[Webkit-unassigned] [Bug 193184] MessagePort is unexpectedly GC'ed after activity absence

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=193184

--- Comment #2 from Yoshiaki Jitsukawa <yoshiaki.jitsukawa at sony.com> ---
Attachment 358473 is a test for reproduction.

The main frame generates two MessagePorts port1 and port2 from a MessageChannel. port2 is passed to the iframe and bound to a XMLHttpRequest.

 <main frame>
 port1

 <iframe>
 port2 <- xhr

XHR gets a response after one second and then let port2 post a message to port1. However port1 is GC'ed after three times GC and port1 cannot receive the message. (Running GC two times was OK.)

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