Created attachment 262798 [details] Backtrace WebKit::DrawingAreaProxyImpl::setNativeSurfaceHandleForCompositing called with this=0x0. The reporter was using Epiphany and clicked on a tab that was restored from a previous session, triggering the delayed load. Truncated backtrace: Thread no. 1 (10 frames) #0 WebKit::DrawingAreaProxyImpl::setNativeSurfaceHandleForCompositing at /usr/src/debug/webkitgtk-2.10.0/Source/WebKit2/UIProcess/DrawingAreaProxyImpl.cpp:306 #1 webkitWebViewBaseRealize at /usr/src/debug/webkitgtk-2.10.0/Source/WebKit2/UIProcess/API/gtk/WebKitWebViewBase.cpp:290 #6 gtk_widget_realize at gtkwidget.c:5386 #7 gtk_widget_map at gtkwidget.c:4918 #8 gtk_overlay_forall at gtkoverlay.c:617 #9 gtk_container_map at gtkcontainer.c:3689 #10 gtk_overlay_map at gtkoverlay.c:453 #11 _g_closure_invoke_va at gclosure.c:864 #14 gtk_widget_map at gtkwidget.c:4920 #15 gtk_paned_forall at gtkpaned.c:2081 Attaching the complete backtrace because the downstream report is private. (I see no personal data in the backtrace.)