[Webkit-unassigned] [Bug 95079] New: Assertion failure at WebCore::MessagePort::contextDestroyed() (MessagePort.cpp:158)

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=95079

           Summary: Assertion failure at
                    WebCore::MessagePort::contextDestroyed()
                    (MessagePort.cpp:158)
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: WebCore JavaScript
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: mark.lam at apple.com


This assertion failure has been seen to cause crashes on both the WK1 and WK2 Lion mac bots.

The earliest incidence of this that I found was:
 - build 1877
 - test: http/tests/security/XFrameOptions/x-frame-options-deny.html
 - change sets:
       http://trac.webkit.org/changeset/125609
       http://trac.webkit.org/changeset/125602
       http://trac.webkit.org/changeset/125603
       http://trac.webkit.org/changeset/125604
       http://trac.webkit.org/changeset/125605
       http://trac.webkit.org/changeset/125606
       http://trac.webkit.org/changeset/125608

The latest incidence of this was found on:
 - build 2257
 - test: http/tests/security/XFrameOptions/x-frame-options-deny-meta-tag-in-body.html

Sampling through the build history, I've seen this assertion crash manifest on the following tests (this is not an exhaustive list):
 - fast/events/message-port-context-destroyed.html (1901, 1920, 2055, 2218, 2222, 2227, 2234, 2639, 2832)
 - http/tests/security/aboutBlank/security-context-alias.html (build 2227, 2250)
 - http/tests/security/aboutBlank/security-context-grandchildren-alias.html (build 1890, 1905)
 - http/tests/security/aboutBlank/security-context-grandchildren-write-lexical.html (build 2233)
 - http/tests/security/XFrameOptions/x-frame-options-deny.html (build 1877)
 - http/tests/security/XFrameOptions/x-frame-options-deny-meta-tag-parent-same-origin-allow.html (build 1879)
 - http/tests/security/XFrameOptions/x-frame-options-parent-same-origin-allow.html (build 2055, 2218, 2229, 2234, 2235) 
 - http/tests/security/XFrameOptions/x-frame-options-parent-same-origin-deny.html (build 1885, 1903, 1920, 2239, 2244, 2245, 2246, 2249)

The crash / assertion failure is intermittent.  It does not necessarily manifest on every build test run, nor always on the same tests.  However, it has been seen to repeat on the same test more than once.

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