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Running a .NET Framework 4.7.2 Windows Service on Windows 10/11 ARM64

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questionAnswer questions and provide assistance, not an issue with source code or documentation.Answer questions and provide assistance, not an issue with source code or documentation.

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

Status: Open.

#123303 In dotnet/runtime;

· viveknuna opened on Jan 17, 2026

Simpler nullcheck can be emitted

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

help wanted[up-for-grabs] Good issue for external contributors[up-for-grabs] Good issue for external contributors

Status: Open.

#123302 In dotnet/runtime;

· EgorBo opened on Jan 17, 2026

·  

Future

CSE CQ issue

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

Status: Open.

#123301 In dotnet/runtime;

· EgorBo opened on Jan 17, 2026

·  

Future

Possibly incorrect implementation of ILogB for BFloat16 and Half

area-System.Numerics

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

Status: Open.

#123293 In dotnet/runtime;

· vcsjones opened on Jan 16, 2026

Jit: Missing folding some compares in optimizebools

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

tenet-performancePerformance related issuePerformance related issue

Status: Open.

#123291 In dotnet/runtime;

· dhartglassMSFT opened on Jan 16, 2026

BFloat16 and Half Parse UTF-8 has inconsistent NumberStyles validation

area-System.Numerics

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

Status: Open.

#123289 In dotnet/runtime;

· vcsjones opened on Jan 16, 2026

BFloat16.TryWriteSignificand{Big,Little}Endian report 4 for bytesWritten

area-System.Numerics

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

Status: Open.

#123286 In dotnet/runtime;

· vcsjones opened on Jan 16, 2026

Assertion failed: <code>!CREATE_CHECK_STRING(bSmallObjectHeapPtr || bLargeObjectHeapPtr)</code>

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-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.

#123285 In dotnet/runtime;

· adamperlin opened on Jan 16, 2026

Enumerable.Concat() method throws an ArgumentOutOfRangeException if it is called after a Skip()

area-System.Linq

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

Status: Open.

#123284 In dotnet/runtime;

· pelmenin opened on Jan 16, 2026

Assertion failed: <code>(histogramSchemaIndex &gt;= 0) &amp;&amp; (histogramSchemaIndex &lt; (int)schema.size())</code>

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-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.

#123282 In dotnet/runtime;

· adamperlin opened on Jan 16, 2026

BitArray ShiftLeft and PopCount produce unexpected behavior

area-System.Collections

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

Status: Open.

#123281 In dotnet/runtime;

· vcsjones opened on Jan 16, 2026

Test failure: <code>System.Security.Cryptography.X509Certificates.Tests.X509FilesystemTests.AllFilesDeleted_MultiplePrivateKey_Ctor(storageFlags: MachineKeySet, capi: False)</code>

area-System.Security

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.

#123280 In dotnet/runtime;

· adamperlin opened on Jan 16, 2026