[Webkit-unassigned] [Bug 91535] New: [Chromium] Out of Memory is observed when a large object is passed to a Web Worker

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=91535

           Summary: [Chromium] Out of Memory is observed when a large
                    object is passed to a Web Worker
           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: dimich at chromium.org
                CC: eric at webkit.org, levin at chromium.org


When a large object (like an ImageData) is serialized and passed into Web Worker, the MessageEvent that is created for the worker context is small (in V8 mind) but it owns a SerializedScriptValue which can be large. Since V8 does not know about real size of the allocated memeory, it is not scheduling GC for quite a while which can cause OOM in the renderer. 

See http://code.google.com/p/chromium/issues/detail?id=132769 for actual repro case.

The fix is to inform V8 about the actual size of the memory owned by the MessageEvent in that case. Patch is coming.

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