Hello,

I am occasionally using VSCode and the Microsoft C++ extension for MongoDB server development on macOS. When I try to debug any of the produced binaries (which are compiled with debugging information enabled and no optimizations), the debugger just gets stuck and the process remains stuck in unkillable state.

OS version: macOS 10.13.6
VS Code Version: 1.27.1
C/C++ Extension Version: 0.18.1

My debugger configuration looks like this:

        {
            "name": "(lldb) Generic run",
            "type": "cppdbg",
            "request": "launch",
            "program": "${workspaceFolder}/build/ninja/mongo/db/s/collection_sharding_runtime_test",
            "args": [],
            "stopAtEntry": false,
            "cwd": "${workspaceFolder}",
            "environment": [],
            "externalConsole": true,
            "MIMode": "lldb"
        }

When I start this debugger configuration with breakpoint enabled, I am able to step through the code successfully, up to a point when an exception gets thrown at which case the debugger gets stuck and the following messages is printed on the console:

...
Loaded '/Users/kaloianm/workspace/mongo/build/ninja/mongo/db/s/collection_sharding_runtime_test'. Symbols loaded.
Execute debugger commands using "-exec <command>", for example "-exec info registers" will list registers in use (when GDB is the debugger)
ERROR: Exception while processing MIEngine operation. Unrecognized format of field "msg" in result: result-class: error
message: error: Failed to halt process: Process is not running. If the problem continues restart debugging.

What I noticed is that from the 4 threads that are in the process, one remains in the PAUSED mode and I can inspect its stack. The other 3 are unpausable and unkillable.

Let me know if I can provide any additional information to help debug this.

-Kal.