We crash in TiledCoreAnimationDrawingArea::adjustTransientZoom, trying to play with a null shadow layer. However, we always want a shadow layer when pinch zooming (except in Beth's new rubber banding mode, but we'll have to decide what to do about that later), so we should have one (and this will also avoid crashing). <rdar://problem/15898349>
Created attachment 222163 [details] repro
Created attachment 222179 [details] patch
Comment on attachment 222179 [details] patch disregard, typo
Comment on attachment 222179 [details] patch nevermind, I just can't read (my own patch!)
Comment on attachment 222179 [details] patch Attachment 222179 [details] did not pass mac-wk2-ews (mac-wk2): Output: http://webkit-queues.appspot.com/results/6269921973501952 New failing tests: platform/mac-wk2/tiled-drawing/fixed/four-bars.html platform/mac-wk2/tiled-drawing/fixed/negative-scroll-offset.html platform/mac-wk2/tiled-drawing/fixed/four-bars-with-header-and-footer.html platform/mac-wk2/tiled-drawing/clamp-out-of-bounds-scrolls.html platform/mac-wk2/tiled-drawing/fixed/fixed-position-out-of-view-negative-zindex.html platform/mac-wk2/tiled-drawing/sticky/negative-scroll-offset.html platform/mac-wk2/tiled-drawing/fixed/negative-scroll-offset-in-view.html platform/mac-wk2/tiled-drawing/scrolling-tree-slow-scrolling.html platform/mac-wk2/tiled-drawing/sticky/sticky-horizontal.html platform/mac-wk2/tiled-drawing/fixed/fixed-in-overflow.html platform/mac-wk2/tiled-drawing/scrolling-tree-after-scroll.html platform/mac-wk2/tiled-drawing/fixed/percentage-inside-fixed.html platform/mac-wk2/tiled-drawing/fixed/absolute-inside-fixed.html platform/mac-wk2/tiled-drawing/fixed/fixed-position-out-of-view.html platform/mac-wk2/tiled-drawing/fixed/nested-fixed.html platform/mac-wk2/tiled-drawing/null-parent-back-crash.html dom/xhtml/level3/core/canonicalform09.xhtml platform/mac-wk2/tiled-drawing/fixed/absolute-inside-out-of-view-fixed.html dom/xhtml/level3/core/canonicalform08.xhtml platform/mac-wk2/tiled-drawing/tiled-drawing-scroll-position-page-cache-restoration.html
Created attachment 222182 [details] Archive of layout-test-results from webkit-ews-11 for mac-mountainlion-wk2 The attached test failures were seen while running run-webkit-tests on the mac-wk2-ews. Bot: webkit-ews-11 Port: mac-mountainlion-wk2 Platform: Mac OS X 10.8.5
I'll file another bug to land the WebCore part that breaks the tests; landed the WK2 null checks in http://trac.webkit.org/changeset/163230.