Stack overflow in event handling

[andrewhickman]

Occasionally when I launch my application I get a stack overflow. I'm not sure the best way to debug this but the call stack looks like

GlutinWindow::poll_event()
GlutinWindow::handle_event()
GlutinWindow::poll_event()
GlutinWindow::handle_event()
...

My main loop is currently just

let window: GliumWindow = WindowSettings::new("test", [600, 400])
    .exit_on_esc(true)
    .opengl(GL)
    .build()?;
let g2d = Glium2d::new(OpenGL::V3_2, &win);

while let Some(event) = window.next() {
    if let Some(args) = event.render_args() {
        render(gs, args);
    }
    if let Some(args) = event.update_args() {
        update(gs, args);
    }
}

The overflow seems to always happen before any render or update events are actually passed to the main loop.

[bvssvni]

It's probably caused by 1e4d1ba.

I was aware the overflow could happen in theory, but it passed the tests.

Are you able to fork glutin_window and print out the events?

[andrewhickman]

by sticking a print at the start of handle_event I got this:

event: Some(WindowEvent { window_id: WindowId(WindowId(0x14150a)), event: Focused(true) })
event: Some(WindowEvent { window_id: WindowId(WindowId(0x14150a)), event: Resized(600, 400) })
event: Some(WindowEvent { window_id: WindowId(WindowId(0x14150a)), event: Moved(34, 57) })
event: Some(WindowEvent { window_id: WindowId(WindowId(0x14150a)), event: KeyboardInput { device_id: DeviceId(DeviceId), input: KeyboardInput { scancode: 28, state
: Released, virtual_keycode: Some(Return), modifiers: ModifiersState { shift: false, ctrl: false, alt: false, logo: false } } } })
event: Some(DeviceEvent { device_id: DeviceId(DeviceId), event: Motion { axis: 0, value: -1 } })
event: Some(DeviceEvent { device_id: DeviceId(DeviceId), event: Motion { axis: 0, value: -1 } })
event: Some(DeviceEvent { device_id: DeviceId(DeviceId), event: Motion { axis: 0, value: -1 } })
event: Some(DeviceEvent { device_id: DeviceId(DeviceId), event: Motion { axis: 0, value: -1 } })
event: Some(DeviceEvent { device_id: DeviceId(DeviceId), event: Motion { axis: 0, value: -1 } })
event: Some(DeviceEvent { device_id: DeviceId(DeviceId), event: Motion { axis: 0, value: -1 } })
event: Some(DeviceEvent { device_id: DeviceId(DeviceId), event: Motion { axis: 0, value: -1 } })
event: Some(DeviceEvent { device_id: DeviceId(DeviceId), event: Motion { axis: 0, value: -1 } })
event: Some(DeviceEvent { device_id: DeviceId(DeviceId), event: Motion { axis: 0, value: -1 } })
event: Some(DeviceEvent { device_id: DeviceId(DeviceId), event: Motion { axis: 0, value: -1 } })
event: Some(DeviceEvent { device_id: DeviceId(DeviceId), event: Motion { axis: 0, value: -1 } })
event: Some(DeviceEvent { device_id: DeviceId(DeviceId), event: Motion { axis: 0, value: -1 } })
event: Some(DeviceEvent { device_id: DeviceId(DeviceId), event: Motion { axis: 0, value: -1 } })
event: Some(DeviceEvent { device_id: DeviceId(DeviceId), event: Motion { axis: 0, value: -1 } })
event: Some(DeviceEvent { device_id: DeviceId(DeviceId), event: Motion { axis: 0, value: -1 } })
event: Some(DeviceEvent { device_id: DeviceId(DeviceId), event: Motion { axis: 0, value: -1 } })
event: Some(DeviceEvent { device_id: DeviceId(DeviceId), event: Motion { axis: 0, value: -1 } })
event: Some(DeviceEvent { device_id: DeviceId(DeviceId), event: Motion { axis: 0, value: -1 } })
event: Some(DeviceEvent { device_id: DeviceId(DeviceId), event: Motion { axis: 0, value: -1 } })
event: Some(DeviceEvent { device_id: DeviceId(DeviceId), event: Motion { axis: 0, value: -1 } })
event: Some(DeviceEvent { device_id: DeviceId(DeviceId), event: Motion { axis: 1, value: -1 } })
event: Some(DeviceEvent { device_id: DeviceId(DeviceId), event: Motion { axis: 0, value: -1 } })
event: Some(DeviceEvent { device_id: DeviceId(DeviceId), event: Motion { axis: 0, value: -1 } })
event: Some(DeviceEvent { device_id: DeviceId(DeviceId), event: Motion { axis: 0, value: -1 } })
event: Some(DeviceEvent { device_id: DeviceId(DeviceId), event: Motion { axis: 0, value: -1 } })
event: Some(DeviceEvent { device_id: DeviceId(DeviceId), event: Motion { axis: 0, value: -1 } })
event: Some(DeviceEvent { device_id: DeviceId(DeviceId), event: Motion { axis: 0, value: -1 } })
event: Some(DeviceEvent { device_id: DeviceId(DeviceId), event: Motion { axis: 1, value: -1 } })
event: Some(DeviceEvent { device_id: DeviceId(DeviceId), event: Motion { axis: 0, value: -1 } })
event: Some(DeviceEvent { device_id: DeviceId(DeviceId), event: Motion { axis: 0, value: -1 } })
event: Some(DeviceEvent { device_id: DeviceId(DeviceId), event: Motion { axis: 0, value: -1 } })
event: Some(DeviceEvent { device_id: DeviceId(DeviceId), event: Motion { axis: 0, value: -1 } })
event: Some(DeviceEvent { device_id: DeviceId(DeviceId), event: Motion { axis: 0, value: -1 } })
event: Some(DeviceEvent { device_id: DeviceId(DeviceId), event: Motion { axis: 0, value: -1 } })

... (some more similar events)

thread 'main' has overflowed its stack