Bus error setting cursor.visible

[jeffs]

Bevy version

12.1

Relevant system information

macOS Sonoma 14.2

What you did

I tried to hide the cursor by setting window.cursor.visible = false. Here's the code:
https://github.com/jeffs/edu-bevy-spaceship-game/blob/hide-cursor/game-main/src/main.rs#L19-L24

What went wrong

The program crashed. It crashes reliably on Startup or PostStartup:

$ cargo run
    Finished dev [optimized + debuginfo] target(s) in 0.29s
     Running `target/debug/game-main`
2023-12-17T13:36:44.505720Z  INFO bevy_render::renderer: AdapterInfo { name: "Apple M2 Pro", vendor: 0, device: 0, device_type: IntegratedGpu, driver: "", driver_info: "", backend: Metal }
2023-12-17T13:36:44.646591Z  INFO bevy_winit::system: Creating new window "App" (0v0)
2023-12-17T13:36:44.674669Z  INFO bevy_diagnostic::system_information_diagnostics_plugin::internal: SystemInfo { os: "MacOS 14.2 ", kernel: "23.2.0", cpu: "Apple M2 Pro", core_count: "12", memory: "32.0 GiB" }
[1]    14694 bus error  cargo run

Additional information

This seems to be rooted in winit. I also just filed:

• Bus error when changing cursor rust-windowing/winit#3267
• Bus error when hiding cursor rust-windowing/winit#3268

The surrounding code is based on Zymartu's Bevy 0.12 Beginner Tutorial Series, but I don't think it's relevant.

[jeffs]

The winit maintainer closed both upstream issues, as they refuse to crash in the debugger, and they're unable to reproduce on their own machine. I'll try on another machine when I can.

[doonv]

This example works perfectly fine on Kubuntu 23.10:

use bevy::{prelude::*, window::PrimaryWindow};

pub fn hide_cursor(mut window: Query<&mut Window, With<PrimaryWindow>>) {
    let Ok(mut window) = window.get_single_mut() else {
        return;
    };
    window.cursor.visible = false;
}
fn setup(mut commands: Commands) {
    commands.spawn(Camera2dBundle::default());
}

fn main() {
    App::new()
        .add_plugins(DefaultPlugins)
        .add_systems(Startup, setup)
        .add_systems(PostStartup, hide_cursor)
        .run();
}

[jeffs]

This Objective-C code crashes intermittently for me on a current generation Macbook Pro; so, I'm guessing this is in no way specific to Bevy, or possibly even winit.

#import <AppKit/AppKit.h>

int main(int argc, const char * argv[]) {
    @autoreleasepool {
        NSLog(@"hiding");        
        [NSCursor hide];
        NSLog(@"hidden");        
    }
    return 0;
}

Will not be offended if somebody closes this ticket. As a heads up though, other folks might see the same issue.