#0  0xb71b1266 in g_variant_ref_sink (value=0xfffffff9) at /build/buildd/glib2.0-2.32.0/./glib/gvariant-core.c:700
        __PRETTY_FUNCTION__ = "g_variant_ref_sink"
#1  0xb46c4dd3 in unity::launcher::SoftwareCenterLauncherIcon::OnPropertyChanged (this=0xb367800, params=0xb0f334a8) at /build/buildd/unity-5.8.0/plugins/unityshell/src/SoftwareCenterLauncherIcon.cpp:69
        property_value = 0x9bfc634
        progress = -1217597452
        property_name = {<boost::noncopyable_::noncopyable> = {<No data fields>}, string_ = 0xa419a88 "Status"}
#2  0xb46c55bd in operator() (this=0xa3af694, _A_a1=<optimized out>) at /usr/include/sigc++-2.0/sigc++/functors/mem_fun.h:1851
No locals.
#3  operator()<_GVariant* const&> (this=0xa3af690, _A_arg1=<optimized out>) at /usr/include/sigc++-2.0/sigc++/adaptors/adaptor_trait.h:84
No locals.
#4  sigc::internal::slot_call1<sigc::bound_mem_functor1<void, unity::launcher::SoftwareCenterLauncherIcon, _GVariant*>, void, _GVariant*>::call_it (rep=0xa3af678, a_1=@0xbfd1b460) at /usr/include/sigc++-2.0/sigc++/functors/slot.h:137
        typed_rep = 0xa3af678
#5  0xb3c04e07 in operator() (_A_a1=<optimized out>, this=<optimized out>) at /usr/include/sigc++-2.0/sigc++/functors/slot.h:515
No locals.
#6  operator() (_A_a1=<optimized out>, this=<optimized out>) at /build/buildd/unity-5.8.0/UnityCore/GLibDBusProxy.cpp:226
No locals.
#7  unity::glib::DBusProxy::Impl::OnProxySignal (this=0xa48c060, proxy=0x9681d20, sender_name=0xa972c70 ":1.85", signal_name=0xa2e0360 "\020", parameters=0xb0f334a8) at /build/buildd/unity-5.8.0/UnityCore/GLibDBusProxy.cpp:237
        callback = {<sigc::slot1<void, _GVariant*>> = {<sigc::slot_base> = {<sigc::functor_base> = {<No data fields>}, rep_ = 0xa3af678, blocked_ = false}, <No data fields>}, <No data fields>}
#8  0xb3c0556c in operator() (_A_a3=@0xbfd1b4b8, this=0xaec92bc, _A_a2=@0xbfd1b4b4, _A_a1=<optimized out>, _A_a4=<optimized out>) at /usr/include/sigc++-2.0/sigc++/functors/mem_fun.h:2055
No locals.
#9  operator()<_GDBusProxy* const&, char* const&, char* const&, _GVariant* const&> (_A_arg3=@0xbfd1b4b8, _A_arg2=@0xbfd1b4b4, this=0xaec92b8, _A_arg1=<optimized out>, _A_arg4=<optimized out>) at /usr/include/sigc++-2.0/sigc++/adaptors/adaptor_trait.h:144
No locals.
#10 sigc::internal::slot_call4<sigc::bound_mem_functor4<void, unity::glib::DBusProxy::Impl, _GDBusProxy*, char*, char*, _GVariant*>, void, _GDBusProxy*, char*, char*, _GVariant*>::call_it (rep=0xaec92a0, a_1=@0xbfd1b4b0, a_2=@0xbfd1b4b4, a_3=@0xbfd1b4b8, a_4=@0xbfd1b4bc) at /usr/include/sigc++-2.0/sigc++/functors/slot.h:251
        typed_rep = 0xaec92a0
#11 0xb3c054b0 in operator() (_A_a4=@0xbfd1b4bc, _A_a3=@0xbfd1b4b8, _A_a2=@0xbfd1b4b4, _A_a1=@0xbfd1b4b0, this=0xa48c09c) at /usr/include/sigc++-2.0/sigc++/functors/slot.h:758
No locals.
#12 unity::glib::Signal3<void, _GDBusProxy*, char*, char*, _GVariant*>::Callback (object=0x9681d20, data1=0xa972c70 ":1.85", data2=0xa9731d0 "PropertyChanged", data3=0xb0f334a8, self=0xa48c08c) at /build/buildd/unity-5.8.0/UnityCore/GLibSignal-inl.h:120
No locals.
#13 0xb701235a in ffi_call_SYSV () at ../src/x86/sysv.S:64
No locals.
#14 0xb701208f in ffi_call (cif=0xbfd1b60c, fn=0xb3c05470 <unity::glib::Signal3<void, _GDBusProxy*, char*, char*, _GVariant*>::Callback(_GDBusProxy*, char*, char*, _GVariant*, unity::glib::Signal3<void, _GDBusProxy*, char*, char*, _GVariant*>*)>, rvalue=0xbfd1b590, avalue=0xbfd1b530) at ../src/x86/ffi.c:303
        ecif = {cif = 0xbfd1b60c, rvalue = 0xbfd1b590, avalue = 0xbfd1b530}
#15 0xb7083f34 in value_to_ffi_type (gvalue=0xbfd1b608, value=0xbfd1b648, enum_tmpval=0xbfd1b5f8, tmpval_used=0xa75bcb8) at /build/buildd/glib2.0-2.32.0/./gobject/gclosure.c:1182
        rettype = <optimized out>
        type = 4294967289
        __PRETTY_FUNCTION__ = "value_to_ffi_type"
#16 0xb614fff4 in ?? () from /tmp/tmpWCIeR4/usr/lib/compiz/libopengl.so
No symbol table info available.
Backtrace stopped: previous frame inner to this frame (corrupt stack?)