#0  0x00000000006311ab in boost::detail::atomic_increment(int*) (pw=0x74672e786f425673)
    at /usr/include/boost/smart_ptr/detail/sp_counted_base_gcc_x86.hpp:66
#1  0x00000000006311f8 in boost::detail::sp_counted_base::add_ref_copy() (this=0x74672e786f42566b)
    at /usr/include/boost/smart_ptr/detail/sp_counted_base_gcc_x86.hpp:134
#2  0x0000000000631331 in boost::detail::shared_count::shared_count(boost::detail::shared_count const&) (this=0x7fffffffc278, r=...)
    at /usr/include/boost/smart_ptr/detail/shared_count.hpp:454
#3  0x000000000077c32b in boost::shared_ptr<Evoral::Note<Evoral::Beats> >::shared_ptr(boost::shared_ptr<Evoral::Note<Evoral::Beats> > const&) (this=0x7fffffffc270) at /usr/include/boost/smart_ptr/shared_ptr.hpp:323
#4  0x000000000077c3cb in NoteBase::note() const (this=0x462cea0) at ../gtk2_ardour/note_base.h:102
#5  0x000000000085d6e3 in NoteDrag::total_dx(unsigned int) const (this=0x514b1d0, state=256) at ../gtk2_ardour/editor_drag.cc:5316
#6  0x000000000085df55 in NoteDrag::finished(_GdkEvent*, bool) (this=0x514b1d0, ev=0x52174e0, moved=true) at ../gtk2_ardour/editor_drag.cc:5441
#7  0x000000000084289b in Drag::end_grab(_GdkEvent*) (this=0x514b1d0, event=0x52174e0) at ../gtk2_ardour/editor_drag.cc:307
#8  0x0000000000842134 in DragManager::end_grab(_GdkEvent*) (this=0x34595d0, e=0x52174e0) at ../gtk2_ardour/editor_drag.cc:154
#9  0x000000000083b90a in Editor::track_canvas_button_release_event(_GdkEventButton*) (this=0x30ef460, event=0x52174e0)
    at ../gtk2_ardour/editor_canvas_events.cc:197
#10 0x00000000007e3844 in sigc::bound_mem_functor1<bool, Editor, _GdkEventButton*>::operator()(_GdkEventButton* const&) const (this=0x34fc6c8, _A_a1=@0x7fffffffc418: 0x52174e0) at /usr/include/sigc++-2.0/sigc++/functors/mem_fun.h:1856
#11 0x00000000007dca79 in sigc::adaptor_functor<sigc::bound_mem_functor1<bool, Editor, _GdkEventButton*> >::operator()<_GdkEventButton* const&>(_GdkEventButton* const&) const (this=0x34fc6c0, _A_arg1=@0x7fffffffc418: 0x52174e0) at /usr/include/sigc++-2.0/sigc++/adaptors/adaptor_trait.h:89
#12 0x00000000007d5580 in sigc::internal::slot_call1<sigc::bound_mem_functor1<bool, Editor, _GdkEventButton*>, bool, _GdkEventButton*>::call_it(sigc::internal::slot_rep*, _GdkEventButton* const&) (rep=0x34fc690, a_1=@0x7fffffffc418: 0x52174e0) at /usr/include/sigc++-2.0/sigc++/functors/slot.h:137
#13 0x00007ffff19c53ab in (anonymous namespace)::Widget_signal_button_release_event_callback(_GtkWidget*, _GdkEventButton*, void*) ()
    at /lib64/libgtkmm-2.4.so.1
#14 0x00007ffff38f983d in _gtk_marshal_BOOLEAN__BOXED () at /lib64/libgtk-x11-2.0.so.0
#15 0x00007ffff458fcd5 in g_closure_invoke () at /lib64/libgobject-2.0.so.0
#16 0x00007ffff45a18d4 in signal_emit_unlocked_R () at /lib64/libgobject-2.0.so.0
#17 0x00007ffff45a9ae2 in g_signal_emit_valist () at /lib64/libgobject-2.0.so.0
#18 0x00007ffff45aa29f in g_signal_emit () at /lib64/libgobject-2.0.so.0
#19 0x00007ffff3a2983c in gtk_widget_event_internal () at /lib64/libgtk-x11-2.0.so.0
#20 0x00007ffff38f7b24 in gtk_propagate_event () at /lib64/libgtk-x11-2.0.so.0
#21 0x00007ffff38f7eeb in gtk_main_do_event () at /lib64/libgtk-x11-2.0.so.0
#22 0x00007ffff35507ac in gdk_event_dispatch () at /lib64/libgdk-x11-2.0.so.0
#23 0x00007ffff428fa8a in g_main_context_dispatch () at /lib64/libglib-2.0.so.0
#24 0x00007ffff428fe20 in g_main_context_iterate.isra () at /lib64/libglib-2.0.so.0
---Type <return> to continue, or q <return> to quit---
#25 0x00007ffff4290142 in g_main_loop_run () at /lib64/libglib-2.0.so.0
#26 0x00007ffff38f6f37 in gtk_main () at /lib64/libgtk-x11-2.0.so.0
#27 0x00007ffff7588fee in Gtkmm2ext::UI::run(Receiver&) (this=0x183fb30, old_receiver=...) at ../libs/gtkmm2ext/gtk_ui.cc:280
#28 0x0000000000a7bbe0 in main(int, char**) (argc=1, argv=0x7fffffffcdc8) at ../gtk2_ardour/main.cc:389