[ci-scan] Test failure: DnsGetHostAddresses_LocalhostSubdomain_RespectsAddressFamily on Android

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Build Information

Build: https://dev.azure.com/dnceng-public/public/_build/results?buildId=1425947
Build error leg or test failing: android-arm64 Release AllSubsets_CoreCLR - System.Net.NameResolution.Functional.Tests

Error Details

DnsGetHostAddresses_LocalhostSubdomain_RespectsAddressFamily and DnsGetHostEntry_LocalhostSubdomain_RespectsAddressFamily fail on Android with Assert.All() Failure — the resolver returns IPv6 addresses when AddressFamily.InterNetwork was requested.

This is a recurrence distinct from the prior KBE #124751 (closed 2026-05-05, which reported SocketException: hostname nor servname provided). The current failure is an address-family mismatch rather than a resolution failure.

[FAIL] System.Net.NameResolution.Tests.GetHostAddressesTest.DnsGetHostAddresses_LocalhostSubdomain_RespectsAddressFamily(addressFamily: InterNetwork)
Assert.All() Failure: 7 out of 9 items in the collection did not pass.
[1]: Item:  fe80::dc30:2cff:feca:33f4%47
     Error: Assert.Equal() Failure: Values differ
            Expected: InterNetwork
            Actual:   InterNetworkV6

Tracking: #124751

Affected legs:

• runtime-extra-platforms (def 154): android-arm64 Release AllSubsets_CoreCLR @ windows.11.amd64.android.open

First build it occurred: 1424079 (2026-05-18). 2+ occurrences in scanned window.

Error Message

{
  "ErrorMessage": ["DnsGetHostAddresses_LocalhostSubdomain_RespectsAddressFamily", "Assert.All() Failure"],
  "ErrorPattern": "",
  "BuildRetry": false,
  "ExcludeConsoleLog": false
}

Note

🔒 Integrity filter blocked 1 item

The following item was blocked because it doesn't meet the GitHub integrity level.

• #125825 search_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".

To allow these resources, lower min-integrity in your GitHub frontmatter:

tools:
  github:
    min-integrity: approved  # merged | approved | unapproved | none

Generated by CI Outer-Loop Failure Scanner · ● 37.8M · ◷

Report

Build	Definition	Test	Pull Request
1426342	dotnet/runtime	System.Net.NameResolution.Functional.Tests.WorkItemExecution	#125437
1426173	dotnet/runtime	System.Net.NameResolution.Functional.Tests.WorkItemExecution	#128284

Summary

24-Hour Hit Count	7-Day Hit Count	1-Month Count
2	2	2

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