Issues

• Linux: concurrent named-mutex creation fails with mkdirat(...) == -1; errno == ENOENT on 10.0.13 (PAL rename replaces another process's .dotnet/shm)

  area-System.Threadinguntriaged
  dotnet/runtime#136236 · Filter by author kierenj opened on Oct 21, 2026
  3

• release/10.0 is not building due to a MsQuic Schannel dependency warning-as-error.

  area-Infrastructure-librariesblocking-clean-ciKnown Build Erroruntriaged
  dotnet/runtime#136232 · Filter by author ViveliDuCh opened on Oct 21, 2026
  1

• release/10.0 is not building due to System.Security.Cryptography.Pkcs vulnerability warnings-as-errors.

  area-Hostblocking-clean-ciKnown Build Erroruntriaged
  dotnet/runtime#136231 · Filter by author ViveliDuCh opened on Oct 21, 2026

• JIT: p[i] += x through a pointer keeps the element address in a register instead of using an addressing mode

  area-CodeGen-coreclrtenet-performanceuntriaged
  dotnet/runtime#136228 · Filter by author nlwolf opened on Oct 21, 2026
  1

• Concurrent XmlSerializer.Deserialize with separate XmlNodeReaders over a shared XmlDocument can corrupt NameTable and spin indefinitely

  area-Serializationuntriaged
  dotnet/runtime#136227 · Filter by author helderman opened on Oct 21, 2026

• Socket.SendFileAsync on Linux faults with ConnectionReset or SocketError instead of OperationAborted when the socket is disposed during the send

  area-System.Net.Socketsuntriaged
  dotnet/runtime#136224 · Filter by author caraioniurie47 opened on Oct 21, 2026
  1

• Workstation GC writes to an uncommitted bookkeeping page under a heap hard limit; request .NET 10 backport

  area-GC-coreclruntriaged
  dotnet/runtime#136222 · Filter by author agenthandler opened on Oct 21, 2026
  2

• [HTTP] Cookies RFC update

  area-System.Netenhancement
  dotnet/runtime#136219 · Filter by author ManickaP opened on Oct 21, 2026 · 12.0.0
  4

• Deadlock in the PAL between MAPMapPEFile and VirtualQuery on macOS arm64

  area-VM-coreclruntriaged
  dotnet/runtime#136217 · Filter by author andrei-balint opened on Oct 21, 2026
  2

• ZipArchive should report better error message for empty or invalid stream

  area-System.IO.Compressionuntriaged
  dotnet/runtime#136215 · Filter by author huoyaoyuan opened on Oct 21, 2026
  1

• TlsSession client on macOS does not send its configured client certificate

  area-System.Net.Securityuntriaged
  dotnet/runtime#136213 · Filter by author pcshrosbree opened on Oct 21, 2026
  1

• baseservices/threading/DeadThreads fails with stack overflow

  area-System.Threadingblocking-clean-ciKnown Build Erroruntriaged
  dotnet/runtime#136204 · Filter by author jkotas opened on Oct 21, 2026
  2

• NativeAOT shared library on linux-x64: first call into an [UnmanagedCallersOnly] export whose frame has a GS cookie (e.g. stackalloc) aborts the process

  area-NativeAOT-coreclruntriaged
  dotnet/runtime#136201 · Filter by author LaborJos opened on Oct 21, 2026
  1

  

• Hot reload: a static field added by EnC to a type in a collectible AssemblyLoadContext is read and written at the wrong address

  area-TypeSystem-coreclruntriaged
  dotnet/runtime#136199 · Filter by author mcalypso opened on Oct 21, 2026
  1

• Test failure: tracing/eventpipe/eventsvalidation/SampleProfilerSampleType/SampleProfilerSampleType.cmd

  area-Tracing-coreclrblocking-outerloopKnown Build Erroruntriaged
  dotnet/runtime#136197 · Filter by author VincentBu opened on Oct 21, 2026

• Test failure: global::Runtime_136000.TestEntryPoint()

  area-CodeGen-Interpreter-coreclrblocking-outerloopKnown Build Erroruntriaged
  dotnet/runtime#136196 · Filter by author VincentBu opened on Oct 21, 2026
  2

• [9.0][browser] BuildThenPublishWithAOT times out after logging result 42

  arch-wasmarea-Build-monoblocking-clean-ciKnown Build Erroros-browseruntriaged
  dotnet/runtime#136193 · Filter by author ViveliDuCh opened on Oct 21, 2026
  1

• SOS.Tests.DiagnosticCommandTests.DumpGcData tests failures

  area-Diagnostics-coreclrblocking-clean-ciKnown Build Erroruntriaged
  dotnet/runtime#136190 · Filter by author sbomer opened on Oct 20, 2026
  1

• [System.Text.Json] Replace JsonHelpers.IntegerRegex with a lexical scan

  area-System.Text.Jsonuntriaged
  dotnet/runtime#136184 · Filter by author tglowka opened on Oct 20, 2026
  8

• ILVerify does not check code that follows an unverifiable instruction

  area-Tools-ILVerificationuntriaged
  dotnet/runtime#136177 · Filter by author pcshrosbree opened on Oct 20, 2026
  1

• [Breaking change] Make managed NTLM authentication opt-in in .NET 12

  area-System.Net.Securitybreaking-changeneeds-breaking-change-doc-created
  dotnet/runtime#136174 · Filter by author wfurt opened on Oct 20, 2026 · 12.0.0
  2

• [API Proposal]: Add direct IBufferWriter<byte> output support to CborWriter similar to Utf8JsonWriter style

  api-suggestionarea-System.IOuntriaged
  dotnet/runtime#136164 · Filter by author sichanyoo opened on Oct 20, 2026
  1

• Http3 tests failing with "An error occurred while sending the request."

  area-System.Net.Httpblocking-clean-ciKnown Build Erroruntriaged
  dotnet/runtime#136162 · Filter by author jkotas opened on Oct 20, 2026
  1

• [API Proposal]: Optional .env configuration provider

  area-Extensions-Configurationuntriaged
  dotnet/runtime#136158 · Filter by author vladimir-aubrecht opened on Oct 20, 2026
  1

• "Illegal instruction: Attempted to execute an instruction code not defined by the processor" on stepping when debugger runs macOS ARM and debuggee is from Linux Amd64 docker container

  area-Diagnostics-coreclruntriaged
  dotnet/runtime#136157 · Filter by author eterekhin opened on Oct 20, 2026
  3