SOS.Tests local CI execution is unsupported or exceeds leg timeout #5997

Build Information

Build: https://dev.azure.com/dnceng-public/public/_build/results?buildId=1578741
Leg Name: Ubuntu_22_04_x64_Debug, Ubuntu_22_04_x64_Release, MacOS_Test_x64_Debug, MacOS_Test_x64_Release, Windows_Test_x86_Release, Alpine3_23_x64_Debug, Alpine3_23_x64_Release

Error Message

{
  "ErrorPattern": "(?:The job running on agent .+ ran longer than the maximum time of 180 minutes|XUnit.*Tests failed: .*[\\\\/]SOS\\.Tests_net10\\.0_x86\\.html|XUnit.*Tests failed: .*[\\\\/]artifacts[\\\\/]log[\\\\/](?:Debug|Release)[\\\\/]SOS\\.Tests_net10\\.0_x64\\.log)",
  "BuildRetry": false,
  "ExcludeConsoleLog": false
}

The new SOS.Tests harness runs a large host/runtime/flavor/dump/DAC matrix. Running the complete matrix in the existing local test legs causes three related temporary CI failures:

• Ubuntu and macOS test legs exceed the 180-minute job limit.
• Windows x86 loads the x64 hostfxr.dll (0x800700C1), followed by cascading EngineHost timeouts and test failures.
• Alpine attempts to execute the transferred glibc-targeted SOS.Tests apphost and reports SOS.Tests: not found on musl.

#5981 moves SOS.Tests to capture-family-sharded Helix work items, uses a shared platform payload, invokes dotnet SOS.Tests.dll on musl, and gates unsupported configurations. Until that integration lands, affected local SOS.Tests executions should be skipped without skipping the repository's existing non-SOS tests.

Known issue validation

Build: 🔎 https://dev.azure.com/dnceng-public/public/_build/results?buildId=1578741
Error message validated: [(?:The job running on agent .+ ran longer than the maximum time of 180 minutes|XUnit.*Tests failed: .*[\\/]SOS\.Tests_net10\.0_x86\.html|XUnit.*Tests failed: .*[\\/]artifacts[\\/]log[\\/](?:Debug|Release)[\\/]SOS\.Tests_net10\.0_x64\.log)]
Result validation: ✅ Known issue matched with the provided build.
Validation performed at: 9/2/2026 9:56:44 PM UTC

Report

Summary