System.Net.Sockets.Tests.DualModeConnectionlessReceiveFromEap.ReceiveFromV4BoundToAnyV6_Success: System.TimeoutException

## Build Information
Build: https://dev.azure.com/dnceng-public/cbb18261-c48f-4abb-8651-8cdcb5474649/_build/results?buildId=1544854
Build error leg or test failing: System.Net.Sockets.Tests.DualModeConnectionlessReceiveFromEap.ReceiveFromV4BoundToAnyV6_Success
Pull request: https://github.com/dotnet/runtime/pull/131671

```
System.Net.Sockets.Tests.DualModeConnectionlessReceiveFromEap.ReceiveFromV4BoundToAnyV6_Success [FAIL]
System.TimeoutException : The operation has timed out.
Stack Trace:
/_/src/libraries/Common/tests/System/Threading/Tasks/TaskTimeoutExtensions.cs(48,0): at System.Threading.Tasks.TaskTimeoutExtensions.d__7`1[[System.Net.Sockets.SocketReceiveFromResult, System.Net.Sockets, Version=11.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a]].MoveNext()
/_/src/libraries/System.Net.Sockets/tests/FunctionalTests/DualModeSocketTest.cs(1045,0): at System.Net.Sockets.Tests.DualModeConnectionlessReceiveFromBase`1.d__11[[System.Net.Sockets.Tests.SocketHelperEap, System.Net.Sockets.Tests, Version=11.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51]].MoveNext()
--- End of stack trace from previous location ---
```

## Error Message

Fill the error message using [step by step known issues guidance](https://github.com/dotnet/arcade/blob/main/Documentation/Build%20Analysis/KnownIssueJsonStepByStep.md).

```json
{
"ErrorMessage": ["ReceiveFromV4BoundToAnyV6_Success [FAIL]", "System.TimeoutException" ],
"BuildRetry": false,
"ExcludeConsoleLog": false
}
```

### Known issue validation
**Build: :mag_right:** https://dev.azure.com/dnceng-public/public/_build/results?buildId=1544854
**Error message validated:** `[ReceiveFromV4BoundToAnyV6_Success [FAIL] System.TimeoutException`]
**Result validation:** :white_check_mark: Known issue matched with the provided build.
**Validation performed at:** 8/10/2026 5:36:07 PM UTC

### Report

|Build|Repository|Test|Pull Request|
|---|---|---|---|
|[1588064](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1588064)|dotnet/runtime|[System.Net.Sockets.Tests.DualModeConnectionlessReceiveFromApm.ReceiveFromV4BoundToAnyV6_Success](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1588064&view=ms.vss-test-web.build-test-results-tab&runId=43829132&resultId=234145)|dotnet/runtime#131869|
|[1578026](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1578026)|dotnet/runtime|[System.Net.Sockets.Tests.DualModeConnectionlessReceiveFromTask.ReceiveFromV4BoundToAnyV6_Success](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1578026&view=ms.vss-test-web.build-test-results-tab&runId=43514708&resultId=226735)|dotnet/runtime#133063|
|[1577994](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1577994)|dotnet/runtime|[System.Net.Sockets.Tests.DualModeConnectionlessReceiveFromTask.ReceiveFromV4BoundToAnyV6_Success](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1577994&view=ms.vss-test-web.build-test-results-tab&runId=43512616&resultId=234373)|dotnet/runtime#132420|
|[1576333](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1576333)|dotnet/runtime|[System.Net.Sockets.Tests.DualModeConnectionlessReceiveFromTask.ReceiveFromV4BoundToAnyV6_Success](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1576333&view=ms.vss-test-web.build-test-results-tab&runId=43454484&resultId=226876)|dotnet/runtime#131792|
|[1567862](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1567862)|dotnet/runtime|[System.Net.Sockets.Tests.DualModeConnectionlessReceiveFromTask.ReceiveFromV4BoundToAnyV6_Success](https://dev.azure.com/dnceng-public/public/_build/results?buildId=1567862&view=ms.vss-test-web.build-test-results-tab&runId=43263022&resultId=101367)|dotnet/runtime#132737|
#### Summary
|24-Hour Hit Count|7-Day Hit Count|1-Month Count|
|---|---|---|
|0|1|5|

Start with the failing ReceiveFromV4BoundToAnyV6_Success test and the helper at src/libraries/System.Net.Sockets/tests/FunctionalTests/DualModeSocketTest.cs:1045. Review the timeout implementation at src/libraries/Common/tests/System/Threading/Tasks/TaskTimeoutExtensions.cs:48 and the linked build reports and pull requests. Done means the test no longer times out and the known-issue report is no longer reproduced.

Written by the indexing model from the issue text.