notification area crashes with GDK_SYNCHRONIZE 1

(gdb) bt full
#0  0x00007ffff5012a6b in g_logv (breakpoint=1) at /build/glib2.0-wnDt2X/glib2.0-2.48.1/./glib/gmessages.c:325
        domain = 0x0
        data = 0x0
        depth = 1
        log_func = 0x7ffff5012230 <g_log_default_handler>
        domain_fatal_mask = <optimized out>
        masquerade_fatal = 0
        test_level = <optimized out>
        was_fatal = <optimized out>
        was_recursion = <optimized out>
        msg = 0x94f510 "The program 'notification-area-applet' received an X Window System error.\nThis probably reflects a bug in the program.\nThe error was 'BadPixmap (invalid Pixmap parameter)'.\n  (Details: serial 3595 err"...
        msg_alloc = 0x94f510 "The program 'notification-area-applet' received an X Window System error.\nThis probably reflects a bug in the program.\nThe error was 'BadPixmap (invalid Pixmap parameter)'.\n  (Details: serial 3595 err"...
        i = 2
#1  0x00007ffff5012a6b in g_logv (log_domain=0x7ffff66fd04e "Gdk", log_level=G_LOG_LEVEL_ERROR, format=<optimized out>, args=args@entry=0x7fffffffd7b0)
    at /build/glib2.0-wnDt2X/glib2.0-2.48.1/./glib/gmessages.c:1080
        domain = 0x0
        data = 0x0
        depth = 1
        log_func = 0x7ffff5012230 <g_log_default_handler>
        domain_fatal_mask = <optimized out>
        masquerade_fatal = 0
        test_level = <optimized out>
        was_fatal = <optimized out>
        was_recursion = <optimized out>
        msg = 0x94f510 "The program 'notification-area-applet' received an X Window System error.\nThis probably reflects a bug in the program.\nThe error was 'BadPixmap (invalid Pixmap parameter)'.\n  (Details: serial 3595 err"...
        msg_alloc = 0x94f510 "The program 'notification-area-applet' received an X Window System error.\nThis probably reflects a bug in the program.\nThe error was 'BadPixmap (invalid Pixmap parameter)'.\n  (Details: serial 3595 err"...
        i = 2
#2  0x00007ffff5012bdf in g_log (log_domain=log_domain@entry=0x7ffff66fd04e "Gdk", log_level=log_level@entry=G_LOG_LEVEL_ERROR, format=format@entry=0x7ffff671a961 "%s") at /build/glib2.0-wnDt2X/glib2.0-2.48.1/./glib/gmessages.c:1119
Python Exception <class 'gdb.error'> Attempt to dereference a generic pointer.:
#3  0x00007ffff66c7d88 in _gdk_x11_display_error_event (display=display@entry=0x63c020 [GdkX11Display], error=error@entry=0x7fffffffd970)
    at /build/gtk+3.0-UYMeaD/gtk+3.0-3.20.6/./gdk/x11/gdkdisplay-x11.c:2576
        buf = "BadPixmap (invalid Pixmap parameter)", '\000' <repeats 27 times>
        msg = <optimized out>
        display_x11 = 0x63c020 [GdkX11Display]
        tmp_list = <optimized out>
        ignore = 0
#4  0x00007ffff66d4099 in gdk_x_error (xdisplay=0x629800, error=0x7fffffffd970) at /build/gtk+3.0-UYMeaD/gtk+3.0-3.20.6/./gdk/x11/gdkmain-x11.c:307
        error_display = 0x63c020 [GdkX11Display]
        manager = <optimized out>
        displays = 0x7591a0
        error = 0x7fffffffd970
        xdisplay = 0x629800
#5  0x00007ffff78cd46d in _XError (dpy=dpy@entry=0x629800, rep=rep@entry=0x981f40) at ../../src/XlibInt.c:1429
        rtn_val = <optimized out>
        event =
            {type = 0, xany = {type = 0, serial = 6461440, send_event = 50331926, display = 0xe0b, window = 140737471591940}, xkey = {type = 0, serial = 6461440, send_event = 50331926, display = 0xe0b, window = 140737471591940, root = 140737297544261, subwindow = 140737488345544, time = 6466128, x = 3596, y = 0, x_root = -9712, y_root = 32767, state = 4294957792, keycode = 32767, same_screen = -190809007}, xbutton = {type = 0, serial = 6461440, send_event = 50331926,---Type <return> to continue, or q <return> to quit---
 display = 0xe0b, window = 140737471591940, root = 140737297544261, subwindow = 140737488345544, time = 6466128, x = 3596, y = 0, x_root = -9712, y_root = 32767, state = 4294957792, button = 32767, same_screen = -190809007}, xmotion = {type = 0, serial = 6461440, send_event = 50331926, display = 0xe0b, window = 140737471591940, root = 140737297544261, subwindow = 140737488345544, time = 6466128, x = 3596, y = 0, x_root = -9712, y_root = 32767, state = 4294957792, is_hint = -1 '\377', same_screen = -190809007}, xcrossing = {type = 0, serial = 6461440, send_event = 50331926, display = 0xe0b, window = 140737471591940, root = 140737297544261, subwindow = 140737488345544, time = 6466128, x = 3596, y = 0, x_root = -9712, y_root = 32767, mode = -9504, detail = 32767, same_screen = -190809007, focus = 32767, state = 4294957544}, xfocus = {type = 0, serial = 6461440, send_event = 50331926, display = 0xe0b, window = 140737471591940, mode = -190811067, detail = 32767}, xexpose = {type = 0, serial = 6461440, send_event = 50331926, display = 0xe0b, window = 140737471591940, x = -190811067, y = 32767, width = -9784, height = 32767, count = 6466128}, xgraphicsexpose = {type = 0, serial = 6461440, send_event = 50331926, display = 0xe0b, drawable = 140737471591940, x = -190811067, y = 32767, width = -9784, height = 32767, count = 6466128, major_code = 0, minor_code = 3596}, xnoexpose = {type = 0, serial = 6461440, send_event = 50331926, display = 0xe0b, drawable = 140737471591940, major_code = -190811067, minor_code = 32767}, xvisibility = {type = 0, serial = 6461440, send_event = 50331926, display = 0xe0b, window = 140737471591940, state = -190811067}, xcreatewindow = {type = 0, serial = 6461440, send_event = 50331926, display = 0xe0b, parent = 140737471591940, window = 140737297544261, x = -9784, y = 32767, width = 6466128, height = 0, border_width = 3596, override_redirect = 0}, xdestroywindow = {type = 0, serial = 6461440, send_event = 50331926, display = 0xe0b, event = 140737471591940, window = 140737297544261}, xunmap = {type = 0, serial = 6461440, send_event = 50331926, display = 0xe0b, event = 140737471591940, window = 140737297544261, from_configure = -9784}, xmap = {type = 0, serial = 6461440, send_event = 50331926, display = 0xe0b, event = 140737471591940, window = 140737297544261, override_redirect = -9784}, xmaprequest = {type = 0, serial = 6461440, send_event = 50331926, display = 0xe0b, parent = 140737471591940, window = 140737297544261}, xreparent = {type = 0, serial = 6461440, send_event = 50331926, display = 0xe0b, event = 140737471591940, window = 140737297544261, parent = 140737488345544, x = 6466128, y = 0, override_redirect = 3596}, xconfigure = {type = 0, serial = 6461440, send_event = 50331926, display = 0xe0b, event = 140737471591940, window = 140737297544261, x = -9784, y = 32767, width = 6466128, height = 0, border_width = 3596, above = 140737488345616, override_redirect = -9504}, xgravity = {type = 0, serial = 6461440, send_event = 50331926, display = 0xe0b, event = 140737471591940, window = 140737297544261, x = -9784, y = 32767}, xresizerequest = {type = 0, serial = 6461440, send_event = 50331926, display = 0xe0b, window = 140737471591940, width = -190811067, height = 32767}, xconfigurerequest = {type = 0, serial = 6461440, send_event = 50331926, display = 0xe0b, parent = 140737471591940, window = 140737297544261, x = -9784, y = 32767, width = 6466128, height = 0, border_width = 3596, above = 140737488345616, detail = -9504, value_mask = 140737297546321}, xcirculate = {type = 0, serial = 6461440, send_event = 50331926, display = 0xe0b, event = 140737471591940, window = 140737297544261, place = -9784}, xcirculaterequest = {type = 0, serial = 6461440, send_event = 50331926, display = 0xe0b, parent = 140737471591940, window = 140737297544261, place = -9784}, xproperty = {type = 0, serial = 6461440, send_event = 50331926, display = 0xe0b, window = 140737471591940, atom = 140737297544261, time = 140737488345544, state = 6466128}, xselectionclear = {type = 0, serial = 6461440, send_event = 50331926, display = 0xe0b, window = 140737471591940, selection = 140737297544261, time = 140737488345544}, xselectionrequest = {type = 0, serial = 6461440, send_event = 50331926, display = 0xe0b, owner = 140737471591940, requestor = 140737297544261, selection = 140737488345544, target = 6466128, property = 3596, time = 140737488345616}, xselection = {type = 0, serial = 6461440, send_event = 50331926, display = 0xe0b, requestor = 140737471591940, selection = 140737297544261, target = 140737488345544, property = 6466128, time = 3596}, xcolormap = {type = 0, serial = 6461440, send_event = 50331926, display = 0xe0b, window = 140737471591940, colormap = 140737297544261, new = -9784, state = 32767}, xclient = {type = 0, serial = 6461440, send_event = 50331926, display = 0xe0b, window = 140737471591940, message_type = 140737297544261, format = -9784, data = {b = "P\252b\000\000\000\000\000\f\016\000\000\000\000\000\000\020\332\377\377", s = {-21936, 98, 0, 0, 3596, 0, 0, 0, -9712, -1}, l = {6466128, 3596, 140737488345616, 140737488345824, 140737297546321}}}, xmapping = {type = 0, serial = 6461440, send_event = 50331926, display = 0xe0b, window = 140737471591940, request = -190811067, first_keycode = 32767, count = -9784}, xerror = {type = 0, display = 0x629800, resourceid = 50331926, serial = 3595, error_code = 4 '\004', request_code = 54 '6', minor_code = 0 '\000'}, xkeymap = {type = 0, serial = 6461440, send_event = 50331926, display = 0xe0b, window = 140737471591940, key_vector = "Et\240\364\377\177\000\000\310\331\377\377\377\177\000\000P\252b\000\000\000\000\000\f\016\000\000\000\000\000"}, xgeneric = {type = 0, serial = 6461440, send_event = 50331926, display = 0xe0b, extension = -16763388, evtype = 32767}, xcookie = {type = 0, serial = 6461440, send_event = 50331926, display = 0xe0b, extension = -16763388, evtype = 32767, cookie = 4104156229, data = 0x7fffffffd9c8}, pad = {140733193388032, 6461440, 50331926, 3595, 140737471591940, 140737297544261, 140737488345544, 6466128, 3596, 140737488345616, 140737488345824, 140737297546321, 140737488345576, 140737297546629, 3, 9662464, 3596, 140737488345616, 0, 0, 1, -1, 0, 0}}
        async = <optimized out>
        next = <optimized out>
#6  0x00007ffff78ca3a7 in handle_error (dpy=0x629800, err=0x981f40, in_XReply=<optimized out>) at ../../src/xcb_io.c:213
        ext = <optimized out>
        ret_code = 0
#7  0x00007ffff78ca465 in handle_response (dpy=dpy@entry=0x629800, response=0x981f40, in_XReply=in_XReply@entry=1) at ../../src/xcb_io.c:325
        async = <optimized out>
        next = <optimized out>
#8  0x00007ffff78cb420 in _XReply (dpy=dpy@entry=0x629800, rep=rep@entry=0x7fffffffdb30, extra=extra@entry=0, discard=discard@entry=1)
    at ../../src/xcb_io.c:627
        event = <optimized out>
        req = 0x984cc0
---Type <return> to continue, or q <return> to quit---
        response = 0x937000
        error = 0x0
        c = 0x62aa50
        reply = <optimized out>
        current = 0x984cc0
        __PRETTY_FUNCTION__ = "_XReply"
#9  0x00007ffff78c6cad in XSync (dpy=0x629800, discard=discard@entry=0) at ../../src/Sync.c:44
        rep =
          {type = 3 '\003', revertTo = 0 '\000', sequenceNumber = 0, length = 65537, focus = 1, pad1 = 0, pad2 = 4294957904, pad3 = 32767, pad4 = 1117012736, pad5 = 2855619860}
#10 0x00007ffff78c6d4b in _XSyncFunction (dpy=<optimized out>) at ../../src/Synchro.c:35
#11 0x00007ffff78ae352 in XFreePixmap (dpy=0x629800, pixmap=50331926) at ../../src/FreePix.c:41
        req = <optimized out>
#12 0x00007ffff5b7392d in _cairo_xlib_shm_surface_finish (abstract_surface=0x949000) at ../../../../src/cairo-xlib-surface-shm.c:730
        display = 0x982910
        status = <optimized out>
#13 0x00007ffff5b41076 in _cairo_surface_finish (surface=0x949000) at ../../../../src/cairo-surface.c:1030
        status = <optimized out>
#14 0x00007ffff5b41c57 in INT_cairo_surface_finish (surface=0x949000) at ../../../../src/cairo-surface.c:1077
        surface = 0x949000
#15 0x00007ffff5b7026f in _cairo_xlib_surface_discard_shm (surface=surface@entry=0x958870) at ../../../../src/cairo-xlib-surface.c:372
#16 0x00007ffff5b70575 in _cairo_xlib_surface_finish (abstract_surface=0x958870) at ../../../../src/cairo-xlib-surface.c:402
        surface = 0x958870
        status = CAIRO_STATUS_SUCCESS
        display = 0x982910
#17 0x00007ffff5b41076 in _cairo_surface_finish (surface=0x958870) at ../../../../src/cairo-surface.c:1030
        status = <optimized out>
#18 0x00007ffff5b41a10 in INT_cairo_surface_destroy (surface=0x958870) at ../../../../src/cairo-surface.c:968
        __PRETTY_FUNCTION__ = "cairo_surface_destroy"
#19 0x00007ffff5b22381 in _cairo_pattern_fini (pattern=pattern@entry=0x98e840) at ../../../../src/cairo-pattern.c:443
        surface_pattern = 0x98e840
#20 0x00007ffff5b22f08 in INT_cairo_pattern_destroy (pattern=0x98e840) at ../../../../src/cairo-pattern.c:1131
        type = CAIRO_PATTERN_TYPE_SURFACE
#21 0x00007ffff5afdfab in _cairo_gstate_fini (gstate=gstate@entry=0x983ed0) at ../../../../src/cairo-gstate.c:225
#22 0x00007ffff5af9f8d in _cairo_default_context_fini (cr=cr@entry=0x983ea0) at ../../../../src/cairo-default-context.c:75
#23 0x00007ffff5afa01d in _cairo_default_context_destroy (abstract_cr=0x983ea0) at ../../../../src/cairo-default-context.c:93
        cr = 0x983ea0
#24 0x00007ffff7bd4b61 in mate_panel_applet_get_background (y=0, x=1061, xid=<optimized out>, applet=<optimized out>) at mate-panel-applet.c:1522
        surface = 0x780c30
        window = <optimized out>
        width = <optimized out>
        height = 24
        cr = 0x983ea0
        pattern = 0x984d80
        pixmap_id = <optimized out>
        x = 1061
        y = 0
        retval = PANEL_NO_BACKGROUND
        elements = <optimized out>
#25 0x00007ffff7bd4b61 in mate_panel_applet_get_background (pattern=0x7fffffffdf18, color=<optimized out>, applet=<optimized out>)
    at mate-panel-applet.c:1604
        pixmap_id = <optimized out>
---Type <return> to continue, or q <return> to quit---
        x = 1061
        y = 0
        retval = PANEL_NO_BACKGROUND
        elements = <optimized out>
#26 0x00007ffff7bd4b61 in mate_panel_applet_get_background (applet=<optimized out>, color=<optimized out>, pattern=0x7fffffffdf18)
    at mate-panel-applet.c:1656
#27 0x00007ffff7bd4bbd in mate_panel_applet_handle_background (applet=applet@entry=0x69a200 [NaTrayApplet]) at mate-panel-applet.c:1726
        type = <optimized out>
        color = {red = 0, green = 0, blue = 0, alpha = 0}
        pattern = 0x0
        __func__ = "mate_panel_applet_handle_background"
#28 0x00007ffff7bd4f86 in mate_panel_applet_set_background_string (applet=0x69a200 [NaTrayApplet], background=0x7fffe400c2f8 "pixmap:25169875,1061,0")
    at mate-panel-applet.c:1675
        background = 0x7fffe400c2f8 "pixmap:25169875,1061,0"
        applet = 0x69a200 [NaTrayApplet]
#29 0x00007ffff7bd5125 in set_property_cb (connection=<optimized out>, sender=<optimized out>, object_path=object_path@entry=0x7fffe40040a0 "/org/mate/panel/applet/NotificationArea/0", interface_name=interface_name@entry=0x70d630 "org.mate.panel.applet.Applet", property_name=property_name@entry=0x7fffe400c2ed "Background", value=value@entry=0x7fffe400b060, error=0x7fffffffdfe8, user_data=0x69a200) at mate-panel-applet.c:2429
        applet = 0x69a200 [NaTrayApplet]
#30 0x00007ffff55fb1a8 in invoke_set_property_in_idle_cb (_data=0x7fffe4006390) at /build/glib2.0-wnDt2X/glib2.0-2.48.1/./gio/gdbusconnection.c:4169
        error = 0x0
        reply = <optimized out>
        value = 0x7fffe400b060
        __func__ = "invoke_set_property_in_idle_cb"
#31 0x00007ffff500c05a in g_main_context_dispatch (context=0x653670) at /build/glib2.0-wnDt2X/glib2.0-2.48.1/./glib/gmain.c:3154
        dispatch = 0x7ffff5008b10 <g_idle_dispatch>
        prev_source = 0x0
        was_in_call = 0
        user_data = 0x7fffe4006390
        callback = 0x7ffff55fb100 <invoke_set_property_in_idle_cb>
        cb_funcs = <optimized out>
        cb_data = 0x7fffe400ae00
        need_destroy = <optimized out>
        source = 0x7fffe400af50
        current = 0x618340
        i = 0
#32 0x00007ffff500c05a in g_main_context_dispatch (context=context@entry=0x653670) at /build/glib2.0-wnDt2X/glib2.0-2.48.1/./glib/gmain.c:3769
#33 0x00007ffff500c400 in g_main_context_iterate (context=0x653670, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>)
    at /build/glib2.0-wnDt2X/glib2.0-2.48.1/./glib/gmain.c:3840
        max_priority = 2147483647
        timeout = 13
        some_ready = 1
        nfds = <optimized out>
        allocated_nfds = 2
        fds = 0x691e00
#34 0x00007ffff500c722 in g_main_loop_run (loop=0x667dc0) at /build/glib2.0-wnDt2X/glib2.0-2.48.1/./glib/gmain.c:4034
        __func__ = "g_main_loop_run"
#35 0x00007ffff6b6a7d5 in gtk_main () at /build/gtk+3.0-UYMeaD/gtk+3.0-3.20.6/./gtk/gtkmain.c:1269
        loop = 0x667dc0
#36 0x00007ffff7bd5683 in mate_panel_applet_factory_main (factory_id=factory_id@entry=0x40aea3 "NotificationAreaAppletFactory", out_process=out_process@entry=1, applet_type=6868608, callback=callback@entry=0x406030 <applet_factory>, user_data=user_data@entry=0x0) at mate-panel-applet.c:2593
        factory = 0x665440 [MatePanelAppletFactory]
---Type <return> to continue, or q <return> to quit---
        closure = 0x68d000
        __func__ = "mate_panel_applet_factory_main"
#37 0x0000000000405a0e in main (argc=1, argv=0x7fffffffe2b8) at main.c:426
        context = 0x61cf30
        error = 0x0
        retval = <optimized out>
(gdb)