[Webkit-unassigned] [Bug 62292] New: Worker object may be garbage collected even if it has message handlers

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=62292

           Summary: Worker object may be garbage collected even if it has
                    message handlers
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebCore Misc.
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: yurys at chromium.org
                CC: dimich at chromium.org, levin at chromium.org,
                    pfeldman at chromium.org


Currently if you create a dedicated worker by calling the following function:

function createWorker() {
    var worker = new Worker("worker.js");
    worker.onmessage = function(event) {
       console.log("Message from worker: " + event.data);
    };
    worker.postMessage("ping");
}

the worker object may well be GC'ed before any message from the worker
context is received. This behavior looks confusing. The spec doesn't say
anything specific about this while in many examples there no references
to the worker object to which onmessage/onerror handlers are attached which
means that those samples may be affected by this issue.

Should we protect the worker from being collected while it has message
handlers? Probably this problem has already been discussed.

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