Issues

• x86: since #135793, localloc epilogs use mov esp, ebp, which the GC-info epilog decoder rejects (assert in SKIP_LEA_ESP_EBP)

  area-CodeGen-coreclruntriaged
  dotnet/runtime#136020 · Filter by author pcshrosbree opened on Oct 18, 2026
  1

• Malformed XML doc comments under src/coreclr/tools break the build when GenerateDocumentationFile is on

  area-Tools-ILLinkuntriaged
  dotnet/runtime#136017 · Filter by author pcshrosbree opened on Oct 18, 2026
  1

• Runtime-created threads don't follow cgroup cpuset changes on Linux 6.2+

  area-System.Threadingos-linuxuntriaged
  dotnet/runtime#136015 · Filter by author Hekzory opened on Oct 18, 2026
  1

• Bump emsdk to >= 6.0.10 to pick up memory.copy-based memmove (overlapping Span.CopyTo is 4-5x slower on CoreCLR wasm)

  arch-wasmarea-System.Memoryos-browser
  dotnet/runtime#136012 · Filter by author lewing opened on Oct 17, 2026 · 12.0.0
  5

  

• Helper-based tail call with a Span<double> argument corrupts memory (Windows x64, Debug/MinOpts)

  area-CodeGen-coreclruntriaged
  dotnet/runtime#136010 · Filter by author marklam opened on Oct 17, 2026
  1

• An AssemblyLoadContext whose ToString() returns null crashes the process on a cross-context InvalidCastException or under binder tracing

  area-System.Runtimeuntriaged
  dotnet/runtime#136008 · Filter by author pcshrosbree opened on Oct 17, 2026
  1

• [NativeAOT][macOS x64] .NET 11 RC2 publish fails with unaligned GSS descriptor in libSystem.Net.Security.Native.a

  area-NativeAOT-coreclruntriaged
  dotnet/runtime#136007 · Filter by author afscrome opened on Oct 17, 2026
  2

• [RuntimeAsync] Intermittent GC crash in standalone safe C# repro on .NET 11 RC2 (Windows x64, Debug)

  area-CodeGen-coreclrruntime-asyncuntriaged
  dotnet/runtime#136004 · Filter by author yself opened on Oct 17, 2026
  2

• Generic virtual method call never returns after a collectible AssemblyLoadContext is collected and the same assembly is loaded again (.NET 10 regression)

  area-VM-coreclruntriaged
  dotnet/runtime#136003 · Filter by author katout opened on Oct 17, 2026
  4

• RuntimeAsync: a byref-like struct local holding object references is stored into the continuation without a GC write barrier

  area-CodeGen-coreclrruntime-asyncuntriaged
  dotnet/runtime#136000 · Filter by author libu1129 opened on Oct 17, 2026
  1

• Disposing SocketsHttpHandler leaks HTTP/2 connections (socket, SslStream, native TLS state) when PooledConnectionLifetime is TimeSpan.Zero

  area-System.Net.Http
  dotnet/runtime#135997 · Filter by author endomorphine opened on Oct 17, 2026
  1

• Socket.Poll(SelectError) does not report out-of-band data on macOS, iOS, tvOS and Mac Catalyst

  area-System.Net.Socketsuntriaged
  dotnet/runtime#135995 · Filter by author caraioniurie47 opened on Oct 17, 2026
  1

• API Proposal: NativeArena for Scoped Native Memory Allocation

  api-suggestionarea-System.Runtime.InteropServices
  dotnet/runtime#135986 · Filter by author SkyDevLab opened on Oct 16, 2026 · Future
  10

• [RyuJIT Wasm] Codegen Quality Improvements

  arch-wasmarea-CodeGen-coreclrtenet-performance
  dotnet/runtime#135985 · Filter by author adamperlin opened on Oct 16, 2026 · 12.0.0
  2

  

• [Wasm][CoreCLR] Preserve native remainder instead of expanding constant MOD to SUB/MUL/DIV

  arch-wasmarea-CodeGen-coreclrtenet-performance
  dotnet/runtime#135982 · Filter by author adamperlin opened on Oct 16, 2026 · 12.0.0
  2

  

• [Wasm][CoreCLR] Enable GC-correct reference/byref locals to avoid hot-loop frame traffic

  arch-wasmarea-CodeGen-coreclrtenet-performanceuntriaged
  dotnet/runtime#135980 · Filter by author adamperlin opened on Oct 16, 2026
  2

  

• [Wasm][CoreCLR] Loop-hoisting profitability uses a negative native-register budget

  arch-wasmarea-CodeGen-coreclrtenet-performanceuntriaged
  dotnet/runtime#135979 · Filter by author adamperlin opened on Oct 16, 2026
  2

• [OptionsValidator]: 11.0 drops the type name from a member's display name (ServerOptions.Host → Host) but keeps a named instance's name (Backup.Host). Intended?

  area-Extensions-Optionsuntriaged
  dotnet/runtime#135978 · Filter by author AdCodicem opened on Oct 16, 2026
  1

• Regex source generator ignores cultureName when deduplicating [GeneratedRegex] declarations and when it falls back to new Regex(...)

  area-System.Text.RegularExpressionsuntriaged
  dotnet/runtime#135977 · Filter by author AdCodicem opened on Oct 16, 2026
  1

• Support distributed trace-context propagation across parent/child process invocations

  area-System.Diagnostics.Tracinguntriaged
  dotnet/runtime#135971 · Filter by author DamianEdwards opened on Oct 16, 2026
  1

• A zero-length ReadAsync on the serial base stream never completes on Windows.

  area-System.IO.Portsuntriaged
  dotnet/runtime#135969 · Filter by author wjohnstonsolventum opened on Oct 16, 2026
  1

• [wasm/R2R] TypeIntrinsics_r: GC reports uninitialized frame slots during throw-helper calls (pMT->Validate assert)

  arch-wasmarea-VM-coreclrblocking-clean-ciKnown Build Erroruntriaged
  dotnet/runtime#135966 · Filter by author lewing opened on Oct 16, 2026
  3

  

• Allow TypeMap trim targets to depend on the exact array type

  area-Tools-ILLinkuntriaged
  dotnet/runtime#135964 · Filter by author NinoFloris opened on Oct 16, 2026
  2

• [dnceng-bot] Branch runtime/release/8.0 can't be merged to Azdo internal branch

  area-Infrastructureuntriaged
  dotnet/runtime#135960 · Filter by author dotnet-mirroring opened on Oct 16, 2026
  1

• [dnceng-bot] Branch runtime/release/9.0 can't be merged to Azdo internal branch

  area-Infrastructureuntriaged
  dotnet/runtime#135930 · Filter by author dotnet-mirroring opened on Oct 16, 2026
  1