.
Thread 1 (process 8526):
#0  find_tab_forward (display=0x1c56e60, type=META_TAB_LIST_NORMAL, 
    screen=0x1c8ae90, workspace=0x1c589c0, start=0x240f920, skip_first=0)
    at core/display.c:4323
	window = (MetaWindow *) 0x1cb9c80
	tmp = (GList *) 0x0
	__PRETTY_FUNCTION__ = "find_tab_forward"
#1  0x000000000041e7f9 in meta_display_get_tab_next (display=0x1c56e60, 
    type=META_TAB_LIST_NORMAL, screen=0x1c8ae90, workspace=0x1c589c0, 
    window=0x0, backward=0) at core/display.c:4493
	skip = 1
	tab_list = (GList *) 0x240f920
	ret = (MetaWindow *) 0x0
	__PRETTY_FUNCTION__ = "meta_display_get_tab_next"
#2  0x000000000042bfb0 in do_choose_window (display=0x1c56e60, 
    screen=0x1c8ae90, event_window=<value optimized out>, 
    event=0x7fffc3ce9db0, binding=0x1c5c8a0, backward=0, show_popup=1)
    at core/keybindings.c:2859
	type = META_TAB_LIST_NORMAL
	initial_selection = <value optimized out>
#3  0x000000000042c2ec in handle_switch (display=0x1c56e60, screen=0x0, 
    event_window=0x1c8ae90, event=0x1c589c0, binding=0x240f920)
    at core/keybindings.c:2948
No locals.
#4  0x0000000000429890 in meta_display_process_key_event (display=0x1c56e60, 
    window=0x0, event=0x7fffc3ce9db0) at core/keybindings.c:1218
	keysym = <value optimized out>
	keep_grab = 32767
	all_keys_grabbed = <value optimized out>
	str = <value optimized out>
	screen = <value optimized out>
	__PRETTY_FUNCTION__ = "meta_display_process_key_event"
#5  0x000000000041f926 in event_callback (event=0x7fffc3ce9db0, 
    data=0x1c56e60) at core/display.c:1587
	window = (MetaWindow *) 0x0
	property_for_window = (MetaWindow *) 0x0
	modified = <value optimized out>
	frame_was_receiver = 0
	filter_out_event = 0
#6  0x00000000004646a6 in filter_func (xevent=0x1c56e60, 
    event=<value optimized out>, data=0x1c8ae90) at ui/ui.c:83
	__PRETTY_FUNCTION__ = "filter_func"
#7  0x00007faabb27bd61 in gdk_event_translate (display=0x1bfa0a0, 
    event=0x2bbdd70, xevent=0x7fffc3ce9db0, return_exposes=0)
    at /build/buildd/gtk+2.0-2.16.0/gdk/x11/gdkevents-x11.c:349
	window = <value optimized out>
	filter_window = <value optimized out>
	window_impl = <value optimized out>
	return_val = <value optimized out>
	xoffset = <value optimized out>
	yoffset = <value optimized out>
	screen = <value optimized out>
	screen_x11 = <value optimized out>
	toplevel = <value optimized out>
	xwindow = <value optimized out>
	filter_xwindow = <value optimized out>
#8  0x00007faabb27d8c7 in _gdk_events_queue (display=0x1bfa0a0)
    at /build/buildd/gtk+2.0-2.16.0/gdk/x11/gdkevents-x11.c:2298
	node = (GList *) 0x240f980
	event = (GdkEvent *) 0x2bbdd70
	xevent = {type = 2, xany = {type = 2, serial = 251917, 
    send_event = 0, display = 0x1beec70, window = 130}, xkey = {type = 2, 
    serial = 251917, send_event = 0, display = 0x1beec70, window = 130, 
    root = 130, subwindow = 20971550, time = 1518435, x = 774, y = 709, 
    x_root = 774, y_root = 709, state = 24, keycode = 23, same_screen = 1}, 
  xbutton = {type = 2, serial = 251917, send_event = 0, display = 0x1beec70, 
    window = 130, root = 130, subwindow = 20971550, time = 1518435, x = 774, 
    y = 709, x_root = 774, y_root = 709, state = 24, button = 23, 
    same_screen = 1}, xmotion = {type = 2, serial = 251917, send_event = 0, 
    display = 0x1beec70, window = 130, root = 130, subwindow = 20971550, 
    time = 1518435, x = 774, y = 709, x_root = 774, y_root = 709, state = 24, 
    is_hint = 23 '\027', same_screen = 1}, xcrossing = {type = 2, 
    serial = 251917, send_event = 0, display = 0x1beec70, window = 130, 
    root = 130, subwindow = 20971550, time = 1518435, x = 774, y = 709, 
    x_root = 774, y_root = 709, mode = 24, detail = 23, same_screen = 1, 
    focus = 0, state = 80}, xfocus = {type = 2, serial = 251917, 
    send_event = 0, display = 0x1beec70, window = 130, mode = 130, 
    detail = 0}, xexpose = {type = 2, serial = 251917, send_event = 0, 
    display = 0x1beec70, window = 130, x = 130, y = 0, width = 20971550, 
    height = 0, count = 1518435}, xgraphicsexpose = {type = 2, 
    serial = 251917, send_event = 0, display = 0x1beec70, drawable = 130, 
    x = 130, y = 0, width = 20971550, height = 0, count = 1518435, 
    major_code = 0, minor_code = 774}, xnoexpose = {type = 2, 
    serial = 251917, send_event = 0, display = 0x1beec70, drawable = 130, 
    major_code = 130, minor_code = 0}, xvisibility = {type = 2, 
    serial = 251917, send_event = 0, display = 0x1beec70, window = 130, 
    state = 130}, xcreatewindow = {type = 2, serial = 251917, send_event = 0, 
    display = 0x1beec70, parent = 130, window = 130, x = 20971550, y = 0, 
    width = 1518435, height = 0, border_width = 774, 
    override_redirect = 709}, xdestroywindow = {type = 2, serial = 251917, 
    send_event = 0, display = 0x1beec70, event = 130, window = 130}, 
  xunmap = {type = 2, serial = 251917, send_event = 0, display = 0x1beec70, 
    event = 130, window = 130, from_configure = 20971550}, xmap = {type = 2, 
    serial = 251917, send_event = 0, display = 0x1beec70, event = 130, 
    window = 130, override_redirect = 20971550}, xmaprequest = {type = 2, 
    serial = 251917, send_event = 0, display = 0x1beec70, parent = 130, 
    window = 130}, xreparent = {type = 2, serial = 251917, send_event = 0, 
    display = 0x1beec70, event = 130, window = 130, parent = 20971550, 
    x = 1518435, y = 0, override_redirect = 774}, xconfigure = {type = 2, 
    serial = 251917, send_event = 0, display = 0x1beec70, event = 130, 
    window = 130, x = 20971550, y = 0, width = 1518435, height = 0, 
    border_width = 774, above = 3045131813638, override_redirect = 24}, 
  xgravity = {type = 2, serial = 251917, send_event = 0, display = 0x1beec70, 
    event = 130, window = 130, x = 20971550, y = 0}, xresizerequest = {
    type = 2, serial = 251917, send_event = 0, display = 0x1beec70, 
    window = 130, width = 130, height = 0}, xconfigurerequest = {type = 2, 
    serial = 251917, send_event = 0, display = 0x1beec70, parent = 130, 
    window = 130, x = 20971550, y = 0, width = 1518435, height = 0, 
    border_width = 774, above = 3045131813638, detail = 24, value_mask = 1}, 
  xcirculate = {type = 2, serial = 251917, send_event = 0, 
    display = 0x1beec70, event = 130, window = 130, place = 20971550}, 
  xcirculaterequest = {type = 2, serial = 251917, send_event = 0, 
    display = 0x1beec70, parent = 130, window = 130, place = 20971550}, 
  xproperty = {type = 2, serial = 251917, send_event = 0, 
    display = 0x1beec70, window = 130, atom = 130, time = 20971550, 
    state = 1518435}, xselectionclear = {type = 2, serial = 251917, 
    send_event = 0, display = 0x1beec70, window = 130, selection = 130, 
    time = 20971550}, xselectionrequest = {type = 2, serial = 251917, 
    send_event = 0, display = 0x1beec70, owner = 130, requestor = 130, 
    selection = 20971550, target = 1518435, property = 3045131813638, 
    time = 3045131813638}, xselection = {type = 2, serial = 251917, 
    send_event = 0, display = 0x1beec70, requestor = 130, selection = 130, 
    target = 20971550, property = 1518435, time = 3045131813638}, 
  xcolormap = {type = 2, serial = 251917, send_event = 0, 
    display = 0x1beec70, window = 130, colormap = 130, new = 20971550, 
    state = 0}, xclient = {type = 2, serial = 251917, send_event = 0, 
    display = 0x1beec70, window = 130, message_type = 130, format = 20971550, 
    data = {
      b = "c+\027\000\000\000\000\000\006\003\000\000Å\002\000\000\006\003\000", s = {11107, 23, 0, 0, 774, 0, 709, 0, 774, 0}, l = {1518435, 3045131813638, 
        3045131813638, 98784247832, 1}}}, xmapping = {type = 2, 
    serial = 251917, send_event = 0, display = 0x1beec70, window = 130, 
    request = 130, first_keycode = 0, count = 20971550}, xerror = {type = 2, 
    display = 0x3d80d, resourceid = 0, serial = 29289584, 
    error_code = 130 '\202', request_code = 0 '\0', minor_code = 0 '\0'}, 
  xkeymap = {type = 2, serial = 251917, send_event = 0, display = 0x1beec70, 
    window = 130, 
    key_vector = "\202\000\000\000\000\000\000\000\036\000@\001\000\000\000\000c+\027\000\000\000\000\000\006\003\000\000Å\002\000"}, pad = {2, 251917, 0, 
    29289584, 130, 130, 20971550, 1518435, 3045131813638, 3045131813638, 
    98784247832, 1, 80, 0 <repeats 11 times>}}
	xdisplay = (Display *) 0x1beec70
#9  0x00007faabb27dcee in gdk_event_dispatch (source=<value optimized out>, 
    callback=0, user_data=0x1c8ae90)
    at /build/buildd/gtk+2.0-2.16.0/gdk/x11/gdkevents-x11.c:2358
	display = (GdkDisplay *) 0x1bfa0a0
	event = <value optimized out>
#10 0x00007faaba2180ca in IA__g_main_context_dispatch (context=0x1bd34c0)
    at /build/buildd/glib2.0-2.20.0/glib/gmain.c:1814
No locals.
#11 0x00007faaba21b7a0 in g_main_context_iterate (context=0x1bd34c0, block=1, 
    dispatch=1, self=<value optimized out>)
    at /build/buildd/glib2.0-2.20.0/glib/gmain.c:2448
	max_priority = 0
	timeout = 0
	some_ready = 1
	nfds = 8
	allocated_nfds = <value optimized out>
	fds = (GPollFD *) 0x23cc230
	__PRETTY_FUNCTION__ = "g_main_context_iterate"
#12 0x00007faaba21bc6d in IA__g_main_loop_run (loop=0x1bd3750)
    at /build/buildd/glib2.0-2.20.0/glib/gmain.c:2656
	self = (GThread *) 0x1bc64d0
	__PRETTY_FUNCTION__ = "IA__g_main_loop_run"
#13 0x000000000042d620 in main (argc=1, argv=0x7fffc3cea608)
    at core/main.c:532
	act = {__sigaction_handler = {
    sa_handler = 0x42d9e0 <sigterm_handler>, 
    sa_sigaction = 0x42d9e0 <sigterm_handler>}, sa_mask = {__val = {
      0 <repeats 16 times>}}, sa_flags = 0, sa_restorer = 0x29}
	empty_mask = {__val = {0 <repeats 16 times>}}
	log_domains = {0x0, 0x46da8a "metacity", 0x46cf88 "Gtk", 
  0x46cf8c "Gdk", 0x46cf90 "GLib", 0x46cf95 "Pango", 0x46cf9b "GLib-GObject", 
  0x46cfa8 "GThread"}