[Webkit-unassigned] [Bug 220707] New: [GTK] WebKitGTK crashes when scrolling in pdfjs viewer

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=220707

            Bug ID: 220707
           Summary: [GTK] WebKitGTK crashes when scrolling in pdfjs viewer
           Product: WebKit
           Version: WebKit Local Build
          Hardware: PC
                OS: Linux
            Status: NEW
          Keywords: Gtk
          Severity: Normal
          Priority: P3
         Component: New Bugs
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: bugreporter781 at outlook.com

Created attachment 417821

  --> https://bugs.webkit.org/attachment.cgi?id=417821&action=review

Bug demo in gjs

I was making a toy pdf viewer with gjs, webkitgtk, and pdfjs.

When I opened the sample pdf that comes with pdfjs and try scrolling up and down, webkitgtk processes crashed. 

I wrote the same script using another GObject Introspection binding, PyGObject, and it was reproduced with PyGObject as well.

The backtraces seem to suggest that problems lie within javascriptcoregtk, but I'm not sure about that.

Steps to reproduce:
1. Make a folder named 'bug_demo'
2. Download and unpack pdfjs 2.5.207-dist.zip [1] to a sub-directory 'pdfjs'
3. Download the attached bug demo(s), and put it into 'bug_demo'
4. Run the bug demo
5. Use pdfjs viewer to open 'pdfjs/web/compressed.tracemonkey-pldi-09.pdf'
6. Try scrolling up and down

[1] https://github.com/mozilla/pdf.js/releases/download/v2.5.207/pdfjs-2.5.207-dist.zip

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