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ci: run the test suite under AddressSanitizer - #487
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The Test job becomes a two-entry matrix: the existing run, still named Test, and Test (ASan), the same xcodebuild invocation with -enableAddressSanitizer YES. Use-after-free and double-free bugs in the runtime are usually silent in a plain run, so a spec written for one (the nested-worker teardown spec from #479) passes there with or without its fix. Artifact names are unique per workflow run, so the ASan entry uploads test-results-asan and test-diagnostics-asan, and collect-test-diagnostics takes the artifact name as an input. Five worker quality-of-service specs cannot hold in an instrumented build: a worker asked for default or utility reads back user-initiated. They are reported as skipped there, keyed on a new TNSIsAddressSanitizerEnabled() test fixture, and run unchanged everywhere else.
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Included review availability: This review used your included allowance. Your plan provides up to 2 included reviews per hour; 0 remain after this review. 📝 WalkthroughWalkthroughCI now runs standard and AddressSanitizer test variants with variant-specific artifacts. Worker QoS tests detect AddressSanitizer builds. The module test server binds to a system-assigned port, which its test uses in the report base URL. ChangesAddressSanitizer Test Execution
Dynamic Test Server Port
Priority: ⬇️ Low Estimated code review effort: 3 (Moderate) | ~20 minutes Change: Other Sequence Diagram(s)sequenceDiagram
participant PullRequestWorkflow
participant XcodeTest
participant CollectTestDiagnostics
participant ArtifactStorage
PullRequestWorkflow->>XcodeTest: Run standard or AddressSanitizer test variant
XcodeTest-->>PullRequestWorkflow: Return test results and diagnostics
PullRequestWorkflow->>CollectTestDiagnostics: Provide variant-specific artifact name
CollectTestDiagnostics->>ArtifactStorage: Upload diagnostics artifact
Merge Risk: ⚪ Minimal · up to The test server reports startup failures without crashing the runner, and the test uses its assigned port. No merge-blocking issue remains identified. Security Architecture ReviewSecurity architecture risk: 🔵 Low · up to The changes improve test isolation without expanding the inspected CI permissions or network exposure. No introduced security concern was established. Complete security coverage and merge-time enforcement of the sanitizer run remain unconfirmed. Retained concerns Security review detailsSecurity Blast Radius
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Trust Boundaries and Controls
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🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
✨ Finishing Touches 💡 1📝 Generate docstrings 💡
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The XCTest harness served the junit report and the HTTP module fixtures on a fixed loopback port. Simulators share the host's loopback interface, so two suite runs on one machine, even on different simulators, could deliver one run's report to the other's listener. The listener now binds a port chosen by the system and hands it to the app through REPORT_BASEURL, which is already the only way the app learns the address. start() blocks until the listener is bound, since the port is only known then, and throws when binding fails instead of leaving the failure unobserved.
The port is assigned by the system at bind time, so the run's output is the only place to find it when poking at the server by hand.
edusperoni
marked this pull request as ready for review
October 5, 2026 17:36
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Review comments at @TestRunnerTests/TestRunnerTests.swift:
- Line 195: Move the server startup from the current setup path into XCTest’s
setUpWithError() and call server.start() with try instead of try!, so startup
errors are recorded as test failures and teardown can run.
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.github/actions/collect-test-diagnostics/action.yml.github/workflows/pull_request.ymlTestFixtures/TNSTestCommon.hTestFixtures/TNSTestCommon.mTestFixtures/exported-symbols.txtTestRunner/app/tests/WorkerOptionsTests.jsTestRunnerTests/ModuleTestServer.swiftTestRunnerTests/TestRunnerTests.swift
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Setup moves to setUpWithError() so a listener that fails to bind, or does not become ready in time, is recorded by XCTest as a failure of the test instead of crashing the runner through try!. tearDown() tolerates a server that was never created, since it still runs after a throwing setup.
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Runs the TestRunner suite a second time under AddressSanitizer on every pull request.
Why
Most of the recent lifetime fixes in the runtime (#456, #457, #469, #475, #479) are use-after-free or double-free bugs that are usually silent in a plain run. The nested-worker teardown spec added in #479 is the clearest case: it only aborts on the unfixed code when the TestRunner is built with ASan, so in CI it passes with or without the fix.
What changes
pull_request.yml: theTestjob becomes a two-entry matrix.Testis the existing run, with the same check name and artifact names as before.Test (ASan)is the samexcodebuildinvocation plus-enableAddressSanitizer YES. It uploadstest-results-asanandtest-diagnostics-asan.fail-fastis off, so one entry failing does not cancel the other.collect-test-diagnostics: takes the artifact name as an input (default unchanged), because artifact names are unique per workflow run.npm_release.ymlkeeps using the default.WorkerOptionsTests.js: five worker quality-of-service specs are reported as skipped in an ASan build. A worker asked fordefaultorutilityreads back user-initiated (25) there; theuserInteractiveanduserInitiatedspecs still run. Everywhere else the specs run unchanged.TNSIsAddressSanitizerEnabled(), a compile-time__has_feature(address_sanitizer)check, so the skip also applies when ASan is switched on from the Xcode scheme rather than from CI.No scheme or project settings change, and the release workflow is untouched.
Test server port (second commit)
The XCTest harness served the junit report and the HTTP module fixtures on a fixed loopback port (63846). Simulators share the host's loopback interface, so two suite runs on one machine could deliver one run's report to the other's listener, even on different simulators.
ModuleTestServernow binds a port chosen by the system. The app already learns the address only throughREPORT_BASEURL, so nothing else changes and there is nothing to configure.start()blocks until the listener is bound, because the port is only known then, and throws when binding fails. A bind failure was previously unobserved. Setup runs insetUpWithError(), so such a failure is recorded as a test failure rather than crashing the runner.ModuleTestServer listening on 127.0.0.1:<port>) so it can be found in a run's output.Scope of the instrumentation
Only code compiled in this build is instrumented: the runtime and the test fixtures. The prebuilt V8 archives are not, so this catches bad accesses made by the runtime's own code, not bugs inside V8 or on the JS heap.
Verification
Local, iOS 18.5 simulator, Xcode 26.3:
mainbefore this changeThe ASan run predates the port commit, which only touches the Swift harness; the
Test (ASan)check on this PR covers the two together.The ASan binary was confirmed to link
libclang_rt.asan_iossim_dynamic.dylib. The suite itself took about a minute in both configurations, so the existing step timeouts are left as they are.Notes for review
maintoday, soTest (ASan)reports its own status without blocking merges.max_attempts: 2retry. That keeps simulator flakes from turning it red, at the cost that an intermittent sanitizer abort can pass on the retry; the first attempt's result bundle is still uploaded in that case.Summary by CodeRabbit