Using wily the unity-panel-service log has several of those lines
"Source ID ... was not found when attempting to remove it"
closing a nautilus window seems to trigger one of those, backtrace
"Source ID %u was not found when attempting to remove it") at /build/glib2.0-3T9duX/glib2.0-2.46.0/./glib/gmessages.c:1115
#1 0xffffffff in g_source_remove (tag=1235)
at /build/glib2.0-3T9duX/glib2.0-2.46.0/./glib/gmain.c:2284
#2 0x08052139 in on_entry_removed (object=0x9eb4198 [IndicatorAppmenu], entry=0x9f56dd0, self=0x9ec2158 [PanelService])
at /build/unity-tfB2IU/unity-7.3.2+15.10.20150921/services/panel-service.c:1337
#7 0xffffffff in <emit signal 0xb4e445fd "entry-removed" on instance 0x9eb4198 [IndicatorAppmenu]> (instance=0x9eb4198, detailed_signal=0xb4e445fd "entry-removed") at /build/glib2.0-3T9duX/glib2.0-2.46.0/./gobject/gsignal.c:3479
#3 0xffffffff in g_cclosure_marshal_VOID__POINTER (closure=0x9f5de80, return_value=0x0, n_param_values=2, param_values=0xbfca8010, invocation_hint=0xbfca7fb4, marshal_data=0x0)
at /build/glib2.0-3T9duX/glib2.0-2.46.0/./gobject/gmarshal.c:1988
#4 0xffffffff in g_closure_invoke (closure=0x9f5de80, return_value=0x0, n_param_values=2, param_values=0xbfca8010, invocation_hint=0xbfca7fb4)
at /build/glib2.0-3T9duX/glib2.0-2.46.0/./gobject/gclosure.c:801
#5 0xffffffff in signal_emit_unlocked_R (node=node@entry=0x9f5f9b8, detail=detail@entry=0, instance=instance@entry=0x9eb4198, emission_return=0x0, instance_and_params=0xbfca8010)
at /build/glib2.0-3T9duX/glib2.0-2.46.0/./gobject/gsignal.c:3627
#6 0xffffffff in g_signal_emit_valist (instance=0x9eb4198, signal_id=210, detail=0, var_args=0xbfca81fc "\313\340\343\264HN\367\t\320m\365\t`؛\266\260؛\266HN\367\t\320m\365\t\230A\353\t")
at /build/glib2.0-3T9duX/glib2.0-2.46.0/./gobject/gsignal.c:3383
#8 0xffffffff in window_entry_removed (mw=0x9f74e48 [WindowMenuModel], entry=0x9f56dd0, iapp=0x9eb4198 [IndicatorAppmenu]) at indicator-appmenu.c:1366
#9 0xffffffff in g_cclosure_marshal_VOID__POINTERv (closure=0x9f503c8, return_value=0x0, instance=0x9f74e48, args=0xbfca8458 "\320m\365\t", marshal_data=0x0, n_params=1, param_types=0x9ffde98)
at /build/glib2.0-3T9duX/glib2.0-2.46.0/./gobject/gmarshal.c:2026
#10 0xffffffff in _g_closure_invoke_va (closure=0x9f503c8, return_value=0x0, instance=0x9f74e48, args=0xbfca8458 "\320m\365\t", n_params=1, param_types=0x9ffde98) at /build/glib2.0-3T9duX/glib2.0-2.46.0/./gobject/gclosure.c:864
#11 0xffffffff in g_signal_emit_valist (instance=0x9f74e48, signal_id=326, detail=0, var_args=0xbfca8458 "\320m\365\t")
at /build/glib2.0-3T9duX/glib2.0-2.46.0/./gobject/gsignal.c:3292
#12 0xffffffff in g_signal_emit_by_name (instance=0x9f74e48, detailed_signal=0xb4e445fd "entry-removed")
at /build/glib2.0-3T9duX/glib2.0-2.46.0/./gobject/gsignal.c:3479
#13 0xffffffff in item_removed_cb (menu=0xa005118 [GtkMenuBar], widget=0xa0a1798 [GtkModelMenuItem], data=0x9f74e48) at window-menu-model.c:393
#18 0xffffffff in <emit signal ??? on instance 0xa005118 [GtkMenuBar]> (instance=0xa005118, signal_id=73, detail=0)
at /build/glib2.0-3T9duX/glib2.0-2.46.0/./gobject/gsignal.c:3439
#14 0xffffffff in g_cclosure_marshal_VOID__OBJECT (closure=0xa085810, return_value=0x0, n_param_values=2, param_values=0xbfca8600, invocation_hint=0xbfca85a4, marshal_data=0x0)
at /build/glib2.0-3T9duX/glib2.0-2.46.0/./gobject/gmarshal.c:2062
#15 0xffffffff in g_closure_invoke (closure=0xa085810, return_value=0x0, n_param_values=2, param_values=0xbfca8600, invocation_hint=0xbfca85a4)
at /build/glib2.0-3T9duX/glib2.0-2.46.0/./gobject/gclosure.c:801
#16 0xffffffff in signal_emit_unlocked_R (node=node@entry=0x9e77b10, detail=detail@entry=0, instance=instance@entry=0xa005118, emission_return=0x0, instance_and_params=0xbfca8600)
at /build/glib2.0-3T9duX/glib2.0-2.46.0/./gobject/gsignal.c:3627
#17 0xffffffff in g_signal_emit_valist (instance=0xa005118, signal_id=73, detail=0, var_args=0xbfca8770 "\230\027\n\nH\251\346\t")
at /build/glib2.0-3T9duX/glib2.0-2.46.0/./gobject/gsignal.c:3383
#19 0xffffffff in gtk_container_remove (container=0xa005118 [GtkMenuBar], widget=0xa0a1798 [GtkModelMenuItem])
at /build/gtk+3.0-78a2wN/gtk+3.0-3.16.7/./gtk/gtkcontainer.c:1733
#20 0xffffffff in gtk_widget_dispose (object=0xa0a1798 [GtkModelMenuItem])
at /build/gtk+3.0-78a2wN/gtk+3.0-3.16.7/./gtk/gtkwidget.c:11956
#21 0xffffffff in gtk_menu_item_dispose (object=0xa0a1798 [GtkModelMenuItem])
at /build/gtk+3.0-78a2wN/gtk+3.0-3.16.7/./gtk/gtkmenuitem.c:637
#22 0xffffffff in g_object_run_dispose (object=0xa0a1798 [GtkModelMenuItem])
at /build/glib2.0-3T9duX/glib2.0-2.46.0/./gobject/gobject.c:1081
#23 0xffffffff in gtk_widget_destroy (widget=0xa0a1798 [GtkModelMenuItem])
at /build/gtk+3.0-78a2wN/gtk+3.0-3.16.7/./gtk/gtkwidget.c:4794
#24 0xffffffff in gtk_menu_shell_tracker_remove_func (position=0, user_data=0xa005118) at /build/gtk+3.0-78a2wN/gtk+3.0-3.16.7/./gtk/gtkmenushell.c:2046
#25 0xffffffff in gtk_menu_tracker_model_changed (tracker=0xb430d030, tracker=0xb430d030, n_items=1, offset=<optimized out>, change_point=0xb4312f84)
at /build/gtk+3.0-78a2wN/gtk+3.0-3.16.7/./gtk/gtkmenutracker.c:297
#26 0xffffffff in gtk_menu_tracker_model_changed (model=0xa16d6a0 [GDBusMenuModel], position=0, removed=1, added=0, user_data=0xb430d030)
at /build/gtk+3.0-78a2wN/gtk+3.0-3.16.7/./gtk/gtkmenutracker.c:451
#27 0xffffffff in ffi_call_SYSV () at ../src/x86/sysv.S:65
#28 0xffffffff in ffi_call (cif=0xbfca8a04, fn=0xb6f21db0 <gtk_menu_tracker_model_changed>, rvalue=0xbfca8980, avalue=0xbfca8920) at ../src/x86/ffi.c:389
#33 0xffffffff in <emit signal ??? on instance 0xa16d6a0 [GDBusMenuModel]> (instance=0xa16d6a0, signal_id=333, detail=0)
at /build/glib2.0-3T9duX/glib2.0-2.46.0/./gobject/gsignal.c:3439
#29 0xffffffff in g_cclosure_marshal_generic (closure=0xa0996c0, return_gvalue=0x0, n_param_values=4, param_values=0xbfca8ba0, invocation_hint=0xbfca8b44, marshal_data=0x0)
at /build/glib2.0-3T9duX/glib2.0-2.46.0/./gobject/gclosure.c:1487
#30 0xffffffff in g_closure_invoke (closure=0xa0996c0, return_value=0x0, n_param_values=4, param_values=0xbfca8ba0, invocation_hint=0xbfca8b44)
at /build/glib2.0-3T9duX/glib2.0-2.46.0/./gobject/gclosure.c:801
#31 0xffffffff in signal_emit_unlocked_R (node=node@entry=0x9ffdf20, detail=detail@entry=0, instance=instance@entry=0xa16d6a0, emission_return=0x0, instance_and_params=0xbfca8ba0)
at /build/glib2.0-3T9duX/glib2.0-2.46.0/./gobject/gsignal.c:3627
#32 0xffffffff in g_signal_emit_valist (instance=0xa16d6a0, signal_id=333, detail=0, var_args=0xbfca8d38 "y\263\213\266")
at /build/glib2.0-3T9duX/glib2.0-2.46.0/./gobject/gsignal.c:3383
#34 0xffffffff in g_menu_model_items_changed (model=0xa16d6a0 [GDBusMenuModel], position=0, removed=1, added=0)
at /build/glib2.0-3T9duX/glib2.0-2.46.0/./gio/gmenumodel.c:690
#35 0xffffffff in g_dbus_menu_group_changed (added=0, removed=1, position=0, items=0x0, proxy=<optimized out>)
at /build/glib2.0-3T9duX/glib2.0-2.46.0/./gio/gdbusmenumodel.c:832
#36 0xffffffff in g_dbus_menu_group_changed (group=0xa0ecd60, menu_id=0, position=0, removed=1, added=0xb4339050)
at /build/glib2.0-3T9duX/glib2.0-2.46.0/./gio/gdbusmenumodel.c:635
#37 0xffffffff in g_dbus_menu_path_signal (connection=0x9eb4048 [GDBusConnection], sender_name=0xb431ed58 ":1.59", object_path=0xb43104f8 "/com/canonical/unity/gtk/window/10", interface_name=0xb432fd50 "org.gtk.Menus", signal_name=0xb431e668 "Changed", parameters=0xb4336c78, user_data=0xb4334230)
at /build/glib2.0-3T9duX/glib2.0-2.46.0/./gio/gdbusmenumodel.c:298
#38 0xffffffff in emit_signal_instance_in_idle_cb (data=0xb43224b0)
at /build/glib2.0-3T9duX/glib2.0-2.46.0/./gio/gdbusconnection.c:3701
#39 0xffffffff in g_idle_dispatch (source=0xb431fe90, callback=0xb6ad4d50 <emit_signal_instance_in_idle_cb>, user_data=0xb43224b0)
at /build/glib2.0-3T9duX/glib2.0-2.46.0/./glib/gmain.c:5441
#40 0xffffffff in g_main_context_dispatch (context=0x9ea4098)
at /build/glib2.0-3T9duX/glib2.0-2.46.0/./glib/gmain.c:3154
#41 0xffffffff in g_main_context_dispatch (context=0x9ea4098)
at /build/glib2.0-3T9duX/glib2.0-2.46.0/./glib/gmain.c:3769
#42 0xffffffff in g_main_context_iterate (context=0x9ea4098, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>)
at /build/glib2.0-3T9duX/glib2.0-2.46.0/./glib/gmain.c:3840
#43 0xffffffff in g_main_loop_run (loop=0x9f73e38)
at /build/glib2.0-3T9duX/glib2.0-2.46.0/./glib/gmain.c:4034
#44 0xffffffff in gtk_main ()
at /build/gtk+3.0-78a2wN/gtk+3.0-3.16.7/./gtk/gtkmain.c:1219
This bug was fixed in the package unity - 7.4.0+16.
---------------
unity (7.4.0+
[ Marco Trevisan (Treviño) ]
* Bumping version to 7.4.0
* Fix building in xenial
[ Didier Roche ]
* Remove unity2d transitional packages. We are post trusty LTS, they
are not needed anymore
[ Marco Trevisan (Treviño) ]
* ApplicationLaun
file, add QL item to add to dash
* PanelService: unset the idle ID before removal on callback (LP:
#1501289)
* Unity: use compiz cursorCache to get properly updated cursors (LP:
#1359211)
* UnityScreen: add SpreadAppWindows option and trigger it on
Super+
[ Stephen M. Webb ]
* changed the wording of the help message and warning message for the
--reset option (LP: #1486498)
unity (7.3.3-0ubuntu1) UNRELEASED; urgency=medium
* Releasing Unity 7.3.3
-- Marco Trevisan (Treviño) <mail@3v1n0.net> Mon, 02 Nov 2015 13:29:58 +0000