[ci-scan] Test failure: AsyncEnumerableTests.SerializeAsyncEnumerable_PartialItemFailure_PriorItemsAreFullyWritten on tvOS

[github-actions]

Build Information

Build: https://dev.azure.com/dnceng-public/public/_build/results?buildId=1438268
Build error leg or test failing: tvos-arm64 Release AllSubsets_Mono - System.Text.Json.Tests

Error Details

[FAIL] System.Text.Json.Serialization.Tests.AsyncEnumerableTests_AsyncPipeSerializer.SerializeAsyncEnumerable_PipeWriter_TopLevelValues_PartialItemFailure_PriorItemsAreFullyWritten
Expected: typeof(System.InvalidOperationException)
Actual:   typeof(System.Reflection.TargetInvocationException)

Multiple variants affected: AsyncEnumerableTests_AsyncPipeSerializer, AsyncEnumerableTests_AsyncStream (both PipeWriter and non-PipeWriter variants).

Error Message

true only for clear infra flakes. ExcludeConsoleLog skips helix log scanning. -->

{
  "ErrorMessage": ["PartialItemFailure_PriorItemsAreFullyWritten", "Actual:   typeof(System.Reflection.TargetInvocationException)"],
  "ErrorPattern": "",
  "BuildRetry": false,
  "ExcludeConsoleLog": false
}

Impact on platforms

• runtime-extra-platforms (def 154) / tvos-arm64 Release AllSubsets_Mono / System.Text.Json.Tests / Exit code 1
• Occurrences in window: 3+ (builds 1436493, 1438268, 1440191)

First build it occurred

• Build: https://dev.azure.com/dnceng-public/public/_build/results?buildId=1433744
• Finished: 2026-05-25T09:02:27Z
• Persistent across the entire scanned window; true origin may predate 2026-05-24.

---

Filed by ci-failure-scan, which scans dnceng-public outer-loop pipelines on main and converts stable failures into KBEs and test-disable PRs.

Generated by CI Outer-Loop Failure Scanner · ● 16.3M · ◷

Report

Build	Repository	Test	Pull Request
1455809	dotnet/runtime	System.Text.Json.Serialization.Tests.AsyncEnumerableTests_AsyncPipeSerializer.SerializeAsyncEnumerable_TopLevelValues_PartialItemFailure_PriorItemsAreFullyWritten	#128409
1455366	dotnet/runtime	System.Text.Json.Tests.WorkItemExecution
1453379	dotnet/runtime	System.Text.Json.Tests.WorkItemExecution
1452872	dotnet/runtime	System.Text.Json.Tests.WorkItemExecution

Summary

24-Hour Hit Count	7-Day Hit Count	1-Month Count
0	0	4

[dotnet-policy-service]

Tagging subscribers to 'os-ios': @vitek-karas, @kotlarmilos, @steveisok, @akoeplinger
See info in area-owners.md if you want to be subscribed.

[dotnet-policy-service]

Tagging subscribers to this area: @dotnet/area-system-text-json
See info in area-owners.md if you want to be subscribed.