[Webkit-unassigned] [Bug 210105] New: Serious WebAssembly breakage in Safari 13

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=210105

            Bug ID: 210105
           Summary: Serious WebAssembly breakage in Safari 13
           Product: WebKit
           Version: Safari 13
          Hardware: PC
                OS: All
            Status: NEW
          Severity: Major
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: alessandro at leaningtech.com

Created attachment 395671

  --> https://bugs.webkit.org/attachment.cgi?id=395671&action=review

Font rendering corrupted

The issue can be reproduced on the following page: https://cheerpjdemos.leaningtech.com/SwingDemo.html#demo

Font rendering is based on WebAssembly, and renders correctly in Safari 12.1 and all the other browsers. With Safari 13 and a local build of WebKitGtk the rendering is corrupted, see attached image.

We have received multiple bug reports caused by Safari 13 on our WebAssembly based products, we believe there may be a serious miscompilation problem.

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