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[API Proposal]: Add OSPlatform.OpenBSD and OperatingSystem.IsOpenBSD APIs

api-suggestionEarly API idea and discussion, it is NOT ready for implementationEarly API idea and discussion, it is NOT ready for implementation

area-System.Runtime.InteropServices

os-openbsdOpenBSD OS, currently not officially supportedOpenBSD OS, currently not officially supported

untriagedNew issue has not been triaged by the area ownerNew issue has not been triaged by the area owner

Status: Open.

#129482 In dotnet/runtime;

· am11 opened on Jun 16, 2026

ConfigurationBinder silently coerces null into default values for non-nullable typed properties (JSON configuration provider)

area-Extensions-Configuration

untriagedNew issue has not been triaged by the area ownerNew issue has not been triaged by the area owner

Status: Open.

#129478 In dotnet/runtime;

· Justin-Nietzel opened on Jun 16, 2026

AccessViolationException in System.Text.Json.Serialization.Tests.StreamTests on Linux

arch-arm32

area-System.Text.Json

blocking-clean-ciBlocking PR or rolling runs of 'runtime' or 'runtime-extra-platforms'Blocking PR or rolling runs of 'runtime' or 'runtime-extra-platforms'

Known Build ErrorUse this to report build issues in the .NET Helix tabUse this to report build issues in the .NET Helix tab

untriagedNew issue has not been triaged by the area ownerNew issue has not been triaged by the area owner

Status: Open.

#129471 In dotnet/runtime;

· svick opened on Jun 16, 2026

Support generating multiple object files in NativeAOT ILC

area-NativeAOT-coreclr

untriagedNew issue has not been triaged by the area ownerNew issue has not been triaged by the area owner

Status: Open.

#129467 In dotnet/runtime;

· snikeguo opened on Jun 16, 2026

[ci-scan] Test failure: HandlerException assertion INTERPRETER_CODE_POISON in SetInterpreterCode

agentic-workflows

area-CodeGen-Interpreter-coreclr

blocking-clean-ciBlocking PR or rolling runs of 'runtime' or 'runtime-extra-platforms'Blocking PR or rolling runs of 'runtime' or 'runtime-extra-platforms'

Known Build ErrorUse this to report build issues in the .NET Helix tabUse this to report build issues in the .NET Helix tab

untriagedNew issue has not been triaged by the area ownerNew issue has not been triaged by the area owner

Status: Open.

#129465 In dotnet/runtime;

· github-actions opened on Jun 16, 2026

[API Proposal]: Add static methods System.Text.Rune.Parse and System.Text.Rune.TryParse to System.Text.Rune (without IFormatProvider? provider & not Explicit Interface Implementations)

api-suggestionEarly API idea and discussion, it is NOT ready for implementationEarly API idea and discussion, it is NOT ready for implementation

area-System.Runtime

untriagedNew issue has not been triaged by the area ownerNew issue has not been triaged by the area owner

Status: Open.

#129463 In dotnet/runtime;

· tats-u opened on Jun 16, 2026

Structs don't work with UnsafeAccessorType even if the target is a static method

area-System.Runtime.CompilerServices

untriagedNew issue has not been triaged by the area ownerNew issue has not been triaged by the area owner

Status: Open.

#129459 In dotnet/runtime;

· AFatNiBBa opened on Jun 16, 2026

ExecutionEngineException (Fatal CLR error 0x80131506) when resolving custom-attribute type arguments concurrently from multiple threads on .NET 10.0.5

area-System.Reflection

untriagedNew issue has not been triaged by the area ownerNew issue has not been triaged by the area owner

Status: Open.

#129458 In dotnet/runtime;

· batzen opened on Jun 16, 2026

Test failure: Microsoft.Extensions.Hosting.Internal.HostTests.HostLifetimeOnStartedDelaysStart

area-Extensions-Hosting

blocking-clean-ci-optionalBlocking optional rolling runsBlocking optional rolling runs

untriagedNew issue has not been triaged by the area ownerNew issue has not been triaged by the area owner

Status: Open.

#129450 In dotnet/runtime;

· VincentBu opened on Jun 16, 2026

Segmentation fault in System.Net.Http.Functional.Tests on macOS on 8.0

area-System.Net.Http

blocking-clean-ciBlocking PR or rolling runs of 'runtime' or 'runtime-extra-platforms'Blocking PR or rolling runs of 'runtime' or 'runtime-extra-platforms'

Known Build ErrorUse this to report build issues in the .NET Helix tabUse this to report build issues in the .NET Helix tab

untriagedNew issue has not been triaged by the area ownerNew issue has not been triaged by the area owner

Status: Open.

#129439 In dotnet/runtime;

· svick opened on Jun 15, 2026

[API Proposal]: MetadataUpdateHandlerAttribute with BeforeChange method

api-suggestionEarly API idea and discussion, it is NOT ready for implementationEarly API idea and discussion, it is NOT ready for implementation

area-Diagnostics-coreclr

untriagedNew issue has not been triaged by the area ownerNew issue has not been triaged by the area owner

Status: Open.

#129438 In dotnet/runtime;

· miroljub1995 opened on Jun 15, 2026

Sve_GatherVectorFirstFaulting_Bases_double_ulong failing on Linux on 9.0

area-CodeGen-coreclrCLR JIT compiler in src/coreclr/src/jit and related components such as SuperPMICLR JIT compiler in src/coreclr/src/jit and related components such as SuperPMI

blocking-clean-ciBlocking PR or rolling runs of 'runtime' or 'runtime-extra-platforms'Blocking PR or rolling runs of 'runtime' or 'runtime-extra-platforms'

Known Build ErrorUse this to report build issues in the .NET Helix tabUse this to report build issues in the .NET Helix tab

Status: Open.

#129437 In dotnet/runtime;

· svick opened on Jun 15, 2026

·  

11.0.0