[ci-scan] Test failure: SslStreamTlsResumeTests.ClientCert_DefaultValue_ResumeSucceeds on Linux ARM64 Mono

[agocke]

Build Information

Build: https://dev.azure.com/dnceng-public/public/_build/results?buildId=1621764
Build error leg or test failing: net11.0-linux-Debug-arm64-Mono_Minijit_Debug-(AzureLinux.3.0.ArmArch.Open) - System.Net.Security.Tests.SslStreamTlsResumeTests.ClientCert_DefaultValue_ResumeSucceeds
Pull request: #135130

Failure Scope

PR-unrelated flaky CI failure on Linux ARM64, Azure Linux 3.0, Debug Mono Minijit. The source PR changes only eng/pipelines/coreclr/templates/setup-roslyn-cache.yml and eng/pipelines/runtime.yml to seed rolling Debug Roslyn compiler caches; it does not change the affected networking or test code.

The theory case sslProtocol: None, certificateRequired: True, certSource: ClientCertificate expects the TLS connection to resume, but observes False in RunConnectionAsync. The cause has not been established; no deterministic local reproduction is claimed.

Related: #134825 records the same test and assertion on Windows x64 CoreCLR for sslProtocol: Tls13, certificateRequired: True, certSource: CertificateContext. Its matcher hard-codes that different theory case, so it does not cover this Linux/Mono occurrence. A shared root cause has not been established.

Test result: https://dev.azure.com/dnceng-public/public/_build/results?buildId=1621764&view=ms.vss-test-web.build-test-results-tab&runId=44931858&resultId=196793

Console log: https://helixr18s23ayyeko0k025g8.blob.core.windows.net/dotnet-runtime-refs-pull-135130-merge-5b7a0a2359644e1593/System.Net.Security.Tests/1/console.97e829fc.log?helixlogtype=result

Helix job: 5b7a0a23-5964-4e15-9385-4da3b27e9b48
Helix work item: System.Net.Security.Tests

KBE authoring guidance (ci-failure-scan)

• Error Details is for readers; Build Analysis parses only the single JSON block under Error Message.
• Each ErrorMessage element is a case-sensitive literal substring from one log line, matched in order.
• The matcher includes the exact failing theory arguments and the expected/actual values, without volatile source line numbers.
• BuildRetry is false; this is not an infrastructure retry request. ExcludeConsoleLog is false.

Error Details

System.Net.Security.Tests.SslStreamTlsResumeTests.ClientCert_DefaultValue_ResumeSucceeds(sslProtocol: None, certificateRequired: True, certSource: ClientCertificate) [FAIL]
  Assert.Equal() Failure: Values differ
  Expected: True
  Actual:   False
  Stack Trace:
    /_/src/libraries/System.Net.Security/tests/FunctionalTests/SslStreamAllowTlsResumeTests.cs(263,0): at System.Net.Security.Tests.SslStreamTlsResumeTests.RunConnectionAsync(SslServerAuthenticationOptions serverOptions, SslClientAuthenticationOptions clientOptions, Nullable`1 expectResume)
    /_/src/libraries/System.Net.Security/tests/FunctionalTests/SslStreamAllowTlsResumeTests.cs(247,0): at System.Net.Security.Tests.SslStreamTlsResumeTests.ResumeSucceedsInternal(SslServerAuthenticationOptions serverOptions, SslClientAuthenticationOptions clientOptions)
    --- End of stack trace from previous location ---

Error Message

{
  "ErrorMessage": [
    "System.Net.Security.Tests.SslStreamTlsResumeTests.ClientCert_DefaultValue_ResumeSucceeds(sslProtocol: None, certificateRequired: True, certSource: ClientCertificate) [FAIL]",
    "Assert.Equal() Failure: Values differ",
    "Expected: True",
    "Actual:   False"
  ],
  "ErrorPattern": "",
  "BuildRetry": false,
  "ExcludeConsoleLog": false
}

Agentic workflow metadata (ci-failure-scan)

Workflow artifact: ci-failure-scan
Artifact kind: kbe-verification
Verified match count: 1 hits in failure.log

Note

This issue was generated with GitHub Copilot.

Known issue validation

Build: 🔎 https://dev.azure.com/dnceng-public/public/_build/results?buildId=1621764
Error message validated: [System.Net.Security.Tests.SslStreamTlsResumeTests.ClientCert_DefaultValue_ResumeSucceeds(sslProtocol: None, certificateRequired: True, certSource: ClientCertificate) [FAIL] Assert.Equal() Failure: Values differ Expected: True Actual: False]
Result validation: ✅ Known issue matched with the provided build.
Validation performed at: 10/3/2026 1:22:36 AM UTC

Report

Build	Repository	Test	Pull Request
1621764	dotnet/runtime	System.Net.Security.Tests.SslStreamTlsResumeTests.ClientCert_DefaultValue_ResumeSucceeds	#135130

Summary

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

[dotnet-policy-service]

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