Hang when resizing the window on Windows with an integrated graphics card

[zachbateman]

Bevy version

Current main (8777dd4).

Relevant system information

Windows 11

What you did

Ran a Bevy project and resized the window.

What went wrong

While resizing the application window, the program freezes up completely and crashes. This problem occurs on every run but may take repeated resizing before it shows up. This is occurring in my application along with the basic Bevy 3d Scene example.

Additional information

I bisected this and found the problem is introduced in 8122b35.

It seems like the issue is within WinitAppRunnerState::about_to_wait() where self.redraw_requested(event_loop) is always called for non-Windows platforms (where I assume the freezing does not occur), but there is unique, problematic logic for Windows that is causing self.redraw_requested(event_loop) to NOT be called enough.

The code causing this resize crash is also causing at least one related problem (and possibly others). See #19030 and my related PR #19772 where there is a freeze occurring during drag-and-drop events—the PR fix just ensures that self.redraw_requested(event_loop) runs during a drag-and-drop event.

This issue (along with #19030) can be fixed with the following code changes. That said, I'm not familiar with the reasons for the current code, and this may cause other problems that the existing Windows-specific code was meant to fix.

Other related issues per code comments: #17488 and #18027.

bevy_winit/src/state.rs lines 457-469

• Just comment out the Windows block

WindowEvent::RedrawRequested => {
    self.ran_update_since_last_redraw = false;

    // // https://github.com/bevyengine/bevy/issues/17488
    // #[cfg(target_os = "windows")]
    // {
    //     // Have the startup behavior run in about_to_wait, which prevents issues with
    //     // invisible window creation. https://github.com/bevyengine/bevy/issues/18027
    //     if self.startup_forced_updates == 0 {
    //         manual_run_redraw_requested = true;
    //     }
    // }
}

bevy_winit/src/state.rs lines 519-539

• Comment out the Windows block and replace it with just calling self.redraw_requested(event_loop) like occurs on non-Windows platforms

// // Have the startup behavior run in about_to_wait, which prevents issues with
// // invisible window creation. https://github.com/bevyengine/bevy/issues/18027
// #[cfg(target_os = "windows")]
// {
//     WINIT_WINDOWS.with_borrow(|winit_windows| {
//         let headless = winit_windows.windows.is_empty();
//         let exiting = self.app_exit.is_some();
//         let reactive = matches!(self.update_mode, UpdateMode::Reactive { .. });
//         let all_invisible = winit_windows
//             .windows
//             .iter()
//             .all(|(_, w)| !w.is_visible().unwrap_or(false));
//         if !exiting
//             && (self.startup_forced_updates > 0 || headless || all_invisible || reactive)
//         {
//             self.redraw_requested(event_loop);
//         }
//     });
// }
self.redraw_requested(event_loop);

Example of Crash

Bevy.Resize.Crash_20250714.mp4

[zachbateman]

I've been trying to sort out a fix here, but I can't figure out how to stop the intermittent crash (this issue) while also maintaining the continually updating behavior noted in #17488 and fixed in #18004 / 8122b35 which is what introduces this issue's intermittent resizing crash.

The "fix" I noted in the notes above simplifies the code and takes care of this issue's crash, but it reintroduces the bug of things being temporarily frozen while resizing or dragging the window. I much prefer to avoid the crash and deal with the freeze while resizing/dragging, but this really needs a deeper look from someone who understands it better.

@aloucks, you may have more insight here?

[IRSMsoso]

I tried to reproduce this with the 3d_scene example at both 8777dd4 and most recent main (7b62e85) and couldn't get it to crash no matter how much I yanked around the window. Biggest difference in our hardware that I can see is that I'm running with a dedicated GPU since my desktop's CPU doesn't have an integrated one.

SystemInfo {
    os: "Windows 11 Pro",
    kernel: "26100",
    cpu: "Intel(R) Core(TM) i9-10900F CPU @ 2.80GHz",
    core_count: "10",
    memory: "63.9 GiB"
}

AdapterInfo {
    name: "NVIDIA GeForce RTX 3070 Ti",
    vendor: 4318, device: 9346,
    device_type: DiscreteGpu,
    driver: "NVIDIA",
    driver_info: "580.88",
    backend: Vulkan
}

So I tried my laptop with both dedicated and integrated on both commit points (via PowerPreference::LowPower in RenderPlugin), but I still couldn't replicate it, not sure why that is. Here's the info for that machine:

SystemInfo {
    os: "Windows 11 Pro",
    kernel: "26100",
    cpu: "13th Gen Intel(R) Core(TM) i9-13900HX",
    core_count: "24",
    memory: "31.7 GiB"
}
AdapterInfo {
    name: "Intel(R) RaptorLake-S Mobile Graphics Controller",
    vendor: 32902,
    device: 42888,
    device_type: IntegratedGpu,
    driver: "Intel Corporation",
    driver_info: "101.6556",
    backend: Vulkan
}
AdapterInfo {
    name: "NVIDIA GeForce RTX 4070 Laptop GPU",
    vendor: 4318,
    device: 10336,
    device_type: DiscreteGpu,
    driver: "NVIDIA",
    driver_info: "576.28",
    backend: Vulkan
}

[zachbateman]

I'm still seeing the crash on latest main (335e39f).

@IRSMsoso I am using an Intel integrated GPU—not sure if that is related to this crash. System info below:

SystemInfo {
    os: "Windows 11 Pro",
    kernel: "26100",
    cpu: "13th Gen Intel(R) Core(TM) i9-13900K",
    core_count: "24",
    memory: "31.7 GiB"
}
AdapterInfo {
    name: "Intel(R) UHD Graphics 770",
    vendor: 32902,
    device: 42880,
    device_type: IntegratedGpu,
    driver: "Intel Corporation",
    driver_info: "101.6737",
    backend: Vulkan
}

[IRSMsoso]

Maybe... I tried with my laptop with it's integrated GPU by setting it in the settings of my App because I couldn't get bevy to use my integrated GPU without doing that, even with setting preferences through Nvidia control panel. It may be the case that because you do not have a dedicated GPU at all, that's what's causing the issue? Unsure.

[aojiaoxiaolinlin]

I'm also encountering a window crash issue. It gets triggered whenever I maximize the window and then restore it. I'm also using an Intel integrated GPU, but the crash doesn't happen on another machine running Linux.

Example of Crash

crash.mp4

System Info

SystemInfo {
os: "Windows 11 Home China",
kernel: "22631",
cpu: "12th Gen Intel(R) Core(TM) i5-12500H",
core_count: "12", memory: "15.7 GiB"
}
AdapterInfo {
name: "Intel(R) Iris(R) Xe Graphics",
vendor: 32902,
device: 18086,
device_type: IntegratedGpu,
driver: "Intel Corporation",
driver_info: "101.7026",
backend: Vulkan
}