[Webkit-unassigned] [Bug 220948] New: ASSERT NOT REACHED in WebCore::DisplayList::isDrawingItem

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=220948

            Bug ID: 220948
           Summary: ASSERT NOT REACHED in
                    WebCore::DisplayList::isDrawingItem
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebCore Misc.
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: ryanhaddad at apple.com

The new test added with https://trac.webkit.org/changeset/271757/webkit is consistently failing a debug assertion:

    TestWebKitAPI.DisplayListTests.OutOfLineItemDecodingFailure
        SHOULD NEVER BE REACHED
        ./platform/graphics/displaylists/DisplayListItemType.cpp(240) : bool WebCore::DisplayList::isDrawingItem(WebCore::DisplayList::ItemType)
        1   0x1084284a9 WTFCrash
        2   0x12595f04b WTFCrashWithInfo(int, char const*, char const*, int)
        3   0x129ebfb94 WebCore::DisplayList::isDrawingItem(WebCore::DisplayList::ItemType)
        4   0x129ea47fb WebCore::DisplayList::DisplayList::iterator::updateCurrentItem()
        5   0x129ea4cbc WebCore::DisplayList::DisplayList::iterator::advance()
        6   0x129ea08c5 WebCore::DisplayList::DisplayList::iterator::operator++()
        7   0x129eba63a WebCore::DisplayList::Replayer::replay(WebCore::FloatRect const&, bool)
        8   0x105c0d112 TestWebKitAPI::DisplayListTests_OutOfLineItemDecodingFailure_Test::TestBody()
        9   0x106545284 void testing::internal::HandleSehExceptionsInMethodIfSupported<testing::Test, void>(testing::Test*, void (testing::Test::*)(), char const*)
        10  0x1065134eb void testing::internal::HandleExceptionsInMethodIfSupported<testing::Test, void>(testing::Test*, void (testing::Test::*)(), char const*)
        11  0x106513426 testing::Test::Run()
        12  0x10651457a testing::TestInfo::Run()
        13  0x1065153c4 testing::TestCase::Run()
        14  0x106520a88 testing::internal::UnitTestImpl::RunAllTests()
        15  0x10654a614 bool testing::internal::HandleSehExceptionsInMethodIfSupported<testing::internal::UnitTestImpl, bool>(testing::internal::UnitTestImpl*, bool (testing::internal::UnitTestImpl::*)(), char const*)
        16  0x10652057b bool testing::internal::HandleExceptionsInMethodIfSupported<testing::internal::UnitTestImpl, bool>(testing::internal::UnitTestImpl*, bool (testing::internal::UnitTestImpl::*)(), char const*)
        17  0x10652044d testing::UnitTest::Run()
        18  0x1062be991 RUN_ALL_TESTS()
        19  0x1062be922 TestWebKitAPI::TestsController::run(int, char**)
        20  0x1064de0c5 main
        21  0x7fff2038e621 start

https://results.webkit.org/?suite=api-tests&test=TestWebKitAPI.DisplayListTests.OutOfLineItemDecodingFailure

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