[Webkit-unassigned] [Bug 126964] New: ASSERT(scrollingTree()) in ScrollingCoordinatorMac::createScrollingTreeNode

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=126964

           Summary: ASSERT(scrollingTree()) in
                    ScrollingCoordinatorMac::createScrollingTreeNode
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: ap at webkit.org
                CC: simon.fraser at apple.com, thorton at apple.com


Semi-frequently seeing this on random layout tests:

Thread 25 Crashed:: WebCore: Scrolling
0   com.apple.JavaScriptCore          0x0000000107afebda WTFCrash + 42 (Assertions.cpp:333)
1   com.apple.WebCore                 0x000000010a4b37e4 WebCore::ScrollingCoordinatorMac::createScrollingTreeNode(WebCore::ScrollingNodeType, unsigned long long) + 100 (ScrollingCoordinatorMac.mm:147)
2   com.apple.WebCore                 0x000000010995eadf WebCore::ThreadedScrollingTree::createNode(WebCore::ScrollingNodeType, unsigned long long) + 95 (ThreadedScrollingTree.cpp:125)
3   com.apple.WebCore                 0x000000010a4c4c4e WebCore::ScrollingTree::updateTreeFromStateNode(WebCore::ScrollingStateNode const*) + 462 (ScrollingTree.cpp:134)
4   com.apple.WebCore                 0x000000010a4c4983 WebCore::ScrollingTree::commitNewTreeState(WTF::PassOwnPtr<WebCore::ScrollingStateTree>) + 563 (ScrollingTree.cpp:107)
5   com.apple.WebCore                 0x000000010995e7e0 WebCore::ThreadedScrollingTree::commitNewTreeState(WTF::PassOwnPtr<WebCore::ScrollingStateTree>) + 112 (ThreadedScrollingTree.cpp:100)
6   com.apple.WebCore                 0x000000010a4b4706 WTF::FunctionWrapper<void (WebCore::ThreadedScrollingTree::*)(WTF::PassOwnPtr<WebCore::ScrollingStateTree>)>::operator()(WebCore::ThreadedScrollingTree*, WTF::PassOwnPtr<WebCore::ScrollingStateTree>) + 150 (Functional.h:246)
7   com.apple.WebCore                 0x000000010a4b4635 WTF::BoundFunctionImpl<WTF::FunctionWrapper<void (WebCore::ThreadedScrollingTree::*)(WTF::PassOwnPtr<WebCore::ScrollingStateTree>)>, void (WebCore::ThreadedScrollingTree*, WTF::PassOwnPtr<WebCore::ScrollingStateTree>)>::operator()() + 101 (Functional.h:522)
8   com.apple.WebCore                 0x00000001096c35f2 WTF::Function<void ()>::operator()() const + 114 (Functional.h:704)
9   com.apple.WebCore                 0x000000010a4c2d23 WebCore::ScrollingThread::dispatchFunctionsFromScrollingThread() + 195 (ScrollingThread.cpp:116)

http://build.webkit.org/results/Apple%20MountainLion%20Debug%20WK2%20(Tests)/r161937%20(15302)/platform/mac-wk2/tiled-drawing/fixed-background/fixed-body-background-crash-log.txt

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