In-process (.NET, Windows): access violation in copilot_runtime_connection_write when responding to runtime requests

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Avaliação

Dificuldade
4/5
Tempo estimado
3-5 dias
Facilidade para iniciantes
43/100
Tipo de issue
Bug
Clareza
Razoavelmente clara
Status de atividade
Ativa
Stack de tecnologia
csharp, typescript
Domínio
backend, devtools

Direção de pesquisa

Start by tracing the .NET in-process response path from FfiRuntimeHost.SendFrame through JsonRpc.SendResultResponseAsync, then inspect the native copilot_runtime_connection_write implementation and its connection lifecycle. Try to reproduce on Windows x64 with parallel MCP tool calls using the reported SDK/runtime versions; done means writes either succeed or report a managed error without crashing the host.

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Descrição

Summary

With in-process hosting (RuntimeConnection.ForInProcess()) on Windows x64, the host process dies with an access violation (0xC0000005) inside the native copilot_runtime_connection_write while the .NET SDK writes a response frame. It happens mid-turn in long agent sessions and takes down the whole host application.

Versions

  • GitHub.Copilot.SDK 1.0.16 (runtime 1.0.89) and 1.0.17 (runtime 1.0.93); reproduced on both
  • .NET 10, win-x64, self-contained WPF app, in-process hosting
  • Session config: OnPreToolUse hook (synchronous, returns allow), OnPermissionRequest handler (synchronous allow), OnUserInputRequest, OnElicitationRequest, an HTTP MCP server with many tools, AskUserVariant.Elicitation, a custom provider pointed at a loopback HTTP endpoint

Stack (1.0.17)

Fatal error.
0xC0000005
   at GitHub.Copilot.FfiRuntimeHost.<ConnectionWrite>g____PInvoke|55_0(UInt32, Byte*, UIntPtr)
   at GitHub.Copilot.FfiRuntimeHost.SendFrame(System.ReadOnlySpan`1<Byte>)
   at GitHub.Copilot.JsonRpc+<SendMessageAsync>d__35`1[[System.__Canon, ...]].MoveNext()
   at GitHub.Copilot.JsonRpc+<SendResultResponseAsync>d__46.MoveNext()
   at GitHub.Copilot.JsonRpc.SendResultResponseAsync(System.Text.Json.JsonElement, System.Object, System.Type, System.Threading.CancellationToken)
   at GitHub.Copilot.JsonRpc+<HandleIncomingMethodAsync>d__41.MoveNext()
   at GitHub.Copilot.JsonRpc+<ReadLoopAsync>d__37.MoveNext()
   ...
   at GitHub.Copilot.JsonRpc+<ReadMessageAsync>d__39.MoveNext()
   ...
   at GitHub.Copilot.FfiRuntimeHost+CallbackReceiveStream+<ReadAsync>d__4.MoveNext()
   ...
   at GitHub.Copilot.FfiRuntimeHost+CallbackReceiveStream+<ReadCoreAsync>d__5.MoveNext()
   at System.Threading.ThreadPoolWorkQueue.Dispatch()
   at System.Threading.PortableThreadPool+WorkerThread.WorkerThreadStart()

On 1.0.16 the same fault came through JsonRpc.SendMessageAsync from CopilotSession.HandlePendingPermissionRequestAsync.

Pattern

Both crashes happened right after the model issued two MCP tool calls in parallel. The host log shows two preToolUse approvals, then two permission-request approvals, then an MCP HTTP call returning 200, and then the fault while writing a response frame back to the runtime. FfiRuntimeHost.SendFrame already holds _lifecycleLock and checks _disposed and _connectionId, so the managed side does not seem to be writing concurrently or after close. The fault appears to be in the native write path.

Frequency: about 1 crash in 15–20 multi-tool conversations when replaying real user sessions (each 1–4 turns, 10–60 tool calls). Single-turn tests and a 40-turn sequential stress run did not reproduce it, so concurrency between parallel tool calls looks like a factor.

Possibly related: on 1.0.16 we also saw one turn hang forever. The session's events.jsonl had hook.start for preToolUse with no matching hook.end, even though our hook returns synchronously.

Expected

A response write to an open connection either succeeds or fails with a managed error. It should never crash the host process.

Happy to run a build with extra native logging if that helps.

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