Rojetto commented 1 year ago

Type: Bug

While working on a project using SDL, I ran into a weird issue where after setting a breakpoint, the VS Code debugger (using lldb) would stop at the breakpoint and show the stack trace, but couldn't load variables or step. The program then also froze, even after stopping the debugger and had to be force quit. I reduced it to the following minimal example:

main.cpp

#include <SDL.h>
#include <map>

int main() {
    if (SDL_Init(SDL_INIT_VIDEO) != 0)
    {
        return -1;
    }

    std::map<int, int> badMap;

    return 0;
}

CMakeLists.txt

cmake_minimum_required(VERSION 3.15)
project(LLDB Repro)

# Set the C++ standard to be used for compilation
set(CMAKE_CXX_STANDARD 20)
set(CMAKE_CXX_STANDARD_REQUIRED ON)

# Define the source files to be compiled
file(GLOB_RECURSE SOURCE_FILES 
    main.cpp
)

# Create an executable from the source files
add_executable(${PROJECT_NAME} ${SOURCE_FILES})

# Find the SDL2 package
find_package(SDL2 REQUIRED)

# Add the SDL2 include directories and link the SDL2 libraries
target_include_directories(${PROJECT_NAME} PRIVATE ${SDL2_INCLUDE_DIRS})
target_link_libraries(${PROJECT_NAME} ${SDL2_LIBRARIES})

launch.json

{
    "version": "0.2.0",
    "configurations": [
        {
            "name": "(lldb) Launch",
            "type": "cppdbg",
            "request": "launch",
            "program": "${command:cmake.launchTargetPath}",
            "args": [],
            "stopAtEntry": false,
            "cwd": "${workspaceFolder}",
            "environment": [],
            "externalConsole": false,
            "MIMode": "lldb"
        }
    ],
}

c_cpp_properties.json

{
    "configurations": [
        {
            "name": "Mac",
            "includePath": [
                "${workspaceFolder}/**"
            ],
            "defines": [],
            "macFrameworkPath": [
                "/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/System/Library/Frameworks"
            ],
            "compilerPath": "/usr/bin/clang",
            "cStandard": "c17",
            "cppStandard": "c++20",
            "intelliSenseMode": "macos-clang-arm64",
            "configurationProvider": "ms-vscode.cmake-tools"
        }
    ],
    "version": 4
}

If I set a breakpoint in the main function, VS Code will break there, but then something crashes internally. If you remove either the map or SDL_Init, the problem disappears. I also tried debugging manually from the command line with LLDB, but there the issue doesn't appear.

robert@RMBA LLDB Repro % lldb --version
lldb-1403.0.17.64
Apple Swift version 5.8 (swiftlang-5.8.0.124.2 clang-1403.0.22.11.100)
robert@RMBA LLDB Repro % brew list --versions sdl2
sdl2 2.26.5

Extension version: 1.15.4 VS Code version: Code 1.78.2 (Universal) (b3e4e68a0bc097f0ae7907b217c1119af9e03435, 2023-05-10T14:44:45.204Z) OS version: Darwin arm64 22.4.0 Modes: Sandboxed: Yes

System Info

|Item|Value| |---|---| |CPUs|Apple M2 (8 x 24)| |GPU Status|2d_canvas: enabled
canvas_oop_rasterization: disabled_off
direct_rendering_display_compositor: disabled_off_ok
gpu_compositing: enabled
metal: disabled_off
multiple_raster_threads: enabled_on
opengl: enabled_on
rasterization: enabled
raw_draw: disabled_off_ok
video_decode: enabled
video_encode: enabled
vulkan: disabled_off
webgl: enabled
webgl2: enabled
webgpu: enabled| |Load (avg)|2, 2, 2| |Memory (System)|8.00GB (0.08GB free)| |Process Argv|--crash-reporter-id 87b0c4e4-4f3b-445b-9f36-34444426ed13| |Screen Reader|no| |VM|0%|

A/B Experiments

``` vsliv368:30146709 vsreu685:30147344 python383cf:30185419 vspor879:30202332 vspor708:30202333 vspor363:30204092 vswsl492cf:30256860 vstes627:30244334 vslsvsres303:30308271 vserr242:30382549 pythontb:30283811 vsjup518:30340749 pythonptprofiler:30281270 vshan820:30294714 vstes263:30335439 pythondataviewer:30285071 vscod805:30301674 binariesv615:30325510 bridge0708:30335490 bridge0723:30353136 cmake_vspar411:30581797 vsaa593:30376534 pythonvs932:30410667 cppdebug:30492333 vsclangdc:30486549 c4g48928:30535728 dsvsc012:30540252 pynewext54:30695312 azure-dev_surveyone:30548225 vscccc:30610679 3biah626:30602489 pyind779:30671433 89544117:30613380 pythonsymbol12:30671437 a9j8j154:30646983 showlangstatbar:30737416 vsctsb:30705553 azdwalk:30721579 pythonms35:30701012 pythonfmttext:30731395 fixhidewlkth:30730051 pythongtdpathcf:30739705 ```

H-G-Hristov commented 1 year ago

There are multiple reports on that. You can find them and link them here.

Just install CodeLLDB.

10816

https://github.com/microsoft/vscode-cpptools/issues/7240

5805

https://github.com/microsoft/vscode-cpptools/issues/9831 https://github.com/lldb-tools/lldb-mi/issues/101

Rojetto commented 1 year ago

Thanks, CodeLLDB seems to work much better even in normal operation.

microsoft / vscode-cpptools

C++ debugger crashes on M2 Mac when using SDL and std::map #10965

10816

5805