[ci-scan] Hang: System.Net.WebSockets.Client.Tests times out on Apple (tvos/iossimulator) after 4500s #131317

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1. github-actions

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   blocking-clean-ciBlocking PR or rolling runs of 'runtime' or 'runtime-extra-platforms'Blocking PR or rolling runs of 'runtime' or 'runtime-extra-platforms'

   Known Build ErrorUse this to report build issues in the .NET Helix tabUse this to report build issues in the .NET Helix tab

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3. kotlarmilos

   added this to the 12.0.0 milestone on Jul 28, 2026
4. kotlarmilos

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   os-tvosApple tvOSApple tvOS

   on Jul 28, 2026
5. dotnet-policy-service commented on Jul 28, 2026

   

   dotnet-policy-servicebot

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

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8. dotnet-policy-service commented on Jul 29, 2026

   

   dotnet-policy-servicebot

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   Tagging subscribers to this area: @karelz, @dotnet/ncl
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9. github-actions commented on Jul 30, 2026

   

   github-actionsbot

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   Workflow artifact: ci-fix
   Artifact kind: handoff
   Linked KBE: #131317

   Note

   AI/Copilot-generated triage note.

   This Known Build Error has no producible automated code change (reason: platform-specific hang/timeout — a whole System.Net.WebSockets.Client.Tests run times out after 4500s on Apple legs, which is a networking/runtime hang diagnosis rather than a mechanical edit), 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)

   On tvos-arm64 Release AllSubsets_NativeAOT and iossimulator-x64 Release AllSubsets_CoreCLR, the System.Net.WebSockets.Client.Tests assembly hits Run timed out after 4500 seconds. Two tests are implicated before the timeout: SendReceiveTest_Invoker_Http2Loopback.ReceiveAsync_MultipleOutstandingReceiveOperations_Throws and AbortTest_SharedHandler_Loopback.ServerPrematureEos_ClientGetsCorrectException. The whole-assembly timeout (not a single [FAIL]) indicates a hang — an outstanding receive/abort operation that never completes on the Apple HTTP/2 loopback path, blocking the run. Diagnosing whether this is an HTTP/2 loopback deadlock, an Apple-specific socket/TLS stall, or a NativeAOT-specific async continuation issue requires networking expertise and live repro; no safe mechanical diff is producible, and disabling is off the table.

   Evidence

   • Failing build: https://dev.azure.com/dnceng-public/public/_build/results?buildId=1522836
   • Possible related PR: none identified with sufficient confidence

   Suggested reviewers / area contacts

   • Area owners (area-System.Net): @karelz, @dotnet/ncl

   A fix would likely involve identifying the outstanding WebSocket receive/abort operation that hangs on the Apple HTTP/2 loopback path and ensuring it completes (or faults) so the run does not stall.

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   Generated by CI Outer-Loop Failure Fixer · 287.5 AIC · ⌖ 18.4 AIC · ⊞ 17.4K · ◷
10. jeffschwMSFT

    removed

    blocking-clean-ciBlocking PR or rolling runs of 'runtime' or 'runtime-extra-platforms'Blocking PR or rolling runs of 'runtime' or 'runtime-extra-platforms'

    on Sep 21, 2026
11. jeffschwMSFT commented on Sep 21, 2026

    

    jeffschwMSFT

    on Sep 21, 2026

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

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