[pdfinn]

Summary

iOS Build & Simulator Test fails on and off, in 5 of the last 30 CI runs. That includes master (86de120 and 62ce2a6) and branches that change nothing on iOS: #1054 twice, plus an earlier claude/kind-euler-f3ufm5 head. Every failure looks the same:

• xcrun simctl launch --console-pty writes nothing for the whole 60 s cap. The app's first line never appears, and neither does the os.infernode.ios: <pid> line simctl prints once it has started an app. simctl never started the app.
• The watchdog fires at exactly 60 s (03:41:49 → 03:42:50, 04:25:19 → 04:26:20, 07:28:43 → 07:29:43), and the step reports VERIFY FAILED: expected test PASS output not found.

A passing launch writes InferNode: emu_run(...) at once and the test's PASS within 5–9 s (five passing runs measured today). So the 60 s cap is not too tight. This is a launch that never happens.

Changes

build-ios-app.sh --verify:

• If a launch has written nothing after 20 s, it is stopped, the app is terminated, and it is launched again, up to 3 launches.
• A launch that has written something gets the full 60 s, as before. An app that starts and doesn't pass fails at once and is not retried, so real faults still fail.
• On failure, the step prints the number of launches, the booted devices, the app's container, and any InferNode crash report. The next failure will say more than "not found".

The root cause in CoreSimulator is not established; this handles the failure mode as observed, and the added output is there to catch the cause.

Testing

• bash -n build-ios-app.sh.

• The verify step was run on Linux against a stand-in xcrun that reproduces the observed hang (writes nothing, never returns), with the waits scaled down:

  stand-in xcrun	result	launches
  passes	OK	1
  first launch hangs, second passes	OK	2
  every launch hangs	FAIL	3
  starts, then fails	FAIL	1

• Not run on macOS. This PR's own iOS job is the first real run.

Checklist

• Code follows the existing style of the file(s) modified
• No .dis build artifacts committed from appl/ or tests/
• Documentation updated (if applicable): n/a
• No secrets, API keys, or credentials included

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Generated by Claude Code