Comment 3 for bug 1260467

StacktraceTop:
 boxes_vm_creator_guest_installed_os (machine=0x2f17500, self=0x32580e0) at /extra-data/checkout/gnome/gnome-boxes/src/vm-creator.vala:218
 boxes_vm_creator_on_machine_state_changed (self=0x32580e0, object=<optimized out>, pspec=0x0) at /extra-data/checkout/gnome/gnome-boxes/src/vm-creator.vala:147
 boxes_vm_creator_continue_installation_co (_data_=0x2f217f0) at /extra-data/checkout/gnome/gnome-boxes/src/vm-creator.vala:110
 g_simple_async_result_complete (simple=0x3348b20) at /build/buildd/glib2.0-2.39.1/./gio/gsimpleasyncresult.c:777
 boxes_media_manager_create_installer_media_from_config_co (_data_=0x2e7acf0) at /extra-data/checkout/gnome/gnome-boxes/src/media-manager.vala:68