[Webkit-unassigned] [Bug 142507] New: REGRESSION: Assertions in SimpleLineLayout::FlowContents::segmentIndexForPositionSlow on editing/selection/home-end.html

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=142507

            Bug ID: 142507
           Summary: REGRESSION: Assertions in
                    SimpleLineLayout::FlowContents::segmentIndexForPositio
                    nSlow on editing/selection/home-end.html
    Classification: Unclassified
           Product: WebKit
           Version: 528+ (Nightly build)
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: ap at webkit.org
                CC: zalan at apple.com

editing/selection/home-end.html has started to frequently crash with an assertion today:

https://webkit-test-results.appspot.com/dashboards/flakiness_dashboard.html#showAllRuns=true&tests=editing%2Fselection%2Fhome-end.html

Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
0   com.apple.JavaScriptCore          0x0000000105dc0b5a WTFCrash + 42 (Assertions.cpp:321)
1   com.apple.WebCore                 0x000000010bacb218 WebCore::SimpleLineLayout::FlowContents::segmentIndexForPositionSlow(unsigned int) const + 152 (SimpleLineLayoutFlowContents.cpp:59)
2   com.apple.WebCore                 0x000000010ac912a3 WebCore::SimpleLineLayout::FlowContents::segmentIndexForPosition(unsigned int) const + 99 (SimpleLineLayoutFlowContents.h:103)
3   com.apple.WebCore                 0x000000010ac90ecf WebCore::SimpleLineLayout::FlowContents::segmentForPosition(unsigned int) const + 31 (SimpleLineLayoutFlowContents.h:108)
4   com.apple.WebCore                 0x000000010b6d566e WebCore::SimpleLineLayout::TextFragmentIterator::textWidth(unsigned int, unsigned int, float) const + 622 (SimpleLineLayoutTextFragmentIterator.cpp:103)
5   com.apple.WebCore                 0x000000010b6d4f74 WebCore::SimpleLineLayout::TextFragmentIterator::nextTextFragment(float) + 484 (SimpleLineLayoutTextFragmentIterator.cpp:78)
6   com.apple.WebCore                 0x000000010b788fda WebCore::SimpleLineLayout::createLineRuns(WebCore::SimpleLineLayout::LineState&, WebCore::SimpleLineLayout::LineState const&, WTF::Vector<WebCore::SimpleLineLayout::Run, 10ul, WTF::CrashOnOverflow>&, WebCore::SimpleLineLayout::TextFragmentIterator&) + 698 (SimpleLineLayout.cpp:445)

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