[ci-scan] Test failure: TensorPrimitives.SpanDestinationFunctions_ValueRange (Tan) on iossimulator

[github-actions]

Build Information

Build: https://dev.azure.com/dnceng-public/public/_build/results?buildId=1449088
Build error leg or test failing: iossimulator-arm64 Release AllSubsets_CoreCLR - System.Numerics.Tensors.Tests

Error Details

SingleGenericTensorPrimitives.SpanDestinationFunctions_ValueRange and DoubleGenericTensorPrimitives.SpanDestinationFunctions_ValueRange fail on iOS simulator (arm64) when testing the Tan function. The vectorized Tan implementation produces values with reduced precision compared to the scalar reference on this platform.

[FAIL] System.Numerics.Tensors.Tests.SingleGenericTensorPrimitives.SpanDestinationFunctions_ValueRange(tensorPrimitivesMethod: SpanDestinationDelegate { Method = Void Tan[Single](System.ReadOnlySpan`1[System.Single], System.Span`1[System.Single]), Target = null }, expectedMethod: Func`2 { Method = Single Tan(Single), Target = null }, tolerance: null)
Assert.All() Failure: 153 out of 201 items in the collection did not pass.
       Error: Assert.Equal() Failure: Values differ
              Expected: 0.4103213
              Actual:   0.4103199

[FAIL] System.Numerics.Tensors.Tests.DoubleGenericTensorPrimitives.SpanDestinationFunctions_ValueRange(tensorPrimitivesMethod: SpanDestinationDelegate { Method = Void Tan[Double](System.ReadOnlySpan`1[System.Double], System.Span`1[System.Double]), Target = null }, expectedMethod: Func`2 { Method = Double Tan(Double), Target = null }, tolerance: null)
Assert.All() Failure: 123 out of 201 items in the collection did not pass.
       Error: Assert.Equal() Failure: Values differ
              Expected: 0.4103212990482421

Error Message

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

{
  "ErrorMessage": [
    "[FAIL] System.Numerics.Tensors.Tests.SingleGenericTensorPrimitives.SpanDestinationFunctions_ValueRange",
    "Void Tan[Single]"
  ],
  "ErrorPattern": "",
  "BuildRetry": false,
  "ExcludeConsoleLog": false
}

Impact on platforms

• runtime-extra-platforms (def 154) / iossimulator-arm64 Release AllSubsets_CoreCLR / Helix queue: ubuntu.2204.armarch.open.ios / exit code: non-zero (test failure)

First build it occurred

• Build: https://dev.azure.com/dnceng-public/public/_build/results?buildId=1449088
• Finished: 2026-06-04T09:47:08Z
• Occurrences in window: 2 (builds 1449088 and 1450787)
• Computed within the scanned window; may not be the true origin.

Duplicate search

• SpanDestinationFunctions_ValueRange label:"Known Build Error" — 0 results
• TensorPrimitives Tan iossimulator label:"Known Build Error" — 0 results
• System.Numerics.Tensors.Tests iossimulator — found closed Mono crashes test runs #73539 (Mono crashes, unrelated)
• GenericTensorPrimitives SpanDestinationFunctions is:open — 0 results
• TensorPrimitives SpanDestinationFunctions label:"Known Build Error" — found closed Test failure in System.Numerics.Tensors.Tests.SingleGenericTensorPrimitives.SpanDestinationFunctions_SpecialValues #101731 (SpecialValues, different test)

No existing KBE matches this signature.

---

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Note

🔒 Integrity filter blocked 4 items

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

• #83422 search_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• #86273 search_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• #115508 search_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• #114358 search_issues: 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:

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

Generated by CI Outer-Loop Failure Scanner · ● 72.2M · ◷

Report

Build	Repository	Test	Pull Request
1452386	dotnet/runtime	System.Numerics.Tensors.Tests.WorkItemExecution

Summary

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

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