[QUIC] IsSupportedIsTrue failing on Armv6 and s390x

[ManickaP]

SupportedLinuxPlatforms_IsSupportedIsTrue

It is also failing on helix for linux-armv6:

https://helixre8s23ayyeko0k025g8.blob.core.windows.net/dotnet-runtime-refs-heads-main-21c096763250462988/System.Net.Quic.Functional.Tests/3/console.f2cd77de.log?helixlogtype=result

and linux-s390x:

https://helixre107v0xdeko0k025g8.blob.core.windows.net/dotnet-runtime-refs-heads-main-053a9df11f6d452495/System.Net.Quic.Functional.Tests/3/console.2de1fd1f.log?helixlogtype=result

Originally posted by @am11 in #82108 (comment)

(ubuntu.1804.armarch.open) using docker image mcr.microsoft.com/dotnet-buildtools/prereqs:raspbian-10-helix-arm32v6

    System.Net.Quic.Tests.MsQuicPlatformDetectionTests.SupportedWindowsPlatforms_IsSupportedIsTrue [SKIP]
      Condition(s) not met: "IsWindows"
    System.Net.Quic.Tests.MsQuicPlatformDetectionTests.SupportedLinuxPlatforms_IsSupportedIsTrue [FAIL]
      Assert.True() Failure
      Expected: True
      Actual:   False
      Stack Trace:
        /_/src/libraries/System.Net.Quic/tests/FunctionalTests/MsQuicPlatformDetectionTests.cs(63,0): at System.Net.Quic.Tests.MsQuicPlatformDetectionTests.SupportedLinuxPlatforms_IsSupportedIsTrue()
        /_/src/mono/System.Private.CoreLib/src/System/Reflection/MethodInvoker.Mono.cs(30,0): at System.Reflection.MethodInvoker.InterpretedInvoke(Object obj, IntPtr* args)
        /_/src/libraries/System.Private.CoreLib/src/System/Reflection/MethodInvoker.cs(59,0): at System.Reflection.MethodInvoker.Invoke(Object obj, IntPtr* args, BindingFlags invokeAttr)
      Output:
        Using unknown
        Running on Distro=raspbian VersionId=10.0

(ubuntu.2004.s390x.experimental.open) executed on machine ms02 running Linux-5.4.0-137-generic-s390x-with-glibc2.29
    System.Net.Quic.Tests.MsQuicPlatformDetectionTests.SupportedLinuxPlatforms_IsSupportedIsTrue [FAIL]
      Assert.True() Failure
      Expected: True
      Actual:   False
      Stack Trace:
        /_/src/libraries/System.Net.Quic/tests/FunctionalTests/MsQuicPlatformDetectionTests.cs(63,0): at System.Net.Quic.Tests.MsQuicPlatformDetectionTests.SupportedLinuxPlatforms_IsSupportedIsTrue()
        /_/src/mono/System.Private.CoreLib/src/System/Reflection/MethodInvoker.Mono.cs(30,0): at System.Reflection.MethodInvoker.InterpretedInvoke(Object obj, IntPtr* args)
        /_/src/libraries/System.Private.CoreLib/src/System/Reflection/MethodInvoker.cs(59,0): at System.Reflection.MethodInvoker.Invoke(Object obj, IntPtr* args, BindingFlags invokeAttr)
      Output:
        Using unknown
        Running on Distro=ubuntu VersionId=20.4

EDIT:
I did a search in DevOps tests:

AzureDevOpsTests
| where TestName == "System.Net.Quic.Tests.MsQuicPlatformDetectionTests.SupportedLinuxPlatforms_IsSupportedIsTrue"
  and Outcome != "Pass"
| project-keep QueueName, TestRunName, BuildDefinitionName, RunCompleted, BuildReason, Branch
| order by BuildDefinitionName, QueueName, TestRunName, RunCompleted

And seems like these 2 platforms:

• net8.0-linux-Release-s390x-Mono_Release-Ubuntu.2004.S390X.Experimental.Open
• net8.0-linux-Release-armv6-Mono_Release-(Raspbian.10.Armv6.Open)Ubuntu.1804.ArmArch.Open@mcr.microsoft.com/dotnet-buildtools/prereqs:raspbian-10-helix-arm32v6

Are the only remaining failing ones, as of now.

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  "ErrorMessage": "",
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Issue Details

---

It is also failing on helix for linux-armv6:

https://helixre8s23ayyeko0k025g8.blob.core.windows.net/dotnet-runtime-refs-heads-main-21c096763250462988/System.Net.Quic.Functional.Tests/3/console.f2cd77de.log?helixlogtype=result

and linux-s390x:

https://helixre107v0xdeko0k025g8.blob.core.windows.net/dotnet-runtime-refs-heads-main-053a9df11f6d452495/System.Net.Quic.Functional.Tests/3/console.2de1fd1f.log?helixlogtype=result

Originally posted by @am11 in #82108 (comment)

Author:	ManickaP
Assignees:	-
Labels:	untriaged, area-System.Net.Quic
Milestone:	-

[ManickaP]

Once #82159 is merged, this should become disabled-test issue.

[ManickaP]

This is another occurrence of #55979, i.e. msquic is silently dropping connections due to the machine being too slow.

I've temporarily added statistics (6709e8e) and they show multiple dropped connections.

I'm moving this to future as we don't have any solution for this problem. Maybe we could even close this against #55979

[wfurt]

That is pretty sad that we cannot make single test reliable. I'm wondering if we can use the counter to adjust the expectation or decrease the concurrency for ARM. (or tune the drop threshold)

cc: @nibanks

[nibanks]

That is pretty sad that we cannot make single test reliable.

You can't run a single test without failing? From my previous understanding, QUIC was getting overwhelmed by too much getting queued, and it was (by design) aborting the connection because it could no longer provide the time guarantees to have a reliable connection. But this wasn't caused by just 1 test.

[wfurt]

In this particular test, there is single listener and many parallel attempts to negotiate connection - this test was added recently to verify handling accept queue inside .NET.

[wfurt]

Failed for me on x64 as well while running tests on my VM over the weekend

    System.Net.Quic.Tests.MsQuicPlatformDetectionTests.UnsupportedPlatforms_ThrowsPlatformNotSupportedException [SKIP]
      Condition(s) not met: "IsQuicUnsupported"
      Assert.Equal() Failure
      Expected: 100
      Actual:   94
      Stack Trace:
        /home/furt/github/wfurt-runtime/src/libraries/System.Net.Quic/tests/FunctionalTests/QuicListenerTests.cs(251,0): at System.Net.Quic.Tests.QuicListenerTests.Listener_BacklogLimitRefusesConnection_ParallelClients_ClientThrows_Core(Int32 backlogLimit, Int32 connectCount)
        /home/furt/github/wfurt-runtime/src/libraries/System.Net.Quic/tests/FunctionalTests/QuicListenerTests.cs(268,0): at System.Net.Quic.Tests.QuicListenerTests.Listener_BacklogLimitRefusesConnection_ParallelClients_ClientThrows_Core(Int32 backlogLimit, Int32 connectCount)

[ManickaP]

For some reason I have mismatched the issues, the comments belong to #82769 🤦

[wfurt]

I'm wondering if the milestone is right @ManickaP. Are we going to support armv6 or s390x architectures?
While #82769 happened on supported HW I think this is one is not.