[ci-scan] Test failure: Runtime_105619.Program.TestEntryPoint on Mono MiniFullAot

[github-actions]

Build Information

Build: https://dev.azure.com/dnceng-public/public/_build/results?buildId=1453379
Build error leg or test failing: linux-x64 Release AllSubsets_Mono_MiniFullAot_RuntimeTests minifullaot - Regression_o_2

Error Details

Runtime_105619.Program.TestEntryPoint() returns exit code 22 instead of expected 100 under Mono MiniFullAot (full AOT) on linux-x64. The test is part of the JIT/Regression/Regression_o_2 merged test assembly.

Running test: global::Runtime_105619.Program.TestEntryPoint()
Exit Code: 22
Expected: 100
Actual: 22
END EXECUTION - FAILED

First build it occurred: https://dev.azure.com/dnceng-public/public/_build/results?buildId=1450787
Persistent across the entire scanned window; true origin may predate 2026-06-05.

Confirmed in follow-up build: https://dev.azure.com/dnceng-public/public/_build/results?buildId=1455366

Error Message

{
 "ErrorMessage": ["Runtime_105619.Program.TestEntryPoint()", "Actual: 22"],
 "ErrorPattern": "",
 "BuildRetry": false,
 "ExcludeConsoleLog": false
}

---

Filed by ci-failure-scan (detection only). ci-failure-fix walks open [ci-scan] KBEs and either opens a small fix PR or comments here to loop in owners — it never disables the test.

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🔒 Integrity filter blocked 6 items

The following items were blocked because they don't meet the GitHub integrity level.

• #125825 search_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• #128392 search_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• #85747 search_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
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Generated by CI Outer-Loop Failure Scanner · ● 60.5M · ◷

Report

Build	Repository	Test	Pull Request
1538739	dotnet/runtime	Regression_o_2.WorkItemExecution	#129506

Summary

24-Hour Hit Count	7-Day Hit Count	1-Month Count
0	0	1

[github-actions]

Workflow artifact: ci-fix
Artifact kind: handoff
Linked KBE: #129170

Note

AI/Copilot-generated triage note.

This Known Build Error has no producible automated code change (reason: Mono AOT codegen/runtime issue — the test uses CollectibleALC and reflection patterns that interact with Mono Full AOT in ways that cannot be fixed by a test-only change, and modifying Mono AOT internals exceeds automated bounds), so I could not open even a best-effort PR. Looping in owners so it can be fixed forward rather than muted.

Root cause (best analysis)

Runtime_105619.Program.TestEntryPoint() returns exit code 22 (instead of expected 100) on Mono MiniFullAot (linux-x64 Release). The test is a Fuzzlyn-generated JIT regression test that:

1. Creates a CollectibleALC (collectible AssemblyLoadContext)
2. Loads the current assembly into it via Assembly.GetExecutingAssembly().Location
3. Reflects and invokes MainInner in the loaded assembly context
4. The entire operation is wrapped in try { ... } catch {}

On Mono Full AOT, this test returns exit code 22 consistently. Possible causes:

• Assembly.GetExecutingAssembly().Location returns empty string on Full AOT (no physical assembly file), causing LoadFromAssemblyPath("") to throw — which should be caught by the try/catch
• The merged test runner infrastructure may handle the test entry differently under MiniFullAot, producing exit code 22 for a type-load or method-preparation failure before the try block executes
• Collectible AssemblyLoadContext may not be fully supported under Mono Full AOT

The test has an existing [ActiveIssue] skip for WASM (issue #124219), suggesting cross-platform incompatibility is known for this pattern.

Evidence

• Failing build: https://dev.azure.com/dnceng-public/public/_build/results?buildId=1453379
• First build it occurred: build 1450787, 2026-06-05 (computed within the scanned window; may not be the true origin)
• Persistent across all scanned builds (11 occurrences in 1-month window)
• Possible related PR: none identified with sufficient confidence

Suggested reviewers / area contacts

• Area owners (area-Codegen-AOT-mono): @kotlarmilos
• Lead: @steveisok

A fix would likely involve either ensuring CollectibleALC operations fail gracefully under Mono Full AOT (so the try/catch works correctly), or adjusting the merged test runner to handle this test pattern appropriately on MiniFullAot builds.

Note

🔒 Integrity filter blocked 2 items

The following items were blocked because they don't meet the GitHub integrity level.

• #128501 search_pull_requests: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• [ci-scan] Test failure: CryptoStreamTests.ReadWrite_Success MemberData not found on maccatalyst #128451 issue_read: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".

To allow these resources, lower min-integrity in your GitHub frontmatter:

tools:
 github:
 min-integrity: approved # merged | approved | unapproved | none

Generated by CI Outer-Loop Failure Fixer · ● 20.1M · ◷

[github-actions]

Workflow artifact: ci-fix
Artifact kind: handoff
Linked KBE: #129170

Note

AI/Copilot-generated triage note.

This Known Build Error has no producible automated code change (reason: Mono full-AOT codegen — must not be auto-fixed, and workarounds in unrelated code are equally out of bounds), so I could not open even a best-effort PR. Looping in owners so it can be fixed forward rather than muted.

Root cause (best analysis)

Runtime_105619.Program.TestEntryPoint() (part of the JIT/Regression/Regression_o_2 merged assembly) returns exit code 22 instead of 100 under Mono MiniFullAot (full AOT) on linux-x64:

Running test: global::Runtime_105619.Program.TestEntryPoint()
Exit Code: 22 / Expected: 100

A JIT regression test producing a wrong result (not a crash) only in the Mono full-AOT configuration is a Mono AOT codegen miscompilation of the code pattern that Runtime_105619 was written to exercise. Per workflow rules, JIT/GC/AOT codegen fixes are out of bounds for an automated PR, and I must not sidestep the codegen bug by editing the test's code pattern. This needs a Mono AOT compiler investigation.

Evidence

• Failing build: https://dev.azure.com/dnceng-public/public/_build/results?buildId=1453379 (confirmed in 1455366)
• First build it occurred: build 1450787 (2026-06-05 window) — persistent across the window; true origin may predate it.
• Possible related PR: none identified with sufficient confidence. The original issue the test guards is JIT: [arm32] Assertion failed 'varDsc->IsAlwaysAliveInMemory() || ((regSet.GetMaskVars() & regMask) == 0)' during 'Generate code' #105619.

Suggested reviewers / area contacts

• Area owners (area-Codegen-AOT-mono): @steveisok, @kotlarmilos

A fix likely involves diffing Mono MiniFullAot codegen for the Runtime_105619 pattern against the interpreter/JIT result to locate the miscompilation that yields 22 instead of 100.

Warning

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• awmgmcpg

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Generated by CI Outer-Loop Failure Fixer · 339.4 AIC · ⌖ 21 AIC · ⊞ 17.1K · ◷