FileSystemWatcher_SymbolicLink_TargetsDirectory_Create_IncludeSubdirectories failed with missed event

[danmoseley]

Build Information

Build: https://dev.azure.com/dnceng-public/cbb18261-c48f-4abb-8651-8cdcb5474649/_build/results?buildId=1302001
Build error leg or test failing: System.IO.Tests.SymbolicLink_Changed_Tests.FileSystemWatcher_SymbolicLink_TargetsDirectory_Create_IncludeSubdirectories
Pull request: #124628

Error Message

Fill the error message using step by step known issues guidance.

{
  "ErrorMessage": "System.AggregateException : One or more errors occurred. (Expected Event occurred) (Expected Event occurred) (Expected Event occurred)",
  "ErrorPattern": "",
  "BuildRetry": false,
  "ExcludeConsoleLog": false
}

Known issue validation

Build: 🔎 https://dev.azure.com/dnceng-public/public/_build/results?buildId=1302001
Error message validated: [One or more errors occurred]
Result validation: ✅ Known issue matched with the provided build.
Validation performed at: 2/20/2026 8:56:47 PM UTC

Report

Build	Definition	Test	Pull Request
1302819	dotnet/runtime	System.IO.Tests.SymbolicLink_Changed_Tests.FileSystemWatcher_SymbolicLink_TargetsDirectory_Create_IncludeSubdirectories	#124660
1302001	dotnet/runtime	System.IO.Tests.SymbolicLink_Changed_Tests.FileSystemWatcher_SymbolicLink_TargetsDirectory_Create_IncludeSubdirectories	#124628

Summary

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

Known issue validation

Build: 🔎 https://dev.azure.com/dnceng-public/public/_build/results?buildId=1302001
Error message validated: [System.AggregateException : One or more errors occurred. (Expected Event occurred) (Expected Event occurred) (Expected Event occurred)]
Result validation: ✅ Known issue matched with the provided build.
Validation performed at: 2/20/2026 11:20:21 PM UTC

Report

Build	Definition	Test	Pull Request
1302819	dotnet/runtime	System.IO.Tests.SymbolicLink_Changed_Tests.FileSystemWatcher_SymbolicLink_TargetsDirectory_Create_IncludeSubdirectories	#124660
1302001	dotnet/runtime	System.IO.Tests.SymbolicLink_Changed_Tests.FileSystemWatcher_SymbolicLink_TargetsDirectory_Create_IncludeSubdirectories	#124628

Summary

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

Report

Build	Definition	Test	Pull Request
1304042	dotnet/runtime	System.IO.Tests.SymbolicLink_Changed_Tests.FileSystemWatcher_SymbolicLink_TargetsDirectory_Create_IncludeSubdirectories	#124660
1303735	dotnet/runtime	System.IO.Tests.SymbolicLink_Changed_Tests.FileSystemWatcher_SymbolicLink_TargetsDirectory_Create_IncludeSubdirectories
1303710	dotnet/runtime	System.IO.Tests.SymbolicLink_Changed_Tests.FileSystemWatcher_SymbolicLink_TargetsDirectory_Create_IncludeSubdirectories	#124626
1303482	dotnet/runtime	System.IO.Tests.SymbolicLink_Changed_Tests.FileSystemWatcher_SymbolicLink_TargetsDirectory_Create_IncludeSubdirectories	#124675
1303453	dotnet/runtime	System.IO.Tests.SymbolicLink_Changed_Tests.FileSystemWatcher_SymbolicLink_TargetsDirectory_Create_IncludeSubdirectories	#124669
1303334	dotnet/runtime	System.IO.Tests.SymbolicLink_Changed_Tests.FileSystemWatcher_SymbolicLink_TargetsDirectory_Create_IncludeSubdirectories	#124626
1302819	dotnet/runtime	System.IO.Tests.SymbolicLink_Changed_Tests.FileSystemWatcher_SymbolicLink_TargetsDirectory_Create_IncludeSubdirectories	#124660
1302001	dotnet/runtime	System.IO.Tests.SymbolicLink_Changed_Tests.FileSystemWatcher_SymbolicLink_TargetsDirectory_Create_IncludeSubdirectories	#124628

Summary

24-Hour Hit Count	7-Day Hit Count	1-Month Count
6	8	8

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[MihuBot]

I'm a bot. Here is a possible duplicate issue (I may be wrong):

• FileSystemWatcher does not raise events when target directory is symlink (on linux) #25078

[danmoseley]

above issue is linux, this is macos