[Webkit-unassigned] [Bug 173958] New: Crash in WebCore::ScrollingTreeFixedNode::updateLayersAfterAncestorChange

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=173958

            Bug ID: 173958
           Summary: Crash in
                    WebCore::ScrollingTreeFixedNode::updateLayersAfterAnce
                    storChange
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: rniwa at webkit.org
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

We're crashing inside CALayer sometimes:

              24 QuartzCore: -[CALayer setPosition:]
         ==> 24 WebCore: WebCore::ScrollingTreeFixedNode::updateLayersAfterAncestorChange(WebCore::ScrollingTreeNode const&, WebCore::FloatRect const&, WebCore::FloatSize const&) <==
                  24 WebCore: WebCore::ScrollingTreeFrameScrollingNodeIOS::updateLayersAfterViewportChange(WebCore::FloatRect const&, double)
                    24 WebKit: -[WKContentView didUpdateVisibleRect:unobscuredRect:unobscuredRectInScrollViewCoordinates:obscuredInset:inputViewBounds:scale:minimumScale:inStableState:isChangingObscuredInsetsInteractively:enclosedInScrollableAncestorView:]

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