JoltPhysics3D: Debug visible collisions crash

[hilloftheking]

Tested versions

• Reproducible in: v4.4.dev.mono.gh [4cf0231], v4.4.dev.mono.gh [44dfa7e], v4.4.dev.custom_build [cee5f8e31]

System information

Godot v4.4.dev (cee5f8e31) - Fedora Linux 41 (Workstation Edition) on Wayland - X11 display driver, Multi-window, 1 monitor - Vulkan (Forward+) - dedicated NVIDIA GeForce RTX 3060 Ti (nvidia; 565.77) - Intel(R) Core(TM) i7-10700F CPU @ 2.90GHz (16 threads)

Issue description

Running a project with debug collisions enabled causes a crash. Number of physics bodies does not seem to matter, it will crash even when there are none. Crash does not occur with GodotPhysics3D.

Thread 1 "godot.linuxbsd." received signal SIGILL, Illegal instruction.
0x0000000002ec03ef in CowData<Vector3>::get (this=<optimized out>, p_index=<optimized out>) at ./core/templates/cowdata.h:219
219			CRASH_BAD_INDEX(p_index, size());

 0 in CowData<Vector3>::get of ./core/templates/cowdata.h:219
 1 in Vector<Vector3>::operator[] of ./core/templates/vector.h:101
 2 in Viewport::_notification of scene/main/viewport.cpp:641
 3 in Viewport::_notificationv of ./scene/main/viewport.h:96
 4 in Window::_notificationv of scene/main/window.h:45
 5 in Object::notification of core/object/object.cpp:874
 6 in SceneTree::_process_group of scene/main/scene_tree.cpp:1049
 7 in SceneTree::_process of scene/main/scene_tree.cpp:1136
 8 in SceneTree::physics_process of scene/main/scene_tree.cpp:533
 9 in Main::iteration of main/main.cpp:4449
10 in OS_LinuxBSD::run of platform/linuxbsd/os_linuxbsd.cpp:962
11 in main of platform/linuxbsd/godot_linuxbsd.cpp:85

Steps to reproduce

1. Make a main scene; crash occurs regardless of scene root type
2. Switch to JoltPhysics3D
3. Enable Debug > Visible Collision Shapes
4. Run project

Minimal reproduction project (MRP)

N/A

[mihe]

Switch to JoltPhysics3D

Just to be clear, are you using the version of Jolt that's now built in to 4.4, meaning the Jolt Physics option in the physics/3d/physics_engine project setting, or are you trying to use the Godot Jolt extension in some way? The reason I ask is because the extension uses JoltPhysics3D as its registered physics engine name.

I'm not able to reproduce this on Windows 11 nor Linux Mint 22 with the built-in version of Jolt. I've tried a normal build, a normal build with ASan and a .NET build.

The fact that it's crashing with SIGILL, Illegal instruction strikes me as odd though. If you're not using the Godot Jolt extension, what arguments are you passing when compiling Godot?

EDIT: Nevermind the above, I just realized that's how CRASH_BAD_INDEX/__builtin_trap works.

[mihe]

I was able to reproduce it on Linux, with the built-in version of Jolt. I am however still not able to reproduce the crash on Windows for some reason.

I'll take a closer look.