SocketsHttpHandler_DiagnosticsTest_Http3.SendAsync_DiagnosticListener_ExpectedTagsRecorded: traceparent was not injected (HTTP/3 loopback cross-talk?)

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难度
4/5
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3-5 天
新手友好度
35/100
Issue 类型
缺陷
描述清晰度
基本清楚
活跃度
活跃
技术栈
csharp
领域
networking, testing

调研方向

Start with the failing tests in src/libraries/System.Net.Http/tests/FunctionalTests/DiagnosticsTests.cs and the adjacent HTTP/3 loopback tests, especially StatusCodes_ReceiveSuccess. Reproduce the failure and investigate whether concurrent loopback servers can exchange requests; the cross-talk explanation is still a hypothesis. Done when the cause is confirmed and the relevant tests pass reliably.

由索引模型根据 Issue 内容生成。

描述

area-System.Net.Http Known Build Error untriaged

Build Information

Build: https://dev.azure.com/dnceng-public/public/_build/results?buildId=1673975
Leg Name: net10.0-linux-Debug-x64-coreclr_release-(AzureLinux.3.0.Amd64.Open) (System.Net.Http.Functional.Tests)
Pull request: https://github.com/dotnet/runtime/pull/137292 (YAML-only Android Helix queue change; unrelated)

Also seen on main: https://dev.azure.com/dnceng-public/public/_build/results?buildId=1658360 (azurelinux.4.amd64.open, statusCode: 404, 2026-11-01)

Error Details

System.Net.Http.Functional.Tests.SocketsHttpHandler_DiagnosticsTest_Http3.SendAsync_DiagnosticListener_ExpectedTagsRecorded(statusCode: 200, method: "GET") [FAIL]
  Microsoft.DotNet.RemoteExecutor.RemoteExecutionException : Remote process failed with an unhandled exception.
  Child exception:
    Xunit.Sdk.TrueException: traceparent was not injected when W3C instrumentation was enabled
  /_/src/libraries/System.Net.Http/tests/FunctionalTests/DiagnosticsTests.cs(1850,0): at System.Net.Http.Functional.Tests.DiagnosticsTest.AssertHeadersAreInjected(HttpRequestData request, Activity parent, Boolean passthrough, Boolean isW3C)
  /_/src/libraries/System.Net.Http/tests/FunctionalTests/DiagnosticsTests.cs(454,0): at System.Net.Http.Functional.Tests.DiagnosticsTest.<>c__DisplayClass12_0.<<SendAsync_DiagnosticListener_ExpectedTagsRecorded>b__6>d.MoveNext()
  /_/src/libraries/Common/tests/System/Threading/Tasks/TaskTimeoutExtensions.cs(90,0): at System.Threading.Tasks.TaskTimeoutExtensions.WhenAllOrAnyFailed(Task[] tasks)
  /_/src/libraries/Common/tests/System/Net/Http/GenericLoopbackServer.cs(44,0): at System.Net.Test.Common.LoopbackServerFactory.<>c__DisplayClass6_0.<<CreateClientAndServerAsync>b__0>d.MoveNext()
  /_/src/libraries/Common/tests/System/Net/Http/Http3LoopbackServer.cs(115,0): at System.Net.Test.Common.Http3LoopbackServerFactory.CreateServerAsync(Func`3 funcAsync, Int32 millisecondsTimeout, GenericLoopbackOptions options)
  /_/src/libraries/System.Net.Http/tests/FunctionalTests/DiagnosticsTests.cs(438,0): at System.Net.Http.Functional.Tests.DiagnosticsTest.<>c.<<SendAsync_DiagnosticListener_ExpectedTagsRecorded>b__12_0>d.MoveNext()

In the same work item (console log), immediately before this failure:

System.Net.Http.Functional.Tests.HttpClientHandlerTest_Http3.StatusCodes_ReceiveSuccess(statusCode: Found, qpackEncode: True) [FAIL]
  Assert.Equal() Failure: Values differ
  Expected: Found
  Actual:   OK

This looks like cross-talk between two concurrently running HTTP/3 loopback servers. The StatusCodes_ReceiveSuccess client got the 200 OK that the diagnostics test's server sent. The diagnostics test's server, running in a RemoteExecutor child process, got a request without traceparent, which fits the StatusCodes_ReceiveSuccess client's request. This is a hypothesis and hasn't been confirmed.

Kusto (engsrvprod/engineeringdata, AzureDevOpsTests, last 90 days): traceparent was not injected appears only in the two builds above. Related but different: #136162 and #133842 (REQUEST_REJECTED retry race, fixed by #137064).

Error Message

{
  "ErrorMessage": [
    "SocketsHttpHandler_DiagnosticsTest_Http3.SendAsync_DiagnosticListener_ExpectedTagsRecorded",
    "Xunit.Sdk.TrueException: traceparent was not injected when W3C instrumentation was enabled"
  ],
  "BuildRetry": false,
  "ExcludeConsoleLog": false
}

[!NOTE]
This issue was drafted with AI assistance (GitHub Copilot).

Known issue validation

Build: 🔎 https://dev.azure.com/dnceng-public/public/_build/results?buildId=1673975
Error message validated: [SocketsHttpHandler_DiagnosticsTest_Http3.SendAsync_DiagnosticListener_ExpectedTagsRecorded Xunit.Sdk.TrueException: traceparent was not injected when W3C instrumentation was enabled]
Result validation: ✅ Known issue matched with the provided build.
Validation performed at: 11/11/2026 4:21:49 PM UTC

Report
Build Repository Test Pull Request
1673975 dotnet/runtime System.Net.Http.Functional.Tests.HttpClientHandlerTest_Http3.StatusCodes_ReceiveSuccess dotnet/runtime#137292
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