OpenGlControlBase.RequestNextFrameRendering has a memory leak in Avalonia 12

[MeltyPlayer]

Describe the bug

I have a custom OpenGL renderer in Avalonia that I've been using some time, but in Avalonia 12 it now steadily leaks memory. I haven't dug into it extensively, but I've been able to narrow the issue down to calling OpenGlControlBase.RequestNextFrameRendering() to queue up the next frame; the leak happens regardless of whether anything is actually rendered within.

To Reproduce

The following code should be enough to reproduce this issue:

public class OpenTkControl : OpenGlControlBase {
  protected override void OnOpenGlRender(GlInterface gl, int fb) {
    this.RequestNextFrameRendering();

    // (Rendering would happen here, but doesn't need to occur to trigger the leak)
  }
}

Expected behavior

Either that OpenGlControlBase.RequestNextFrameRendering wouldn't leak memory, or that OpenGlControlBase would expose another flow for consistently rendering at some framerate.

Avalonia version

12.0.1

OS

Windows

Additional context

No response

[MrJul]

I can't reproduce those results with the latest Avalonia and Angle on Windows.

The following screenshot was taken after running the OpenGL page in the Control Catalog with Disco enabled (which uses RequestNextFrameRendering) for a few minutes, showing that things are stable:

Could you please provide more information about your environment, along with a project that reproduces the issue?

[MeltyPlayer]

Sorry, yes, strangely enough the OpenGL component doesn't reproduce the issue when it's on its own. I'm not sure exactly what causes this memory leak, but I was able to reproduce it in the following tiny project:
https://github.com/MeltyPlayer/Avalonia12MemoryLeak

Sometimes when it runs, memory usage is super jagged and the memory leak is slow. But usually, this is enough to reproduce the graph like in my first comment.

As for the environment, I'm running this on Windows 11 as a standard C# desktop executable. I discovered the memory leak running it in debug mode in Visual Studio.

[emmauss]

Do you have multiple gpus on your system?

[MeltyPlayer]

This is on my laptop, which just has a single GPU: an NVIDIA GeForce RTX 3050 4GB.