Bug 253993

Tests that have `[ useThreadedScrolling=false ]` crash at: Exception Type: EXC_BAD_ACCESS (SIGSEGV) Exception Codes: KERN_INVALID_ADDRESS at 0x0000000000000168 Exception Codes: 0x0000000000000001, 0x0000000000000168 Termination Reason: Namespace SIGNAL, Code 11 Segmentation fault: 11 Terminating Process: exc handler [1769] VM Region Info: 0x168 is not in any region. Bytes before following region: 140737487199896 REGION TYPE START - END [ VSIZE] PRT/MAX SHRMOD REGION DETAIL UNUSED SPACE AT START ---> shared memory 7fffffee6000-7fffffee7000 [ 4K] r-x/r-x SM=SHM Application Specific Information: dyld config: DYLD_LIBRARY_PATH=/Volumes/Data/Development/system/webkit/OpenSource/WebKitBuild/Debug DYLD_FRAMEWORK_PATH=/Volumes/Data/Development/system/webkit/OpenSource/WebKitBuild/Debug CRASHING TEST: compositing/overflow/do-not-paint-outline-into-composited-scrolling-contents.html Thread 0 Crashed:: Dispatch queue: com.apple.main-thread 0 WebCore 0x1686bdeec WebCore::ScrollingTreeFrameScrollingNode::topContentInset() const + 12 (ScrollingTreeFrameScrollingNode.h:56) 1 WebCore 0x16b4c7569 WebCore::ScrollingTree::mainFrameTopContentInset() const + 57 (ScrollingTree.cpp:530) 2 WebKit 0x136419dc1 WebKit::RemoteScrollingCoordinatorProxy::topContentInset() const + 33 (RemoteScrollingCoordinatorProxy.cpp:289) 3 WebKit 0x135cef480 WebKit::RemoteLayerTreeDrawingAreaProxyMac::layoutBannerLayers(WebKit::RemoteLayerTreeTransaction const&) + 96 (RemoteLayerTreeDrawingAreaProxyMac.mm:145) 4 WebKit 0x135cefa37 WebKit::RemoteLayerTreeDrawingAreaProxyMac::didCommitLayerTree(IPC::Connection&, WebKit::RemoteLayerTreeTransaction const&, WebKit::RemoteScrollingCoordinatorTransaction const&) + 263 (RemoteLayerTreeDrawingAreaProxyMac.mm:174) 5 WebKit 0x135c9b8ad WebKit::RemoteLayerTreeDrawingAreaProxy::commitLayerTree(IPC::Connection&, WebKit::RemoteLayerTreeTransaction const&, WebKit::RemoteScrollingCoordinatorTransaction const&) + 1661 (RemoteLayerTreeDrawingAreaProxy.mm:175)