Issues

• Debugger side unlinks the target's clr-debug-pipe FIFOs after a failed connect attempt (regression from #123196)

  area-Diagnostics-coreclruntriaged
  dotnet/runtime#135119 · Filter by author pcshrosbree opened on Oct 2, 2026
  2

• [wasi][R2R] wasmtime OOM-killed at startup for System.Text.Json and RegularExpressions composites

  arch-wasmarea-ReadyToRunos-wasi
  dotnet/runtime#135118 · Filter by author lewing opened on Oct 2, 2026 · 12.0.0
  2

• [wasm] TensorPrimitives.Tan returns +0.0 for range-reduced Half inputs when Vector128 is accelerated without FMA

  arch-wasmarea-System.Numerics.Tensorsos-wasi
  dotnet/runtime#135117 · Filter by author lewing opened on Oct 2, 2026 · 12.0.0
  2

  

• [wasi][R2R] BFloat16 conversions from Int128/UInt128 produce wrong values

  arch-wasmarea-System.Numericsos-wasi
  dotnet/runtime#135116 · Filter by author lewing opened on Oct 2, 2026 · 12.0.0
  2

• Unix: attaching to a process that has no debugger transport waits 10 s and returns CORDBG_E_TIMEOUT, because the ENOENT from open() is discarded

  area-Diagnostics-coreclruntriaged
  dotnet/runtime#135113 · Filter by author pcshrosbree opened on Oct 2, 2026
  3

• Unix: mscordbi writes Debugger::m_RSRequestedSync before every debug event, but no Unix runtime reads it (about a third of the messages in a launch-and-stop session)

  area-Diagnostics-coreclruntriaged
  dotnet/runtime#135110 · Filter by author pcshrosbree opened on Oct 2, 2026
  1

• Linux: with #134717 in only one of mscordbi and coreclr, a short debugger event is still read with stale bytes (debuggee SIGSEGV, or a freed pointer freed again)

  area-Diagnostics-coreclruntriaged
  dotnet/runtime#135109 · Filter by author pcshrosbree opened on Oct 2, 2026
  1

• Regex: Compiled and source generator give wrong results for (?>.*\b) (regression in .NET 10)

  area-System.Text.RegularExpressionsuntriaged
  dotnet/runtime#135108 · Filter by author pawlos opened on Oct 2, 2026
  1

• NativeAOT returns null Type.Namespace for a nested generic type whose FullName includes a namespace

  area-NativeAOT-coreclruntriaged
  dotnet/runtime#135106 · Filter by author ReubenBond opened on Oct 2, 2026
  1

• Inconsistent handling of IPv6 scope in SocketsHttpHandler's connection pool

  area-System.Net.Http
  dotnet/runtime#135103 · Filter by author MihaZupan opened on Oct 2, 2026 · 12.0.0
  2

• [Mono] IsGenericMethod crashes when a parameter type's assembly is missing

  area-VM-meta-monountriaged
  dotnet/runtime#135102 · Filter by author pkuyo opened on Oct 2, 2026

• [ci-scan-feedback] Key build-break dedup on stable compiled-asset path

  agentic-workflowsarea-Infrastructureuntriaged
  dotnet/runtime#135099 · Filter by author github-actions opened on Oct 2, 2026
  1

• [iOS] Network enumeration can spin indefinitely when sysctl queries are denied

  area-System.Netos-ios
  dotnet/runtime#135098 · Filter by author simonrozsival opened on Oct 2, 2026 · 12.0.0
  3

• [ci-scan] Test failure: System.Net.Security.Tests.SslStreamTls13NetworkConformanceTests.ZeroByteWrite_OtherDataReceivedSuccessfully

  area-System.Net.Securityblocking-clean-ciKnown Build Erroruntriaged
  dotnet/runtime#135096 · Filter by author lewing opened on Oct 2, 2026
  1

• [ci-scan] Test failure: Android API 27 SSLStreamGetCipherSuite SIGSEGV

  area-System.Net.Securityblocking-clean-ci-optionalKnown Build Erroros-androiduntriaged
  dotnet/runtime#135094 · Filter by author simonrozsival opened on Oct 2, 2026
  2

• [Android][CoreCLR] Runtime-test merged runners skip all tests because the bundle path is passed as the filter

  area-Infrastructure-monoos-androiduntriaged
  dotnet/runtime#135092 · Filter by author simonrozsival opened on Oct 2, 2026
  2

• [Blazor WebAssembly] Recover from cached HTTP errors and invalid boot resource responses

  arch-wasmarea-Infrastructureinvestigateos-browser
  Bug

  dotnet/runtime#135090 · Filter by author oroztocil opened on Oct 2, 2026 · Future
  3

• [ci-scan] Test failure: GCRefStress_AllVerificationsPass misses a Windows x86 PrestubMethodFrame root

  area-Diagnostics-coreclrblocking-clean-ciKnown Build Erroruntriaged
  dotnet/runtime#135086 · Filter by author radekdoulik opened on Oct 2, 2026
  1

• [ci-scan] Test failure: Microsoft.Diagnostics.DataContractReader.Tests.GCStress.CdacStressTests.GCRefStress_AllVerificationsPass (Windows x86 EventSource)

  area-Diagnostics-coreclrblocking-clean-ciKnown Build Erroruntriaged
  dotnet/runtime#135085 · Filter by author radekdoulik opened on Oct 2, 2026
  1

• [aw] CI Outer-Loop Failure Scanner failed

  agentic-workflowsarea-Infrastructure
  dotnet/runtime#135076 · Filter by author github-actions opened on Oct 2, 2026
  2

• [HTTP/2] HttpClient throws STREAM_CLOSED when server completes response + resets stream while client is still uploading a large request body

  area-System.Net.Http
  dotnet/runtime#135063 · Filter by author funkcj opened on Oct 1, 2026 · 12.0.0
  4

• Re-enabled ML-DSA External-Mu tests on Azure Linux

  area-System.Security
  dotnet/runtime#135061 · Filter by author vcsjones opened on Oct 1, 2026 · 12.0.0
  1

  

• Specialize single-threaded CoreCLR thread state for one native thread

  arch-wasmarea-VM-coreclruntriaged
  dotnet/runtime#135058 · Filter by author jkoritzinsky opened on Oct 1, 2026
  2

  

• Test failure: TensorTests.TensorExtensionsSpanInSpanOut<Single> Exp10M1 returns +∞ instead of a finite value near float.MaxValue

  area-System.Numerics.Tensorsblocking-clean-ciKnown Build Erroruntriaged
  dotnet/runtime#135056 · Filter by author lewing opened on Oct 1, 2026
  1

• .NET 10: PollGCWorker dominates EventPipe profiles due to sampling suspension

  area-Diagnostics-coreclrEventPipe
  dotnet/runtime#135050 · Filter by author EgorBo opened on Oct 1, 2026 · 12.0.0
  6