Test failure: System.IO.IOException : Too many open files

[jkotas]

Build Information

Build: https://dev.azure.com/dnceng-public/cbb18261-c48f-4abb-8651-8cdcb5474649/_build/results?buildId=1057538
Build error leg or test failing: System.Net.Sockets.Tests.WorkItemExecution
Pull request: #115339

Error Message

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

{
  "ErrorMessage": "System.IO.IOException : Too many open files",
  "ErrorPattern": "",
  "BuildRetry": false,
  "ExcludeConsoleLog": false
}

Known issue validation

Build: 🔎 https://dev.azure.com/dnceng-public/public/_build/results?buildId=1057538
Error message validated: [System.IO.IOException : Too many open files]
Result validation: ✅ Known issue matched with the provided build.
Validation performed at: 6/3/2025 7:51:18 PM UTC

Report

Build	Definition	Test	Pull Request
1059304	dotnet/runtime	System.Net.Sockets.Tests.WorkItemExecution
1058735	dotnet/runtime	System.Net.Sockets.Tests.SendPacketsAsync.SendPacketsElement_MissingFile_Throws	#108083
1058625	dotnet/runtime	System.Net.Sockets.Tests.SendPacketsAsync.SendPacketsElement_MissingFile_Throws
1058259	dotnet/runtime	System.Net.Sockets.Tests.WorkItemExecution
1057538	dotnet/runtime	System.Net.Sockets.Tests.WorkItemExecution	#115339

Summary

24-Hour Hit Count	7-Day Hit Count	1-Month Count
3	5	5

[jkotas]

Example:

[FAIL] System.Net.Sockets.Tests.SendPacketsAsync.SendPacketsElement_FileStreamLargeOffset_Throws
System.IO.IOException : Too many open files : '/tmp/czjwlgym.aoc_.ctor_39'
   at Interop.ThrowExceptionForIoErrno(Interop.ErrorInfo, String, Boolean) + 0x11
   at Microsoft.Win32.SafeHandles.SafeFileHandle.Open(String, Interop.Sys.OpenFlags, Int32, Boolean, Boolean&, Func`4) + 0x112
   at Microsoft.Win32.SafeHandles.SafeFileHandle.Open(String, FileMode, FileAccess, FileShare, FileOptions, Int64, UnixFileMode, Int64&, UnixFileMode&, Boolean, Boolean&, Func`4) + 0x107
   at System.IO.File.OpenHandle(String, FileMode, FileAccess, FileShare, FileOptions, Int64) + 0x96
   at System.IO.File.WriteAllBytes(String, ReadOnlySpan`1) + 0x38
   at System.Net.Sockets.Tests.SendPacketsAsync..ctor(ITestOutputHelper output) + 0xe9

[jkotas]

This run on (azurelinux.3.amd64.open.rt) using docker image mcr.microsoft.com/dotnet-buildtools/prereqs:debian-13-helix-amd64

@richlander Do we still have the problem with misconfigured Azure Linux containerd or are they supposed to be fixed now?

[richlander]

Not fixed. I believe the new VM is supposed to rollout tomorrow.

@epananth

[richlander]

This should now be resolved.