Avoid async IPC panic on peer close - #64142
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Track in-flight request handlers and propagate response write failures through Run instead of panicking from detached goroutines. Cancel handlers during connection shutdown and preserve concurrent errors.
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Jake Bailey (jakebailey)
September 3, 2026 04:36
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🟡 Changes recommended
The critical unbounded teardown wait must be fixed and covered by a regression test.
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Pull request overview
Prevents async IPC response-write panics after peer closure, but introduces potentially indefinite teardown blocking.
Changes:
- Propagates response-write failures through
Run. - Adds a peer-close regression test.
File summaries
| File | Description |
|---|---|
tsc/internal/ipc/conn_async.go |
Tracks handlers, but synchronously waiting can block teardown indefinitely. |
tsc/internal/ipc/conn_async_test.go |
Tests peer closure, but does not cover a handler remaining blocked. |
Review details
- Files reviewed: 2/2 changed files
- Comments generated: 1
- Review effort level: Balanced
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Report completed request errors without synchronously draining request handlers during connection teardown. Cover peer closure while a handler remains blocked.
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Jake Bailey (jakebailey)
September 3, 2026 16:18
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🟡 Changes recommended
The terminal error must include the request-handler failure before pending calls are closed.
Once you've addressed the issues Copilot identified, you can request another Copilot review.
Review details
- Files reviewed: 2/2 changed files
- Comments generated: 1
- Review effort level: Balanced
Join a completed request-handler failure before recording the connection's terminal error so later calls observe the cause that closed the transport.
Update connection terminal state when a request response write fails, including after Run has returned, so later calls retain the transport failure.
Record response-write failures in terminal connection state before returning from request handling, eliminating the observer race found during review.
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Jake Bailey (jakebailey)
September 3, 2026 16:49
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This tries to fix the race condition hit in CI: https://github.com/microsoft/TypeScript/actions/runs/33681309624/job/100418285983