Process 661 (gnome-shell) of user 120 dumped core.

Stack trace of thread 661:
#0  0x00007f7a186117eb g_logv (libglib-2.0.so.0)
#1  0x00007f7a15aca369 n/a (libcogl.so.20)
#2  0x00007f7a15a7a97a n/a (libcogl.so.20)
#3  0x00007f7a15ac0515 cogl_framebuffer_allocate (libcogl.so.20)
#4  0x00007f7a15a7a03f n/a (libcogl.so.20)
#5  0x00007f7a15ac0918 cogl_framebuffer_clear4f (libcogl.so.20)
#6  0x00007f7a1afba885 st_theme_node_paint (libgnome-shell.so)
#7  0x00007f7a1afc5fcf st_widget_paint_background (libgnome-shell.so)
#8  0x00007f7a1afc5ffc n/a (libgnome-shell.so)
#9  0x00007f7a188e1122 n/a (libgobject-2.0.so.0)
#10 0x00007f7a188fb9d6 g_signal_emit_valist (libgobject-2.0.so.0)
#11 0x00007f7a188fc0bf g_signal_emit (libgobject-2.0.so.0)
#12 0x00007f7a1931321b clutter_actor_continue_paint (libclutter-1.0.so.0)
#13 0x00007f7a193193db n/a (libclutter-1.0.so.0)
#14 0x00007f7a19319710 n/a (libclutter-1.0.so.0)
#15 0x00007f7a188e1122 n/a (libgobject-2.0.so.0)
#16 0x00007f7a188fb9d6 g_signal_emit_valist (libgobject-2.0.so.0)
#17 0x00007f7a188fc0bf g_signal_emit (libgobject-2.0.so.0)
#18 0x00007f7a1931321b clutter_actor_continue_paint (libclutter-1.0.so.0)
#19 0x00007f7a193193db n/a (libclutter-1.0.so.0)
#20 0x00007f7a19319710 n/a (libclutter-1.0.so.0)
#21 0x00007f7a188e1122 n/a (libgobject-2.0.so.0)
#22 0x00007f7a188fb9d6 g_signal_emit_valist (libgobject-2.0.so.0)
#23 0x00007f7a188fc0bf g_signal_emit (libgobject-2.0.so.0)
#24 0x00007f7a1931321b clutter_actor_continue_paint (libclutter-1.0.so.0)
#25 0x00007f7a193193db n/a (libclutter-1.0.so.0)
#26 0x00007f7a19319710 n/a (libclutter-1.0.so.0)
#27 0x00007f7a188e1122 n/a (libgobject-2.0.so.0)
#28 0x00007f7a188fb9d6 g_signal_emit_valist (libgobject-2.0.so.0)
#29 0x00007f7a188fc0bf g_signal_emit (libgobject-2.0.so.0)
#30 0x00007f7a1931321b clutter_actor_continue_paint (libclutter-1.0.so.0)
#31 0x00007f7a193193db n/a (libclutter-1.0.so.0)
#32 0x00007f7a1af99560 n/a (libgnome-shell.so)
#33 0x00007f7a188e1122 n/a (libgobject-2.0.so.0)
#34 0x00007f7a188fb9d6 g_signal_emit_valist (libgobject-2.0.so.0)
#35 0x00007f7a188fc0bf g_signal_emit (libgobject-2.0.so.0)
#36 0x00007f7a1931321b clutter_actor_continue_paint (libclutter-1.0.so.0)
#37 0x00007f7a193193db n/a (libclutter-1.0.so.0)
#38 0x00007f7a1936bcca n/a (libclutter-1.0.so.0)
#39 0x00007f7a19f51bb5 n/a (libmutter.so.0)
#40 0x00007f7a188e11d4 n/a (libgobject-2.0.so.0)
#41 0x00007f7a188fb9d6 g_signal_emit_valist (libgobject-2.0.so.0)
#42 0x00007f7a188fc0bf g_signal_emit (libgobject-2.0.so.0)
#43 0x00007f7a1931321b clutter_actor_continue_paint (libclutter-1.0.so.0)
#44 0x00007f7a193193db n/a (libclutter-1.0.so.0)
#45 0x00007f7a1936fedb n/a (libclutter-1.0.so.0)
#46 0x00007f7a19301809 n/a (libclutter-1.0.so.0)
#47 0x00007f7a1936e707 n/a (libclutter-1.0.so.0)
#48 0x00007f7a19358459 n/a (libclutter-1.0.so.0)
#49 0x00007f7a1860af07 g_main_context_dispatch (libglib-2.0.so.0)
#50 0x00007f7a1860b160 n/a (libglib-2.0.so.0)
#51 0x00007f7a1860b482 g_main_loop_run (libglib-2.0.so.0)
#52 0x00007f7a19f7ad3c meta_run (libmutter.so.0)
#53 0x0000000000402197 main (gnome-shell)
#54 0x00007f7a18023710 __libc_start_main (libc.so.6)
#55 0x00000000004022c9 n/a (gnome-shell)

Stack trace of thread 663:
#0  0x00007f7a180e1c3d poll (libc.so.6)
#1  0x00007f7a1860b0fc n/a (libglib-2.0.so.0)
#2  0x00007f7a1860b20c g_main_context_iteration (libglib-2.0.so.0)
#3  0x00007f7a1860b249 n/a (libglib-2.0.so.0)
#4  0x00007f7a18631975 n/a (libglib-2.0.so.0)
#5  0x00007f7a183ab424 start_thread (libpthread.so.0)
#6  0x00007f7a180eacbd __clone (libc.so.6)

Stack trace of thread 667:
#0  0x00007f7a180e1c3d poll (libc.so.6)
#1  0x00007f7a144531b1 n/a (libpulse.so.0)
#2  0x00007f7a14444761 pa_mainloop_poll (libpulse.so.0)
#3  0x00007f7a14444dfe pa_mainloop_iterate (libpulse.so.0)
#4  0x00007f7a14444eb0 pa_mainloop_run (libpulse.so.0)
#5  0x00007f7a144530f9 n/a (libpulse.so.0)
#6  0x00007f7a099ffb08 n/a (libpulsecommon-8.0.so)
#7  0x00007f7a183ab424 start_thread (libpthread.so.0)
#8  0x00007f7a180eacbd __clone (libc.so.6)

Stack trace of thread 718:
#0  0x00007f7a183b103f pthread_cond_wait@@GLIBC_2.3.2 (libpthread.so.0)
#1  0x00007f7a0b1294a0 PR_WaitCondVar (libnspr4.so)
#2  0x00007f7a13ea5e9e n/a (libmozjs-24.so)
#3  0x00007f7a0b12edcb n/a (libnspr4.so)
#4  0x00007f7a183ab424 start_thread (libpthread.so.0)
#5  0x00007f7a180eacbd __clone (libc.so.6)

Stack trace of thread 719:
#0  0x00007f7a183b103f pthread_cond_wait@@GLIBC_2.3.2 (libpthread.so.0)
#1  0x00007f7a0b1294a0 PR_WaitCondVar (libnspr4.so)
#2  0x00007f7a13f19816 n/a (libmozjs-24.so)
#3  0x00007f7a0b12edcb n/a (libnspr4.so)
#4  0x00007f7a183ab424 start_thread (libpthread.so.0)
#5  0x00007f7a180eacbd __clone (libc.so.6)

Stack trace of thread 666:
#0  0x00007f7a180e1c3d poll (libc.so.6)
#1  0x00007f7a1860b0fc n/a (libglib-2.0.so.0)
#2  0x00007f7a1860b20c g_main_context_iteration (libglib-2.0.so.0)
#3  0x00007f7a043d643d n/a (libdconfsettings.so)
#4  0x00007f7a18631975 n/a (libglib-2.0.so.0)
#5  0x00007f7a183ab424 start_thread (libpthread.so.0)
#6  0x00007f7a180eacbd __clone (libc.so.6)

Stack trace of thread 664:
#0  0x00007f7a180e1c3d poll (libc.so.6)
#1  0x00007f7a1860b0fc n/a (libglib-2.0.so.0)
#2  0x00007f7a1860b482 g_main_loop_run (libglib-2.0.so.0)
#3  0x00007f7a18e146d6 n/a (libgio-2.0.so.0)
#4  0x00007f7a18631975 n/a (libglib-2.0.so.0)
#5  0x00007f7a183ab424 start_thread (libpthread.so.0)
#6  0x00007f7a180eacbd __clone (libc.so.6)