The title says it all. [50248.366911] gnome-shell[1722]: segfault at 3391ca049 ip 00007f45f7c51d68 sp 00007ffcc8746580 error 4 in libglib-2.0.so.0.4600.2[7f45f7bec000+137000] More details here: https://bugzilla.gnome.org/show_bug.cgi?id=760924
It's already fixed in 3.18.4-r1. *** This bug has been marked as a duplicate of bug 576262 ***