[Webkit-unassigned] [Bug 136918] New: [iOS8 and Webkit Nightly][CSS Regions] Assertion failure and null dereference crash when using animations and regions

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=136918

           Summary: [iOS8 and Webkit Nightly][CSS Regions] Assertion
                    failure and null dereference crash when using
                    animations and regions
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Keywords: AdobeTracked
          Severity: Normal
          Priority: P2
         Component: CSS
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: stavila at adobe.com
            Blocks: 57312


Created an attachment (id=238305)
 --> (https://bugs.webkit.org/attachment.cgi?id=238305&action=review)
Test-case

The attached test-case causes Webkit Nightly to crash. iOS8 Safari is also affected. The assertion is in RenderFlowThread::cachedRegionForCompositedLayer:

    ASSERT(m_layerToRegionMap);
    RenderNamedFlowFragment* namedFlowFragment = m_layerToRegionMap->get(&childLayer);

In this scenario, m_layerToRegionMap is null.

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