Sleeps

Explanation

PASS. The production diff adds no fixed sleep, timer, delayed dispatch, or wall-clock wait. The new cancellation guard reads the actual GitHub run and job state immediately before cancellation and before retries. The resumed watch reuses the existing deadline and polling mechanism. The added timing tests use deterministic clocks and injected sleep callbacks, which the rule allows.

Full details: Cmux Algorithmic Complexity

Explanation

PASS. The production changes scan the bounded GitHub job list linearly in assess() and started_nightly_work(); the only new sort is over currently running jobs. GitHub.jobs() limits retrieval to three pages of 100 jobs, and this CI rescue path is not a listed hot UI, socket, search, or process-sampling path. The diff adds no nested full-collection scan, batch per-target rescan, in-memory join, or unbenchmarked algorithm for ~1000 user-owned records.

Full details: Cmux Swift Concurrency

Explanation

PASS: The pull request changes only scripts/ci/owned_pool_rescue.py and tests/test_ci_owned_pool_rescue.py. Both files are Python, and the diff contains no Swift code or Swift concurrency patterns. The cmux-owned Swift concurrency check is not applicable.

Full details: Cmux Swift `@Concurrent`

Explanation

The pull request changes only Python files: scripts/ci/owned_pool_rescue.py and tests/test_ci_owned_pool_rescue.py. It introduces no Swift code, Swift async functions, or Swift call sites covered by the rule.

Full details: Cmux Swiftpm Lockfiles

Explanation

The pull request changes only scripts/ci/owned_pool_rescue.py and tests/test_ci_owned_pool_rescue.py. It does not change a SwiftPM package, Xcode project, .gitignore, workflow, dependency declaration, or Package.resolved file. The SwiftPM lockfile policy is therefore not triggered.

Full details: Cmux User-Facing Error Privacy

Explanation

PASS. The production diff changes scripts/ci/owned_pool_rescue.py, which .github/workflows/ci-owned-pool-rescue.yml runs as an internal GitHub Actions rescue job. The new messages are CI log and operator diagnostic text. Provider names, runner names, and job names are allowed on this internal CI surface. The diff does not create a cmux app UI, product CLI, or product API path to an end user, and it does not expose secrets, credentials, tokens, or payload dumps.

Full details: Cmux Full Internationalization

Explanation

The PR changes only scripts/ci/owned_pool_rescue.py and its tests. The added or changed English strings are CI rescue outcomes, warnings, and diagnostics in an operational script, not product UI, web messages, API responses, metadata, or rendered content. The tests do not add user-facing text. The internationalization rule explicitly allows operational docs and debug-only logs, and no Swift or locale/catalog files changed.

Full details: Cmux Architecture Rethink

Explanation

PASS: The pull request changes only Python CI logic in scripts/ci/owned_pool_rescue.py and its Python tests. It introduces no Swift architecture changes, so the Swift-specific failure conditions do not apply.

Full details: Cmux Swift Auxiliary Window Close Shortcuts

Explanation

PASS: The reviewed diff changes only scripts/ci/owned_pool_rescue.py and tests/test_ci_owned_pool_rescue.py. It contains no Swift, NSWindow, NSPanel, SwiftUI Window, or WindowGroup changes, so the auxiliary-window close-shortcut rule is not applicable.

Full details: Cmux Source Artifacts

Explanation

The diff changes only scripts/ci/owned_pool_rescue.py and tests/test_ci_owned_pool_rescue.py. These are hand-written source and test files. The changes add rescue logic and focused test coverage. No local output, generated logs, screenshots, recordings, temporary folders, dependency checkouts, caches, build output, package-manager downloads, or broad artifact directories appear in the changed paths.

Full details: Docstring Coverage

Explanation

Docstring coverage is 21.05% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Documentation-only edits and deletions within surviving functions are included; unchanged diff context and fully deleted functions are excluded. Analyzed 38 functions across 2 files.

Resolution

Write docstrings for the functions missing them to satisfy the coverage threshold.

Finishing Touches: 💡 1

📝 Generate docstrings: 💡

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Inline comments:
Review comments at @scripts/ci/owned_pool_rescue.py:
- Line 1005: Update rescue() to recheck the nightly run’s attempt jobs
immediately before api.cancel(), rather than relying on the earlier jobs
snapshot filtered with in_setup; if any job has started, leave the nightly run
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Review comments at @tests/test_ci_owned_pool_rescue.py:
- Around line 2592-2593: Update the stalled-sibling fixture’s state and
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- Line 2235: In check(), wrap the api.run(target.run_id) read with the existing
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Supported by static analysis

Script executed:

sed -n '1520,1610p' scripts/ci/owned_pool_rescue.py
sed -n '2200,2365p' scripts/ci/owned_pool_rescue.py
sed -n '2560,2630p' scripts/ci/owned_pool_rescue.py
rg -n 'def read\(|def request\(|def cancel\(|READ_ATTEMPTS|before_retry|except .*Aborted' scripts/ci/owned_pool_rescue.py

Repository: manaflow-ai/cmux

Length of output: 22335

---

Script executed:

sed -n '470,505p' scripts/ci/owned_pool_rescue.py
sed -n '1335,1420p' scripts/ci/owned_pool_rescue.py
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Repository: manaflow-ai/cmux

Length of output: 14260

---

Retry the run read before retrying a nightly cancel.

check() calls api.run(target.run_id) directly. A transient read error can escape GitHub.request(), abort nightly_cancel(), and make follow() give up without cancelling the run. Wrap the read with the existing retry helper.

♻️ Suggested fix

-        run = api.run(target.run_id) or {}
+        run = read(lambda: api.run(target.run_id), sleep, log) or {}

Committable suggestion

IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.

Suggested change

	run = api.run(target.run_id) or {}
	run = read(lambda: api.run(target.run_id), sleep, log) or {}

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Review comment at @scripts/ci/owned_pool_rescue.py at line 2235:
In check(), wrap the api.run(target.run_id) read with the existing read retry
helper, passing the established sleep and log dependencies, so transient read
errors are retried before nightly cancellation proceeds.

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Inline comments:
Review comments at @scripts/ci/owned_pool_rescue.py:
- Around line 2503-2505: Update the stalled-watch loop around
rescue_stalled_signing() to continue watching when the result indicates
NIGHTLY_BUSY, as it already does for SIGN_NOT_YET; preserve the existing
deadline check.

After applying the fix, consider running `coderabbit review --agent` for local
review. Visit https://docs.coderabbit.ai/cli?utm_source=ghpr

---

Review info

Run configuration

• Source mode: Auto
• Repository: manaflow-ai/cmux
• Branch: rescue-nightly-never-cancel-started
• File: .coderabbit.yaml
• Commit: 258b3df
• Layers: Repository YAML
• Review profile: ASSERTIVE
• Plan: Advanced
• Run ID: 61ae2bc0-0b64-4cef-9cab-35d76216e87c

Commits

Reviewing files that changed from the base of the PR and between cca6b4e and 258b3df.

Files selected for processing: 2

• scripts/ci/owned_pool_rescue.py
• tests/test_ci_owned_pool_rescue.py

Included review availability: This review used your included allowance. Your plan provides up to 10 included reviews per hour; 3 remain after this review.

[cmux-bot]

cmux status _{(one comment, edited in place; each line is updated by the job that owns it)}

Passes: CI passes on 53a5ab3d52.

CI passes on 53a5ab3d52 (run 40538161551 attempt 1).

Written by scripts/ci/classify_failures.py (ci-failure-attribution.yml); signatures are its SIGNATURES table. A machine verdict is the runner's fault, not this PR's; yours means the failing file is one this PR changes, also red on main that main's latest full suite fails the same way, seen on other PRs that it failed on another pull request's run lately.

CI fast guards passes on 53a5ab3d52 (run). This covers only the fast guards, not CI: CI's result is ci-status.

Merge receipt for 53a5ab3d52: every check was green at merge (10 verified; 16 skipped by policy). Full suite runs on main after merge.