[CI] Flaky: Mac Catalyst NativeAOT exits 133 in CGImageMetadataTest

[dalexsoto]

Flaky Test Report

Signature: maccatalyst-nativeaot-cgimagemetadata-exit-133
Test/configuration: monotouch-test/Mac Catalyst/Release (trimmable static registrar, NativeAOT) while entering MonoTouchFixtures.CoreGraphics.CGImageMetadataTest
Classification: Genuinely flaky test
First observed: 2026-07-21 12:22 UTC
Latest observed: 2026-08-03 14:27 UTC

Occurrences

PR / head	Azure run / attempt	Job	Outcome
#26180 / 897e85a4b8e8e206c57ea59a7b0c3088abf18e15	14718322 / 1	T: monotouch_maccatalyst (73408371-a55e-5ff5-5372-c49d56cfe7c2)	The NativeAOT process exited 133 while entering CGImageMetadataTest. The same head/configuration had passed in 14716050, and failed-job retry attempt 2 cleared this crash; unrelated jobs kept the overall run failed.
#26379 / d97396de11660c46503461cc61cc6aadc1c56dd4	14850072 / 1	T: monotouch_maccatalyst / Run tests, AcesShared 37	The same configuration exited 133 at CGImageMetadataTest; no crash report was produced.

Total: 2 confirmed occurrences across 2 distinct PRs.

Current diagnostic lines

MonoTouchFixtures.CoreGraphics.CGImageMetadataTest
Process monotouchtest exited with 133
Test run crashed (exit code: 133).
No crash reports

In run 14850072, the neighboring Release (NativeAOT) and Release (NativeAOT, .NET 11 defaults) configurations passed. This isolates the recurrence to the trimmable-static-registrar NativeAOT variation rather than a general NativeAOT build failure.

Impact and retry status

The crash fails the Mac Catalyst test job without an NUnit failure or native crash report. No retry was submitted for #26379 because the same run also has seven deterministic No valid ... code signing keys found in keychain failures; rerunning failed jobs would repeat those failures until the signing bundle is independently validated.

Investigation

• Parsed the TestSummary and HtmlReport execution log for run 14850072.
• Confirmed the stable test/configuration/exit-code signature against the retained [MessageUI] Update bindings up to Xcode 27.0 Beta 3 #26180 occurrence.
• Searched all open and closed issues by exact test name, process exit text, configuration, and CoreGraphics component. monotouch-test: random CoreCLR GC crash (maybe in MonoTouchFixtures.CoreAnimation.LayerTest?) #25171, [CI] Flaky: monotouch-test macOS NativeAOT configurations TimedOut #25687, [CI] Flaky: HarnessException "Unable to evaluate the property OutputPath" (exit code 139) #25860, and [CI] iOS 27 monotouch-test stalls in NSUrlSession redirect tests with simulator daemon crash loops #26221 describe different crash or timeout roots.
• Azure DevOps no longer returns builds 14718322 or 14716050 through the API, so their retained artifacts and task IDs are unavailable due to artifact retention.

Workaround

Retry the failed Mac Catalyst job only when the same run has no deterministic co-failures and retry accounting permits it. No source workaround is known.

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Generated from recurring cross-PR CI monitoring evidence.

[dalexsoto]

Retry outcome for PR #26379 at d97396de11660c46503461cc61cc6aadc1c56dd4:

• Replacement build 14852080 succeeded.
• Replacement simulator run 14852087 succeeded with all 38 jobs passing, including monotouch_maccatalyst.
• Replacement API-diff run 14852088 succeeded.
• PR [docs] Improve XML docs for various types #26379 merged at 2026-08-03 21:03 UTC.

The maccatalyst-nativeaot-cgimagemetadata-exit-133 recurrence was cleared without a source change. The canonical count remains 2 occurrences across 2 PRs.

Additional info to collect: none.