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ChangesTranscript teardown
Priority: ⬇️ Low Estimated code review effort: 2 (Simple) | ~10 minutes Change: Bug fix · Severity of issue fixed: Low Suggested reviewers: Merge Risk: 🔵 Low · up to The regression test may pass before transcript cleanup completes, reducing confidence that future teardown regressions will be detected. Merge risk is low, but the test should await cleanup explicitly. Important Pre-merge checks failedPlease resolve all errors before merging. Addressing warnings is optional. ❌ Failed checks (1 error, 1 warning)
✅ Passed checks (23 passed)
Full details: Cmux Swift ConcurrencyExplanation The production diff adds an unstructured fire-and-forget Resolution Replace the unowned teardown task with an explicit owner-managed cleanup operation that has a stored and cancellable task handle, or use a narrowly scoped allowed main-queue/actor hop for this required isolation boundary without introducing an untracked task. Preserve synchronous teardown when already on the main thread.
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Inline comments:
In `@Sources/Mobile/AgentChat/AgentChatTranscriptService.swift`:
- Around line 706-727: Add a focused regression test for
AgentChatTranscriptService deinitialization from a non-main concurrency context,
ensuring the service release does not trap and that its proseWakeDriver and
proseStreamer cleanup invokes stop and stopAll. Avoid manually calling stopAll
in the test; verify cleanup is triggered by deinit.
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Sources/Mobile/AgentChat/AgentChatTranscriptService.swift
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`AgentChatTranscriptService.deinit` stops its prose streaming inside `MainActor.assumeIsolated`, which traps when the last reference is dropped on another thread. An `AppDelegate` created by a unit test can be released from a Swift concurrency thread, and three test-host crashes came from this deinit. This test creates the service on the main actor, keeps only an unmanaged reference, and releases it from a background thread. It crashes the test host until the next commit makes the deinit safe off the main thread.
…n thread `AgentChatTranscriptService.deinit` stops its prose wake driver and streamer inside `MainActor.assumeIsolated`, on the assumption that the service is always released on the main actor. `AppDelegate` owns the service, and an `AppDelegate` created by a unit test can be released from a Swift concurrency thread. When that happened, `assumeIsolated` trapped during `AppDelegate.__ivar_destroyer` and crashed the test host. Keep the synchronous stop on the main thread, and otherwise hand both objects to a main-actor task that stops them there.
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Inline comments:
In `@cmuxTests/AgentChatSessionRegistryLifecycleReviewRegressionTests.swift`:
- Line 33: Update the lifecycle test to signal completion only after MainActor
cleanup finishes in stopProseStreaming, rather than immediately after
lastReference.release() returns. Replace the blocking released semaphore wait
with an async completion signal and await/assert it without blocking the
`@MainActor` test, preserving the five-second timeout behavior.
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cmuxTests/AgentChatSessionRegistryLifecycleReviewRegressionTests.swift
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Thank you for this! You had it first, and main has the same fix now (b65dde5), so I'm closing this one as done. Appreciate it :) |
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Summary
Releasing an
AppDelegateoff the main thread crashes the process. Three crash reports showSIGTRAPinMainActor.assumeIsolatedinsideAgentChatTranscriptService.deinit, called fromAppDelegate.__ivar_destroyer. Unit tests that create their ownAppDelegatecan release it from a Swift concurrency thread.The deinit stops the prose wake driver and streamer inside
MainActor.assumeIsolated, which assumes the service is always released on the main actor.The deinit still stops both synchronously on the main thread. Anywhere else it hands them to a main-actor task that stops them there.
Testing
4638e5b1eaplus the compile fixes in Fix the compile errors that keep main and its unit tests from building #12584, throughscripts/ci/run-app-host-xcodebuild.shin 12 batches the way CI runs app-host tests, three crash reports show this trap, and hosts died in batches 9, 11 and 12.assumeIsolatedtrap.assumeIsolatedtrap, and macOS saved no crash report for this teardown.Demo Video
Not applicable. The change prevents a crash and has no visible effect.
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@codesmith-botwith what you need. Autofix is disabled.Summary by cubic
Fixes a crash when
AgentChatTranscriptServiceis released off the main thread. Previouslydeinitassumed it ran on the main actor and trapped inMainActor.assumeIsolated, crashing the test host when a test-ownedAppDelegatewas released from a Swift concurrency thread. The service now stops the prose wake driver and streamer synchronously on the main thread when possible, and otherwise hands them to a main-actor task to stop there. Adds a regression test that releases the service from a background thread and waits for that release without blocking the main actor.Written for commit 43f80cb. Summary will update on new commits.
Summary by CodeRabbit