A few weeks' crash-free running with "UBUNTU_MENUPROXY= freeciv-gtk2"
has pretty much proven that this only happens with appmenu active.

I seem not to have attached the backtrace I intended to. Here it is
(from a .crash file on the user's system, manually apport-retrace'd by
me).

Stacktrace:
 #0  0x00007f9afedfb037 in __GI_raise (sig=sig@entry=6) at 
../nptl/sysdeps/unix/sysv/linux/raise.c:56
         resultvar = 0
         pid = 21498
         selftid = 21498
 #1  0x00007f9afedfe698 in __GI_abort () at abort.c:90
         save_stage = 2
         act = {__sigaction_handler = {sa_handler = 0x7fff050e66e0, 
sa_sigaction = 0x7fff050e66e0}, sa_mask = {__val = {140733278217856, 138, 
140303713758357, 4294967301, 0, 138, 140303677566184, 66998496, 138, 
140303684891056, 140303713785637, 161, 51, 140303681476504, 1, 0}}, sa_flags = 
0, sa_restorer = 0x20}
         sigs = {__val = {32, 0 <repeats 15 times>}}
 #2  0x00007f9aff1f73b6 in g_assertion_message 
(domain=domain@entry=0x7f9aff4c0a4e "GLib-GObject", 
file=file@entry=0x7f9aff4c5808 
"/build/buildd/glib2.0-2.36.0/./gobject/gsignal.c", line=line@entry=646, 
func=func@entry=0x7f9aff4c71b0 <__PRETTY_FUNCTION__.12149> "handler_unref_R", 
message=<optimised out>) at 
/build/buildd/glib2.0-2.36.0/./glib/gtestutils.c:1912
         lstr = 
"646\000\377\177\000\000\320b\016\005\377\177\000\000\000,\376\003\000\000\000\000\061lL\377\232\177\000"
         s = 0x3fe50e0 "P\270\067\004"
 #3  0x00007f9aff1f7914 in g_assertion_message_expr 
(domain=domain@entry=0x7f9aff4c0a4e "GLib-GObject", 
file=file@entry=0x7f9aff4c5808 
"/build/buildd/glib2.0-2.36.0/./gobject/gsignal.c", line=line@entry=646, 
func=func@entry=0x7f9aff4c71b0 <__PRETTY_FUNCTION__.12149> "handler_unref_R", 
expr=expr@entry=0x7f9aff4c6c31 "hlist->tail_after == handler") at 
/build/buildd/glib2.0-2.36.0/./glib/gtestutils.c:1923
         s = <optimised out>
 #4  0x00007f9aff493521 in handler_unref_R (handler=<optimised out>, 
instance=<optimised out>, signal_id=<optimised out>) at 
/build/buildd/glib2.0-2.36.0/./gobject/gsignal.c:646
 No locals.
 #5  0x00007f9aff4a8de2 in handler_unref_R (handler=0x431ca30, 
instance=0x407c210, signal_id=1) at 
/build/buildd/glib2.0-2.36.0/./gobject/gsignal.c:646
         _g_boolean_var_ = 0
         hlist = <optimised out>
 #6  g_signal_handler_disconnect (instance=0x407c210, handler_id=<optimised 
out>) at /build/buildd/glib2.0-2.36.0/./gobject/gsignal.c:2590
         handler = 0x431ca30
         signal_id = 1
         __PRETTY_FUNCTION__ = "g_signal_handler_disconnect"
 #7  0x00007f9af16db5a7 in ?? () from 
/home/jtn/apport-sandbox/usr/lib/x86_64-linux-gnu/libdbusmenu-gtk.so.4
 No symbol table info available.
 #8  0x00007f9af16db68e in ?? () from 
/home/jtn/apport-sandbox/usr/lib/x86_64-linux-gnu/libdbusmenu-gtk.so.4
 No symbol table info available.
 #9  0x00007f9aff1b9a90 in g_datalist_clear (datalist=0x0) at 
/build/buildd/glib2.0-2.36.0/./glib/gdataset.c:277
         data = 0x405fb70
         i = 0
         __PRETTY_FUNCTION__ = "g_datalist_clear"
 #10 0x00007f9aff49d538 in g_object_unref (_object=0x40d5400) at 
/build/buildd/glib2.0-2.36.0/./gobject/gobject.c:3024
         weak_locations = <optimised out>
         object = 0x40d5400
         old_ref = 1
         __PRETTY_FUNCTION__ = "g_object_unref"
 #11 0x00007f9af14bafa5 in ?? () from 
/home/jtn/apport-sandbox/usr/lib/x86_64-linux-gnu/libdbusmenu-glib.so.4
 No symbol table info available.
 #12 0x00007f9aff49d4a4 in g_object_unref (_object=0x3fe2c00) at 
/build/buildd/glib2.0-2.36.0/./gobject/gobject.c:2987
         weak_locations = 0x0
         object = 0x3fe2c00
         old_ref = <optimised out>
         __PRETTY_FUNCTION__ = "g_object_unref"
 #13 0x00007f9aff1c3bd3 in g_hash_table_remove_all_nodes (hash_table=0x405dea0, 
notify=<optimised out>) at /build/buildd/glib2.0-2.36.0/./glib/ghash.c:500
         i = <optimised out>
         key = <optimised out>
         value = 0x3fe2c00
 #14 0x00007f9aff1c4a81 in g_hash_table_remove_all 
(hash_table=hash_table@entry=0x405dea0) at 
/build/buildd/glib2.0-2.36.0/./glib/ghash.c:1347
         __PRETTY_FUNCTION__ = "g_hash_table_remove_all"
 #15 0x00007f9aff1c4aee in g_hash_table_destroy (hash_table=0x405dea0) at 
/build/buildd/glib2.0-2.36.0/./glib/ghash.c:1051
         __PRETTY_FUNCTION__ = "g_hash_table_destroy"
 #16 0x00007f9af14c19a7 in ?? () from 
/home/jtn/apport-sandbox/usr/lib/x86_64-linux-gnu/libdbusmenu-glib.so.4
 No symbol table info available.
 #17 0x00007f9aff49d538 in g_object_unref (_object=0x3e659b0) at 
/build/buildd/glib2.0-2.36.0/./gobject/gobject.c:3024
         weak_locations = <optimised out>
         object = 0x3e659b0
         old_ref = 1
         __PRETTY_FUNCTION__ = "g_object_unref"
 #18 0x00007f9af18e4d75 in ?? () from 
/home/jtn/apport-sandbox/usr/lib/x86_64-linux-gnu/gtk-2.0/2.10.0/menuproxies/libappmenu.so
 No symbol table info available.
 #19 0x00007f9af18e4dd9 in ?? () from 
/home/jtn/apport-sandbox/usr/lib/x86_64-linux-gnu/gtk-2.0/2.10.0/menuproxies/libappmenu.so
 No symbol table info available.
 #20 0x00007f9aff498620 in g_closure_invoke (closure=0x415a0b0, 
return_value=0x0, n_param_values=1, param_values=0x7fff050e66e0, 
invocation_hint=0x7fff050e6680) at 
/build/buildd/glib2.0-2.36.0/./gobject/gclosure.c:777
         marshal = 0x7f9aff49a450 <g_cclosure_marshal_VOID__VOID>
         marshal_data = 0x0
         in_marshal = 0
         real_closure = 0x415a090
         __PRETTY_FUNCTION__ = "g_closure_invoke"
 #21 0x00007f9aff4a9f00 in signal_emit_unlocked_R (node=node@entry=0x215ff50, 
detail=detail@entry=0, instance=instance@entry=0x3ed66c0, 
emission_return=emission_return@entry=0x0, 
instance_and_params=instance_and_params@entry=0x7fff050e66e0) at 
/build/buildd/glib2.0-2.36.0/./gobject/gsignal.c:3584
         tmp = <optimised out>
         handler = 0x3efb410
         accumulator = 0x0
         emission = {next = 0x7fff050e6b70, instance = 0x3ed66c0, ihint = 
{signal_id = 15, detail = 0, run_type = G_SIGNAL_RUN_FIRST}, state = 
EMISSION_RUN, chain_type = 4}
         class_closure = 0x2171710
         hlist = 0x3efb410
         handler_list = 0x3efb410
         return_accu = 0x0
         accu = {g_type = 0, data = {{v_int = 0, v_uint = 0, v_long = 0, 
v_ulong = 0, v_int64 = 0, v_uint64 = 0, v_float = 0, v_double = 0, v_pointer = 
0x0}, {v_int = 0, v_uint = 0, v_long = 0, v_ulong = 0, v_int64 = 0, v_uint64 = 
0, v_float = 0, v_double = 0, v_pointer = 0x0}}}
         signal_id = 15
         max_sequential_handler_number = 141382
         return_value_altered = 1
 #22 0x00007f9aff4b1d11 in g_signal_emit_valist (instance=0x3ed66c0, 
signal_id=<optimised out>, detail=0, var_args=var_args@entry=0x7fff050e6928) at 
/build/buildd/glib2.0-2.36.0/./gobject/gsignal.c:3328
         instance_and_params = 0x7fff050e66e0
         signal_return_type = 4
         param_values = 0x7fff050e66f8
         node = 0x215ff50
         i = <optimised out>
         n_params = 0
         __PRETTY_FUNCTION__ = "g_signal_emit_valist"
 #23 0x00007f9aff4b1f92 in g_signal_emit (instance=instance@entry=0x3ed66c0, 
signal_id=<optimised out>, detail=detail@entry=0) at 
/build/buildd/glib2.0-2.36.0/./gobject/gsignal.c:3384
         var_args = {{gp_offset = 24, fp_offset = 48, overflow_arg_area = 
0x7fff050e6a00, reg_save_area = 0x7fff050e6940}}
 #24 0x00007f9b00044aa7 in IA__gtk_widget_unmap (widget=0x3ed66c0) at 
/build/buildd/gtk+2.0-2.24.17/gtk/gtkwidget.c:3454
 No locals.
 #25 IA__gtk_widget_unmap (widget=widget@entry=0x3ed66c0) at 
/build/buildd/gtk+2.0-2.24.17/gtk/gtkwidget.c:3445
 No locals.
 #26 0x00007f9b00050cf0 in gtk_window_hide (widget=0x3ed66c0) at 
/build/buildd/gtk+2.0-2.24.17/gtk/gtkwindow.c:4589
         window = 0x3ed66c0
 #27 0x00007f9aff498620 in g_closure_invoke (closure=0x225ab20, 
return_value=0x0, n_param_values=1, param_values=0x7fff050e6be0, 
invocation_hint=0x7fff050e6b80) at 
/build/buildd/glib2.0-2.36.0/./gobject/gclosure.c:777
         marshal = 0x7f9aff497280 <g_type_class_meta_marshal>
         marshal_data = 0xc0
         in_marshal = 0
         real_closure = 0x225ab00
         __PRETTY_FUNCTION__ = "g_closure_invoke"
 #28 0x00007f9aff4a9544 in signal_emit_unlocked_R (node=node@entry=0x2150380, 
detail=detail@entry=0, instance=instance@entry=0x3ed66c0, 
emission_return=emission_return@entry=0x0, 
instance_and_params=instance_and_params@entry=0x7fff050e6be0) at 
/build/buildd/glib2.0-2.36.0/./gobject/gsignal.c:3514
         accumulator = 0x0
         emission = {next = 0x7fff050e70e0, instance = 0x3ed66c0, ihint = 
{signal_id = 13, detail = 0, run_type = G_SIGNAL_RUN_FIRST}, state = 
EMISSION_RUN, chain_type = 35866176}
         class_closure = 0x225ab20
         hlist = 0x0
         handler_list = <optimised out>
         return_accu = 0x0
         accu = {g_type = 0, data = {{v_int = 0, v_uint = 0, v_long = 0, 
v_ulong = 0, v_int64 = 0, v_uint64 = 0, v_float = 0, v_double = 0, v_pointer = 
0x0}, {v_int = 0, v_uint = 0, v_long = 0, v_ulong = 0, v_int64 = 0, v_uint64 = 
0, v_float = 0, v_double = 0, v_pointer = 0x0}}}
         signal_id = 13
         max_sequential_handler_number = 141382
         return_value_altered = <optimised out>
 #29 0x00007f9aff4b1d11 in g_signal_emit_valist (instance=0x3ed66c0, 
signal_id=<optimised out>, detail=0, var_args=var_args@entry=0x7fff050e6e28) at 
/build/buildd/glib2.0-2.36.0/./gobject/gsignal.c:3328
         instance_and_params = 0x7fff050e6be0
         signal_return_type = 4
         param_values = 0x7fff050e6bf8
         node = 0x2150380
         i = <optimised out>
         n_params = 0
         __PRETTY_FUNCTION__ = "g_signal_emit_valist"
 #30 0x00007f9aff4b1f92 in g_signal_emit (instance=instance@entry=0x3ed66c0, 
signal_id=<optimised out>, detail=detail@entry=0) at 
/build/buildd/glib2.0-2.36.0/./gobject/gsignal.c:3384
         var_args = {{gp_offset = 24, fp_offset = 48, overflow_arg_area = 
0x7fff050e6f00, reg_save_area = 0x7fff050e6e40}}
 #31 0x00007f9b0004b7ee in IA__gtk_widget_hide (widget=0x3ed66c0) at 
/build/buildd/gtk+2.0-2.24.17/gtk/gtkwidget.c:3320
         toplevel = 0x3ed66c0
 #32 IA__gtk_widget_hide (widget=0x3ed66c0) at 
/build/buildd/gtk+2.0-2.24.17/gtk/gtkwidget.c:3308
 No locals.
 #33 0x00007f9afff34eaf in IA__gtk_menu_popdown (menu=menu@entry=0x3cc04f0) at 
/build/buildd/gtk+2.0-2.24.17/gtk/gtkmenu.c:1682
         private = <optimised out>
         menu_shell = 0x3cc04f0
         __PRETTY_FUNCTION__ = "IA__gtk_menu_popdown"
 #34 0x00007f9afff35009 in gtk_menu_deactivate (menu_shell=0x3cc04f0) at 
/build/buildd/gtk+2.0-2.24.17/gtk/gtkmenu.c:4198
         parent = 0x3ec5020
 #35 0x00007f9aff49881b in _g_closure_invoke_va (closure=0x2751ce0, 
return_value=0x0, instance=0x3cc04f0, args=0x7fff050e7228, n_params=0, 
param_types=0x0) at /build/buildd/glib2.0-2.36.0/./gobject/gclosure.c:840
         marshal = 0x7f9aff496c80 <g_type_class_meta_marshalv>
         marshal_data = 0x340
         in_marshal = 1
         real_closure = 0x2751cc0
         __PRETTY_FUNCTION__ = "_g_closure_invoke_va"
 #36 0x00007f9aff4b12df in g_signal_emit_valist (instance=0x3cc04f0, 
signal_id=<optimised out>, detail=0, var_args=var_args@entry=0x7fff050e7228) at 
/build/buildd/glib2.0-2.36.0/./gobject/gsignal.c:3234
         return_accu = 0x0
         accu = {g_type = 0, data = {{v_int = 0, v_uint = 0, v_long = 0, 
v_ulong = 0, v_int64 = 0, v_uint64 = 0, v_float = 0, v_double = 0, v_pointer = 
0x0}, {v_int = 0, v_uint = 0, v_long = 0, v_ulong = 0, v_int64 = 0, v_uint64 = 
0, v_float = 0, v_double = 0, v_pointer = 0x0}}}
         accumulator = 0x0
         emission = {next = 0x7fff050e7480, instance = 0x3cc04f0, ihint = 
{signal_id = 211, detail = 0, run_type = G_SIGNAL_RUN_FIRST}, state = 
EMISSION_RUN, chain_type = 36136352}
         signal_id = 211
         instance_type = <optimised out>
         emission_return = {g_type = 0, data = {{v_int = 0, v_uint = 0, v_long 
= 0, v_ulong = 0, v_int64 = 0, v_uint64 = 0, v_float = 0, v_double = 0, 
v_pointer = 0x0}, {v_int = 0, v_uint = 0, v_long = 0, v_ulong = 0, v_int64 = 0, 
v_uint64 = 0, v_float = 0, v_double = 0, v_pointer = 0x0}}}
         rtype = 4
         static_scope = 0
         fastpath_handler = <optimised out>
         closure = 0x2751ce0
         run_type = G_SIGNAL_RUN_FIRST
         hlist = 0x0
         l = <optimised out>
         fastpath = 0
         instance_and_params = <optimised out>
         signal_return_type = <optimised out>
         param_values = <optimised out>
         node = 0x27520d0
         i = <optimised out>
         n_params = <optimised out>
         __PRETTY_FUNCTION__ = "g_signal_emit_valist"
 #37 0x00007f9aff4b1f92 in g_signal_emit (instance=<optimised out>, 
signal_id=<optimised out>, detail=<optimised out>) at 
/build/buildd/glib2.0-2.36.0/./gobject/gsignal.c:3384
         var_args = {{gp_offset = 24, fp_offset = 48, overflow_arg_area = 
0x7fff050e7300, reg_save_area = 0x7fff050e7240}}
 #38 0x00007f9aff49881b in _g_closure_invoke_va (closure=0x2751ce0, 
return_value=0x0, instance=0x3cc0830, args=0x7fff050e75c8, n_params=0, 
param_types=0x0) at /build/buildd/glib2.0-2.36.0/./gobject/gclosure.c:840
         marshal = 0x7f9aff496c80 <g_type_class_meta_marshalv>
         marshal_data = 0x340
         in_marshal = 1
         real_closure = 0x2751cc0
         __PRETTY_FUNCTION__ = "_g_closure_invoke_va"
 #39 0x00007f9aff4b12df in g_signal_emit_valist (instance=0x3cc0830, 
signal_id=<optimised out>, detail=0, var_args=var_args@entry=0x7fff050e75c8) at 
/build/buildd/glib2.0-2.36.0/./gobject/gsignal.c:3234
         return_accu = 0x0
         accu = {g_type = 0, data = {{v_int = 0, v_uint = 0, v_long = 0, 
v_ulong = 0, v_int64 = 0, v_uint64 = 0, v_float = 0, v_double = 0, v_pointer = 
0x0}, {v_int = 0, v_uint = 0, v_long = 0, v_ulong = 0, v_int64 = 0, v_uint64 = 
0, v_float = 0, v_double = 0, v_pointer = 0x0}}}
         accumulator = 0x0
         emission = {next = 0x7fff050e7820, instance = 0x3cc0830, ihint = 
{signal_id = 211, detail = 0, run_type = G_SIGNAL_RUN_FIRST}, state = 
EMISSION_RUN, chain_type = 36136352}
         signal_id = 211
         instance_type = <optimised out>
         emission_return = {g_type = 0, data = {{v_int = 0, v_uint = 0, v_long 
= 0, v_ulong = 0, v_int64 = 0, v_uint64 = 0, v_float = 0, v_double = 0, 
v_pointer = 0x0}, {v_int = 0, v_uint = 0, v_long = 0, v_ulong = 0, v_int64 = 0, 
v_uint64 = 0, v_float = 0, v_double = 0, v_pointer = 0x0}}}
         rtype = 4
         static_scope = 0
         fastpath_handler = <optimised out>
         closure = 0x2751ce0
         run_type = G_SIGNAL_RUN_FIRST
         hlist = 0x0
         l = <optimised out>
         fastpath = 0
         instance_and_params = <optimised out>
         signal_return_type = <optimised out>
         param_values = <optimised out>
         node = 0x27520d0
         i = <optimised out>
         n_params = <optimised out>
         __PRETTY_FUNCTION__ = "g_signal_emit_valist"
 #40 0x00007f9aff4b1f92 in g_signal_emit (instance=<optimised out>, 
signal_id=<optimised out>, detail=<optimised out>) at 
/build/buildd/glib2.0-2.36.0/./gobject/gsignal.c:3384
         var_args = {{gp_offset = 24, fp_offset = 48, overflow_arg_area = 
0x7fff050e76a0, reg_save_area = 0x7fff050e75e0}}
 #41 0x00007f9aff4988e7 in _g_closure_invoke_va (closure=0x2751ce0, 
return_value=0x0, instance=0x4181c60, args=0x7fff050e7968, n_params=0, 
param_types=0x0) at /build/buildd/glib2.0-2.36.0/./gobject/gclosure.c:840
         marshal = 0x7f9aff496c80 <g_type_class_meta_marshalv>
         marshal_data = 0x340
         in_marshal = 0
         real_closure = 0x2751cc0
         __PRETTY_FUNCTION__ = "_g_closure_invoke_va"
 #42 0x00007f9aff4b12df in g_signal_emit_valist (instance=0x4181c60, 
signal_id=<optimised out>, detail=0, var_args=var_args@entry=0x7fff050e7968) at 
/build/buildd/glib2.0-2.36.0/./gobject/gsignal.c:3234
         return_accu = 0x0
         accu = {g_type = 0, data = {{v_int = 0, v_uint = 0, v_long = 0, 
v_ulong = 0, v_int64 = 0, v_uint64 = 0, v_float = 0, v_double = 0, v_pointer = 
0x0}, {v_int = 0, v_uint = 0, v_long = 0, v_ulong = 0, v_int64 = 0, v_uint64 = 
0, v_float = 0, v_double = 0, v_pointer = 0x0}}}
         accumulator = 0x0
         emission = {next = 0x7fff050e7c70, instance = 0x4181c60, ihint = 
{signal_id = 211, detail = 0, run_type = G_SIGNAL_RUN_FIRST}, state = 
EMISSION_RUN, chain_type = 36136352}
         signal_id = 211
         instance_type = <optimised out>
         emission_return = {g_type = 0, data = {{v_int = 0, v_uint = 0, v_long 
= 0, v_ulong = 0, v_int64 = 0, v_uint64 = 0, v_float = 0, v_double = 0, 
v_pointer = 0x0}, {v_int = 0, v_uint = 0, v_long = 0, v_ulong = 0, v_int64 = 0, 
v_uint64 = 0, v_float = 0, v_double = 0, v_pointer = 0x0}}}
         rtype = 4
         static_scope = 0
         fastpath_handler = <optimised out>
         closure = 0x2751ce0
         run_type = G_SIGNAL_RUN_FIRST
         hlist = 0x0
         l = <optimised out>
         fastpath = 0
         instance_and_params = <optimised out>
         signal_return_type = <optimised out>
         param_values = <optimised out>
         node = 0x27520d0
         i = <optimised out>
         n_params = <optimised out>
         __PRETTY_FUNCTION__ = "g_signal_emit_valist"
 #43 0x00007f9aff4b1f92 in g_signal_emit (instance=<optimised out>, 
signal_id=<optimised out>, detail=<optimised out>) at 
/build/buildd/glib2.0-2.36.0/./gobject/gsignal.c:3384
         var_args = {{gp_offset = 24, fp_offset = 48, overflow_arg_area = 
0x7fff050e7a40, reg_save_area = 0x7fff050e7980}}
 #44 0x00007f9afff3e555 in IA__gtk_menu_shell_activate_item 
(menu_shell=0x4181c60, menu_item=0x3ac54d0, force_deactivate=<optimised out>) 
at /build/buildd/gtk+2.0-2.24.17/gtk/gtkmenushell.c:1366
         parent_menu_shell = 0x0
         slist = <optimised out>
         shells = 0x408db70
         deactivate = <optimised out>
         __PRETTY_FUNCTION__ = "IA__gtk_menu_shell_activate_item"
 #45 0x00007f9afff3e8fc in gtk_menu_shell_button_release (widget=0x4181c60, 
event=<optimised out>) at /build/buildd/gtk+2.0-2.24.17/gtk/gtkmenushell.c:801
         submenu = 0x0
         menu_item = 0x3ac54d0
         deactivate = 1
         menu_shell = 0x4181c60
         priv = 0x4181d90
 #46 0x00007f9afff2a929 in _gtk_marshal_BOOLEAN__BOXED (closure=0x21e0bd0, 
return_value=0x7fff050e7c30, n_param_values=<optimised out>, 
param_values=0x7fff050e7ce0, invocation_hint=<optimised out>, 
marshal_data=<optimised out>) at 
/build/buildd/gtk+2.0-2.24.17/gtk/gtkmarshalers.c:86
         callback = 0x7f9afff33150 <gtk_menu_button_release>
         cc = <optimised out>
         data1 = 0x4181c60
         data2 = <optimised out>
         v_return = <optimised out>
         __PRETTY_FUNCTION__ = "_gtk_marshal_BOOLEAN__BOXED"
 #47 0x00007f9aff498620 in g_closure_invoke (closure=0x21e0bd0, 
return_value=0x7fff050e7c30, n_param_values=2, param_values=0x7fff050e7ce0, 
invocation_hint=0x7fff050e7c80) at 
/build/buildd/glib2.0-2.36.0/./gobject/gclosure.c:777
         marshal = 0x7f9aff497280 <g_type_class_meta_marshal>
         marshal_data = 0x160
         in_marshal = 0
         real_closure = 0x21e0bb0
         __PRETTY_FUNCTION__ = "g_closure_invoke"
 #48 0x00007f9aff4a9af8 in signal_emit_unlocked_R (node=node@entry=0x2113550, 
detail=detail@entry=0, instance=instance@entry=0x4181c60, 
emission_return=emission_return@entry=0x7fff050e7db0, 
instance_and_params=instance_and_params@entry=0x7fff050e7ce0) at 
/build/buildd/glib2.0-2.36.0/./gobject/gsignal.c:3622
         accumulator = 0x222e540
         emission = {next = 0x0, instance = 0x4181c60, ihint = {signal_id = 34, 
detail = 0, run_type = G_SIGNAL_RUN_LAST}, state = EMISSION_RUN, chain_type = 
36136352}
         class_closure = 0x21e0bd0
         hlist = 0x0
         handler_list = 0x0
         return_accu = 0x7fff050e7c30
         accu = {g_type = 20, data = {{v_int = 0, v_uint = 0, v_long = 0, 
v_ulong = 0, v_int64 = 0, v_uint64 = 0, v_float = 0, v_double = 0, v_pointer = 
0x0}, {v_int = 0, v_uint = 0, v_long = 0, v_ulong = 0, v_int64 = 0, v_uint64 = 
0, v_float = 0, v_double = 0, v_pointer = 0x0}}}
         signal_id = 34
         max_sequential_handler_number = 141382
         return_value_altered = 0
 #49 0x00007f9aff4b1996 in g_signal_emit_valist (instance=0x4181c60, 
signal_id=<optimised out>, detail=0, var_args=var_args@entry=0x7fff050e7f38) at 
/build/buildd/glib2.0-2.36.0/./gobject/gsignal.c:3338
         return_value = {g_type = 20, data = {{v_int = 0, v_uint = 0, v_long = 
0, v_ulong = 0, v_int64 = 0, v_uint64 = 0, v_float = 0, v_double = 0, v_pointer 
= 0x0}, {v_int = 0, v_uint = 0, v_long = 0, v_ulong = 0, v_int64 = 0, v_uint64 
= 0, v_float = 0, v_double = 0, v_pointer = 0x0}}}
         error = 0x0
         rtype = 20
         static_scope = 0
         instance_and_params = 0x7fff050e7ce0
         signal_return_type = 20
         param_values = 0x7fff050e7cf8
         node = 0x2113550
         i = <optimised out>
         n_params = 1
         __PRETTY_FUNCTION__ = "g_signal_emit_valist"
 #50 0x00007f9aff4b1f92 in g_signal_emit (instance=instance@entry=0x4181c60, 
signal_id=<optimised out>, detail=detail@entry=0) at 
/build/buildd/glib2.0-2.36.0/./gobject/gsignal.c:3384
         var_args = {{gp_offset = 32, fp_offset = 48, overflow_arg_area = 
0x7fff050e8010, reg_save_area = 0x7fff050e7f50}}
 #51 0x00007f9b00043d9e in gtk_widget_event_internal 
(widget=widget@entry=0x4181c60, event=event@entry=0x3ec7900) at 
/build/buildd/gtk+2.0-2.24.17/gtk/gtkwidget.c:5010
         signal_num = <optimised out>
         return_val = 0
 #52 0x00007f9b00044119 in IA__gtk_widget_event (widget=widget@entry=0x4181c60, 
event=event@entry=0x3ec7900) at 
/build/buildd/gtk+2.0-2.24.17/gtk/gtkwidget.c:4807
         __PRETTY_FUNCTION__ = "IA__gtk_widget_event"
 #53 0x00007f9afff28ca4 in IA__gtk_propagate_event (widget=0x4181c60, 
event=0x3ec7900) at /build/buildd/gtk+2.0-2.24.17/gtk/gtkmain.c:2509
         tmp = <optimised out>
         handled_event = <optimised out>
         __PRETTY_FUNCTION__ = "IA__gtk_propagate_event"
 #54 0x00007f9afff2900b in IA__gtk_main_do_event (event=0x3ec7900) at 
/build/buildd/gtk+2.0-2.24.17/gtk/gtkmain.c:1699
         event_widget = <optimised out>
         grab_widget = 0x3ac54d0
         window_group = <optimised out>
         rewritten_event = <optimised out>
         tmp_list = <optimised out>
         __PRETTY_FUNCTION__ = "IA__gtk_main_do_event"
 #55 0x00007f9affb9dccc in gdk_event_dispatch (source=source@entry=0x21cf760, 
callback=<optimised out>, user_data=<optimised out>) at 
/build/buildd/gtk+2.0-2.24.17/gdk/x11/gdkevents-x11.c:2403
         display = <optimised out>
         event = 0x3ec7900
 #56 0x00007f9aff1d4f05 in g_main_dispatch (context=0x22340a0) at 
/build/buildd/glib2.0-2.36.0/./glib/gmain.c:3054
         dispatch = 0x7f9affb9dc80 <gdk_event_dispatch>
         was_in_call = 0
         user_data = 0x0
         callback = 0x0
         cb_funcs = 0x0
         cb_data = 0x0
         current_source_link = {data = 0x21cf760, next = 0x0}
         need_destroy = <optimised out>
         source = 0x21cf760
         current = 0x2998520
         i = <optimised out>
 #57 g_main_context_dispatch (context=context@entry=0x22340a0) at 
/build/buildd/glib2.0-2.36.0/./glib/gmain.c:3630
 No locals.
 #58 0x00007f9aff1d5248 in g_main_context_iterate (context=0x22340a0, 
block=block@entry=1, dispatch=dispatch@entry=1, self=<optimised out>) at 
/build/buildd/glib2.0-2.36.0/./glib/gmain.c:3701
         max_priority = 2147483647
         timeout = 50
         some_ready = 1
         allocated_nfds = <optimised out>
         fds = 0x2d9ac90
         nfds = <optimised out>
 #59 0x00007f9aff1d56ba in g_main_loop_run (loop=0x2d2fc00) at 
/build/buildd/glib2.0-2.36.0/./glib/gmain.c:3895
         __PRETTY_FUNCTION__ = "g_main_loop_run"
 #60 0x00007f9afff27fe7 in IA__gtk_main () at 
/build/buildd/gtk+2.0-2.24.17/gtk/gtkmain.c:1271
         tmp_list = 0x0
         functions = 0x0
         init = <optimised out>
         loop = 0x2d2fc00
 #61 0x0000000000414f5f in ?? ()
 No symbol table info available.
 #62 0x000000000043803f in ?? ()
 No symbol table info available.
 #63 0x00007f9afede5ea5 in __libc_start_main (main=0x411dc0, argc=1, 
ubp_av=0x7fff050e85f8, init=<optimised out>, fini=<optimised out>, 
rtld_fini=<optimised out>, stack_end=0x7fff050e85e8) at libc-start.c:260
         result = <optimised out>
         unwind_buf = {cancel_jmp_buf = {{jmp_buf = {0, 8040319136070643534, 
4267464, 140733278225904, 0, 0, -8040339604638519474, -8025117551350632626}, 
mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x5581d0, 0x7fff050e85f8}, data 
= {prev = 0x0, cleanup = 0x0, canceltype = 5603792}}}
         not_first_call = <optimised out>
 #64 0x0000000000411df1 in ?? ()
 No symbol table info available.
 #65 0x00007fff050e85e8 in ?? ()
 No symbol table info available.
 #66 0x000000000000001c in ?? ()
 No symbol table info available.
 #67 0x0000000000000001 in ?? ()
 No symbol table info available.
 #68 0x00007fff050e99bb in ?? ()
 No symbol table info available.
 #69 0x0000000000000000 in ?? ()
 No symbol table info available.

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https://bugs.launchpad.net/bugs/1208625

Title:
  freeciv-gtk2 crashes under Unity when using menubar in cities report

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