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[ci-scan] Test failure: System.Net.Tests.HttpResponseStreamTests.Write_ContentToClosedConnectionSynchronously_ThrowsHttpListener [Content truncated due to length] #130278

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[ci-scan] Test failure: System.Net.Tests.HttpResponseStreamTests.Write_ContentToClosedConnectionSynchronously_ThrowsHttpListener [Content truncated due to length]#130278
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Known Build ErrorUse this to report build issues in the .NET Helix tabagentic-workflowsarea-System.Net

Description

@github-actions
github-actions
bot
opened on Jul 7, 2026

Build Information

Build: https://dev.azure.com/dnceng-public/public/_build/results?buildId=1494308
Build error leg or test failing: maccatalyst-x64 Release AllSubsets_NativeAOT - System.Net.HttpListener.Tests

Error Details

On the Apple NativeAOT library-test legs (maccatalyst / iossimulator AllSubsets_NativeAOT), HttpResponseStreamTests.Write_ContentToClosedConnectionSynchronously_ThrowsHttpListenerException fails its Assert.Throws check. Writing to an already-closed connection does not raise on the Darwin/Apple socket stack, so the expected HttpListenerException is never thrown:

[FAIL] System.Net.Tests.HttpResponseStreamTests.Write_ContentToClosedConnectionSynchronously_ThrowsHttpListenerException(ignoreWriteExceptions: False)
Assert.Throws() Failure: No exception was thrown
Expected: typeof(System.Net.HttpListenerException)
   at System.Net.Tests.HttpResponseStreamTests.<Write_ContentToClosedConnectionSynchronously_ThrowsHttpListenerException>d__20.MoveNext() in /_/src/libraries/System.Net.HttpListener/tests/HttpResponseStreamTests.cs:line 449

The test carries [ActiveIssue(".../issues/21590", TestPlatforms.OSX | TestPlatforms.FreeBSD)], but that skip does not include TestPlatforms.MacCatalyst, so it runs and fails on the maccatalyst NativeAOT leg. NativeAOT library tests on Apple mobile were newly enabled by #125437 (merged 2026-07-02); the failure first appears on build 1492684 (2026-07-03) and reproduces on follow-up build 1494829. The ...Asynchronously... sibling variant of the same behavioural difference is catalogued in the Apple-mobile NativeAOT tracker #126697. Sibling Apple-NativeAOT library-test failures from the same source build are tracked by #130253 and #130254.

First build it occurred: https://dev.azure.com/dnceng-public/public/_build/results?buildId=1492684

Related: #126697

Error Message

{
  "ErrorMessage": [
    "[FAIL] System.Net.Tests.HttpResponseStreamTests.Write_ContentToClosedConnectionSynchronously_ThrowsHttpListenerException",
    "Expected: typeof(System.Net.HttpListenerException)"
  ],
  "ErrorPattern": "",
  "BuildRetry": false,
  "ExcludeConsoleLog": false
}

Note

🔒 Integrity filter blocked 31 items

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

  • #107364 search_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
  • #107364 issue_read: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
  • #114222 search_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
  • #127541 search_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
  • #112093 search_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
  • #119449 search_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
  • #130105 search_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
  • #93686 search_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
  • #76917 search_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
  • #71338 search_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
  • #83890 search_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
  • #71472 search_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
  • #78657 search_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
  • #80356 search_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
  • #10055 search_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
  • #56073 search_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
  • ... and 15 more items

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

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

Generated by CI Outer-Loop Failure Scanner · ● 18.6M · ◷

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Summary

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

Activity

  1. github-actions
    added
    blocking-clean-ciBlocking PR or rolling runs of 'runtime' or 'runtime-extra-platforms'
    Known Build ErrorUse this to report build issues in the .NET Helix tab
    agentic-workflows
    on Jul 7, 2026
  2. dotnet-policy-service
    added
    untriagedNew issue has not been triaged by the area owner
    on Jul 7, 2026

  3. JulieLeeMSFT commented on Jul 7, 2026

    @JulieLeeMSFT
    JulieLeeMSFT
    on Jul 7, 2026
    Member

    @kotlarmilos, please activate area bot for these new issues.

  4. JulieLeeMSFT
    added
    area-System.Net
    and removed
    untriagedNew issue has not been triaged by the area owner
    on Jul 7, 2026

  5. dotnet-policy-service commented on Jul 7, 2026

    @dotnet-policy-service
    dotnet-policy-servicebot
    on Jul 7, 2026 – with Dotnet Policy Service
    Contributor

    Tagging subscribers to this area: @karelz, @dotnet/ncl
    See info in area-owners.md if you want to be subscribed.

  6. github-actions commented on Jul 8, 2026

    @github-actions
    github-actionsbot
    on Jul 8, 2026 – with GitHub Actions
    ContributorAuthor

    Workflow artifact: ci-fix
    Artifact kind: handoff
    Linked KBE: #130278

    Note

    AI/Copilot-generated root-cause hand-off (ci-failure-fix). No automated code change was produced: the only in-bounds options would be to extend an [ActiveIssue] skip to MacCatalyst (muting) or to change Darwin socket behavior (out of bounds), so I am looping in owners instead.

    Root cause (read-only analysis)

    On the Apple NativeAOT library-test legs (maccatalyst / iossimulator AllSubsets_NativeAOT, build 1494308), System.Net.Tests.HttpResponseStreamTests.Write_ContentToClosedConnectionSynchronously_ThrowsHttpListenerException fails:

    Assert.Throws() Failure: No exception was thrown
Expected: typeof(System.Net.HttpListenerException)
   at .../HttpResponseStreamTests.cs:line 449

    The test writes to an already-closed connection and expects an HttpListenerException. On the Darwin/Apple socket stack the synchronous write to a closed connection does not raise, so no exception is thrown and the assert fails.

    The test already carries [ActiveIssue(".../issues/21590", TestPlatforms.OSX | TestPlatforms.FreeBSD)], but that platform mask does not include TestPlatforms.MacCatalyst, so it runs on the maccatalyst leg. This is the same behavioral difference already catalogued (async sibling) in #126697.

    Both conceivable changes are out of scope for this workflow:

    • Extending the [ActiveIssue] mask to MacCatalyst would mute the test — not allowed here.
    • Making the Darwin socket path raise on write-to-closed is a product/behavioral change well outside small-fix bounds.

    Whether MacCatalyst should simply inherit the existing OSX skip (all Darwin) is a maintainer judgement, so I am handing off rather than editing the skip.

    Evidence

    Suggested reviewers / area contacts

    Note

    🔒 Integrity filter blocked 17 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".
    • #104998 search_pull_requests: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
    • #104750 search_pull_requests: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
    • #97491 search_pull_requests: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
    • #76276 search_pull_requests: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
    • #78999 search_pull_requests: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
    • #76417 search_pull_requests: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
    • #69571 search_pull_requests: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
    • #62435 search_pull_requests: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
    • #61444 search_pull_requests: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
    • #35376 search_pull_requests: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
    • #193 search_pull_requests: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
    • #34218 search_pull_requests: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
    • #38914 search_pull_requests: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
    • #44747 search_pull_requests: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
    • [ci-scan] Test failure: System.Threading.Tests.MutexTests.CrossProcess_NamedMutex_ConcurrentCreateOrOpen #130125 issue_read: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
    • ... and 1 more item

    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 · ● 9.3M · ◷

  7. jeffschwMSFT
    removed
    blocking-clean-ciBlocking PR or rolling runs of 'runtime' or 'runtime-extra-platforms'
    on Aug 10, 2026

  8. jeffschwMSFT commented on Aug 10, 2026

    @jeffschwMSFT
    jeffschwMSFT
    on Aug 10, 2026
    Member

    removing blocking-clean-ci as it has not failed in 30 days

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

  9. kotlarmilos
    closed this as completedon Aug 14, 2026
  10. github-actions
    locked and limited conversation to collaborators on Sep 15, 2026
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