Comment 4 for bug 1422105

StacktraceTop:
 send_frame_messages_timeout (data=0x4141bb0, data@entry=<error reading variable: value has been optimized out>) at compositor/meta-window-actor.c:798
 g_timeout_dispatch (source=0x36e7f80, callback=<optimized out>, user_data=<optimized out>) at /build/buildd/glib2.0-2.42.1/./glib/gmain.c:4520
 g_main_dispatch (context=0xb064f0) at /build/buildd/glib2.0-2.42.1/./glib/gmain.c:3111
 g_main_context_dispatch (context=context@entry=0xb064f0) at /build/buildd/glib2.0-2.42.1/./glib/gmain.c:3710
 g_main_context_iterate (context=0xb064f0, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /build/buildd/glib2.0-2.42.1/./glib/gmain.c:3781