GDB selected frame is not updated when changing frame

[maxmarsc]

Environment

• OS and version: KUbuntu 22.04
• VS Code: 1.94.2
• C/C++ extension:v1.22.10
• GDB / LLDB version: 12.1

Bug Summary and Steps to Reproduce

Bug Summary: When selecting a new frame using the VSCode interface, it does not always update the frame scope from within GDB.

Steps to reproduce:

1. Configuration
   This simple C++ files is enough to reproduce the error :

// ccp_tools_bug.cpp
#include <iostream>

void bar() {
  std::cout << "bar" << std::endl;
}

int main() {
  bar();
  return 0;
}

Put a breakpoint on the bar function

2. Starts the debugger, when stopped on the bar function, you can check the current selected frame using this command :

-exec info frame

Then, use the vscode interface to select the top frame and rerun the command :

You can see the selected frame was updated with success.

Now select the bar frame again and recheck the selected frame :

Here you can see the selected frame is no longer updated.

---

This is a bug I encountered while developing a plugin for GDB. Unfortunately this bug breaks an important feature for VScode users , and requires to starts gdb manually from a terminal

Debugger Configurations

{
  "name": "(gdb) Launch",
  "type": "cppdbg",
  "request": "launch",
  "program": "${workspaceFolder}/build/examples/cpp_tools_bug",
  "args": [],
  "stopAtEntry": false,
  "cwd": "${fileDirname}",
  "environment": [],
  "externalConsole": false,
  "MIMode": "gdb",
  "setupCommands": [
    {
      "description": "Enable pretty-printing for gdb",
      "text": "-enable-pretty-printing",
      "ignoreFailures": true
    },
    {
      "description": "Set Disassembly Flavor to Intel",
      "text": "-gdb-set disassembly-flavor intel",
      "ignoreFailures": true
    }
  ]
},

Debugger Logs

Too much output, the log comes attached

Other Extensions

• autoDocstring
• Black Formatter
• Clang-Format
• clangd
• Cmajor-tools
• CMake
• Cmake tools
• cmake-format
• Docker
• CS 128 clang tidy
• graphical debugging

The issue persists after disabling all these extensions

Here is the log of the debug console : cpp_tools_bug.log

Additional Information

No response

[maxmarsc]

I just tested with gdb-14.2 built from sources and the issues it the same

[github-actions]

Thank you for reporting this issue. We’ll let you know if we need more information to investigate it. Additionally, if you're working with GDB/LLDB, please note that the code is open source at https://github.com/microsoft/MIEngine/wiki/Contributing-Code . Your contributions are always welcome and appreciated.