SOS.Tests VerifyHeap_ReportsNoCorruption rejects output without “0 errors” #5996

Build Information

Build: https://dev.azure.com/dnceng-public/public/_build/results?buildId=1578741
Leg Name: Windows_Test_x64_Debug
Build error leg or test failing: SOS.Tests.GcInspectionTests.VerifyHeap_ReportsNoCorruption

Error Message

{
  "ErrorPattern": [
    "Assert\\.Matches\\(\\) Failure: Pattern not found in value",
    "Regex: .+0 errors.+",
    "Value: .+Segment +Object +Failure"
  ],
  "BuildRetry": false,
  "ExcludeConsoleLog": false
}

VerifyHeap_ReportsNoCorruption requires the exact phrase 0 errors. In two Windows x64 Debug matrix cases, verifyheap returned its segment/object/failure table without that phrase, causing the assertion to fail.

Investigate whether this is a valid host/runtime/DAC output variation or an SOS regression. If valid, the test should assert semantically that no corruption records were reported while retaining No heap corruption detected. Until resolved, skip only the confirmed configurations and link the skip to this issue.

Known issue validation

Build: 🔎 https://dev.azure.com/dnceng-public/public/_build/results?buildId=1578741
Error message validated: [Assert\.Matches\(\) Failure: Pattern not found in value Regex: .+0 errors.+ Value: .+Segment +Object +Failure]
Result validation: ❌ Known issue did not match with the provided build.
Validation performed at: 9/2/2026 9:57:00 PM UTC

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Summary