[android][arm64] System.Net.Sockets.Tests.SendTo_SyncForceNonBlocking.Datagram_UDP_ShouldImplicitlyBindLocalEndpoint fails with NetworkUnreachable

[kotlarmilos]

Build Information

Build: https://dev.azure.com/dnceng-public/public/_build/results?buildId=1167858&view=logs&j=11fc76eb-f2d5-5967-e9b4-f54329587f75&t=071fe9c1-8e24-5546-3854-e555c5768672
Build error leg or test failing: Datagram_UDP_ShouldImplicitlyBindLocalEndpoint

Error Message

Fill the error message using step by step known issues guidance.

{
  "ErrorMessage": "Network is unreachable",
  "BuildRetry": false,
  "ExcludeConsoleLog": false
}

The test fails only on Android arm/arm64, on Android x64 and other platforms it passes.

The detailed failure:

1)   [FAIL] System.Net.Sockets.Tests.SendTo_SyncForceNonBlocking.Datagram_UDP_ShouldImplicitlyBindLocalEndpoint   Test name: System.Net.Sockets.Tests.SendTo_SyncForceNonBlocking.Datagram_UDP_ShouldImplicitlyBindLocalEndpoint
Exception messages: System.Net.Sockets.SocketException : Network is unreachable   Exception stack traces:    at System.Net.Sockets.Socket.UpdateStatusAfterSocketErrorAndThrowException(SocketError error, Boolean disconnectOnFailure, String callerName)
at System.Net.Sockets.Socket.SendTo(Byte[] buffer, Int32 offset, Int32 size, SocketFlags socketFlags, EndPoint remoteEP)
at System.Net.Sockets.Tests.SocketHelperArraySync.<>c__DisplayClass11_0.<SendToAsync>b__0()
at System.Threading.Tasks.Task`1[[System.Int32, System.Private.CoreLib, Version=10.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].InnerInvoke()
at System.Threading.Tasks.Task.<>c.<.cctor>b__288_0(Object obj)
at System.Threading.ExecutionContext.RunFromThreadPoolDispatchLoop(Thread threadPoolThread, ExecutionContext executionContext, ContextCallback callback, Object state)
2)    [FAIL] System.Net.Sockets.Tests.SendTo_SyncForceNonBlocking.Datagram_UDP_AccessDenied_Throws_DoesNotBind   Test name: System.Net.Sockets.Tests.SendTo_SyncForceNonBlocking.Datagram_UDP_AccessDenied_Throws_DoesNotBind
Exception messages: Assert.Equal() Failure: Values differ
Expected: AccessDenied
Actual:   NetworkUnreachable   Exception stack traces:    at System.Net.Sockets.Tests.SendTo`1.<Datagram_UDP_AccessDenied_Throws_DoesNotBind>d__8[[System.Net.Sockets.Tests.SocketHelperSyncForceNonBlocking, System.Net.Sockets.Tests, Version=10.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51]].MoveNext()
3)    [FAIL] System.Net.Sockets.Tests.SendTo_Apm.Datagram_UDP_ShouldImplicitlyBindLocalEndpoint   Test name: System.Net.Sockets.Tests.SendTo_Apm.Datagram_UDP_ShouldImplicitlyBindLocalEndpoint
Exception messages: Assert.NotNull() Failure: Value is null   Exception stack traces:    at System.Net.Sockets.Tests.SendTo`1.<Datagram_UDP_ShouldImplicitlyBindLocalEndpoint>d__7[[System.Net.Sockets.Tests.SocketHelperApm, System.Net.Sockets.Tests, Version=10.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51]].MoveNext()
4)    [FAIL] System.Net.Sockets.Tests.SendTo_Apm.Datagram_UDP_AccessDenied_Throws_DoesNotBind   Test name: System.Net.Sockets.Tests.SendTo_Apm.Datagram_UDP_AccessDenied_Throws_DoesNotBind
Exception messages: Assert.Equal() Failure: Values differ
Expected: AccessDenied
Actual:   NetworkUnreachable   Exception stack traces:    at System.Net.Sockets.Tests.SendTo`1.<Datagram_UDP_AccessDenied_Throws_DoesNotBind>d__8[[System.Net.Sockets.Tests.SocketHelperApm, System.Net.Sockets.Tests, Version=10.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51]].MoveNext()
5)    [FAIL] System.Net.Sockets.Tests.SendTo_MemoryNativeTask.Datagram_UDP_ShouldImplicitlyBindLocalEndpoint   Test name: System.Net.Sockets.Tests.SendTo_MemoryNativeTask.Datagram_UDP_ShouldImplicitlyBindLocalEndpoint
Exception messages: Assert.NotNull() Failure: Value is null   Exception stack traces:    at System.Net.Sockets.Tests.SendTo`1.<Datagram_UDP_ShouldImplicitlyBindLocalEndpoint>d__7[[System.Net.Sockets.Tests.SocketHelperMemoryNativeTask, System.Net.Sockets.Tests, Version=10.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51]].MoveNext()

Known issue validation

Build: 🔎 https://dev.azure.com/dnceng-public/public/_build/results?buildId=1167858
Error message validated: [Network is unreachable]
Result validation: ✅ Known issue matched with the provided build.
Validation performed at: 10/8/2025 8:01:45 AM UTC

Report

Build	Definition	Step Name	Console log	Pull Request
1171538	dotnet/runtime	Build product	Log	#120636
1171298	dotnet/runtime	Build product	Log	#120629
1170786	dotnet/runtime	Build product	Log	#119432
1170448	dotnet/runtime	Build product	Log	#120583
1170356	dotnet/runtime	Build product	Log
1169287	dotnet/runtime	Build product	Log	#120298
1168588	dotnet/runtime	Build product	Log	#120542

Build	Definition	Test	Pull Request
1170667	dotnet/runtime	System.IO.Tests.WorkItemExecution
1168232	dotnet/runtime	System.Net.Sockets.Tests.WorkItemExecution
1167858	dotnet/runtime	System.Net.Sockets.Tests.WorkItemExecution

Summary

24-Hour Hit Count	7-Day Hit Count	1-Month Count
0	10	10

[dotnet-policy-service]

Tagging subscribers to 'arch-android': @vitek-karas, @simonrozsival, @steveisok, @akoeplinger
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Tagging subscribers to this area: @dotnet/ncl
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[MihuBot]

I'm a bot. Here is a possible related and/or duplicate issue (I may be wrong):

• [android] Connection issues in Sockets and Functional networking tests #104709

[vitek-karas]

Likely related to #119851 and #119852 they all seem to have similar behavior. It's possibly underlying platform issue, not specified to the failing tests.

[kotlarmilos]

It looks like the internet connection is blocked, or something similar. This reminds me of #114450.

[dotnet-policy-service]

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

[liveans]

Interestingly, the failure seems like the same as #114450, was there any update on Android arm infra lately? My suspicion is that: This is related to environment itself (similar to privacy setting thingy in #114450).