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[ci-scan] Test failure: SOS.UnitTests cannot find .NET 10 runtime #134603
Description
Build Information
Build: https://dev.azure.com/dnceng-public/cbb18261-c48f-4abb-8651-8cdcb5474649/_build/results?buildId=1609461
Build error leg or test failing: DAC_windows_x64_release-SOS.UnitTests; cDAC_windows_x64_release-SOS.UnitTests
Pull request: #133986
Error Details
Both Windows x64 SOS test legs fail before test discovery. The generated SOS.UnitTests.exe apphost requires .NET 10, but the test runtime directory contains only .NET 11:
You must install or update .NET to run this application.
App: D:\\a\\_work\\1\\s\\artifacts\\bin\\SOS.UnitTests\\Release\\net10.0\\SOS.UnitTests.exe
Architecture: x64
Framework: 'Microsoft.NETCore.App', version '10.0.0' (x64)
.NET location: D:\\a\\_work\\1\\s\\artifacts\\dotnet-test\\
The following frameworks were found:
11.0.0-rc.2.26465.113 at [D:\\a\\_work\\1\\s\\artifacts\\dotnet-test\\shared\\Microsoft.NETCore.App]
The same runtime-host failure affected the diagnostics unit-test suite broadly; SOS did not reach test discovery or execute any assertions. A matching failure also occurred on the main branch in build 1610128, confirming this is a shared diagnostics runtime-provisioning or test-host selection issue rather than an SOS product failure.
Error Message
{
"ErrorMessage": "Framework: 'Microsoft.NETCore.App', version '10.0.0' (x64)\n.NET location: ",
"ErrorPattern": "",
"BuildRetry": false,
"ExcludeConsoleLog": false
}Agentic workflow metadata (ci-failure-scan)
Workflow artifact: ci-failure-scan
Artifact kind: kbe-verification
Verified match count: 2 SOS test-log hits in build 1609461; reproduced on main in build 1610128
Note
This issue body was prepared with GitHub Copilot.
Known issue validation
Build: 🔎 https://dev.azure.com/dnceng-public/public/_build/results?buildId=1609461
Error message validated: [Framework: 'Microsoft.NETCore.App', version '10.0.0' (x64) .NET location: ]
Result validation: ❌ Known issue did not match with the provided build.
Validation performed at: 9/24/2026 5:37:26 PM UTC
Report
Summary
| 24-Hour Hit Count | 7-Day Hit Count | 1-Month Count |
|---|---|---|
| 0 | 0 | 0 |
Activity
jkoritzinsky commentedon Sep 24, 2026
Additional corroborating occurrence on
main:20260923.11runtime-diagnosticsrefs/heads/mainat8aae212bb529c47b32ffca2ab3f5c87907f6861eThis confirms the runtime-host failure is not specific to PR #133986. The same Windows diagnostics/SOS provisioning issue occurs on the main branch, so the KBE should remain classified as a shared infrastructure/test-host problem.
Note
This comment was prepared with GitHub Copilot.
dotnet-policy-service commentedon Sep 24, 2026
Tagging subscribers to this area: @dotnet/runtime-infrastructure
See info in area-owners.md if you want to be subscribed.
dotnet-policy-service commentedon Sep 29, 2026
Tagging subscribers to this area: @steveisok, @tommcdon, @dotnet/dotnet-diag
See info in area-owners.md if you want to be subscribed.
jeffschwMSFT commentedon Oct 19, 2026
removing blocking-clean-ci as it has not failed in 30 days