While remotely debugging a Linux ARM64 program, the program abruptly exits when calling `UnmanagedCallersOnly` function in another library

[JinShil]

Type: Bug

Issue Description

When remotely debugging and ARM64 program, when the program reaches a call to an UnmanagedCallersOnly function in another library, it abruptly exits without throwing any Exceptions.

The program runs fine when run via an SSH session, or when executed locally on the Linux ARM64 device. The symptom only occurs when the program is being debugged.

The symptom does not occur when P/Invoking a libc function like abs. It only seems to occur when P/Invoking an UnmanagedCallersOnly function

The symptom does not occur on an Linux x64 target device. It only seems to occur on a Linux ARM64 device.

The symptom also occurs when using Visual Studio 2022 and launch profiles indicating the debugger infrastructure common to both Visual Studio 2022 and Visual Studio Code is the culprit.

The symptom occurs whether the development computer running Visual Studio Code is Widows or Linux.

Steps to Reproduce

1. Obtain a Linux ARM64 device. A Raspberry Pi 4 or Raspberry Pi 5 will do fine.
2. Install the .NET SDK to the Linux ARM64 device.
3. Install vsdbg to the Linux ARM64 device.
4. Create a .NET library with an UnmanagedCallersOnly function, and AoT compile it on the Linux ARM64 device.
5. Create a .NET console application that P/Invokes the UnmanagedCallersOnly function using DLLImport.
6. Remotely debug the .NET console application.
7. Step through the application and observe that when a call the UnmanagedCallersOnly function is reached, the application abruptly exists.
8. Run the program locally on the Linux ARM64 device, and observe that it runs fine.

Using the Attached Demonstration Project

vsdbg_bug.zip

1. Obtain a Linux ARM64 device. A Raspberry Pi 4 or Raspberry Pi 5 will do fine.
2. Install the .NET SDK to the Linux ARM64 device.
3. Install vsdbg to the Linux ARM64 device.
4. Open the attached demonstration project in Visual Studio Code
5. Adjust the .vscode/settings.json file for your environment
6. Press F5 to compile all the software, deploy it to the Linux ARM64 device, and launch it.
7. Step through the application and observe that when a call the UnmanagedCallersOnly function is reached, the application abruptly exists.
8. Run the program locally on the Linux ARM64 device, and observe that it runs fine.

Expected Behavior

One should be able to step through the application without the program abruptly exiting when it attempts to call an UnmanagedCallersOnly function.

Actual Behavior

While stepping through the program, when the program attempts to call an UnmanagedCallersOnly function, the program being debugged abruptly exits without throwing any Exceptions.

Logs

OmniSharp log

Starting OmniSharp server at 5/29/2025, 11:32:05 AM
    Target: c:\Users\Mike\Desktop\vsdbg_bug

OmniSharp server started with .NET 10.0.100-preview.4.25258.110
.
    Path: c:\Users\Mike\.vscode\extensions\ms-dotnettools.csharp-2.76.27-win32-x64\.omnisharp\1.39.12-net6.0\OmniSharp.dll
    PID: 15460

[info]: OmniSharp.Stdio.Host
        Starting OmniSharp on Windows 10.0.26100.0 (x64)
[info]: OmniSharp.Services.DotNetCliService
        Checking the 'DOTNET_ROOT' environment variable to find a .NET SDK
[info]: OmniSharp.Services.DotNetCliService
        Using the 'dotnet' on the PATH.
[info]: OmniSharp.Services.DotNetCliService
        DotNetPath set to dotnet
[info]: OmniSharp.MSBuild.Discovery.MSBuildLocator
        Located 4 MSBuild instance(s)
            1: .NET Core SDK 10.0.100 17.15.0 - "C:\Program Files\dotnet\sdk\10.0.100-preview.4.25258.110"
            2: .NET Core SDK 9.0.300 17.14.5 - "C:\Program Files\dotnet\sdk\9.0.300"
            3: .NET Core SDK 9.0.100 17.12.7 - "C:\Program Files\dotnet\sdk\9.0.100"
            4: .NET Core SDK 8.0.303 17.10.4 - "C:\Program Files\dotnet\sdk\8.0.303"
[info]: OmniSharp.MSBuild.Discovery.MSBuildLocator
        Registered MSBuild instance: .NET Core SDK 10.0.100 17.15.0 - "C:\Program Files\dotnet\sdk\10.0.100-preview.4.25258.110"
[info]: OmniSharp.WorkspaceInitializer
        Invoking Workspace Options Provider: OmniSharp.Roslyn.CSharp.Services.CSharpFormattingWorkspaceOptionsProvider, Order: 0
[info]: OmniSharp.Cake.CakeProjectSystem
        Detecting Cake files in 'c:\Users\Mike\Desktop\vsdbg_bug\'.
[info]: OmniSharp.Cake.CakeProjectSystem
        Did not find any Cake files
[info]: OmniSharp.MSBuild.ProjectSystem
        No solution files found in 'c:\Users\Mike\Desktop\vsdbg_bug\'
[info]: OmniSharp.MSBuild.ProjectManager
        Queue project update for 'c:\Users\Mike\Desktop\vsdbg_bug\App\App.csproj'
[info]: OmniSharp.MSBuild.ProjectManager
        Queue project update for 'c:\Users\Mike\Desktop\vsdbg_bug\Native\Native.csproj'
[info]: OmniSharp.Script.ScriptProjectSystem
        Detecting CSX files in 'c:\Users\Mike\Desktop\vsdbg_bug\'.
[info]: OmniSharp.Script.ScriptProjectSystem
        Did not find any CSX files
[info]: OmniSharp.WorkspaceInitializer
        Configuration finished.
[info]: OmniSharp.Stdio.Host
        Omnisharp server running using Stdio at location 'c:\Users\Mike\Desktop\vsdbg_bug\' on host 10232.
[info]: OmniSharp.MSBuild.ProjectManager
        Loading project: c:\Users\Mike\Desktop\vsdbg_bug\App\App.csproj
[info]: OmniSharp.MSBuild.ProjectManager
        Successfully loaded project file 'c:\Users\Mike\Desktop\vsdbg_bug\App\App.csproj'.
[info]: OmniSharp.MSBuild.ProjectManager
        Adding project 'c:\Users\Mike\Desktop\vsdbg_bug\App\App.csproj'
[info]: OmniSharp.MSBuild.ProjectManager
        Loading project: c:\Users\Mike\Desktop\vsdbg_bug\Native\Native.csproj
[info]: OmniSharp.MSBuild.ProjectManager
        Successfully loaded project file 'c:\Users\Mike\Desktop\vsdbg_bug\Native\Native.csproj'.
[info]: OmniSharp.MSBuild.ProjectManager
        Adding project 'c:\Users\Mike\Desktop\vsdbg_bug\Native\Native.csproj'
[info]: OmniSharp.MSBuild.ProjectManager
        Update project: App
[info]: OmniSharp.MSBuild.ProjectManager
        Update project: Native
[info]: OmniSharp.Roslyn.CSharp.Services.Diagnostics.CSharpDiagnosticWorkerWithAnalyzers
        Solution initialized -> queue all documents for code analysis. Initial document count: 2.
[info]: OmniSharp.MSBuild.ProjectManager
        Queue project update for 'c:\Users\Mike\Desktop\vsdbg_bug\App\App.csproj'
[info]: OmniSharp.MSBuild.ProjectManager
        Loading project: c:\Users\Mike\Desktop\vsdbg_bug\App\App.csproj
[info]: OmniSharp.MSBuild.ProjectManager
        Successfully loaded project file 'c:\Users\Mike\Desktop\vsdbg_bug\App\App.csproj'.
[info]: OmniSharp.MSBuild.ProjectManager
        Update project: App
[info]: OmniSharp.Roslyn.CSharp.Services.Diagnostics.CSharpDiagnosticWorkerWithAnalyzers
        Analyzer work cancelled.
[info]: OmniSharp.MSBuild.ProjectManager
        Queue project update for 'c:\Users\Mike\Desktop\vsdbg_bug\App\App.csproj'
[info]: OmniSharp.MSBuild.ProjectManager
        Queue project update for 'c:\Users\Mike\Desktop\vsdbg_bug\App\App.csproj'
[info]: OmniSharp.MSBuild.ProjectManager
        Queue project update for 'c:\Users\Mike\Desktop\vsdbg_bug\App\App.csproj'
[info]: OmniSharp.MSBuild.ProjectManager
        Loading project: c:\Users\Mike\Desktop\vsdbg_bug\App\App.csproj
[info]: OmniSharp.MSBuild.ProjectManager
        Successfully loaded project file 'c:\Users\Mike\Desktop\vsdbg_bug\App\App.csproj'.
[info]: OmniSharp.MSBuild.ProjectManager
        Update project: App
[info]: OmniSharp.OmniSharpWorkspace
        Miscellaneous file: c:\Users\Mike\Desktop\vsdbg_bug\App\obj\Debug\net8.0\linux-arm64\.NETCoreApp,Version=v8.0.AssemblyAttributes.cs added to workspace
[info]: OmniSharp.OmniSharpWorkspace
        Miscellaneous file: c:\Users\Mike\Desktop\vsdbg_bug\App\obj\Debug\net8.0\linux-arm64\App.AssemblyInfo.cs added to workspace
[info]: OmniSharp.OmniSharpWorkspace
        Miscellaneous file: c:\Users\Mike\Desktop\vsdbg_bug\App\obj\Debug\net8.0\linux-arm64\App.GlobalUsings.g.cs added to workspace
[warn]: OmniSharp.Roslyn.CSharp.Services.Navigation.FindUsagesService
        No symbol found. File: c:\Users\Mike\Desktop\vsdbg_bug\App\Program.cs, Line: 6, Column: 18.

Debugger Engine Log

Starting: "ssh" pi@192.168.0.10 "/opt/Microsoft/vsdbg/vsdbg --interpreter=vscode"
-> (C) {"command":"initialize","arguments":{"clientID":"vscode","clientName":"Visual Studio Code","adapterID":"coreclr","pathFormat":"path","linesStartAt1":true,"columnsStartAt1":true,"supportsVariableType":true,"supportsVariablePaging":true,"supportsRunInTerminalRequest":true,"locale":"en","supportsProgressReporting":true,"supportsInvalidatedEvent":true,"supportsMemoryReferences":true,"supportsArgsCanBeInterpretedByShell":true,"supportsMemoryEvent":true,"supportsStartDebuggingRequest":true,"supportsANSIStyling":true},"type":"request","seq":1}
Error from pipe program 'ssh': Warning: Permanently added '192.168.0.10' (ED25519) to the list of known hosts.
-> (C) {"command":"launch","arguments":{"name":"Remote Debug","type":"coreclr","request":"launch","preLaunchTask":"postdeploy","program":"App","args":[],"cwd":"debug/","stopAtEntry":false,"console":"internalConsole","pipeTransport":{"pipeCwd":"C:\\Users\\Mike\\Desktop\\vsdbg_bug","pipeProgram":"ssh","pipeArgs":["pi@192.168.0.10"],"debuggerPath":"/opt/Microsoft/vsdbg/vsdbg"},"env":{"DISPLAY":":0.0"},"logging":{"moduleLoad":true,"trace":true,"exceptions":true,"engineLogging":false},"__configurationTarget":6,"justMyCode":true,"requireExactSource":true,"enableStepFiltering":true,"suppressJITOptimizations":false,"symbolOptions":{"searchPaths":[],"searchMicrosoftSymbolServer":false,"searchNuGetOrgSymbolServer":false,"cachePath":"","moduleFilter":{"mode":"loadAllButExcluded","excludedModules":[],"includedModules":[],"includeSymbolsNextToModules":true,"includeSymbolsOnDemand":true}},"expressionEvaluationOptions":{"allowImplicitFuncEval":true,"allowToString":true,"allowFastEvaluate":true,"showRawValues":false},"internalConsoleOptions":"openOnSessionStart","__sessionId":"e4c16b1d-52b6-43a0-a460-4bdac13ec74c"},"type":"request","seq":2}
------------------------------------------------------------------------------
You may only use the Microsoft Visual Studio .NET/C/C++ Debugger (vsdbg) with
Visual Studio Code, Visual Studio or Visual Studio for Mac software to help you
develop and test your applications.
------------------------------------------------------------------------------
<- (R) {"seq":4,"type":"response","request_seq":2,"success":true,"command":"launch"}
<- (E) {"seq":5,"type":"event","event":"initialized","body":{}}
-> (C) {"command":"setBreakpoints","arguments":{"source":{"name":"Program.cs","path":"c:\\Users\\Mike\\Desktop\\vsdbg_bug\\App\\Program.cs","checksums":[{"algorithm":"SHA1","checksum":"d081a3fa916db757b17a5c5024fa190c23316841"},{"algorithm":"SHA256","checksum":"ad92c9d32d2bdc253ff02f11afcb0ff4cc73cf94467e9cb97ed97ff3a932d15d"},{"algorithm":"SHA1","checksum":"59d31eb1cdf96408f27d6cdedd15d870edbdee71"},{"algorithm":"SHA256","checksum":"b8deecee8f83b45901939ba677ff3161a5faccf0abb591aeff2727a0fc5fefa4"}]},"lines":[4,5],"breakpoints":[{"line":4},{"line":5}],"sourceModified":false},"type":"request","seq":3}
-> (C) {"command":"setFunctionBreakpoints","arguments":{"breakpoints":[]},"type":"request","seq":4}
-> (C) {"command":"setExceptionBreakpoints","arguments":{"filters":[],"filterOptions":[{"filterId":"user-unhandled"}]},"type":"request","seq":5}
<- (E) {"seq":6,"type":"event","event":"output","body":{"category":"telemetry","output":"vs/diagnostics/debugger/vsdbg/BreakpointAdded","data":{"VS.Diagnostics.Debugger.vsdbg.BreakpointAdded.HasCondition":false,"VS.Diagnostics.Debugger.vsdbg.BreakpointAdded.BreakpointType":"Source","VS.Diagnostics.Debugger.vsdbg.AdapterId":"coreclr","VS.Diagnostics.Debugger.vsdbg.BreakpointAdded.HasHitCount":false,"VS.Diagnostics.Debugger.vsdbg.Distribution.Version":"12","VS.Diagnostics.Debugger.vsdbg.BreakpointAdded.HasLogMessage":false,"VS.Diagnostics.Debugger.vsdbg.Distribution.Name":"debian","VS.Diagnostics.Debugger.vsdbg.OSFamily":"Linux","VS.Diagnostics.Debugger.vsdbg.Version":"17.13.20213.2 commit:94f9ba144fac710bef039d59c06d96da171fd332"}}}
<- (E) {"seq":7,"type":"event","event":"output","body":{"category":"telemetry","output":"vs/diagnostics/debugger/vsdbg/BreakpointAdded","data":{"VS.Diagnostics.Debugger.vsdbg.BreakpointAdded.HasCondition":false,"VS.Diagnostics.Debugger.vsdbg.BreakpointAdded.BreakpointType":"Source","VS.Diagnostics.Debugger.vsdbg.AdapterId":"coreclr","VS.Diagnostics.Debugger.vsdbg.BreakpointAdded.HasHitCount":false,"VS.Diagnostics.Debugger.vsdbg.Distribution.Version":"12","VS.Diagnostics.Debugger.vsdbg.BreakpointAdded.HasLogMessage":false,"VS.Diagnostics.Debugger.vsdbg.Distribution.Name":"debian","VS.Diagnostics.Debugger.vsdbg.OSFamily":"Linux","VS.Diagnostics.Debugger.vsdbg.Version":"17.13.20213.2 commit:94f9ba144fac710bef039d59c06d96da171fd332"}}}
<- (R) {"seq":8,"type":"response","request_seq":3,"success":true,"command":"setBreakpoints","body":{"breakpoints":[{"id":1,"verified":false,"message":"The breakpoint is pending and will be resolved when debugging starts.","line":4},{"id":2,"verified":false,"message":"The breakpoint is pending and will be resolved when debugging starts.","line":5}]}}
<- (R) {"seq":9,"type":"response","request_seq":4,"success":true,"command":"setFunctionBreakpoints","body":{"breakpoints":[]}}
<- (R) {"seq":10,"type":"response","request_seq":5,"success":true,"command":"setExceptionBreakpoints","body":{"breakpoints":[{"verified":true}]}}
-> (C) {"command":"configurationDone","type":"request","seq":6}
<- (E) {"seq":11,"type":"event","event":"output","body":{"category":"telemetry","output":"VS/Diagnostics/Debugger/vsdbg/ProcessCreate","data":{"VS.Diagnostics.Debugger.vsdbg.Distribution.Version":"12","VS.Diagnostics.Debugger.vsdbg.TargetArchitecture":"ARM64","VS.Diagnostics.Debugger.vsdbg.Distribution.Name":"debian","VS.Diagnostics.Debugger.vsdbg.OSFamily":"Linux","VS.Diagnostics.Debugger.vsdbg.Version":"17.13.20213.2 commit:94f9ba144fac710bef039d59c06d96da171fd332"}}}
<- (E) {"seq":12,"type":"event","event":"process","body":{"name":"/data/home/pi/debug/App","systemProcessId":4206,"isLocalProcess":false,"startMethod":"launch"}}
<- (E) {"seq":13,"type":"event","event":"breakpoint","body":{"reason":"changed","breakpoint":{"id":1,"verified":false,"message":"No symbols have been loaded for this document.","line":4}}}
<- (E) {"seq":14,"type":"event","event":"breakpoint","body":{"reason":"changed","breakpoint":{"id":2,"verified":false,"message":"No symbols have been loaded for this document.","line":5}}}
<- (R) {"seq":15,"type":"response","request_seq":6,"success":true,"command":"configurationDone"}
-> (C) {"command":"threads","type":"request","seq":7}
<- (R) {"seq":16,"type":"response","request_seq":7,"success":true,"command":"threads","body":{"threads":[]}}
App (4206): Loaded '/opt/Microsoft/dotnet/shared/Microsoft.NETCore.App/8.0.16/System.Private.CoreLib.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
<- (E) {"seq":18,"type":"event","event":"module","body":{"reason":"new","module":{"id":1000,"name":"System.Private.CoreLib.dll","path":"/opt/Microsoft/dotnet/shared/Microsoft.NETCore.App/8.0.16/System.Private.CoreLib.dll","isOptimized":true,"isUserCode":false,"version":"8.00.1625.21506","symbolStatus":"Skipped loading symbols."}}}
<- (E) {"seq":19,"type":"event","event":"thread","body":{"reason":"started","threadId":4206}}
-> (C) {"command":"threads","type":"request","seq":8}
<- (R) {"seq":20,"type":"response","request_seq":8,"success":true,"command":"threads","body":{"threads":[{"id":4206,"name":"Thread #4206"}]}}
App (4206): Loaded '/data/home/pi/debug/App.dll'. Symbols loaded.
<- (E) {"seq":22,"type":"event","event":"module","body":{"reason":"new","module":{"id":1001,"name":"App.dll","path":"/data/home/pi/debug/App.dll","isOptimized":false,"isUserCode":true,"version":"1.00.0.0","symbolStatus":"Symbols loaded.","symbolFilePath":"/data/home/pi/debug/App.pdb"}}}
<- (E) {"seq":23,"type":"event","event":"breakpoint","body":{"reason":"changed","breakpoint":{"id":1,"verified":true,"source":{"name":"Program.cs","path":"C:\\Users\\Mike\\Desktop\\vsdbg_bug\\App\\Program.cs","sourceReference":0,"checksums":[{"algorithm":"SHA256","checksum":"ad92c9d32d2bdc253ff02f11afcb0ff4cc73cf94467e9cb97ed97ff3a932d15d"}]},"line":4,"endLine":4,"offset":0}}}
<- (E) {"seq":24,"type":"event","event":"breakpoint","body":{"reason":"changed","breakpoint":{"id":2,"verified":true,"source":{"name":"Program.cs","path":"C:\\Users\\Mike\\Desktop\\vsdbg_bug\\App\\Program.cs","sourceReference":0,"checksums":[{"algorithm":"SHA256","checksum":"ad92c9d32d2bdc253ff02f11afcb0ff4cc73cf94467e9cb97ed97ff3a932d15d"}]},"line":5,"endLine":5,"offset":0}}}
App (4206): Loaded '/opt/Microsoft/dotnet/shared/Microsoft.NETCore.App/8.0.16/System.Runtime.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
<- (E) {"seq":26,"type":"event","event":"module","body":{"reason":"new","module":{"id":1002,"name":"System.Runtime.dll","path":"/opt/Microsoft/dotnet/shared/Microsoft.NETCore.App/8.0.16/System.Runtime.dll","isOptimized":true,"isUserCode":false,"version":"8.00.1625.21506","symbolStatus":"Skipped loading symbols."}}}
App (4206): Loaded '/opt/Microsoft/dotnet/shared/Microsoft.NETCore.App/8.0.16/System.Console.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
<- (E) {"seq":28,"type":"event","event":"module","body":{"reason":"new","module":{"id":1003,"name":"System.Console.dll","path":"/opt/Microsoft/dotnet/shared/Microsoft.NETCore.App/8.0.16/System.Console.dll","isOptimized":true,"isUserCode":false,"version":"8.00.1625.21506","symbolStatus":"Skipped loading symbols."}}}
<- (E) {"seq":29,"type":"event","event":"breakpoint","body":{"reason":"changed","breakpoint":{"id":1,"verified":true,"source":{"name":"Program.cs","path":"C:\\Users\\Mike\\Desktop\\vsdbg_bug\\App\\Program.cs","sourceReference":0,"checksums":[{"algorithm":"SHA256","checksum":"ad92c9d32d2bdc253ff02f11afcb0ff4cc73cf94467e9cb97ed97ff3a932d15d"}]},"line":4,"endLine":4,"instructionReference":"0x0000007F59CD2258","offset":0}}}
<- (E) {"seq":30,"type":"event","event":"output","body":{"category":"telemetry","output":"VS/Diagnostics/Debugger/vsdbg/Launch","data":{"VS.Diagnostics.Debugger.vsdbg.Launch.DebuggerStartTime":792,"VS.Diagnostics.Debugger.vsdbg.SourceFileMappings":0,"VS.Diagnostics.Debugger.vsdbg.VisualizerFileUsed":false,"VS.Diagnostics.Debugger.vsdbg.TargetType":"Live","VS.Diagnostics.Debugger.vsdbg.TargetCLRVersion":"8.0.1625.21506","VS.Diagnostics.Debugger.vsdbg.AdapterId":"coreclr","VS.Diagnostics.Debugger.vsdbg.Distribution.Version":"12","VS.Diagnostics.Debugger.vsdbg.Distribution.Name":"debian","VS.Diagnostics.Debugger.vsdbg.OSFamily":"Linux","VS.Diagnostics.Debugger.vsdbg.Version":"17.13.20213.2 commit:94f9ba144fac710bef039d59c06d96da171fd332"}}}
<- (E) {"seq":31,"type":"event","event":"stopped","body":{"reason":"breakpoint","threadId":4206,"allThreadsStopped":true,"hitBreakpointIds":[1],"source":{"name":"Program.cs","path":"C:\\Users\\Mike\\Desktop\\vsdbg_bug\\App\\Program.cs"},"line":4,"column":1}}
-> (C) {"command":"threads","type":"request","seq":9}
<- (R) {"seq":32,"type":"response","request_seq":9,"success":true,"command":"threads","body":{"threads":[{"id":4206,"name":"Main Thread"}]}}
-> (C) {"command":"stackTrace","arguments":{"threadId":4206,"startFrame":0,"levels":20},"type":"request","seq":10}
-> (C) {"command":"stackTrace","arguments":{"threadId":4206,"startFrame":0,"levels":20},"type":"request","seq":11}
<- (R) {"seq":33,"type":"response","request_seq":10,"success":true,"command":"stackTrace","body":{"stackFrames":[{"id":1000,"name":"App.dll!Program.<Main>$(string[] args) Line 4","source":{"name":"Program.cs","path":"C:\\Users\\Mike\\Desktop\\vsdbg_bug\\App\\Program.cs","sourceReference":0,"checksums":[{"algorithm":"SHA256","checksum":"ad92c9d32d2bdc253ff02f11afcb0ff4cc73cf94467e9cb97ed97ff3a932d15d"}]},"line":4,"column":1,"endLine":4,"endColumn":24,"instructionPointerReference":"0x0000007F59CD2258","moduleId":1001},{"id":1001,"name":"[External Code]","line":0,"column":0,"presentationHint":"subtle"}],"totalFrames":2}}
<- (R) {"seq":34,"type":"response","request_seq":11,"success":true,"command":"stackTrace","body":{"stackFrames":[{"id":1000,"name":"App.dll!Program.<Main>$(string[] args) Line 4","source":{"name":"Program.cs","path":"C:\\Users\\Mike\\Desktop\\vsdbg_bug\\App\\Program.cs","sourceReference":0,"checksums":[{"algorithm":"SHA256","checksum":"ad92c9d32d2bdc253ff02f11afcb0ff4cc73cf94467e9cb97ed97ff3a932d15d"}]},"line":4,"column":1,"endLine":4,"endColumn":24,"instructionPointerReference":"0x0000007F59CD2258","moduleId":1001},{"id":1002,"name":"[External Code]","line":0,"column":0,"presentationHint":"subtle"}],"totalFrames":2}}
-> (C) {"command":"scopes","arguments":{"frameId":1000},"type":"request","seq":12}
<- (R) {"seq":35,"type":"response","request_seq":12,"success":true,"command":"scopes","body":{"scopes":[{"name":"Locals","variablesReference":1000,"expensive":false}]}}
-> (C) {"command":"variables","arguments":{"variablesReference":1000},"type":"request","seq":13}
<- (R) {"seq":36,"type":"response","request_seq":13,"success":true,"command":"variables","body":{"variables":[{"name":"args [string[]]","value":"{string[0]}","type":"string[]","presentationHint":{"kind":"data","attributes":["canHaveObjectId"],"customUIVisualizers":[{"uiSideVisualizerTypeName":"Microsoft.VisualStudio.Debugger.IEnumerableVisualizer.IEnumerableVisualizer","uiSideVisualizerAssemblyName":"IEnumerableVisualizer.UI, Version=17.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a","debuggeeSideVisualizerTypeName":"Microsoft.VisualStudio.Debugger.IEnumerableVisualizer.IEnumerableVisualizerSource","debuggeeSideVisualizerAssemblyName":"IEnumerableVisualizer.DebuggeeSide, Version=17.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a","id":0,"menuName":"IEnumerable Visualizer","description":"IEnumerable Visualizer"}]},"evaluateName":"args","variablesReference":0,"memoryReference":"0x0000001593008B18"},{"name":"result [int]","value":"0","type":"int","presentationHint":{"kind":"data"},"evaluateName":"result","variablesReference":0,"memoryReference":"0x0000000000000000"}]}}
-> (C) {"command":"next","arguments":{"threadId":4206},"type":"request","seq":14}
<- (E) {"seq":37,"type":"event","event":"continued","body":{"threadId":4206,"allThreadsContinued":true}}
<- (R) {"seq":38,"type":"response","request_seq":14,"success":true,"command":"next"}
<- (E) {"seq":39,"type":"event","event":"output","body":{"category":"telemetry","output":"VS/Diagnostics/Debugger/MetaDataMemoryUsage","data":{"VS.Diagnostics.Debugger.TotalBytes":2754524.0,"VS.Diagnostics.Debugger.AdditionalModuleCount":0,"VS.Diagnostics.Debugger.vsdbg.TargetCLRVersion":"8.0.1625.21506","VS.Diagnostics.Debugger.TotalModuleCount":4,"VS.Diagnostics.Debugger.vsdbg.Distribution.Version":"12","VS.Diagnostics.Debugger.vsdbg.Distribution.Name":"debian","VS.Diagnostics.Debugger.vsdbg.OSFamily":"Linux","VS.Diagnostics.Debugger.vsdbg.Version":"17.13.20213.2 commit:94f9ba144fac710bef039d59c06d96da171fd332"}}}
<- (E) {"seq":40,"type":"event","event":"output","body":{"category":"telemetry","output":"VS/Diagnostics/Debugger/IncompleteStep","data":{"VS.Diagnostics.Debugger.vsdbg.TargetCLRVersion":"8.0.1625.21506","VS.Diagnostics.Debugger.vsdbg.Distribution.Version":"12","VS.Diagnostics.Debugger.vsdbg.Distribution.Name":"debian","VS.Diagnostics.Debugger.vsdbg.OSFamily":"Linux","VS.Diagnostics.Debugger.vsdbg.Version":"17.13.20213.2 commit:94f9ba144fac710bef039d59c06d96da171fd332"}}}
<- (E) {"seq":41,"type":"event","event":"output","body":{"category":"telemetry","output":"VS/Diagnostics/Debugger/ExpressionEvaluator/DebugSessionEnded","data":{"VS.Diagnostics.Debugger.ExpressionEvaluator.FastExecuteDisabledCount.ExecutionException":0,"VS.Diagnostics.Debugger.ExpressionEvaluator.FastExecuteDisabledCount.BackwardBranchEncountered":0,"VS.Diagnostics.Debugger.ExpressionEvaluator.FastExecuteDisabledCount.MaxStackHeightExceeded":0,"VS.Diagnostics.Debugger.ExpressionEvaluator.FastExecuteDisabledCount.DecodeException":0,"VS.Diagnostics.Debugger.ExpressionEvaluator.FastExecuteDisabledCount.ExceptionClauses":0,"VS.Diagnostics.Debugger.ExpressionEvaluator.FastExecuteDisabledCount.None":0,"VS.Diagnostics.Debugger.ExpressionEvaluator.LINQ.count":0.0,"VS.Diagnostics.Debugger.vsdbg.Version":"17.13.20213.2 commit:94f9ba144fac710bef039d59c06d96da171fd332","VS.Diagnostics.Debugger.ExpressionEvaluator.ClrVersion":"8.0.1625.21506","VS.Diagnostics.Debugger.ExpressionEvaluator.SuccessCount":2.0,"VS.Diagnostics.Debugger.ExpressionEvaluator.FastExecuteDisabledCount.IlLength":0,"VS.Diagnostics.Debugger.vsdbg.OSFamily":"Linux","VS.Diagnostics.Debugger.vsdbg.Distribution.Name":"debian","VS.Diagnostics.Debugger.vsdbg.Distribution.Version":"12","VS.Diagnostics.Debugger.ExpressionEvaluator.SlowestFastExecuteTimeInMs":0.0,"VS.Diagnostics.Debugger.vsdbg.TargetCLRVersion":"8.0.1625.21506","VS.Diagnostics.Debugger.ExpressionEvaluator.GetPropertyValueCount":0,"VS.Diagnostics.Debugger.ExpressionEvaluator.FastExecuteSuccessCount":0,"VS.Diagnostics.Debugger.ExpressionEvaluator.FastExecuteAttemptCount":0,"VS.Diagnostics.Debugger.ExpressionEvaluator.TotalFastExecuteTimeInMs":0.0,"VS.Diagnostics.Debugger.ExpressionEvaluator.FailCount":0.0}}}
<- (E) {"seq":42,"type":"event","event":"output","body":{"category":"telemetry","output":"VS/Diagnostics/Debugger/vsdbg/ProcessExit","data":{"VS.Diagnostics.Debugger.vsdbg.ProcessExit.StdInWrittenTo":false,"VS.Diagnostics.Debugger.vsdbg.ProcessExit.StdInReadFrom":false,"VS.Diagnostics.Debugger.vsdbg.TargetCLRVersion":"8.0.1625.21506","VS.Diagnostics.Debugger.vsdbg.AdapterId":"coreclr","VS.Diagnostics.Debugger.vsdbg.Distribution.Version":"12","VS.Diagnostics.Debugger.vsdbg.Distribution.Name":"debian","VS.Diagnostics.Debugger.vsdbg.OSFamily":"Linux","VS.Diagnostics.Debugger.vsdbg.Version":"17.13.20213.2 commit:94f9ba144fac710bef039d59c06d96da171fd332"}}}
The program '[4206] App' has exited with code 0 (0x0).
<- (E) {"seq":44,"type":"event","event":"exited","body":{"exitCode":0}}
<- (E) {"seq":45,"type":"event","event":"terminated","body":{}}
-> (C) {"command":"disconnect","arguments":{"restart":false,"terminateDebuggee":false},"type":"request","seq":15}
<- (E) {"seq":46,"type":"event","event":"output","body":{"category":"telemetry","output":"VS/Diagnostics/Debugger/vsdbg/DebugCompleted","data":{"VS.Diagnostics.Debugger.vsdbg.DebugCompleted.BreakCounter":1,"VS.Diagnostics.Debugger.vsdbg.TargetCLRVersion":"8.0.1625.21506","VS.Diagnostics.Debugger.vsdbg.AdapterId":"coreclr","VS.Diagnostics.Debugger.vsdbg.Distribution.Version":"12","VS.Diagnostics.Debugger.vsdbg.Distribution.Name":"debian","VS.Diagnostics.Debugger.vsdbg.OSFamily":"Linux","VS.Diagnostics.Debugger.vsdbg.Version":"17.13.20213.2 commit:94f9ba144fac710bef039d59c06d96da171fd332"}}}
<- (R) {"seq":47,"type":"response","request_seq":15,"success":true,"command":"disconnect"}

Environment information

VSCode version: 1.100.2
C# Extension: 2.76.27
Using OmniSharp: true

Dotnet Information

.NET SDK: Version: 10.0.100-preview.4.25258.110 Commit: c22dcd0c7a Workload version: 10.0.100-manifests.e9b6aa6e MSBuild version: 17.15.0-preview-25258-110+c22dcd0c7

Runtime Environment:
OS Name: Windows
OS Version: 10.0.26100
OS Platform: Windows
RID: win-x64
Base Path: C:\Program Files\dotnet\sdk\10.0.100-preview.4.25258.110\

.NET workloads installed:
[wasm-tools]
Installation Source: VS 17.14.36121.58
Manifest Version: 10.0.100-preview.4.25258.110/10.0.100-preview.4
Manifest Path: C:\Program Files\dotnet\sdk-manifests\10.0.100-preview.4\microsoft.net.workload.mono.toolchain.current\10.0.100-preview.4.25258.110\WorkloadManifest.json
Install Type: Msi

[maccatalyst]
Installation Source: VS 17.14.36121.58
Manifest Version: 18.2.10695-net10-p3/10.0.100-preview.3
Manifest Path: C:\Program Files\dotnet\sdk-manifests\10.0.100-preview.3\microsoft.net.sdk.maccatalyst\18.2.10695-net10-p3\WorkloadManifest.json
Install Type: Msi

[ios]
Installation Source: VS 17.14.36121.58
Manifest Version: 18.2.10695-net10-p3/10.0.100-preview.3
Manifest Path: C:\Program Files\dotnet\sdk-manifests\10.0.100-preview.3\microsoft.net.sdk.ios\18.2.10695-net10-p3\WorkloadManifest.json
Install Type: Msi

[maui-windows]
Installation Source: VS 17.14.36121.58
Manifest Version: 10.0.0-preview.3.25208.1/10.0.100-preview.3
Manifest Path: C:\Program Files\dotnet\sdk-manifests\10.0.100-preview.3\microsoft.net.sdk.maui\10.0.0-preview.3.25208.1\WorkloadManifest.json
Install Type: Msi

[android]
Installation Source: VS 17.14.36121.58
Manifest Version: 36.0.0-preview.3.22/10.0.100-preview.3
Manifest Path: C:\Program Files\dotnet\sdk-manifests\10.0.100-preview.3\microsoft.net.sdk.android\36.0.0-preview.3.22\WorkloadManifest.json
Install Type: Msi

Configured to use workload sets when installing new manifests.
Workloads are configured to install and update using workload versions, but none were found. Run "dotnet workload restore" to install a workload version.

Host:
Version: 10.0.0-preview.4.25258.110
Architecture: x64
Commit: c22dcd0c7a

.NET SDKs installed:
8.0.303 [C:\Program Files\dotnet\sdk]
9.0.100 [C:\Program Files\dotnet\sdk]
9.0.300 [C:\Program Files\dotnet\sdk]
10.0.100-preview.4.25258.110 [C:\Program Files\dotnet\sdk]

.NET runtimes installed:
Microsoft.AspNetCore.App 6.0.36 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 7.0.20 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 8.0.7 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 8.0.16 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 9.0.0 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 9.0.5 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 10.0.0-preview.4.25258.110 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.NETCore.App 6.0.36 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 7.0.20 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 8.0.7 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 8.0.10 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 8.0.14 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 8.0.16 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 9.0.0 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 9.0.5 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 10.0.0-preview.4.25258.110 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.WindowsDesktop.App 6.0.36 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
Microsoft.WindowsDesktop.App 7.0.20 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
Microsoft.WindowsDesktop.App 8.0.7 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
Microsoft.WindowsDesktop.App 8.0.10 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
Microsoft.WindowsDesktop.App 8.0.16 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
Microsoft.WindowsDesktop.App 9.0.0 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
Microsoft.WindowsDesktop.App 9.0.5 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
Microsoft.WindowsDesktop.App 10.0.0-preview.4.25258.110 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]

Other architectures found:
x86 [C:\Program Files (x86)\dotnet]
registered at [HKLM\SOFTWARE\dotnet\Setup\InstalledVersions\x86\InstallLocation]

Environment variables:
Not set

global.json file:
Not found

Extension	Author	Version	Folder Name
blazorwasm-companion	ms-dotnettools	1.1.4	ms-dotnettools.blazorwasm-companion-1.1.4
cmake-tools	ms-vscode	1.20.53	ms-vscode.cmake-tools-1.20.53
copilot	GitHub	1.325.0	github.copilot-1.325.0
copilot-chat	GitHub	0.27.2	github.copilot-chat-0.27.2
cortex-debug	marus25	1.12.1	marus25.cortex-debug-1.12.1
cpptools	ms-vscode	1.25.3	ms-vscode.cpptools-1.25.3-win32-x64
cpptools-extension-pack	ms-vscode	1.3.1	ms-vscode.cpptools-extension-pack-1.3.1
cpptools-themes	ms-vscode	2.0.0	ms-vscode.cpptools-themes-2.0.0
csharp	ms-dotnettools	2.76.27	ms-dotnettools.csharp-2.76.27-win32-x64
debug-tracker-vscode	mcu-debug	0.0.15	mcu-debug.debug-tracker-vscode-0.0.15
debugpy	ms-python	2025.8.0	ms-python.debugpy-2025.8.0-win32-x64
memory-view	mcu-debug	0.0.25	mcu-debug.memory-view-0.0.25
mono-debug	ms-vscode	0.16.3	ms-vscode.mono-debug-0.16.3
peripheral-viewer	mcu-debug	1.4.6	mcu-debug.peripheral-viewer-1.4.6
pico-w-go	paulober	4.2.2	paulober.pico-w-go-4.2.2-win32-x64
python	ms-python	2025.6.1	ms-python.python-2025.6.1-win32-x64
raspberry-pi-pico	raspberry-pi	0.17.5	raspberry-pi.raspberry-pi-pico-0.17.5
remote-containers	ms-vscode-remote	0.413.0	ms-vscode-remote.remote-containers-0.413.0
remote-explorer	ms-vscode	0.5.0	ms-vscode.remote-explorer-0.5.0
remote-server	ms-vscode	1.5.2	ms-vscode.remote-server-1.5.2
remote-ssh	ms-vscode-remote	0.120.0	ms-vscode-remote.remote-ssh-0.120.0
remote-ssh-edit	ms-vscode-remote	0.87.0	ms-vscode-remote.remote-ssh-edit-0.87.0
remote-wsl	ms-vscode-remote	0.99.0	ms-vscode-remote.remote-wsl-0.99.0
rtos-views	mcu-debug	0.0.7	mcu-debug.rtos-views-0.0.7
vscode-dotnet-runtime	ms-dotnettools	2.3.5	ms-dotnettools.vscode-dotnet-runtime-2.3.5
vscode-pylance	ms-python	2025.5.1	ms-python.vscode-pylance-2025.5.1
vscode-remote-extensionpack	ms-vscode-remote	0.26.0	ms-vscode-remote.vscode-remote-extensionpack-0.26.0
vscode-serial-monitor	ms-vscode	0.13.1	ms-vscode.vscode-serial-monitor-0.13.1

Extension version: 2.76.27
VS Code version: Code 1.100.2 (848b80aeb52026648a8ff9f7c45a9b0a80641e2e, 2025-05-14T21:47:40.416Z)
OS version: Windows_NT x64 10.0.26100
Modes:

System Info

Item	Value
CPUs	13th Gen Intel(R) Core(TM) i9-13900K (32 x 2995)
GPU Status	2d_canvas: enabled canvas_oop_rasterization: enabled_on direct_rendering_display_compositor: disabled_off_ok gpu_compositing: enabled multiple_raster_threads: enabled_on opengl: enabled_on rasterization: enabled raw_draw: disabled_off_ok skia_graphite: disabled_off video_decode: enabled video_encode: enabled vulkan: disabled_off webgl: enabled webgl2: enabled webgpu: enabled webnn: disabled_off
Load (avg)	undefined
Memory (System)	31.77GB (11.82GB free)
Process Argv	. --crash-reporter-id 5cfd0d83-d651-4bdc-b7d5-a2b091cb5dd3
Screen Reader	no
VM	0%

A/B Experiments

vsliv368cf:30146710
vspor879:30202332
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vspor363:30204092
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c4g48928:30535728
azure-dev_surveyonecf:30548226
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pythontbext0:30879054
cppperfnew:31000557
dwnewjupyter:31046869
pythonrstrctxt:31112756
nativeloc2:31192216
5fd0e150:31155592
dwcopilot:31170013
6074i472:31201624
dwoutputs:31242946
customenabled:31248079
hdaa2157:31222309
copilot_t_ci:31222730
e5gg6876:31282496
pythoneinst12:31285622
bgtreat:31268568
4gafe986:31271826
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pythonrdcb7:31303018
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pylancecolor:31314202
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convertfstringf:31295003
gendocf:31295004

[gregg-miskelly]

This is an interesting one. What is almost certainly going on is that there is some sort of problem in the .NET Runtime -- specifically the portion that runs inside the target process to support debugging. Unfortunately, that code is tricky to debug and we don't have a lot to go on.

A few questions:

1. If you add a Console.ReadLine before the call to Add, and then attach instead of launching, do you still see the problem? If so, is any additional information printed to the terminal? Ideally, the target process is crashing and with the correct settings we can get Linux to write out a core dump to tell us where.
2. Do you see the problem if you target .NET 9 instead of .NET 8?
3. This probably will not help, but can you try using the following logging settings and we can see if the .NET debugging services send any sort of interesting event before the process exits?

Logging settings to try:

            "logging": {
                "diagnosticsLog": {
                    "debugRuntimeEventTracing": true
                }
            }

[JinShil]

3. This probably will not help, but can you try using the following logging settings and we can see if the .NET debugging services send any sort of interesting event before the process exits?

I enabled the logging settings you suggested, set a breakpoint at the Add function. When the breakpoint was hit, I cleared the Debug Console to keep the log relevant to what happens when the Add function is called, and this is what I see right after attempting to step over the Add function:

-> (C) {"command":"next","arguments":{"threadId":2455},"type":"request","seq":14}
-> (C) {"command":"next","arguments":{"threadId":2455},"type":"request","seq":14}
<- (E) {"seq":57,"type":"event","event":"continued","body":{"threadId":2455,"allThreadsContinued":true}}
<- (R) {"seq":58,"type":"response","request_seq":14,"success":true,"command":"next"}
[Debug Runtime Event] DBI Callback -- ExitThread(AppDomain:0000003E90000D98, Thread:0000003E84014E48)
[Debug Runtime Event] DBI Callback -- ExitProcess(Process:0000003E8400C128)
<- (E) {"seq":61,"type":"event","event":"output","body":{"category":"telemetry","output":"VS/Diagnostics/Debugger/MetaDataMemoryUsage","data":{"VS.Diagnostics.Debugger.TotalBytes":2754596.0,"VS.Diagnostics.Debugger.AdditionalModuleCount":0,"VS.Diagnostics.Debugger.vsdbg.TargetCLRVersion":"8.0.1625.21506","VS.Diagnostics.Debugger.TotalModuleCount":4,"VS.Diagnostics.Debugger.vsdbg.Distribution.Version":"12","VS.Diagnostics.Debugger.vsdbg.Distribution.Name":"debian","VS.Diagnostics.Debugger.vsdbg.OSFamily":"Linux","VS.Diagnostics.Debugger.vsdbg.Version":"17.13.20213.2 commit:94f9ba144fac710bef039d59c06d96da171fd332"}}}
[Important] Process App (2455) exited with a stepper still active
<- (E) {"seq":63,"type":"event","event":"output","body":{"category":"telemetry","output":"VS/Diagnostics/Debugger/IncompleteStep","data":{"VS.Diagnostics.Debugger.vsdbg.TargetCLRVersion":"8.0.1625.21506","VS.Diagnostics.Debugger.vsdbg.Distribution.Version":"12","VS.Diagnostics.Debugger.vsdbg.Distribution.Name":"debian","VS.Diagnostics.Debugger.vsdbg.OSFamily":"Linux","VS.Diagnostics.Debugger.vsdbg.Version":"17.13.20213.2 commit:94f9ba144fac710bef039d59c06d96da171fd332"}}}
<- (E) {"seq":64,"type":"event","event":"output","body":{"category":"telemetry","output":"VS/Diagnostics/Debugger/ExpressionEvaluator/DebugSessionEnded","data":{"VS.Diagnostics.Debugger.ExpressionEvaluator.FastExecuteDisabledCount.ExecutionException":0,"VS.Diagnostics.Debugger.ExpressionEvaluator.FastExecuteDisabledCount.BackwardBranchEncountered":0,"VS.Diagnostics.Debugger.ExpressionEvaluator.FastExecuteDisabledCount.MaxStackHeightExceeded":0,"VS.Diagnostics.Debugger.ExpressionEvaluator.FastExecuteDisabledCount.DecodeException":0,"VS.Diagnostics.Debugger.ExpressionEvaluator.FastExecuteDisabledCount.ExceptionClauses":0,"VS.Diagnostics.Debugger.ExpressionEvaluator.FastExecuteDisabledCount.None":0,"VS.Diagnostics.Debugger.ExpressionEvaluator.LINQ.count":0.0,"VS.Diagnostics.Debugger.vsdbg.Version":"17.13.20213.2 commit:94f9ba144fac710bef039d59c06d96da171fd332","VS.Diagnostics.Debugger.ExpressionEvaluator.ClrVersion":"8.0.1625.21506","VS.Diagnostics.Debugger.ExpressionEvaluator.SuccessCount":2.0,"VS.Diagnostics.Debugger.ExpressionEvaluator.FastExecuteDisabledCount.IlLength":0,"VS.Diagnostics.Debugger.vsdbg.OSFamily":"Linux","VS.Diagnostics.Debugger.vsdbg.Distribution.Name":"debian","VS.Diagnostics.Debugger.vsdbg.Distribution.Version":"12","VS.Diagnostics.Debugger.ExpressionEvaluator.SlowestFastExecuteTimeInMs":0.0,"VS.Diagnostics.Debugger.vsdbg.TargetCLRVersion":"8.0.1625.21506","VS.Diagnostics.Debugger.ExpressionEvaluator.GetPropertyValueCount":0,"VS.Diagnostics.Debugger.ExpressionEvaluator.FastExecuteSuccessCount":0,"VS.Diagnostics.Debugger.ExpressionEvaluator.FastExecuteAttemptCount":0,"VS.Diagnostics.Debugger.ExpressionEvaluator.TotalFastExecuteTimeInMs":0.0,"VS.Diagnostics.Debugger.ExpressionEvaluator.FailCount":0.0}}}
<- (E) {"seq":65,"type":"event","event":"output","body":{"category":"telemetry","output":"VS/Diagnostics/Debugger/vsdbg/ProcessExit","data":{"VS.Diagnostics.Debugger.vsdbg.ProcessExit.StdInWrittenTo":false,"VS.Diagnostics.Debugger.vsdbg.ProcessExit.StdInReadFrom":false,"VS.Diagnostics.Debugger.vsdbg.TargetCLRVersion":"8.0.1625.21506","VS.Diagnostics.Debugger.vsdbg.AdapterId":"coreclr","VS.Diagnostics.Debugger.vsdbg.Distribution.Version":"12","VS.Diagnostics.Debugger.vsdbg.Distribution.Name":"debian","VS.Diagnostics.Debugger.vsdbg.OSFamily":"Linux","VS.Diagnostics.Debugger.vsdbg.Version":"17.13.20213.2 commit:94f9ba144fac710bef039d59c06d96da171fd332"}}}
The program '[2455] App' has exited with code 0 (0x0).
<- (E) {"seq":67,"type":"event","event":"exited","body":{"exitCode":0}}
<- (E) {"seq":68,"type":"event","event":"terminated","body":{}}
-> (C) {"command":"disconnect","arguments":{"restart":false,"terminateDebuggee":false},"type":"request","seq":15}
<- (E) {"seq":69,"type":"event","event":"output","body":{"category":"telemetry","output":"VS/Diagnostics/Debugger/vsdbg/DebugCompleted","data":{"VS.Diagnostics.Debugger.vsdbg.DebugCompleted.BreakCounter":1,"VS.Diagnostics.Debugger.vsdbg.TargetCLRVersion":"8.0.1625.21506","VS.Diagnostics.Debugger.vsdbg.AdapterId":"coreclr","VS.Diagnostics.Debugger.vsdbg.Distribution.Version":"12","VS.Diagnostics.Debugger.vsdbg.Distribution.Name":"debian","VS.Diagnostics.Debugger.vsdbg.OSFamily":"Linux","VS.Diagnostics.Debugger.vsdbg.Version":"17.13.20213.2 commit:94f9ba144fac710bef039d59c06d96da171fd332"}}}
<- (R) {"seq":70,"type":"response","request_seq":15,"success":true,"command":"disconnect"}

[JinShil]

2. Do you see the problem if you target .NET 9 instead of .NET 8?

I installed the latest .NET 9 SDK to the ARM64 Linux device, and set the TargetFramework of both the library and the application to net9.0, and tested again. Unfortunately, the behavior is the same as that of .NET 8.

[JinShil]

1. If you add a Console.ReadLine before the call to Add, and then attach instead of launching, do you still see the problem? If so, is any additional information printed to the terminal? Ideally, the target process is crashing and with the correct settings we can get Linux to write out a core dump to tell us where.

Interesting! If I do that, everything works fine. Here's the Debug Console output up to and including stepping over Add.

Starting: "ssh" -T pi@192.168.0.10 "/opt/Microsoft/vsdbg/vsdbg --interpreter=vscode"
-> (C) {"command":"initialize","arguments":{"clientID":"vscode","clientName":"Visual Studio Code","adapterID":"coreclr","pathFormat":"path","linesStartAt1":true,"columnsStartAt1":true,"supportsVariableType":true,"supportsVariablePaging":true,"supportsRunInTerminalRequest":true,"locale":"en","supportsProgressReporting":true,"supportsInvalidatedEvent":true,"supportsMemoryReferences":true,"supportsArgsCanBeInterpretedByShell":true,"supportsMemoryEvent":true,"supportsStartDebuggingRequest":true,"supportsANSIStyling":true},"type":"request","seq":1}
ServiceBroker Start: 0 : Requesting proxy to "Microsoft.VisualStudio.Debugger.ManagedEditAndContinueRemoteDebuggerService2 (0.1)"
ServiceBroker Transfer: 0 : Transfer, relatedActivityId=e0bcfe03-1168-4159-902f-2fc0fb74a718
ServiceBroker Start: 0 : Requesting pipe to "Microsoft.VisualStudio.Server.IBrokeredServiceBridgeManifest (0.1)"
ServiceBroker Stop: 0 : Requesting pipe to "Microsoft.VisualStudio.Server.IBrokeredServiceBridgeManifest (0.1)"
ServiceBroker Transfer: 0 : Transfer, relatedActivityId=6736316b-9f4a-4249-a053-fe8dd30b6019
ServiceBroker Stop: 0 : Requesting proxy to "Microsoft.VisualStudio.Debugger.ManagedEditAndContinueRemoteDebuggerService2 (0.1)"
Error from pipe program 'ssh': Warning: Permanently added '192.168.0.10' (ED25519) to the list of known hosts.
-> (C) {"command":"attach","arguments":{"name":"Remote Debug","type":"coreclr","request":"attach","processName":"App","pipeTransport":{"pipeCwd":"C:\\Users\\Mike\\Desktop\\vsdbg_bug","pipeProgram":"ssh","pipeArgs":["-T","pi@192.168.0.10"],"debuggerPath":"/opt/Microsoft/vsdbg/vsdbg"},"logging":{"moduleLoad":true,"trace":true,"exceptions":true,"engineLogging":false,"diagnosticsLog":{"debugRuntimeEventTracing":true}},"__configurationTarget":6,"hotReloadOnSave":true,"hotReloadVerbosity":"minimal","stopAtEntry":false,"justMyCode":true,"requireExactSource":true,"enableStepFiltering":true,"suppressJITOptimizations":false,"symbolOptions":{"searchPaths":[],"searchMicrosoftSymbolServer":false,"searchNuGetOrgSymbolServer":false,"cachePath":"","moduleFilter":{"mode":"loadAllButExcluded","excludedModules":[],"includedModules":[],"includeSymbolsNextToModules":true,"includeSymbolsOnDemand":true}},"expressionEvaluationOptions":{"allowImplicitFuncEval":true,"allowToString":true,"allowFastEvaluate":true,"showRawValues":false},"__sessionId":"8e79a63f-56e4-4ee1-9bc6-d584e4f441aa"},"type":"request","seq":2}
------------------------------------------------------------------------------
You may only use the Microsoft Visual Studio .NET/C/C++ Debugger (vsdbg) with
Visual Studio Code, Visual Studio or Visual Studio for Mac software to help you
develop and test your applications.
------------------------------------------------------------------------------
<- (R) {"seq":4,"type":"response","request_seq":2,"success":true,"command":"attach"}
<- (E) {"seq":5,"type":"event","event":"initialized","body":{}}
-> (C) {"command":"setBreakpoints","arguments":{"source":{"name":"Program.cs","path":"c:\\Users\\Mike\\Desktop\\vsdbg_bug\\App\\Program.cs","checksums":[{"algorithm":"SHA1","checksum":"1d8cc3fa3de7fa83930147c1d02b09e9e277a4b0"},{"algorithm":"SHA256","checksum":"0c05fd4a2d5d8f48845d45948cad41e74a3e37ddfc68a57f2115a632279116f4"},{"algorithm":"SHA1","checksum":"30cc9a8b1e1427483e90b17f487505311a8b825e"},{"algorithm":"SHA256","checksum":"915c11eaf6c0dbe9ece6c847fe62aacaf91f1978f91a7790963221a84454e057"}]},"lines":[6,7],"breakpoints":[{"line":6},{"line":7}],"sourceModified":false},"type":"request","seq":3}
-> (C) {"command":"setFunctionBreakpoints","arguments":{"breakpoints":[]},"type":"request","seq":4}
-> (C) {"command":"setExceptionBreakpoints","arguments":{"filters":[],"filterOptions":[{"filterId":"user-unhandled"}]},"type":"request","seq":5}
<- (E) {"seq":6,"type":"event","event":"output","body":{"category":"telemetry","output":"vs/diagnostics/debugger/vsdbg/BreakpointAdded","data":{"VS.Diagnostics.Debugger.vsdbg.BreakpointAdded.HasCondition":false,"VS.Diagnostics.Debugger.vsdbg.BreakpointAdded.BreakpointType":"Source","VS.Diagnostics.Debugger.vsdbg.AdapterId":"coreclr","VS.Diagnostics.Debugger.vsdbg.BreakpointAdded.HasHitCount":false,"VS.Diagnostics.Debugger.vsdbg.Distribution.Version":"12","VS.Diagnostics.Debugger.vsdbg.BreakpointAdded.HasLogMessage":false,"VS.Diagnostics.Debugger.vsdbg.Distribution.Name":"debian","VS.Diagnostics.Debugger.vsdbg.OSFamily":"Linux","VS.Diagnostics.Debugger.vsdbg.Version":"17.13.20213.2 commit:94f9ba144fac710bef039d59c06d96da171fd332"}}}
<- (E) {"seq":7,"type":"event","event":"output","body":{"category":"telemetry","output":"vs/diagnostics/debugger/vsdbg/BreakpointAdded","data":{"VS.Diagnostics.Debugger.vsdbg.BreakpointAdded.HasCondition":false,"VS.Diagnostics.Debugger.vsdbg.BreakpointAdded.BreakpointType":"Source","VS.Diagnostics.Debugger.vsdbg.AdapterId":"coreclr","VS.Diagnostics.Debugger.vsdbg.BreakpointAdded.HasHitCount":false,"VS.Diagnostics.Debugger.vsdbg.Distribution.Version":"12","VS.Diagnostics.Debugger.vsdbg.BreakpointAdded.HasLogMessage":false,"VS.Diagnostics.Debugger.vsdbg.Distribution.Name":"debian","VS.Diagnostics.Debugger.vsdbg.OSFamily":"Linux","VS.Diagnostics.Debugger.vsdbg.Version":"17.13.20213.2 commit:94f9ba144fac710bef039d59c06d96da171fd332"}}}
<- (R) {"seq":8,"type":"response","request_seq":3,"success":true,"command":"setBreakpoints","body":{"breakpoints":[{"id":1,"verified":false,"message":"The breakpoint is pending and will be resolved when debugging starts.","line":6},{"id":2,"verified":false,"message":"The breakpoint is pending and will be resolved when debugging starts.","line":7}]}}
<- (R) {"seq":9,"type":"response","request_seq":4,"success":true,"command":"setFunctionBreakpoints","body":{"breakpoints":[]}}
<- (R) {"seq":10,"type":"response","request_seq":5,"success":true,"command":"setExceptionBreakpoints","body":{"breakpoints":[{"verified":true}]}}
-> (C) {"command":"configurationDone","type":"request","seq":6}
<- (E) {"seq":11,"type":"event","event":"output","body":{"category":"telemetry","output":"VS/Diagnostics/Debugger/vsdbg/ProcessCreate","data":{"VS.Diagnostics.Debugger.vsdbg.Distribution.Version":"12","VS.Diagnostics.Debugger.vsdbg.TargetArchitecture":"ARM64","VS.Diagnostics.Debugger.vsdbg.Distribution.Name":"debian","VS.Diagnostics.Debugger.vsdbg.OSFamily":"Linux","VS.Diagnostics.Debugger.vsdbg.Version":"17.13.20213.2 commit:94f9ba144fac710bef039d59c06d96da171fd332"}}}
<- (E) {"seq":12,"type":"event","event":"process","body":{"name":"/data/home/pi/debug/App","systemProcessId":4603,"isLocalProcess":false,"startMethod":"attach"}}
ServiceBroker Start: 0 : Requesting proxy to "Microsoft.VisualStudio.Debugger.ManagedEditAndContinueCsDevKitEngineService2 (0.1)"
[Debug Runtime Event] DBI Callback -- CreateProcess(Process:0000003E8C00C128)
[Debug Runtime Event] DBI Callback -- CreateAppDomain(Process:0000003E8C00C128, AppDomain:0000003E88000D98)
ServiceBroker Stop: 0 : Requesting proxy to "Microsoft.VisualStudio.Debugger.ManagedEditAndContinueCsDevKitEngineService2 (0.1)"
<- (R) {"seq":15,"type":"response","request_seq":6,"success":true,"command":"configurationDone"}
<- (E) {"seq":16,"type":"event","event":"breakpoint","body":{"reason":"changed","breakpoint":{"id":1,"verified":false,"message":"No symbols have been loaded for this document.","line":6}}}
<- (E) {"seq":17,"type":"event","event":"breakpoint","body":{"reason":"changed","breakpoint":{"id":2,"verified":false,"message":"No symbols have been loaded for this document.","line":7}}}
-> (C) {"command":"threads","type":"request","seq":7}
[Debug Runtime Event] DBI Callback -- LoadAssembly(AppDomain:0000003E88000D98, Assembly:0000003E88001338)
[Debug Runtime Event] DBI Callback -- LoadModule(AppDomain:0000003E88000D98, Module:0000003E88002828)
<- (R) {"seq":20,"type":"response","request_seq":7,"success":true,"command":"threads","body":{"threads":[]}}
[Debug Runtime Event] DBI Callback -- LoadAssembly(AppDomain:0000003E88000D98, Assembly:0000003E880014B8)
[Debug Runtime Event] DBI Callback -- LoadModule(AppDomain:0000003E88000D98, Module:0000003E88002378)
[Debug Runtime Event] DBI Callback -- LoadAssembly(AppDomain:0000003E88000D98, Assembly:0000003E88001528)
[Debug Runtime Event] DBI Callback -- LoadModule(AppDomain:0000003E88000D98, Module:0000003E880019B8)
[Debug Runtime Event] DBI Callback -- LoadAssembly(AppDomain:0000003E88000D98, Assembly:0000003E88001598)
[Debug Runtime Event] DBI Callback -- LoadModule(AppDomain:0000003E88000D98, Module:0000003E88001EC8)
[Debug Runtime Event] DBI Callback -- LoadAssembly(AppDomain:0000003E88000D98, Assembly:0000003E88001608)
[Debug Runtime Event] DBI Callback -- LoadModule(AppDomain:0000003E88000D98, Module:0000003E880021E8)
[Debug Runtime Event] DBI Callback -- LoadAssembly(AppDomain:0000003E88000D98, Assembly:0000003E88001678)
[Debug Runtime Event] DBI Callback -- LoadModule(AppDomain:0000003E88000D98, Module:0000003E88002508)
[Debug Runtime Event] DBI Callback -- LoadAssembly(AppDomain:0000003E88000D98, Assembly:0000003E880016E8)
[Debug Runtime Event] DBI Callback -- LoadModule(AppDomain:0000003E88000D98, Module:0000003E88002058)
[Debug Runtime Event] DBI Callback -- LoadAssembly(AppDomain:0000003E88000D98, Assembly:0000003E88001758)
[Debug Runtime Event] DBI Callback -- LoadModule(AppDomain:0000003E88000D98, Module:0000003E88001D38)
[Debug Runtime Event] DBI Callback -- LoadAssembly(AppDomain:0000003E88000D98, Assembly:0000003E880017C8)
[Debug Runtime Event] DBI Callback -- LoadModule(AppDomain:0000003E88000D98, Module:0000003E88002698)
[Debug Runtime Event] DBI Callback -- CreateThread(AppDomain:0000003E88000D98, Thread:0000003E88003B68)
[Debug Runtime Event] DBI Callback -- CreateThread(AppDomain:0000003E88000D98, Thread:0000003E88003818)
App (4603): Loaded '/opt/Microsoft/dotnet/shared/Microsoft.NETCore.App/8.0.16/System.Private.CoreLib.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
<- (E) {"seq":40,"type":"event","event":"module","body":{"reason":"new","module":{"id":1000,"name":"System.Private.CoreLib.dll","path":"/opt/Microsoft/dotnet/shared/Microsoft.NETCore.App/8.0.16/System.Private.CoreLib.dll","isOptimized":true,"isUserCode":false,"version":"8.00.1625.21506","symbolStatus":"Skipped loading symbols."}}}
App (4603): Loaded '/data/home/pi/debug/App.dll'. Symbols loaded.
<- (E) {"seq":42,"type":"event","event":"module","body":{"reason":"new","module":{"id":1001,"name":"App.dll","path":"/data/home/pi/debug/App.dll","isOptimized":false,"isUserCode":true,"version":"1.00.0.0","symbolStatus":"Symbols loaded.","symbolFilePath":"/data/home/pi/debug/App.pdb"}}}
<- (E) {"seq":43,"type":"event","event":"breakpoint","body":{"reason":"changed","breakpoint":{"id":1,"verified":true,"source":{"name":"Program.cs","path":"C:\\Users\\Mike\\Desktop\\vsdbg_bug\\App\\Program.cs","sourceReference":0,"checksums":[{"algorithm":"SHA256","checksum":"0c05fd4a2d5d8f48845d45948cad41e74a3e37ddfc68a57f2115a632279116f4"}]},"line":6,"endLine":6,"instructionReference":"0x0000007F725D2274","offset":0}}}
<- (E) {"seq":44,"type":"event","event":"breakpoint","body":{"reason":"changed","breakpoint":{"id":2,"verified":true,"source":{"name":"Program.cs","path":"C:\\Users\\Mike\\Desktop\\vsdbg_bug\\App\\Program.cs","sourceReference":0,"checksums":[{"algorithm":"SHA256","checksum":"0c05fd4a2d5d8f48845d45948cad41e74a3e37ddfc68a57f2115a632279116f4"}]},"line":7,"endLine":7,"instructionReference":"0x0000007F725D228C","offset":0}}}
App (4603): Loaded '/opt/Microsoft/dotnet/shared/Microsoft.NETCore.App/8.0.16/System.Runtime.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
<- (E) {"seq":46,"type":"event","event":"module","body":{"reason":"new","module":{"id":1002,"name":"System.Runtime.dll","path":"/opt/Microsoft/dotnet/shared/Microsoft.NETCore.App/8.0.16/System.Runtime.dll","isOptimized":true,"isUserCode":false,"version":"8.00.1625.21506","symbolStatus":"Skipped loading symbols."}}}
App (4603): Loaded '/opt/Microsoft/dotnet/shared/Microsoft.NETCore.App/8.0.16/System.Console.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
<- (E) {"seq":48,"type":"event","event":"module","body":{"reason":"new","module":{"id":1003,"name":"System.Console.dll","path":"/opt/Microsoft/dotnet/shared/Microsoft.NETCore.App/8.0.16/System.Console.dll","isOptimized":true,"isUserCode":false,"version":"8.00.1625.21506","symbolStatus":"Skipped loading symbols."}}}
App (4603): Loaded '/opt/Microsoft/dotnet/shared/Microsoft.NETCore.App/8.0.16/System.Threading.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
<- (E) {"seq":50,"type":"event","event":"module","body":{"reason":"new","module":{"id":1004,"name":"System.Threading.dll","path":"/opt/Microsoft/dotnet/shared/Microsoft.NETCore.App/8.0.16/System.Threading.dll","isOptimized":true,"isUserCode":false,"version":"8.00.1625.21506","symbolStatus":"Skipped loading symbols."}}}
App (4603): Loaded '/opt/Microsoft/dotnet/shared/Microsoft.NETCore.App/8.0.16/Microsoft.Win32.Primitives.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
<- (E) {"seq":52,"type":"event","event":"module","body":{"reason":"new","module":{"id":1005,"name":"Microsoft.Win32.Primitives.dll","path":"/opt/Microsoft/dotnet/shared/Microsoft.NETCore.App/8.0.16/Microsoft.Win32.Primitives.dll","isOptimized":true,"isUserCode":false,"version":"8.00.1625.21506","symbolStatus":"Skipped loading symbols."}}}
App (4603): Loaded '/opt/Microsoft/dotnet/shared/Microsoft.NETCore.App/8.0.16/System.Runtime.InteropServices.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
<- (E) {"seq":54,"type":"event","event":"module","body":{"reason":"new","module":{"id":1006,"name":"System.Runtime.InteropServices.dll","path":"/opt/Microsoft/dotnet/shared/Microsoft.NETCore.App/8.0.16/System.Runtime.InteropServices.dll","isOptimized":true,"isUserCode":false,"version":"8.00.1625.21506","symbolStatus":"Skipped loading symbols."}}}
App (4603): Loaded '/opt/Microsoft/dotnet/shared/Microsoft.NETCore.App/8.0.16/System.Collections.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
<- (E) {"seq":56,"type":"event","event":"module","body":{"reason":"new","module":{"id":1007,"name":"System.Collections.dll","path":"/opt/Microsoft/dotnet/shared/Microsoft.NETCore.App/8.0.16/System.Collections.dll","isOptimized":true,"isUserCode":false,"version":"8.00.1625.21506","symbolStatus":"Skipped loading symbols."}}}
App (4603): Loaded '/opt/Microsoft/dotnet/shared/Microsoft.NETCore.App/8.0.16/System.Memory.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
<- (E) {"seq":58,"type":"event","event":"module","body":{"reason":"new","module":{"id":1008,"name":"System.Memory.dll","path":"/opt/Microsoft/dotnet/shared/Microsoft.NETCore.App/8.0.16/System.Memory.dll","isOptimized":true,"isUserCode":false,"version":"8.00.1625.21506","symbolStatus":"Skipped loading symbols."}}}
<- (E) {"seq":59,"type":"event","event":"thread","body":{"reason":"started","threadId":4608}}
<- (E) {"seq":60,"type":"event","event":"attachComplete","body":{}}
<- (E) {"seq":61,"type":"event","event":"thread","body":{"reason":"started","threadId":4603}}
-> (C) {"command":"threads","type":"request","seq":8}
<- (R) {"seq":62,"type":"response","request_seq":8,"success":true,"command":"threads","body":{"threads":[{"id":4608,"name":"Thread #4608"},{"id":4603,"name":"Thread #4603"}]}}
[Debug Runtime Event] DBI Callback -- Breakpoint(AppDomain:0000003E88000D98, Thread:0000003E88003818, Breakpoint:0000003E8809EFF8)
<- (E) {"seq":64,"type":"event","event":"output","body":{"category":"telemetry","output":"VS/Diagnostics/Debugger/vsdbg/Attach","data":{"VS.Diagnostics.Debugger.vsdbg.Attach.DebuggerStartTime":552,"VS.Diagnostics.Debugger.vsdbg.SourceFileMappings":0,"VS.Diagnostics.Debugger.vsdbg.VisualizerFileUsed":false,"VS.Diagnostics.Debugger.vsdbg.TargetType":"Live","VS.Diagnostics.Debugger.vsdbg.TargetCLRVersion":"8.0.1625.21506","VS.Diagnostics.Debugger.vsdbg.AdapterId":"coreclr","VS.Diagnostics.Debugger.vsdbg.Distribution.Version":"12","VS.Diagnostics.Debugger.vsdbg.Distribution.Name":"debian","VS.Diagnostics.Debugger.vsdbg.OSFamily":"Linux","VS.Diagnostics.Debugger.vsdbg.Version":"17.13.20213.2 commit:94f9ba144fac710bef039d59c06d96da171fd332"}}}
<- (E) {"seq":65,"type":"event","event":"stopped","body":{"reason":"breakpoint","threadId":4603,"allThreadsStopped":true,"hitBreakpointIds":[1],"source":{"name":"Program.cs","path":"C:\\Users\\Mike\\Desktop\\vsdbg_bug\\App\\Program.cs"},"line":6,"column":1}}
-> (C) {"command":"threads","type":"request","seq":9}
<- (R) {"seq":66,"type":"response","request_seq":9,"success":true,"command":"threads","body":{"threads":[{"id":4608,"name":"<No Name>"},{"id":4603,"name":"Main Thread"}]}}
-> (C) {"command":"stackTrace","arguments":{"threadId":4603,"startFrame":0,"levels":20},"type":"request","seq":10}
f757dc51-62cc-4d2e-8880-d3f3aaeeb677:Class unavailable.
f757dc51-62cc-4d2e-8880-d3f3aaeeb677:Class unavailable.
f757dc51-62cc-4d2e-8880-d3f3aaeeb677:Class unavailable.
<- (R) {"seq":70,"type":"response","request_seq":10,"success":true,"command":"stackTrace","body":{"stackFrames":[{"id":1000,"name":"App.dll!Program.<Main>$(string[] args) Line 6","source":{"name":"Program.cs","path":"C:\\Users\\Mike\\Desktop\\vsdbg_bug\\App\\Program.cs","sourceReference":0,"checksums":[{"algorithm":"SHA256","checksum":"0c05fd4a2d5d8f48845d45948cad41e74a3e37ddfc68a57f2115a632279116f4"}]},"line":6,"column":1,"endLine":6,"endColumn":24,"instructionPointerReference":"0x0000007F725D2274","moduleId":1001},{"id":1001,"name":"[External Code]","line":0,"column":0,"presentationHint":"subtle"}],"totalFrames":2}}
-> (C) {"command":"scopes","arguments":{"frameId":1000},"type":"request","seq":11}
<- (R) {"seq":71,"type":"response","request_seq":11,"success":true,"command":"scopes","body":{"scopes":[{"name":"Locals","variablesReference":1000,"expensive":false}]}}
-> (C) {"command":"variables","arguments":{"variablesReference":1000},"type":"request","seq":12}
<- (R) {"seq":72,"type":"response","request_seq":12,"success":true,"command":"variables","body":{"variables":[{"name":"args [string[]]","value":"{string[0]}","type":"string[]","presentationHint":{"kind":"data","attributes":["canHaveObjectId"],"customUIVisualizers":[{"uiSideVisualizerTypeName":"Microsoft.VisualStudio.Debugger.IEnumerableVisualizer.IEnumerableVisualizer","uiSideVisualizerAssemblyName":"IEnumerableVisualizer.UI, Version=17.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a","debuggeeSideVisualizerTypeName":"Microsoft.VisualStudio.Debugger.IEnumerableVisualizer.IEnumerableVisualizerSource","debuggeeSideVisualizerAssemblyName":"IEnumerableVisualizer.DebuggeeSide, Version=17.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a","id":0,"menuName":"IEnumerable Visualizer","description":"IEnumerable Visualizer"}]},"evaluateName":"args","variablesReference":0,"memoryReference":"0x0000007ECD008B18"},{"name":"result [int]","value":"0","type":"int","presentationHint":{"kind":"data"},"evaluateName":"result","variablesReference":0,"memoryReference":"0x0000000000000000"}]}}
-> (C) {"command":"next","arguments":{"threadId":4603},"type":"request","seq":13}
-> (C) {"command":"next","arguments":{"threadId":4603},"type":"request","seq":13}
<- (E) {"seq":73,"type":"event","event":"continued","body":{"threadId":4603,"allThreadsContinued":true}}
<- (R) {"seq":74,"type":"response","request_seq":13,"success":true,"command":"next"}
[Debug Runtime Event] DBI Callback -- Breakpoint(AppDomain:0000003E88000D98, Thread:0000003E88003818, Breakpoint:0000003E7438E418)
[Debug Runtime Event] DBI Callback -- Breakpoint(AppDomain:0000003E88000D98, Thread:0000003E88003818, Breakpoint:0000003E8809F2C8)
[Debug Runtime Event] DBI Callback -- StepComplete(AppDomain:0000003E88000D98, Thread:0000003E88003818, Stepper:0000003E743FE368, Reason:0)
<- (E) {"seq":78,"type":"event","event":"stopped","body":{"reason":"step","threadId":4603,"allThreadsStopped":true,"hitBreakpointIds":[2],"source":{"name":"Program.cs","path":"C:\\Users\\Mike\\Desktop\\vsdbg_bug\\App\\Program.cs"},"line":7,"column":1}}
-> (C) {"command":"threads","type":"request","seq":14}
<- (R) {"seq":79,"type":"response","request_seq":14,"success":true,"command":"threads","body":{"threads":[{"id":4608,"name":"<No Name>"},{"id":4603,"name":"Main Thread"}]}}
-> (C) {"command":"stackTrace","arguments":{"threadId":4603,"startFrame":0,"levels":20},"type":"request","seq":15}
f757dc51-62cc-4d2e-8880-d3f3aaeeb677:Class unavailable.
f757dc51-62cc-4d2e-8880-d3f3aaeeb677:Class unavailable.
f757dc51-62cc-4d2e-8880-d3f3aaeeb677:Class unavailable.
<- (R) {"seq":83,"type":"response","request_seq":15,"success":true,"command":"stackTrace","body":{"stackFrames":[{"id":1000,"name":"App.dll!Program.<Main>$(string[] args) Line 7","source":{"name":"Program.cs","path":"C:\\Users\\Mike\\Desktop\\vsdbg_bug\\App\\Program.cs","sourceReference":0,"checksums":[{"algorithm":"SHA256","checksum":"0c05fd4a2d5d8f48845d45948cad41e74a3e37ddfc68a57f2115a632279116f4"}]},"line":7,"column":1,"endLine":7,"endColumn":65,"instructionPointerReference":"0x0000007F725D228C","moduleId":1001},{"id":1001,"name":"[External Code]","line":0,"column":0,"presentationHint":"subtle"}],"totalFrames":2}}
-> (C) {"command":"scopes","arguments":{"frameId":1000},"type":"request","seq":16}
<- (R) {"seq":84,"type":"response","request_seq":16,"success":true,"command":"scopes","body":{"scopes":[{"name":"Locals","variablesReference":1000,"expensive":false}]}}
-> (C) {"command":"variables","arguments":{"variablesReference":1000},"type":"request","seq":17}
<- (R) {"seq":85,"type":"response","request_seq":17,"success":true,"command":"variables","body":{"variables":[{"name":"Program.<Main>$.__Add|0_0 returned [int]","value":"7","type":"int","presentationHint":{"kind":"data","attributes":["readOnly"]},"evaluateName":"$ReturnValue1","variablesReference":0,"memoryReference":"0x0000000000000007"},{"name":"args [string[]]","value":"{string[0]}","type":"string[]","presentationHint":{"kind":"data","attributes":["canHaveObjectId"],"customUIVisualizers":[{"uiSideVisualizerTypeName":"Microsoft.VisualStudio.Debugger.IEnumerableVisualizer.IEnumerableVisualizer","uiSideVisualizerAssemblyName":"IEnumerableVisualizer.UI, Version=17.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a","debuggeeSideVisualizerTypeName":"Microsoft.VisualStudio.Debugger.IEnumerableVisualizer.IEnumerableVisualizerSource","debuggeeSideVisualizerAssemblyName":"IEnumerableVisualizer.DebuggeeSide, Version=17.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a","id":0,"menuName":"IEnumerable Visualizer","description":"IEnumerable Visualizer"}]},"evaluateName":"args","variablesReference":0,"memoryReference":"0x0000007ECD008B18"},{"name":"result [int]","value":"7","type":"int","presentationHint":{"kind":"data"},"evaluateName":"result","variablesReference":0,"memoryReference":"0x0000000000000007"}]}}

Test performed using .NET 8.

[JinShil]

3. This probably will not help, but can you try using the following logging settings and we can see if the .NET debugging services send any sort of interesting event before the process exits?

I performed this test again (using "request": "launch",), but kept the entire log for the full debug session, so it can be more easily compared with the prior post where performing the steps in suggestion 1. resulted in a successful step over the Add function.

Starting: "ssh" pi@192.168.0.10 "/opt/Microsoft/vsdbg/vsdbg --interpreter=vscode"
-> (C) {"command":"initialize","arguments":{"clientID":"vscode","clientName":"Visual Studio Code","adapterID":"coreclr","pathFormat":"path","linesStartAt1":true,"columnsStartAt1":true,"supportsVariableType":true,"supportsVariablePaging":true,"supportsRunInTerminalRequest":true,"locale":"en","supportsProgressReporting":true,"supportsInvalidatedEvent":true,"supportsMemoryReferences":true,"supportsArgsCanBeInterpretedByShell":true,"supportsMemoryEvent":true,"supportsStartDebuggingRequest":true,"supportsANSIStyling":true},"type":"request","seq":1}
ServiceBroker Start: 0 : Requesting proxy to "Microsoft.VisualStudio.Debugger.ManagedEditAndContinueRemoteDebuggerService2 (0.1)"
ServiceBroker Transfer: 0 : Transfer, relatedActivityId=e21c23d6-328b-42f9-aede-0fe0d54f51e1
ServiceBroker Start: 0 : Requesting pipe to "Microsoft.VisualStudio.Server.IBrokeredServiceBridgeManifest (0.1)"
ServiceBroker Stop: 0 : Requesting pipe to "Microsoft.VisualStudio.Server.IBrokeredServiceBridgeManifest (0.1)"
ServiceBroker Transfer: 0 : Transfer, relatedActivityId=90dc0ccd-4ccd-40ba-bd03-86931c077356
ServiceBroker Stop: 0 : Requesting proxy to "Microsoft.VisualStudio.Debugger.ManagedEditAndContinueRemoteDebuggerService2 (0.1)"
Error from pipe program 'ssh': Warning: Permanently added '192.168.0.10' (ED25519) to the list of known hosts.
-> (C) {"command":"launch","arguments":{"name":"Remote Debug","type":"coreclr","request":"launch","preLaunchTask":"postdeploy","program":"App","args":[],"cwd":"debug/","stopAtEntry":false,"console":"internalConsole","pipeTransport":{"pipeCwd":"C:\\Users\\Mike\\Desktop\\vsdbg_bug","pipeProgram":"ssh","pipeArgs":["pi@192.168.0.10"],"debuggerPath":"/opt/Microsoft/vsdbg/vsdbg"},"env":{"DISPLAY":":0.0"},"logging":{"moduleLoad":true,"trace":true,"exceptions":true,"engineLogging":false,"diagnosticsLog":{"debugRuntimeEventTracing":true}},"__configurationTarget":6,"hotReloadOnSave":true,"hotReloadVerbosity":"minimal","justMyCode":true,"requireExactSource":true,"enableStepFiltering":true,"suppressJITOptimizations":false,"symbolOptions":{"searchPaths":[],"searchMicrosoftSymbolServer":false,"searchNuGetOrgSymbolServer":false,"cachePath":"","moduleFilter":{"mode":"loadAllButExcluded","excludedModules":[],"includedModules":[],"includeSymbolsNextToModules":true,"includeSymbolsOnDemand":true}},"expressionEvaluationOptions":{"allowImplicitFuncEval":true,"allowToString":true,"allowFastEvaluate":true,"showRawValues":false},"internalConsoleOptions":"openOnSessionStart","__sessionId":"fcea2174-01a4-44a6-b8e3-15544b6eaab8"},"type":"request","seq":2}
------------------------------------------------------------------------------
You may only use the Microsoft Visual Studio .NET/C/C++ Debugger (vsdbg) with
Visual Studio Code, Visual Studio or Visual Studio for Mac software to help you
develop and test your applications.
------------------------------------------------------------------------------
<- (R) {"seq":4,"type":"response","request_seq":2,"success":true,"command":"launch"}
<- (E) {"seq":5,"type":"event","event":"initialized","body":{}}
-> (C) {"command":"setBreakpoints","arguments":{"source":{"name":"Program.cs","path":"c:\\Users\\Mike\\Desktop\\vsdbg_bug\\App\\Program.cs","checksums":[{"algorithm":"SHA1","checksum":"c463f9ac1155d29cf55e0358a3e036e35d1582b3"},{"algorithm":"SHA256","checksum":"06eae7e8b8ae1d2ea055d658c1054d2806c561adc36b60a1a0fcae351dab3cad"},{"algorithm":"SHA1","checksum":"3041e1e59767ec5e552e2ae2fab76b630aaebac0"},{"algorithm":"SHA256","checksum":"0f2cfd5426bddf18548a79f859c5264c3b853782956dacbb33d002793b76d3f2"}]},"lines":[4,5],"breakpoints":[{"line":4},{"line":5}],"sourceModified":false},"type":"request","seq":3}
-> (C) {"command":"setFunctionBreakpoints","arguments":{"breakpoints":[]},"type":"request","seq":4}
-> (C) {"command":"setExceptionBreakpoints","arguments":{"filters":[],"filterOptions":[{"filterId":"user-unhandled"}]},"type":"request","seq":5}
<- (E) {"seq":6,"type":"event","event":"output","body":{"category":"telemetry","output":"vs/diagnostics/debugger/vsdbg/BreakpointAdded","data":{"VS.Diagnostics.Debugger.vsdbg.BreakpointAdded.HasCondition":false,"VS.Diagnostics.Debugger.vsdbg.BreakpointAdded.BreakpointType":"Source","VS.Diagnostics.Debugger.vsdbg.AdapterId":"coreclr","VS.Diagnostics.Debugger.vsdbg.BreakpointAdded.HasHitCount":false,"VS.Diagnostics.Debugger.vsdbg.Distribution.Version":"12","VS.Diagnostics.Debugger.vsdbg.BreakpointAdded.HasLogMessage":false,"VS.Diagnostics.Debugger.vsdbg.Distribution.Name":"debian","VS.Diagnostics.Debugger.vsdbg.OSFamily":"Linux","VS.Diagnostics.Debugger.vsdbg.Version":"17.13.20213.2 commit:94f9ba144fac710bef039d59c06d96da171fd332"}}}
<- (E) {"seq":7,"type":"event","event":"output","body":{"category":"telemetry","output":"vs/diagnostics/debugger/vsdbg/BreakpointAdded","data":{"VS.Diagnostics.Debugger.vsdbg.BreakpointAdded.HasCondition":false,"VS.Diagnostics.Debugger.vsdbg.BreakpointAdded.BreakpointType":"Source","VS.Diagnostics.Debugger.vsdbg.AdapterId":"coreclr","VS.Diagnostics.Debugger.vsdbg.BreakpointAdded.HasHitCount":false,"VS.Diagnostics.Debugger.vsdbg.Distribution.Version":"12","VS.Diagnostics.Debugger.vsdbg.BreakpointAdded.HasLogMessage":false,"VS.Diagnostics.Debugger.vsdbg.Distribution.Name":"debian","VS.Diagnostics.Debugger.vsdbg.OSFamily":"Linux","VS.Diagnostics.Debugger.vsdbg.Version":"17.13.20213.2 commit:94f9ba144fac710bef039d59c06d96da171fd332"}}}
<- (R) {"seq":8,"type":"response","request_seq":3,"success":true,"command":"setBreakpoints","body":{"breakpoints":[{"id":1,"verified":false,"message":"The breakpoint is pending and will be resolved when debugging starts.","line":4},{"id":2,"verified":false,"message":"The breakpoint is pending and will be resolved when debugging starts.","line":5}]}}
<- (R) {"seq":9,"type":"response","request_seq":4,"success":true,"command":"setFunctionBreakpoints","body":{"breakpoints":[]}}
<- (R) {"seq":10,"type":"response","request_seq":5,"success":true,"command":"setExceptionBreakpoints","body":{"breakpoints":[{"verified":true}]}}
-> (C) {"command":"configurationDone","type":"request","seq":6}
<- (E) {"seq":11,"type":"event","event":"output","body":{"category":"telemetry","output":"VS/Diagnostics/Debugger/vsdbg/ProcessCreate","data":{"VS.Diagnostics.Debugger.vsdbg.Distribution.Version":"12","VS.Diagnostics.Debugger.vsdbg.TargetArchitecture":"ARM64","VS.Diagnostics.Debugger.vsdbg.Distribution.Name":"debian","VS.Diagnostics.Debugger.vsdbg.OSFamily":"Linux","VS.Diagnostics.Debugger.vsdbg.Version":"17.13.20213.2 commit:94f9ba144fac710bef039d59c06d96da171fd332"}}}
<- (E) {"seq":12,"type":"event","event":"process","body":{"name":"/data/home/pi/debug/App","systemProcessId":5012,"isLocalProcess":false,"startMethod":"launch"}}
ServiceBroker Start: 0 : Requesting proxy to "Microsoft.VisualStudio.Debugger.ManagedEditAndContinueCsDevKitEngineService2 (0.1)"
ServiceBroker Stop: 0 : Requesting proxy to "Microsoft.VisualStudio.Debugger.ManagedEditAndContinueCsDevKitEngineService2 (0.1)"
<- (E) {"seq":13,"type":"event","event":"breakpoint","body":{"reason":"changed","breakpoint":{"id":1,"verified":false,"message":"No symbols have been loaded for this document.","line":4}}}
<- (E) {"seq":14,"type":"event","event":"breakpoint","body":{"reason":"changed","breakpoint":{"id":2,"verified":false,"message":"No symbols have been loaded for this document.","line":5}}}
<- (R) {"seq":15,"type":"response","request_seq":6,"success":true,"command":"configurationDone"}
-> (C) {"command":"threads","type":"request","seq":7}
<- (R) {"seq":16,"type":"response","request_seq":7,"success":true,"command":"threads","body":{"threads":[]}}
[Debug Runtime Event] DBI Callback -- CreateProcess(Process:0000003E9800C128)
[Debug Runtime Event] DBI Callback -- CreateAppDomain(Process:0000003E9800C128, AppDomain:0000003EA4000D98)
[Debug Runtime Event] DBI Callback -- LoadAssembly(AppDomain:0000003EA4000D98, Assembly:0000003E98014058)
[Debug Runtime Event] DBI Callback -- LoadModule(AppDomain:0000003EA4000D98, Module:0000003E980141D8)
App (5012): Loaded '/opt/Microsoft/dotnet/shared/Microsoft.NETCore.App/8.0.16/System.Private.CoreLib.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
<- (E) {"seq":22,"type":"event","event":"module","body":{"reason":"new","module":{"id":1000,"name":"System.Private.CoreLib.dll","path":"/opt/Microsoft/dotnet/shared/Microsoft.NETCore.App/8.0.16/System.Private.CoreLib.dll","isOptimized":true,"isUserCode":false,"version":"8.00.1625.21506","symbolStatus":"Skipped loading symbols."}}}
[Debug Runtime Event] DBI Callback -- NameChange(AppDomain:0000003EA4000D98, Thread:0000000000000000)
[Debug Runtime Event] DBI Callback -- CreateThread(AppDomain:0000003EA4000D98, Thread:0000003E98013D08)
<- (E) {"seq":25,"type":"event","event":"thread","body":{"reason":"started","threadId":5012}}
[Debug Runtime Event] DBI Callback -- LoadAssembly(AppDomain:0000003EA4000D98, Assembly:0000003E98014618)
[Debug Runtime Event] DBI Callback -- LoadModule(AppDomain:0000003EA4000D98, Module:0000003E980146B8)
-> (C) {"command":"threads","type":"request","seq":8}
<- (R) {"seq":28,"type":"response","request_seq":8,"success":true,"command":"threads","body":{"threads":[{"id":5012,"name":"Thread #5012"}]}}
App (5012): Loaded '/data/home/pi/debug/App.dll'. Symbols loaded.
<- (E) {"seq":30,"type":"event","event":"module","body":{"reason":"new","module":{"id":1001,"name":"App.dll","path":"/data/home/pi/debug/App.dll","isOptimized":false,"isUserCode":true,"version":"1.00.0.0","symbolStatus":"Symbols loaded.","symbolFilePath":"/data/home/pi/debug/App.pdb"}}}
<- (E) {"seq":31,"type":"event","event":"breakpoint","body":{"reason":"changed","breakpoint":{"id":1,"verified":true,"source":{"name":"Program.cs","path":"C:\\Users\\Mike\\Desktop\\vsdbg_bug\\App\\Program.cs","sourceReference":0,"checksums":[{"algorithm":"SHA256","checksum":"06eae7e8b8ae1d2ea055d658c1054d2806c561adc36b60a1a0fcae351dab3cad"}]},"line":4,"endLine":4,"offset":0}}}
<- (E) {"seq":32,"type":"event","event":"breakpoint","body":{"reason":"changed","breakpoint":{"id":2,"verified":true,"source":{"name":"Program.cs","path":"C:\\Users\\Mike\\Desktop\\vsdbg_bug\\App\\Program.cs","sourceReference":0,"checksums":[{"algorithm":"SHA256","checksum":"06eae7e8b8ae1d2ea055d658c1054d2806c561adc36b60a1a0fcae351dab3cad"}]},"line":5,"endLine":5,"offset":0}}}
[Debug Runtime Event] DBI Callback -- LoadAssembly(AppDomain:0000003EA4000D98, Assembly:0000003E98014878)
[Debug Runtime Event] DBI Callback -- LoadModule(AppDomain:0000003EA4000D98, Module:0000003E98014918)
App (5012): Loaded '/opt/Microsoft/dotnet/shared/Microsoft.NETCore.App/8.0.16/System.Runtime.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
<- (E) {"seq":36,"type":"event","event":"module","body":{"reason":"new","module":{"id":1002,"name":"System.Runtime.dll","path":"/opt/Microsoft/dotnet/shared/Microsoft.NETCore.App/8.0.16/System.Runtime.dll","isOptimized":true,"isUserCode":false,"version":"8.00.1625.21506","symbolStatus":"Skipped loading symbols."}}}
[Debug Runtime Event] DBI Callback -- LoadAssembly(AppDomain:0000003EA4000D98, Assembly:0000003E98014AD8)
[Debug Runtime Event] DBI Callback -- LoadModule(AppDomain:0000003EA4000D98, Module:0000003E98014BD8)
App (5012): Loaded '/opt/Microsoft/dotnet/shared/Microsoft.NETCore.App/8.0.16/System.Console.dll'. Skipped loading symbols. Module is optimized and the debugger option 'Just My Code' is enabled.
<- (E) {"seq":40,"type":"event","event":"module","body":{"reason":"new","module":{"id":1003,"name":"System.Console.dll","path":"/opt/Microsoft/dotnet/shared/Microsoft.NETCore.App/8.0.16/System.Console.dll","isOptimized":true,"isUserCode":false,"version":"8.00.1625.21506","symbolStatus":"Skipped loading symbols."}}}
[Debug Runtime Event] DBI Callback -- Breakpoint(AppDomain:0000003EA4000D98, Thread:0000003E98013D08, Breakpoint:0000003EA4057E28)
[Debug Runtime Event] DBI Callback -- Breakpoint(AppDomain:0000003EA4000D98, Thread:0000003E98013D08, Breakpoint:0000003EA405AA48)
<- (E) {"seq":43,"type":"event","event":"breakpoint","body":{"reason":"changed","breakpoint":{"id":1,"verified":true,"source":{"name":"Program.cs","path":"C:\\Users\\Mike\\Desktop\\vsdbg_bug\\App\\Program.cs","sourceReference":0,"checksums":[{"algorithm":"SHA256","checksum":"06eae7e8b8ae1d2ea055d658c1054d2806c561adc36b60a1a0fcae351dab3cad"}]},"line":4,"endLine":4,"instructionReference":"0x0000007F66EC2258","offset":0}}}
<- (E) {"seq":44,"type":"event","event":"output","body":{"category":"telemetry","output":"VS/Diagnostics/Debugger/vsdbg/Launch","data":{"VS.Diagnostics.Debugger.vsdbg.Launch.DebuggerStartTime":776,"VS.Diagnostics.Debugger.vsdbg.SourceFileMappings":0,"VS.Diagnostics.Debugger.vsdbg.VisualizerFileUsed":false,"VS.Diagnostics.Debugger.vsdbg.TargetType":"Live","VS.Diagnostics.Debugger.vsdbg.TargetCLRVersion":"8.0.1625.21506","VS.Diagnostics.Debugger.vsdbg.AdapterId":"coreclr","VS.Diagnostics.Debugger.vsdbg.Distribution.Version":"12","VS.Diagnostics.Debugger.vsdbg.Distribution.Name":"debian","VS.Diagnostics.Debugger.vsdbg.OSFamily":"Linux","VS.Diagnostics.Debugger.vsdbg.Version":"17.13.20213.2 commit:94f9ba144fac710bef039d59c06d96da171fd332"}}}
<- (E) {"seq":45,"type":"event","event":"stopped","body":{"reason":"breakpoint","threadId":5012,"allThreadsStopped":true,"hitBreakpointIds":[1],"source":{"name":"Program.cs","path":"C:\\Users\\Mike\\Desktop\\vsdbg_bug\\App\\Program.cs"},"line":4,"column":1}}
-> (C) {"command":"threads","type":"request","seq":9}
<- (R) {"seq":46,"type":"response","request_seq":9,"success":true,"command":"threads","body":{"threads":[{"id":5012,"name":"Main Thread"}]}}
-> (C) {"command":"stackTrace","arguments":{"threadId":5012,"startFrame":0,"levels":20},"type":"request","seq":10}
f757dc51-62cc-4d2e-8880-d3f3aaeeb677:Class unavailable.
f757dc51-62cc-4d2e-8880-d3f3aaeeb677:Class unavailable.
f757dc51-62cc-4d2e-8880-d3f3aaeeb677:Class unavailable.
<- (R) {"seq":50,"type":"response","request_seq":10,"success":true,"command":"stackTrace","body":{"stackFrames":[{"id":1000,"name":"App.dll!Program.<Main>$(string[] args) Line 4","source":{"name":"Program.cs","path":"C:\\Users\\Mike\\Desktop\\vsdbg_bug\\App\\Program.cs","sourceReference":0,"checksums":[{"algorithm":"SHA256","checksum":"06eae7e8b8ae1d2ea055d658c1054d2806c561adc36b60a1a0fcae351dab3cad"}]},"line":4,"column":1,"endLine":4,"endColumn":24,"instructionPointerReference":"0x0000007F66EC2258","moduleId":1001},{"id":1001,"name":"[External Code]","line":0,"column":0,"presentationHint":"subtle"}],"totalFrames":2}}
-> (C) {"command":"scopes","arguments":{"frameId":1000},"type":"request","seq":11}
<- (R) {"seq":51,"type":"response","request_seq":11,"success":true,"command":"scopes","body":{"scopes":[{"name":"Locals","variablesReference":1000,"expensive":false}]}}
-> (C) {"command":"variables","arguments":{"variablesReference":1000},"type":"request","seq":12}
<- (R) {"seq":52,"type":"response","request_seq":12,"success":true,"command":"variables","body":{"variables":[{"name":"args [string[]]","value":"{string[0]}","type":"string[]","presentationHint":{"kind":"data","attributes":["canHaveObjectId"],"customUIVisualizers":[{"uiSideVisualizerTypeName":"Microsoft.VisualStudio.Debugger.IEnumerableVisualizer.IEnumerableVisualizer","uiSideVisualizerAssemblyName":"IEnumerableVisualizer.UI, Version=17.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a","debuggeeSideVisualizerTypeName":"Microsoft.VisualStudio.Debugger.IEnumerableVisualizer.IEnumerableVisualizerSource","debuggeeSideVisualizerAssemblyName":"IEnumerableVisualizer.DebuggeeSide, Version=17.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a","id":0,"menuName":"IEnumerable Visualizer","description":"IEnumerable Visualizer"}]},"evaluateName":"args","variablesReference":0,"memoryReference":"0x0000001580C08B18"},{"name":"result [int]","value":"0","type":"int","presentationHint":{"kind":"data"},"evaluateName":"result","variablesReference":0,"memoryReference":"0x0000000000000000"}]}}
-> (C) {"command":"next","arguments":{"threadId":5012},"type":"request","seq":13}
-> (C) {"command":"next","arguments":{"threadId":5012},"type":"request","seq":13}
<- (E) {"seq":53,"type":"event","event":"continued","body":{"threadId":5012,"allThreadsContinued":true}}
<- (R) {"seq":54,"type":"response","request_seq":13,"success":true,"command":"next"}
[Debug Runtime Event] DBI Callback -- ExitThread(AppDomain:0000003EA4000D98, Thread:0000003E98014E78)
[Debug Runtime Event] DBI Callback -- ExitProcess(Process:0000003E9800C128)
<- (E) {"seq":57,"type":"event","event":"output","body":{"category":"telemetry","output":"VS/Diagnostics/Debugger/MetaDataMemoryUsage","data":{"VS.Diagnostics.Debugger.TotalBytes":2754596.0,"VS.Diagnostics.Debugger.AdditionalModuleCount":0,"VS.Diagnostics.Debugger.vsdbg.TargetCLRVersion":"8.0.1625.21506","VS.Diagnostics.Debugger.TotalModuleCount":4,"VS.Diagnostics.Debugger.vsdbg.Distribution.Version":"12","VS.Diagnostics.Debugger.vsdbg.Distribution.Name":"debian","VS.Diagnostics.Debugger.vsdbg.OSFamily":"Linux","VS.Diagnostics.Debugger.vsdbg.Version":"17.13.20213.2 commit:94f9ba144fac710bef039d59c06d96da171fd332"}}}
[Important] Process App (5012) exited with a stepper still active
<- (E) {"seq":59,"type":"event","event":"output","body":{"category":"telemetry","output":"VS/Diagnostics/Debugger/IncompleteStep","data":{"VS.Diagnostics.Debugger.vsdbg.TargetCLRVersion":"8.0.1625.21506","VS.Diagnostics.Debugger.vsdbg.Distribution.Version":"12","VS.Diagnostics.Debugger.vsdbg.Distribution.Name":"debian","VS.Diagnostics.Debugger.vsdbg.OSFamily":"Linux","VS.Diagnostics.Debugger.vsdbg.Version":"17.13.20213.2 commit:94f9ba144fac710bef039d59c06d96da171fd332"}}}
<- (E) {"seq":60,"type":"event","event":"output","body":{"category":"telemetry","output":"VS/Diagnostics/Debugger/ExpressionEvaluator/DebugSessionEnded","data":{"VS.Diagnostics.Debugger.ExpressionEvaluator.FastExecuteDisabledCount.ExecutionException":0,"VS.Diagnostics.Debugger.ExpressionEvaluator.FastExecuteDisabledCount.BackwardBranchEncountered":0,"VS.Diagnostics.Debugger.ExpressionEvaluator.FastExecuteDisabledCount.MaxStackHeightExceeded":0,"VS.Diagnostics.Debugger.ExpressionEvaluator.FastExecuteDisabledCount.DecodeException":0,"VS.Diagnostics.Debugger.ExpressionEvaluator.FastExecuteDisabledCount.ExceptionClauses":0,"VS.Diagnostics.Debugger.ExpressionEvaluator.FastExecuteDisabledCount.None":0,"VS.Diagnostics.Debugger.ExpressionEvaluator.LINQ.count":0.0,"VS.Diagnostics.Debugger.vsdbg.Version":"17.13.20213.2 commit:94f9ba144fac710bef039d59c06d96da171fd332","VS.Diagnostics.Debugger.ExpressionEvaluator.ClrVersion":"8.0.1625.21506","VS.Diagnostics.Debugger.ExpressionEvaluator.SuccessCount":2.0,"VS.Diagnostics.Debugger.ExpressionEvaluator.FastExecuteDisabledCount.IlLength":0,"VS.Diagnostics.Debugger.vsdbg.OSFamily":"Linux","VS.Diagnostics.Debugger.vsdbg.Distribution.Name":"debian","VS.Diagnostics.Debugger.vsdbg.Distribution.Version":"12","VS.Diagnostics.Debugger.ExpressionEvaluator.SlowestFastExecuteTimeInMs":0.0,"VS.Diagnostics.Debugger.vsdbg.TargetCLRVersion":"8.0.1625.21506","VS.Diagnostics.Debugger.ExpressionEvaluator.GetPropertyValueCount":0,"VS.Diagnostics.Debugger.ExpressionEvaluator.FastExecuteSuccessCount":0,"VS.Diagnostics.Debugger.ExpressionEvaluator.FastExecuteAttemptCount":0,"VS.Diagnostics.Debugger.ExpressionEvaluator.TotalFastExecuteTimeInMs":0.0,"VS.Diagnostics.Debugger.ExpressionEvaluator.FailCount":0.0}}}
<- (E) {"seq":61,"type":"event","event":"output","body":{"category":"telemetry","output":"VS/Diagnostics/Debugger/vsdbg/ProcessExit","data":{"VS.Diagnostics.Debugger.vsdbg.ProcessExit.StdInWrittenTo":false,"VS.Diagnostics.Debugger.vsdbg.ProcessExit.StdInReadFrom":false,"VS.Diagnostics.Debugger.vsdbg.TargetCLRVersion":"8.0.1625.21506","VS.Diagnostics.Debugger.vsdbg.AdapterId":"coreclr","VS.Diagnostics.Debugger.vsdbg.Distribution.Version":"12","VS.Diagnostics.Debugger.vsdbg.Distribution.Name":"debian","VS.Diagnostics.Debugger.vsdbg.OSFamily":"Linux","VS.Diagnostics.Debugger.vsdbg.Version":"17.13.20213.2 commit:94f9ba144fac710bef039d59c06d96da171fd332"}}}
The program '[5012] App' has exited with code 0 (0x0).
<- (E) {"seq":63,"type":"event","event":"exited","body":{"exitCode":0}}
<- (E) {"seq":64,"type":"event","event":"terminated","body":{}}
-> (C) {"command":"disconnect","arguments":{"restart":false,"terminateDebuggee":false},"type":"request","seq":14}
<- (E) {"seq":65,"type":"event","event":"output","body":{"category":"telemetry","output":"VS/Diagnostics/Debugger/vsdbg/DebugCompleted","data":{"VS.Diagnostics.Debugger.vsdbg.DebugCompleted.BreakCounter":1,"VS.Diagnostics.Debugger.vsdbg.TargetCLRVersion":"8.0.1625.21506","VS.Diagnostics.Debugger.vsdbg.AdapterId":"coreclr","VS.Diagnostics.Debugger.vsdbg.Distribution.Version":"12","VS.Diagnostics.Debugger.vsdbg.Distribution.Name":"debian","VS.Diagnostics.Debugger.vsdbg.OSFamily":"Linux","VS.Diagnostics.Debugger.vsdbg.Version":"17.13.20213.2 commit:94f9ba144fac710bef039d59c06d96da171fd332"}}}
<- (R) {"seq":66,"type":"response","request_seq":14,"success":true,"command":"disconnect"}

Test performed using .NET 8.

[JinShil]

In an effort to be thorough, I installed the .NET 10.0.100-preview.4.25258.110 SDK to the ARM64 Linux device, and set the TargetFramework of both the library and the application to net10.0, and tested again. Unfortunately, the behavior is the same as that of .NET 8 and 9.

[gregg-miskelly]

I spent a while trying to reproduce your scenario, but unfortunately it is working for me.

Three things you could try, but I am not sure if any of them will work:

1: You could try changing your env settings to tell the .NET runtime to save core dumps on crashes. I believe you want:

            "env": {
                "DISPLAY": ":0.0",
                "DOTNET_DbgEnableMiniDump": "1",
                "DOTNET_DbgMiniDumpType": "2"
            },

2: You could try changing the pipe transport options to run vsdbg under ulimit -c unlimited in hopes this will get Linux to save a coredump if the target process crashes
3: You could try using strace to monitor the target process and see if you can get a call stack of where the abort happens. To do so you could set a breakpoint at the call to Add, after that hits use strace in 'attach' mode for the target process, and the continue

[JinShil]

I spent a while trying to reproduce your scenario, but unfortunately it is working for me.

That's discouraging. Did you use my precise test project, or did you recreate your own? If the latter, could you share you test project so I can try it?

1: You could try changing your env settings to tell the .NET runtime to save core dumps on crashes.

I tried that and was able to get a core dump. When I load the coredump in gdb and get the backtrace this is what I see:

#0  0x0000007fa1a082e4 in __GI___wait4 (pid=6369, stat_loc=0x7fd62f274c, options=0, usage=0x0) at ../sysdeps/unix/sysv/linux/wait4.c:30
#1  0x0000007fa174292c in ?? () from /opt/Microsoft/dotnet/shared/Microsoft.NETCore.App/8.0.16/libcoreclr.so
#2  0x0000007fa1743b60 in ?? () from /opt/Microsoft/dotnet/shared/Microsoft.NETCore.App/8.0.16/libcoreclr.so
#3  0x0000007fa1716b9c in ?? () from /opt/Microsoft/dotnet/shared/Microsoft.NETCore.App/8.0.16/libcoreclr.so
#4  <signal handler called>
#5  __pthread_kill_implementation (threadid=548177035328, signo=signo@entry=6, no_tid=no_tid@entry=0) at ./nptl/pthread_kill.c:44
#6  0x0000007fa19d0ab4 in __pthread_kill_internal (signo=6, threadid=<optimized out>) at ./nptl/pthread_kill.c:78
#7  0x0000007fa198a72c in __GI_raise (sig=sig@entry=6) at ../sysdeps/posix/raise.c:26
#8  0x0000007fa197747c in __GI_abort () at ./stdlib/abort.c:79
#9  0x0000007eb3184038 in RaiseFailFastException (arg1=<optimized out>, arg2=<optimized out>, arg3=<optimized out>) at /__w/1/s/src/coreclr/nativeaot/Runtime/unix/PalRedhawkUnix.cpp:94
#10 0x0000007eb314184c in PalRaiseFailFastException (arg1=0x0, arg2=0x0, arg3=1) at /__w/1/s/src/coreclr/nativeaot/Runtime/./PalRedhawkFunctions.h:144
#11 Thread::EnsureRuntimeInitialized (this=0x55aabf1cd8) at /__w/1/s/src/coreclr/nativeaot/Runtime/thread.cpp:1215
#12 Thread::ReversePInvokeAttachOrTrapThread (this=0x55aabf1cd8, pFrame=0x7fd62f3c60) at /__w/1/s/src/coreclr/nativeaot/Runtime/thread.cpp:1176
#13 0x0000007eb31a30c4 in Native_Native_Api__Add (a=<optimized out>, b=<optimized out>) at /data/home/pi/Native/Api.cs:9
#14 0x0000007f62092400 in ?? ()

The precise .NET runtime I'm testing with is 8.0.16.

[JinShil]

I found the problem. It's this bug: dotnet/runtime#95257 As I was navigating the runtime code in the aforementioned back trace, I was reminded of it, because this is the second time I've been burned by it.

I think the reason you were not able to reproduce it is because you need an ARM64 Linux device with a small amount of RAM to reproduce it. My test device only has 1GB. I suspect your test device has more RAM.

Thank you for your investigation and advise. Without your help, I would have easily put in a few hundred more hours on this.

For those that may also encounter this bug, add "DOTNET_GCHeapHardLimitPercent": "32" to your env as a workaround.

The reason it worked locally for me is because I had already added the DOTNET_GCHeapHardLimitPercent workaroud to /etc/profile.d/ in my device's OS, but those environment variables don't seem to get applied when using the remote debugger.