No subject

I couldn't reproduce with my development build. Full backtrace downstream.

Truncated backtrace:
Thread no. 1 (10 frames)
 #0 cairo_surface_set_device_scale
 #1 WebCore::cairoSurfaceSetDeviceScale(_cairo_surface*, double, double) at /usr/src/debug/webkitgtk-2.10.0/Source/WebCore/platform/graphics/cairo/CairoUtilities.cpp:292
 #2 WebKit::BackingStore::createBackend() at /usr/src/debug/webkitgtk-2.10.0/Source/WebKit2/UIProcess/cairo/BackingStoreCairo.cpp:72
 #3 WebKit::BackingStore::incorporateUpdate(WebKit::ShareableBitmap*, WebKit::UpdateInfo const&) at /usr/src/debug/webkitgtk-2.10.0/Source/WebKit2/UIProcess/cairo/BackingStoreCairo.cpp:89
 #4 WebKit::BackingStore::incorporateUpdate(WebKit::UpdateInfo const&) at /usr/src/debug/webkitgtk-2.10.0/Source/WebKit2/UIProcess/BackingStore.cpp:62
 #5 WebKit::DrawingAreaProxyImpl::incorporateUpdate(WebKit::UpdateInfo const&) at /usr/src/debug/webkitgtk-2.10.0/Source/WebKit2/UIProcess/DrawingAreaProxyImpl.cpp:221
 #6 WebKit::DrawingAreaProxy::didReceiveMessage(IPC::Connection&, IPC::MessageDecoder&) at /usr/src/debug/webkitgtk-2.10.0/Source/WebKit2/Platform/IPC/HandleMessage.h:16
 #10 IPC::MessageReceiverMap::dispatchMessage(IPC::Connection&, IPC::MessageDecoder&) at /usr/src/debug/webkitgtk-2.10.0/Source/WebKit2/Platform/IPC/MessageReceiverMap.cpp:102
 #11 WebKit::ChildProcessProxy::dispatchMessage(IPC::Connection&, IPC::MessageDecoder&) at /usr/src/debug/webkitgtk-2.10.0/Source/WebKit2/Shared/ChildProcessProxy.cpp:130
 #12 WebKit::WebProcessProxy::didReceiveMessage(IPC::Connection&amp;, IPC::MessageDecoder&amp;) at /usr/src/debug/webkitgtk-2.10.0/Source/WebKit2/UIProcess/WebProcessProxy.cpp:478</pre>
        </div>
      </p>
      <hr>
      <span>You are receiving this mail because:</span>
      
      <ul>
          <li>You are the assignee for the bug.</li>
      </ul>
    </body>
</html>
--1443213323.CB1afeb1.14595--