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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

A Regex instance is extremely inefficient in multi threaded scenario

area-System.Text.RegularExpressions

tenet-performancePerformance related issuePerformance related issue

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

Status: Open.

#129445 In dotnet/runtime;

· ayende opened on Jun 15, 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

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

Status: Open.

#129437 In dotnet/runtime;

· svick opened on Jun 15, 2026

JsonSchemaExporter drops the null branch for double?/float? properties under JsonNumberHandling.AllowNamedFloatingPointLiterals

area-System.Text.Json

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

Status: Open.

#129432 In dotnet/runtime;

· sdukehart-omnesoft opened on Jun 15, 2026

[ci-scan] Test failure: superpmi-replay windows-arm64 no MCH files available

agentic-workflows

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.

#129427 In dotnet/runtime;

· github-actions opened on Jun 15, 2026

Generic type nested enum type reflection regression on .NET 9.0+

area-System.Reflection

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

Status: Open.

#129423 In dotnet/runtime;

· hrumhurum opened on Jun 15, 2026

CrossApartmentQueryInterface_NoDeadlock test crash on 9.0

area-Interop-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.

#129421 In dotnet/runtime;

· svick opened on Jun 15, 2026

Unreachable conditional branch in RBDeleteFixup (file RbTree.cs)

area-System.Data

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

Status: Open.

#129419 In dotnet/runtime;

· Babaijan opened on Jun 15, 2026

[ci-scan-feedback] Strengthen dedup queries and block JIT/GC workarounds

agentic-workflows

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

Status: Open.

#129418 In dotnet/runtime;

· github-actions opened on Jun 15, 2026

Potential unbounded allocation in SizeOfField for ELEMENT_TYPE_ARRAY metadata signatures

area-ILTools-coreclr

Status: Open.

#129417 In dotnet/runtime;

· Babaijan opened on Jun 15, 2026