test: make sure the late-burst port test reaches its fifth lsof call - #16155
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"A single late-burst kick still retires a stopped listener" stops the fake listener and sends the late kick from inside the fifth lsof call. That assumes every burst timer gets its own scan. A kick owes only three scans, and timers that fire while a scan is running merge into one rescan, so once scans take about 0.3 s the burst runs three or four scans, pays off the kick and goes idle. The fifth call never comes, the listener never stops and the test waits out its 12 s. That happened on a loaded cmux9s in #15488's validation run, where the next test also ran 2.5 times slower than usual. A second kick from inside the second lsof call now owes the third to fifth scans, so the fifth call always happens. With one scan per timer that kick is paid off by the fifth scan, so the late kick still arrives with nothing owed and one scan left in the burst, as before. The fake's stop hook becomes a general per-call hook, and the failure message reports how many lsof calls ran. Refs #15488 Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Included review availability: This review used your included allowance. Your plan provides up to 10 included reviews per hour; 2 remain after this review. 📝 WalkthroughWalkthroughThe port scanner test fixture now supports actions scheduled for specific listener lookups, with optional listening shutdown. The late-burst test schedules kicks during the second and fifth lookups and includes the lookup count in its retirement failure message. ChangesPort scanner test scheduling
Priority: ⬇️ Low Estimated code review effort: 2 (Simple) | ~10 minutes Change: Other Suggested reviewers: Merge Risk: ⚪ Minimal · up to The added kick keeps the late listener-stop scenario reachable under the intended schedule; no material current-head merge risk is established. 🚥 Pre-merge checks | ✅ 24 | ❌ 1❌ Failed checks (1 warning)
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Review comments at @cmuxTests/PortScannerTests.swift:
- Line 1398: Add a completion boundary in the test after the invocation-2 action
calls scanner.kick, and wait for that panel scan to finish before relying on
invocation 5. Use the scanner’s existing scan-completion mechanism so later
timer callbacks cannot coalesce while the invocation-2 scan is still in flight.
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cmuxTests/PortScannerTests.swift
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| } | ||
| // Burst timers that fire during a slow scan merge, so a loaded host could pay off the first kick | ||
| // before a fifth `lsof` call. A kick from inside the second call owes the third through fifth scans. | ||
| await runner.perform(atLsofInvocation: 2) { scanner.kick(workspaceId: workspaceId, panelId: panelId) } |
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🩺 Stability & Availability | 🟡 Minor | ⚡ Quick win
Synchronize the invocation-2 kick before relying on invocation 5.
runner.perform(atLsofInvocation: 2) waits only for the action to run. The action dispatches scanner.kick asynchronously. Later timer callbacks can therefore run while the panel scan is still in flight, and beginPanelScan() coalesces those callbacks. The test does not guarantee that the fifth lsof invocation occurs, so its retirement wait can time out before the invocation-5 stop and kick run.
Add a completion boundary for the scan started by the invocation-2 action before the test depends on invocation 5.
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Review comment at @cmuxTests/PortScannerTests.swift at line 1398:
Add a completion boundary in the test after the invocation-2 action calls
scanner.kick, and wait for that panel scan to finish before relying on
invocation 5. Use the scanner’s existing scan-completion mechanism so later
timer callbacks cannot coalesce while the invocation-2 scan is still in flight.
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review. Visit https://docs.coderabbit.ai/cli?utm_source=ghpr
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Pre-merge review (correctness first, subagent): approve, no defects.
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#10277 replaced the fake runner's lsof stand-in with a stand-in for the kernel port lookup, keeping the late-burst test's fifth-call trigger and so its race. The conflict in cmuxTests/PortScannerTests.swift resolves to main's version with this branch's change ported onto it: a general per-lookup hook, perform(atListenerLookup:stopsListening:_:), a kick from inside the second port lookup, and the lookup count in the failure message.
#15353 rewrote the late-burst test's fixture again, now reading the process table from the kernel too, and kept the fifth-lookup trigger and so its race. cmuxTests/PortScannerTests.swift resolves to main's version with this branch's change ported onto it: the per-lookup hook perform(atListenerLookup:stopsListening:_:), a kick from inside the second port lookup, and the lookup count in the failure message.
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PortScannerPortRetirementTests"A single late-burst kick still retires a stopped listener" failed in the #15488 validation run (shard 2 of run 36749306412):didRetirePortwas false after its 12 s wait. The scanner is right; the test's setup can miss its own trigger on a loaded host. Part of #15488.Why it failed
The test stops the fake listener and sends the late kick from inside the fifth
lsofcall. That assumes every burst timer gets its own scan, but the scanner doesn't promise that:minimumScansPerKick).[0.05, 0.15, 0.3, 0.45, 0.6, 1.6], so its timers are 100–150 ms apart.Once a scan takes about 0.3 s, the burst runs three or four scans, pays off the kick and goes idle. The fifth call never happens, the listener never stops, and the test waits out 12 s. The failing run took 12.675 s, and the next test in the suite ran 2.5 times slower than its usual 1.0–1.1 s. That runner, cmux9s, was running five jobs at the time. The test passed in the 84 other runs of its current form found in main and
full-cilogs.Change
lsofcall owes the third to fifth scans, so the fifth call always happens.perform(atLsofInvocation:stopsListening:_:).lsofcalls ran.The assertion and the 12 s bound are unchanged.
Evidence
Both runs make every fake
lsofcall take 400 ms, as on a loaded host. They use diag refs over main's 4df2a40 app products (run 36748094366) withapp-host-test-rerun.yml:diag/15488-portscan-red, run 36761557344, cmux8s)PortScannerTests.swift:1418:9: Expectation failed: didRetirePortafter 12.48 s each, the CI failurediag/15488-portscan-green, run 36761562215, cmux7s)No local build or test run; this Mac does not compile cmux.
#15353 and #10277 rewrite this fake around a kernel lookup and keep the same trigger, so whichever lands second needs the same extra kick.
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@codesmith-botwith what you need. Autofix is disabled.Summary by cubic
Fixes the flaky late-burst port retirement test so it always reaches its fifth port lookup, even on a loaded host.
Written for commit 112e9a3. Summary will update on new commits.
Summary by CodeRabbit