[Webkit-unassigned] [Bug 203650] New: Unbounded memory growth due to WebGL buffers not being freed

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=203650

            Bug ID: 203650
           Summary: Unbounded memory growth due to WebGL buffers not being
                    freed
           Product: WebKit
           Version: Safari 12
          Hardware: Macintosh
                OS: macOS 10.14
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebGL
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: arindam.bose at mapbox.com
                CC: dino at apple.com

Created attachment 382401

  --> https://bugs.webkit.org/attachment.cgi?id=382401&action=review

GL delete buffer memory growth example.

This is coming through from a bug report on Mapbox GL-JS
https://github.com/mapbox/mapbox-gl-js/issues/8771

Safari is seeing unbounded memory growth in interactions wherein the user is constantly loading and unloading tiles by panning or zooming the interactive map.
We were able to run use the Xcode instruments allocation tracker on a debug build of WebKit, and found that calls to `WebGLRenderingContext.deleteBuffer` was not freeing up memory.

We were able to confirm this by creating an isolated example page that repeatedly creates->uploads and then deletes a vertex buffer every frame, the example page is attached.
The process for the tab grows upto 6gb of memory consumption in 30s.

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