[ci-scan-net11] net11.0 device tests: MacCatalyst Mono Controls Tests times out (XHarness TIMED_OUT, exit 70) — 2 consecutive builds

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Summary

The Controls Tests Helix work item on MacCatalyst (Mono runtime) consistently times out: XHarness kills the process after the 1-hour timeout with exit code 70 (TIMED_OUT). No crash is reported — the app launches but never finishes running all tests.

Build Information

• Pipeline: maui-pr-devicetests (def 314)
• Build: 1455984, 1455596
• Branch: net11.0
• First seen: build 1455596 (2026-06-09)
• Occurrences: 2 in last 2 builds (1455596, 1455984)

Affected Legs

• DeviceTestsMacCatalyst (Windows) — Helix queue osx.26.arm64.open, Mono runtime
• Work item: Controls Tests (exit code 70 = TIMED_OUT)

Error Message

[XHarness] apple test --target maccatalyst --timeout 01:00:00 --launch-timeout 00:06:00 ...
[09:27:42] dbug: Process 23890 didn't exit within 01:00:00 and will be killed
[09:27:44] dbug: 23890 Execution timed out after 3600 seconds and the process was killed.
[09:27:44] dbug: No crash reports, waiting 5 seconds for the crash report service...
XHarness exit code: 70 (TIMED_OUT)

Helix job: edfa0655-daae-4051-b831-2b327a36669e (build 1455596)

Recommended Action

1. Fetch the full XHarness output log from the Helix console to find the last test that ran before the timeout — this identifies the test that is stuck.
2. Investigate whether a specific test in Controls.DeviceTests (Mono, MacCatalyst) has an infinite loop, deadlock, or hanging await on a UI thread.
3. Compare with the CoreCLR variant (DeviceTestsMacCatalyst_CoreCLR) — if CoreCLR passes, the issue may be Mono-specific dispatch or threading.
4. Check src/Controls/tests/DeviceTests/ for recent changes to controls that run long test suites on macOS.

Note: This is distinct from issue #103 (MacCatalyst CoreCLR osx.15.arm64.maui.open queue stall) — this failure is on Mono runtime on osx.26.arm64.open and is a process timeout, not a queue availability issue.

Area: src/Controls/tests/DeviceTests/ (MacCatalyst/Mono), eng/helix_xharness.proj

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