Remote Attach Debugger is not working in .NET 9 + Docker

Created September 16, 2025 20:11

I have a .NET 9 console app. I use Attach to process > Docker > <My Container> > Install tools to the container > Attach

The app runs and hits my breakpoint. I F10 to go to the next line and the debugger exits (acting like I hit F5). I also tried going through the UI and the behavior is the same. In my production app, its far worse. When I attach a remote debugger I get a .NET memory corruption error (System.ExecutionEngineException). This all started happening when we upgraded to .NET 9.

Docker Desktop 4.43.2 (199162)

2 comments

Mackey Brian

Created September 17, 2025 15:54

Error Message:

Process terminated. InternalError
at System.Environment.FailFast(System.Runtime.CompilerServices.StackCrawlMarkHandle, System.String, System.Runtime.CompilerServices.ObjectHandleOnStack, System.String)
at System.Environment.FailFast(System.Threading.StackCrawlMark ByRef, System.String, System.Exception, System.String)
at System.Environment.FailFast(System.String)
at System.Runtime.EH.FallbackFailFast(System.Runtime.RhFailFastReason, System.Object)
at System.Runtime.EH.RhThrowHwEx(UInt32, ExInfo ByRef)
at MyAPI.Sites.GetSiteList+<Handle>d__1.MoveNext()
at System.Runtime.CompilerServices.AsyncMethodBuilderCore.Start[[System.__Canon, System.Private.CoreLib, Version=9.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]](System.__Canon ByRef)
at MyApi.Sites.GetSiteList.Handle(Sieve.Models.SieveModel, Sieve.Services.ISieveProcessor, Infrastructure.InfrastructureDbContext)
at DynamicClass.lambda_method907(System.Runtime.CompilerServices.Closure, System.Object, Microsoft.AspNetCore.Http.HttpContext)
at Microsoft.AspNetCore.Routing.EndpointMiddleware.Invoke(Microsoft.AspNetCore.Http.HttpContext)
at Microsoft.AspNetCore.Builder.Extensions.MapMiddleware.Invoke(Microsoft.AspNetCore.Http.HttpContext)
at Microsoft.AspNetCore.Builder.Extensions.MapMiddleware.Invoke(Microsoft.AspNetCore.Http.HttpContext)
at Microsoft.AspNetCore.Builder.Extensions.MapMiddleware.Invoke(Microsoft.AspNetCore.Http.HttpContext)
at Microsoft.AspNetCore.Builder.Extensions.MapMiddleware.Invoke(Microsoft.AspNetCore.Http.HttpContext)
at Microsoft.AspNetCore.Builder.Extensions.MapMiddleware.Invoke(Microsoft.AspNetCore.Http.HttpContext)
at Microsoft.AspNetCore.Builder.Extensions.MapMiddleware.Invoke(Microsoft.AspNetCore.Http.HttpContext)
at Microsoft.AspNetCore.Builder.Extensions.MapMiddleware.Invoke(Microsoft.AspNetCore.Http.HttpContext)
at Microsoft.AspNetCore.Authorization.Policy.AuthorizationMiddlewareResultHandler.HandleAsync(Microsoft.AspNetCore.Http.RequestDelegate, Microsoft.AspNetCore.Http.HttpContext, Microsoft.AspNetCore.Authorization.AuthorizationPolicy, Microsoft.AspNetCore.Authorization.Policy.PolicyAuthorizationResult)
at Microsoft.AspNetCore.Authorization.AuthorizationMiddleware+<Invoke>d__11.MoveNext()
at System.Runtime.CompilerServices.AsyncMethodBuilderCore.Start[[Microsoft.AspNetCore.Authorization.AuthorizationMiddleware+<Invoke>d__11, Microsoft.AspNetCore.Authorization.Policy, Version=9.0.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60]](<Invoke>d__11 ByRef)
at Microsoft.AspNetCore.Authorization.AuthorizationMiddleware.Invoke(Microsoft.AspNetCore.Http.HttpContext)
at Microsoft.AspNetCore.Authentication.AuthenticationMiddleware+<Invoke>d__6.MoveNext()
at System.Runtime.CompilerServices.AsyncMethodBuilderCore.Start[[Microsoft.AspNetCore.Authentication.AuthenticationMiddleware+<Invoke>d__6, Microsoft.AspNetCore.Authentication, Version=9.0.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60]](<Invoke>d__6 ByRef)
at Microsoft.AspNetCore.Diagnostics.ExceptionHandlerMiddlewareImpl.Invoke(Microsoft.AspNetCore.Http.HttpContext)
at Microsoft.AspNetCore.Builder.Extensions.MapWhenMiddleware.Invoke(Microsoft.AspNetCore.Http.HttpContext)
at Microsoft.AspNetCore.Builder.Extensions.MapWhenMiddleware.Invoke(Microsoft.AspNetCore.Http.HttpContext)
at Microsoft.AspNetCore.Builder.Extensions.MapWhenMiddleware.Invoke(Microsoft.AspNetCore.Http.HttpContext)
at Microsoft.AspNetCore.Cors.Infrastructure.CorsMiddleware.Invoke(Microsoft.AspNetCore.Http.HttpContext, Microsoft.AspNetCore.Cors.Infrastructure.ICorsPolicyProvider)
at Microsoft.AspNetCore.Routing.EndpointRoutingMiddleware.Invoke(Microsoft.AspNetCore.Http.HttpContext)
at Microsoft.AspNetCore.Builder.Extensions.UsePathBaseMiddleware+<InvokeCore>d__4.MoveNext()
at System.Runtime.CompilerServices.AsyncMethodBuilderCore.Start[[Microsoft.AspNetCore.Builder.Extensions.UsePathBaseMiddleware+<InvokeCore>d__4, Microsoft.AspNetCore.Http.Abstractions, Version=9.0.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60]](<InvokeCore>d__4 ByRef)
at Microsoft.AspNetCore.Builder.Extensions.UsePathBaseMiddleware.InvokeCore(Microsoft.AspNetCore.Http.HttpContext, Microsoft.AspNetCore.Http.PathString, Microsoft.AspNetCore.Http.PathString)
at Microsoft.AspNetCore.HostFiltering.HostFilteringMiddleware.Invoke(Microsoft.AspNetCore.Http.HttpContext)
at Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Http.HttpProtocol+<ProcessRequests>d__238`1[[System.__Canon, System.Private.CoreLib, Version=9.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].MoveNext()
at System.Runtime.CompilerServices.AsyncMethodBuilderCore.Start[[Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Http.HttpProtocol+<ProcessRequests>d__238`1[[System.__Canon, System.Private.CoreLib, Version=9.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]], Microsoft.AspNetCore.Server.Kestrel.Core, Version=9.0.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60]](<ProcessRequests>d__238`1<System.__Canon> ByRef)
at Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Http.HttpProtocol+<ProcessRequestsAsync>d__237`1[[System.__Canon, System.Private.CoreLib, Version=9.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].MoveNext()
at System.Runtime.CompilerServices.AsyncMethodBuilderCore.Start[[Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Http.HttpProtocol+<ProcessRequestsAsync>d__237`1[[System.__Canon, System.Private.CoreLib, Version=9.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]], Microsoft.AspNetCore.Server.Kestrel.Core, Version=9.0.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60]](<ProcessRequestsAsync>d__237`1<System.__Canon> ByRef)
at Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Http.HttpProtocol.ProcessRequestsAsync[[System.__Canon, System.Private.CoreLib, Version=9.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]](Microsoft.AspNetCore.Hosting.Server.IHttpApplication`1<System.__Canon>)
at Microsoft.AspNetCore.Server.Kestrel.Core.Internal.HttpConnection+<ProcessRequestsAsync>d__12`1[[System.__Canon, System.Private.CoreLib, Version=9.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].MoveNext()
at System.Runtime.CompilerServices.AsyncMethodBuilderCore.Start[[Microsoft.AspNetCore.Server.Kestrel.Core.Internal.HttpConnection+<ProcessRequestsAsync>d__12`1[[System.__Canon, System.Private.CoreLib, Version=9.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]], Microsoft.AspNetCore.Server.Kestrel.Core, Version=9.0.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60]](<ProcessRequestsAsync>d__12`1<System.__Canon> ByRef)
at Microsoft.AspNetCore.Server.Kestrel.Core.Internal.HttpConnectionMiddleware`1[[System.__Canon, System.Private.CoreLib, Version=9.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].OnConnectionAsync(Microsoft.AspNetCore.Connections.ConnectionContext)
at Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Infrastructure.KestrelConnection`1+<ExecuteAsync>d__8[[System.__Canon, System.Private.CoreLib, Version=9.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].MoveNext()
at System.Runtime.CompilerServices.AsyncMethodBuilderCore.Start[[Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Infrastructure.KestrelConnection`1+<ExecuteAsync>d__8[[System.__Canon, System.Private.CoreLib, Version=9.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]], Microsoft.AspNetCore.Server.Kestrel.Core, Version=9.0.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60]](<ExecuteAsync>d__8<System.__Canon> ByRef)
at Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Infrastructure.KestrelConnection`1[[System.__Canon, System.Private.CoreLib, Version=9.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].ExecuteAsync()
at Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Infrastructure.KestrelConnection`1[[System.__Canon, System.Private.CoreLib, Version=9.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].System.Threading.IThreadPoolWorkItem.Execute()
at System.Threading.ThreadPoolWorkQueue.Dispatch()
at System.Threading.PortableThreadPool+WorkerThread.WorkerThreadStart()

Tom Luo

Created September 18, 2025 07:44

Hello Mackey,

Thank you for contacting JetBrains Support.

For better tracking, let's focus on the first issue in this thread. I've just tested the same in my environment, and it works well.

To help us diagnose this issue, please provide the information below:

Instead of attaching to process, have you tried to debug directly using the docker run configuration? Did it work?
Share the dockfile
Collect Rider logs

Go to Help | Diagnostic tools | Choose Trace Scenarios;
Enable the trace scenario for Debugger, Docker
Reproduce the issue;
Collect the full log bundle via Help | Collect Logs and Diagnostic Data;
Disable the trace scenarios enabled;

Please upload the files to our upload service and share the ID.

As for the issue on production app, I haven't found similar issues yet. For further investigation, it's recommened to raise a new issue on our issue tracker with details and Rider logs (use same steps above)

Thanks,

Tom

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