We currently don't clear m_pendingSyncBackingStores in LayerTreeRenderer::purgeGLResources(), which means that we may try to assign backing stores to layers after TextureMapperLayer::clearBackingStoresRecursive() has been called.
Created attachment 176485 [details] Patch
Comment on attachment 176485 [details] Patch Clearing flags on attachment: 176485 Committed r136016: <http://trac.webkit.org/changeset/136016>
All reviewed patches have been landed. Closing bug.