[Webkit-unassigned] [Bug 172575] New: Properties set on window.customElements are incorrectly removed by GC.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=172575

            Bug ID: 172575
           Summary: Properties set on window.customElements are
                    incorrectly removed by GC.
           Product: WebKit
           Version: Safari 10
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: HTML DOM
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: bicknellr at google.com
                CC: cdumez at apple.com

Occasionally, properties that are set on window.customElements very early in the lifetime of the page are removed by garbage collection. To repro, put the attached files in the same directory and open 'index.html'. You may need to adjust the number of objects created in 'test.html' to balance the repro rate with the time per run. You can also trigger this (at a reduced rate) by putting an external script that spins for 10-20ms between the write / read instead of creating objects. This seems to affect 10, TP, and Nightly.

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