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On ubuntu touch rtm 248, those warning are displayed when selecting the
"call back" action in the messaging menu, following a missed call

"g_variant_unref: assertion 'value->ref_count > 0' failed"

backtrace of a warning

"#0  g_log (log_domain=0xb6598a70 "GLib", 
    log_level=log_level@entry=G_LOG_LEVEL_CRITICAL, 
    format=0xb65a17d4 "%s: assertion '%s' failed")
    at /build/buildd/glib2.0-2.41.5/./glib/gmessages.c:1075
#1  0xb656ad62 in g_return_if_fail_warning (log_domain=<optimized out>, 
    pretty_function=<optimized out>, expression=<optimized out>)
    at /build/buildd/glib2.0-2.41.5/./glib/gmessages.c:1088
#2  0xb6516664 in action_free (data=0xb3000e70) at messaging-menu-message.c:76
#3  0xb657aae8 in g_slist_foreach (list=<optimized out>, list@entry=0xf72490, 
    func=0xb6516621 <action_free>, user_data=user_data@entry=0x0)
    at /build/buildd/glib2.0-2.41.5/./glib/gslist.c:877
#4  0xb657aafa in g_slist_free_full (list=0xf72490, free_func=<optimized out>)
    at /build/buildd/glib2.0-2.41.5/./glib/gslist.c:172
#5  0xb651672c in messaging_menu_message_finalize (object=0xb2603b50)
    at messaging-menu-message.c:101
#6  0xb66139f8 in g_object_unref (_object=0xb2603b50)
    at /build/buildd/glib2.0-2.41.5/./gobject/gobject.c:3170
#7  0xb65596a0 in g_hash_table_remove_internal (hash_table=0xf70608, 
    key=0xfbb4c0, notify=1) at /build/buildd/glib2.0-2.41.5/./glib/ghash.c:1300
#8  0xb651518e in messaging_menu_app_remove_message_internal (app=0xf70640, 
    message_id=0xfbb4c0 "<caller_number_replaced>") at messaging-menu-app.c:510
#9  0xb6515348 in messaging_menu_app_activate_message (app_interface=0xf3ba70, 
    invocation=0xf70678, message_id=0xfbb4c0 "<caller_number_replaced>", 
    action_id=0xf92460 "callBack", params=0xf777c8, user_data=0xf70640)
    at messaging-menu-app.c:593
#10 0xb5cda948 in ffi_call_VFP () from /usr/lib/arm-linux-gnueabihf/libffi.so.6
#11 0xb5cdafc0 in ffi_call () from /usr/lib/arm-linux-gnueabihf/libffi.so.6
#12 0xb6610b6c in g_cclosure_marshal_generic (closure=<optimized out>, 
    return_gvalue=<optimized out>, n_param_values=5, 
    param_values=<optimized out>, invocation_hint=0xbedc4070, marshal_data=0x0)
    at /build/buildd/glib2.0-2.41.5/./gobject/gclosure.c:1448
#13 0xb66105b4 in g_closure_invoke (closure=0xf726d8, return_value=0xbedc4050, 
    n_param_values=5, param_values=0xf9dbc0, invocation_hint=0xbedc4070)
    at /build/buildd/glib2.0-2.41.5/./gobject/gclosure.c:768
#14 0xb661d0aa in signal_emit_unlocked_R (node=node@entry=0xf62da0, 
    detail=detail@entry=0, instance=instance@entry=0xf3ba70, 
    emission_return=emission_return@entry=0xbedc4160, 
    instance_and_params=instance_and_params@entry=0xf9dbc0)
    at /build/buildd/glib2.0-2.41.5/./gobject/gsignal.c:3553
#15 0xb6622a30 in g_signal_emitv (instance_and_params=0xf9dbc0, 
    signal_id=<optimized out>, detail=0, return_value=0xbedc4160)
    at /build/buildd/glib2.0-2.41.5/./gobject/gsignal.c:3048
#16 0xb651aac4 in _indicator_messages_application_skeleton_handle_method_call (
    connection=0xb3006048, sender=0xb26055b8 ":1.52", 
    object_path=0xb2605c48 "/com/canonical/indicator/messages/telephony_service_call_desktop", 
    interface_name=0xb26052a8 "com.canonical.indicator.messages.application", 
    method_name=0xb26055e8 "ActivateMessage", parameters=0xf8a508, 
    invocation=0xf70678, user_data=0xf3ba70)
    at indicator-messages-application.c:1917
#17 0xb66f0fa4 in g_dbus_interface_method_dispatch_helper (
    invocation=0xf70678, 
    method_call_func=0xb651a8a1 <_indicator_messages_application_skeleton_handle_method_call>, interface=0xf3ba70)
    at /build/buildd/glib2.0-2.41.5/./gio/gdbusinterfaceskeleton.c:609
#18 skeleton_intercept_handle_method_call (connection=<optimized out>, 
    sender=<optimized out>, object_path=<optimized out>, 
    interface_name=<optimized out>, method_name=0xb26055e8 "ActivateMessage", 
    parameters=0xf8a508, invocation=0xf70678, user_data=0xf3ba70)
    at /build/buildd/glib2.0-2.41.5/./gio/gdbusinterfaceskeleton.c:650
#19 0xb66df692 in call_in_idle_cb (user_data=0xf70678)
    at /build/buildd/glib2.0-2.41.5/./gio/gdbusconnection.c:4884
#20 0xb6565e78 in g_main_dispatch (context=0xf284e8)
    at /build/buildd/glib2.0-2.41.5/./glib/gmain.c:3064
#21 g_main_context_dispatch (context=context@entry=0xf284e8)
    at /build/buildd/glib2.0-2.41.5/./glib/gmain.c:3663
#22 0xb65660fc in g_main_context_iterate (context=context@entry=0xf284e8, 
    block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>)
    at /build/buildd/glib2.0-2.41.5/./glib/gmain.c:3734
#23 0xb656617c in g_main_context_iteration (context=0xf284e8, may_block=1)
    at /build/buildd/glib2.0-2.41.5/./glib/gmain.c:3795
#24 0xb6cfa79c in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/arm-linux-gnueabihf/libQt5Core.so.5
#25 0xb6cbda8e in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) ()
   from /usr/lib/arm-linux-gnueabihf/libQt5Core.so.5
#26 0xb6cc2b8a in QCoreApplication::exec() ()
   from /usr/lib/arm-linux-gnueabihf/libQt5Core.so.5
#27 0x0002fae4 in main (argc=1, argv=<optimized out>)
    at /build/buildd/telephony-service-0.1+15.04.20150218~rtm/indicator/main.cpp:89"

** Affects: telephony-service (Ubuntu)
     Importance: Undecided
         Status: New

-- 
g_variant_unref warning displayed when calling back after a missed call 
https://bugs.launchpad.net/bugs/1427286
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