[Flaky Test] Quarantine 5 flaky tests (Windows-only)

[github-actions]

Quarantines 5 flaky tests detected by the automated flaky-test detector across main rolling builds and approved PRs. All failures are confined to Windows legs (FullOnWindows, FullOnWindows Release, CoreOnWindows) with net472 TFM, so each is scoped with TestPlatforms.Windows.

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1. CoordinatorServer_Tests.ConcurrentClients_AllReceiveGrants

Flaky-test key (automated de-duplication — do not edit):

flaky-test-id: Microsoft.Build.Coordinator.UnitTests.CoordinatorServer_Tests.ConcurrentClients_AllReceiveGrants

Action: Quarantine (6a)
Tracked by #14193

• Distinct sources: 7 (3 PRs + 4 rolling main builds)
• PRs: Add EnumeratePattern and OpenedFileOrDirectoryAttributes to FileAccessData #14104, (nit) Update README 2026 #14130, Fix DrainPacketQueue threads leaking #14135
• Rolling builds: 1472231, 1472331, 1477803, 1478840
• Legs: CoreOnWindows, FullOnWindows, FullOnWindows Release | TFM: net472
• First seen: 2026-06-19 | Last seen: 2026-06-24
• Sample error: System.IO.IOException: The semaphore timeout period has expired.

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2. MSBuildServer_Tests.CanShutdownServerProcess

Flaky-test key (automated de-duplication — do not edit):

flaky-test-id: Microsoft.Build.Engine.UnitTests.MSBuildServer_Tests.CanShutdownServerProcess

Action: Quarantine (6a)
Tracked by #14195

• Distinct sources: 3 (rolling main builds only)
• Rolling builds: 1464065, 1475010, 1481906
• Legs: FullOnWindows, FullOnWindows Release | TFM: net472
• First seen: 2026-06-15 | Last seen: 2026-06-25
• Error hashes: 4 distinct signatures
• Sample error: System.InvalidOperationException: Couldn't get process information from performance counter.

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3. XMakeAppTests.GetCommandLine

Flaky-test key (automated de-duplication — do not edit):

flaky-test-id: Microsoft.Build.UnitTests.XMakeAppTests.GetCommandLine

Action: Quarantine (6a)
Tracked by #14194

• Distinct sources: 3 (rolling main builds only)
• Rolling builds: 1464065, 1475010, 1481906
• Legs: FullOnWindows, FullOnWindows Release | TFM: net472
• First seen: 2026-06-15 | Last seen: 2026-06-25
• Error hashes: 4 distinct signatures
• Sample error: command-line path assertion mismatch on Windows (ShouldContain failure for MSBuild.exe /v:diag path)

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4. XMakeAppTests.GetCommandLineQuotedExe

Flaky-test key (automated de-duplication — do not edit):

flaky-test-id: Microsoft.Build.UnitTests.XMakeAppTests.GetCommandLineQuotedExe

Action: Quarantine (6a)
Tracked by #14192

• Distinct sources: 3 (rolling main builds only)
• Rolling builds: 1464065, 1475010, 1481906
• Legs: FullOnWindows, FullOnWindows Release | TFM: net472
• First seen: 2026-06-15 | Last seen: 2026-06-25
• Error hashes: 4 distinct signatures
• Sample error: command-line path assertion mismatch on Windows (ShouldContain failure for MSBuild.exe /v:diag path)

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5. XMakeAppTests.GetCommandLineQuotedExeOnPath

Flaky-test key (automated de-duplication — do not edit):

flaky-test-id: Microsoft.Build.UnitTests.XMakeAppTests.GetCommandLineQuotedExeOnPath

Action: Quarantine (6a)
Tracked by #14196

• Distinct sources: 3 (rolling main builds only)
• Rolling builds: 1464065, 1475010, 1481906
• Legs: FullOnWindows, FullOnWindows Release | TFM: net472
• First seen: 2026-06-15 | Last seen: 2026-06-25
• Error hashes: 4 distinct signatures
• Sample error: command-line path assertion mismatch on Windows (ShouldContain failure for MSBuild.exe /v:diag path)

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