[Webkit-unassigned] [Bug 203990] New: Safari leaks memory of objects send through postMessage

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=203990

            Bug ID: 203990
           Summary: Safari leaks memory of objects send through
                    postMessage
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Macintosh
                OS: macOS 10.14
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: New Bugs
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: mail at kkaefer.com

Created attachment 383109

  --> https://bugs.webkit.org/attachment.cgi?id=383109&action=review

Memory leak with web workers

Safari leaks memory when sending objects with `postMessage`. It happens when the message isn't accessed in any way on the receiver's side. As soon as the message object is referenced, even without modifying or actually reading its contents, the memory leak goes away. This applies to both webworkers and MessageChannel.

In the attached reproduction HTML pages, memory use grows to several gigabytes in the span of a few seconds. Uncommenting the `message.data;` statement removes the memory leak.

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