Several System.Net.XXX tests like System.Net.NetworkInformation.Functional.Tests, System.Net.Primitives.Pal.Tests, System.Net.Quic.Functional.Tests are failing in the CI with
Assertion failed.
Interop.Sys.LSeek(this, 0, Interop.Sys.SeekWhence.SEEK_CUR) >= 0
at Microsoft.Win32.SafeHandles.SafeFileHandle.Open(String fullPath, FileMode mode, FileAccess access, FileShare share, FileOptions options, Int64 preallocationSize, UnixFileMode openPermissions, Int64& fileLength, UnixFileMode& filePermissions, Boolean failForSymlink, Boolean& wasSymlink, Func`4 createOpenException) in /_/src/libraries/System.Private.CoreLib/src/Microsoft/Win32/SafeHandles/SafeFileHandle.Unix.cs:line 208
at System.IO.Strategies.OSFileStreamStrategy..ctor(String path, FileMode mode, FileAccess access, FileShare share, FileOptions options, Int64 preallocationSize, Nullable`1 unixCreateMode) in /_/src/libraries/System.Private.CoreLib/src/System/IO/Strategies/OSFileStreamStrategy.cs:line 46
etc...
{
"ErrorMessage": ["Assertion failed.","Interop.Sys.LSeek"],
"ErrorPattern": "",
"BuildRetry": false,
"ExcludeConsoleLog": false
}
Several System.Net.XXX tests like System.Net.NetworkInformation.Functional.Tests, System.Net.Primitives.Pal.Tests, System.Net.Quic.Functional.Tests are failing in the CI with
See e.g.
https://dev.azure.com/dnceng-public/public/_build/results?buildId=1168801&view=ms.vss-test-web.build-test-results-tab&runId=32334092&resultId=218135&paneView=debug
Known Issue Error Message
Fill the error message using step by step known issues guidance.
{ "ErrorMessage": ["Assertion failed.","Interop.Sys.LSeek"], "ErrorPattern": "", "BuildRetry": false, "ExcludeConsoleLog": false }Known issue validation
Build: 🔎 https://dev.azure.com/dnceng-public/public/_build/results?buildId=1168801
Error message validated:
[Assertion failed. Interop.Sys.LSeek]Result validation: ✅ Known issue matched with the provided build.
Validation performed at: 10/9/2025 8:43:26 PM UTC
Report
Summary