[Webkit-unassigned] [Bug 262265] New: ASSERTION FAILED: foundAncestor /app/webkit/Source/WebCore/rendering/RenderLayer.cpp(2440)

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=262265

            Bug ID: 262265
           Summary: ASSERTION FAILED: foundAncestor
                    /app/webkit/Source/WebCore/rendering/RenderLayer.cpp(2
                    440)
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: PC
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: 1319794503 at qq.com
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

Created attachment 467939

  --> https://bugs.webkit.org/attachment.cgi?id=467939&action=review

testcase to trigger the crash

ASSERTION FAILED: foundAncestor
/app/webkit/Source/WebCore/rendering/RenderLayer.cpp(2440) : const WebCore::RenderLayer* WebCore::accumulateOffsetTowardsAncestor(const RenderLayer*, const RenderLayer*, LayoutPoint&, RenderLayer::ColumnOffsetAdjustment)

The minimized testcase will be upload as soon as possible.

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