Thread 1 "ArdourGUI" received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0x7fffe91573c0 (LWP 6074)]
0x00007fffecf7dcbe in std::__detail::_List_node_base::_M_unhook() () from /usr/lib64/libstdc++.so.6
(gdb) bt
#0  0x00007fffecf7dcbe in std::__detail::_List_node_base::_M_unhook() () from /usr/lib64/libstdc++.so.6
#1  0x0000555555c66810 in std::__cxx11::list<std::pair<PBD::ID const, std::__cxx11::list<int, std::allocator<int> > >, std::allocator<std::pair<PBD::ID const, std::__cxx11::list<int, std::allocator<int> > > > >::_M_erase (this=0x555557cc15c0, __position=...) at /usr/include/c++/6/bits/stl_list.h:1781
#2  0x0000555555c5e90e in std::__cxx11::list<std::pair<PBD::ID const, std::__cxx11::list<int, std::allocator<int> > >, std::allocator<std::pair<PBD::ID const, std::__cxx11::list<int, std::allocator<int> > > > >::erase (this=0x555557cc15c0, __position=...) at /usr/include/c++/6/bits/list.tcc:157
#3  0x0000555555c509bc in Editor::region_view_added (this=0x55555d3f8020, rv=0x5555778cf110) at ../gtk2_ardour/editor.cc:5338
#4  0x0000555555c86f36 in sigc::bound_mem_functor1<void, Editor, RegionView*>::operator() (this=0x55557037acb8, _A_a1=@0x7fffffff9ba0: 0x5555778cf110)
    at /home/ardour/linux-x86_64-v5/gtk/inst/include/sigc++-2.0/sigc++/functors/mem_fun.h:1856
#5  0x0000555555c80201 in sigc::adaptor_functor<sigc::bound_mem_functor1<void, Editor, RegionView*> >::operator()<RegionView* const&> (this=0x55557037acb0, _A_arg1=@0x7fffffff9ba0: 0x5555778cf110)
    at /home/ardour/linux-x86_64-v5/gtk/inst/include/sigc++-2.0/sigc++/adaptors/adaptor_trait.h:89
#6  0x0000555555c773e6 in sigc::internal::slot_call1<sigc::bound_mem_functor1<void, Editor, RegionView*>, void, RegionView*>::call_it (rep=0x55557037ac80, a_1=@0x7fffffff9ba0: 0x5555778cf110)
    at /home/ardour/linux-x86_64-v5/gtk/inst/include/sigc++-2.0/sigc++/functors/slot.h:137
#7  0x0000555555b9a133 in sigc::internal::signal_emit1<void, RegionView*, sigc::nil>::emit (impl=0x55557029d6a0, _A_a1=@0x7fffffff9ba0: 0x5555778cf110)
    at /home/ardour/linux-x86_64-v5/gtk/inst/include/sigc++-2.0/sigc++/signal.h:1006
#8  0x0000555555b99165 in sigc::signal1<void, RegionView*, sigc::nil>::emit (this=0x55556f2d5e50, _A_a1=@0x7fffffff9ba0: 0x5555778cf110)
    at /home/ardour/linux-x86_64-v5/gtk/inst/include/sigc++-2.0/sigc++/signal.h:2797
#9  0x0000555555b97e17 in sigc::signal1<void, RegionView*, sigc::nil>::operator() (this=0x55556f2d5e50, _A_a1=@0x7fffffff9ba0: 0x5555778cf110)
    at /home/ardour/linux-x86_64-v5/gtk/inst/include/sigc++-2.0/sigc++/signal.h:2805
#10 0x00005555560d6d6f in MidiStreamView::add_region_view_internal (this=0x55556f2d5e20, r=..., wait_for_data=true, recording=false) at ../gtk2_ardour/midi_streamview.cc:174
#11 0x00005555565d730d in StreamView::add_region_view (this=0x55556f2d5e20, wr=...) at ../gtk2_ardour/streamview.cc:182
#12 0x00005555560dc75a in sigc::bound_mem_functor1<void, MidiStreamView, boost::weak_ptr<ARDOUR::Region> >::operator() (this=0x55557788b580, _A_a1=...)
/sigc++/functors/mem_fun.h:1856
#13 0x00005555560dc45c in sigc::adaptor_functor<sigc::bound_mem_functor1<void, MidiStreamView, boost::weak_ptr<ARDOUR::Region> > >::operator()<boost::shared_ptr<ARDOUR::Region>&> (this=0x55557788b578, 
    _A_arg1=...) at /home/ardour/linux-x86_64-v5/gtk/inst/include/sigc++-2.0/sigc++/adaptors/adaptor_trait.h:89
#14 0x00005555560dbcd7 in sigc::retype_return_functor<void, sigc::bound_mem_functor1<void, MidiStreamView, boost::weak_ptr<ARDOUR::Region> > >::operator()<boost::shared_ptr<ARDOUR::Region> > (
    this=0x55557788b570, _A_a1=...) at /home/ardour/linux-x86_64-v5/gtk/inst/include/sigc++-2.0/sigc++/adaptors/retype_return.h:165
#15 0x00005555560db6bd in boost::detail::function::void_function_obj_invoker1<sigc::retype_return_functor<void, sigc::bound_mem_functor1<void, MidiStreamView, boost::weak_ptr<ARDOUR::Region> > >, void, boost::shared_ptr<ARDOUR::Region> >::invoke (function_obj_ptr=..., a0=...) at /home/ardour/linux-x86_64-v5/gtk/inst/include/boost/function/function_template.hpp:159
#16 0x0000555555da2212 in boost::function1<void, boost::shared_ptr<ARDOUR::Region> >::operator() (this=0x7fffffff9ea0, a0=...)
    at /home/ardour/linux-x86_64-v5/gtk/inst/include/boost/function/function_template.hpp:769
#17 0x00007ffff6f56f6e in ARDOUR::Playlist::foreach_region(boost::function<void (boost::shared_ptr<ARDOUR::Region>)>) (this=0x55555e8ac920, s=...) at ../libs/ardour/playlist.cc:3000
#18 0x00005555560d77b1 in MidiStreamView::redisplay_track (this=0x55556f2d5e20) at ../gtk2_ardour/midi_streamview.cc:294
#19 0x00005555565d7f56 in StreamView::playlist_switched (this=0x55556f2d5e20, wtr=...) at ../gtk2_ardour/streamview.cc:330
#20 0x00005555565d763b in StreamView::display_track (this=0x55556f2d5e20, tr=...) at ../gtk2_ardour/streamview.cc:229
#21 0x00005555565d6f42 in StreamView::attach (this=0x55556f2d5e20) at ../gtk2_ardour/streamview.cc:109
#22 0x00005555560df93d in MidiTimeAxisView::first_idle (this=0x5555701acc50) at ../gtk2_ardour/midi_time_axis.cc:313
#23 0x0000555555c50176 in Editor::first_idle (this=0x55555d3f8020) at ../gtk2_ardour/editor.cc:5217
#24 0x0000555555b4f6df in ARDOUR_UI::first_idle (this=0x5555572acf30) at ../gtk2_ardour/ardour_ui_startup.cc:102
#25 0x0000555555ae4e00 in sigc::bound_mem_functor0<bool, ARDOUR_UI>::operator() (this=0x5555760071a8) at /home/ardour/linux-x86_64-v5/gtk/inst/include/sigc++-2.0/sigc++/functors/mem_fun.h:1787
#26 0x0000555555add3cc in sigc::adaptor_functor<sigc::bound_mem_functor0<bool, ARDOUR_UI> >::operator() (this=0x5555760071a0)
    at /home/ardour/linux-x86_64-v5/gtk/inst/include/sigc++-2.0/sigc++/adaptors/adaptor_trait.h:256
#27 0x0000555555ad4575 in sigc::internal::slot_call0<sigc::bound_mem_functor0<bool, ARDOUR_UI>, bool>::call_it (rep=0x555576007170)
    at /home/ardour/linux-x86_64-v5/gtk/inst/include/sigc++-2.0/sigc++/functors/slot.h:103
#28 0x00007ffff3502032 in ?? () from /opt/Ardour-6.6.45-dbg/lib/libglibmm-2.4.so.1
#29 0x00007ffff2f5fa2a in g_main_context_dispatch () from /opt/Ardour-6.6.45-dbg/lib/libglib-2.0.so.0
#30 0x00007ffff2f5fdd0 in ?? () from /opt/Ardour-6.6.45-dbg/lib/libglib-2.0.so.0
#31 0x00007ffff2f5fe7c in g_main_context_iteration () from /opt/Ardour-6.6.45-dbg/lib/libglib-2.0.so.0
#32 0x00007ffff2550601 in gtk_main_iteration () from /opt/Ardour-6.6.45-dbg/lib/libgtk-x11-2.0.so.0
#33 0x00007ffff457f8e5 in Gtkmm2ext::UI::flush_pending (this=0x5555572acf30, timeout=10) at ../libs/gtkmm2ext/gtk_ui.cc:780
#34 0x0000555555b42816 in ARDOUR_UI::load_session_stage_two (this=0x5555572acf30, path=..., snap_name=..., mix_template=...) at ../gtk2_ardour/ardour_ui_session.cc:523
#35 0x0000555555b41e3f in ARDOUR_UI::load_session (this=0x5555572acf30, path=..., snap_name=..., mix_template=...) at ../gtk2_ardour/ardour_ui_session.cc:358
#36 0x0000555555b52185 in ARDOUR_UI::load_session_from_startup_fsm (this=0x5555572acf30) at ../gtk2_ardour/ardour_ui_startup.cc:581
#37 0x0000555555b51a6d in ARDOUR_UI::sfsm_response (this=0x5555572acf30, r=StartupFSM::LoadSession) at ../gtk2_ardour/ardour_ui_startup.cc:487
#38 0x0000555555b55284 in sigc::bound_mem_functor1<void, ARDOUR_UI, StartupFSM::Result>::operator() (this=0x5555577a80c8, _A_a1=@0x7fffffffb41c: StartupFSM::LoadSession)
    at /home/ardour/linux-x86_64-v5/gtk/inst/include/sigc++-2.0/sigc++/functors/mem_fun.h:1856
#39 0x0000555555b55053 in sigc::adaptor_functor<sigc::bound_mem_functor1<void, ARDOUR_UI, StartupFSM::Result> >::operator()<StartupFSM::Result const&> (this=0x5555577a80c0, 
    _A_arg1=@0x7fffffffb41c: StartupFSM::LoadSession) at /home/ardour/linux-x86_64-v5/gtk/inst/include/sigc++-2.0/sigc++/adaptors/adaptor_trait.h:89
#40 0x0000555555b54c64 in sigc::internal::slot_call1<sigc::bound_mem_functor1<void, ARDOUR_UI, StartupFSM::Result>, void, StartupFSM::Result>::call_it (rep=0x5555577a8090, 
    a_1=@0x7fffffffb41c: StartupFSM::LoadSession) at /home/ardour/linux-x86_64-v5/gtk/inst/include/sigc++-2.0/sigc++/functors/slot.h:137
#41 0x00005555565a4472 in sigc::internal::signal_emit1<void, StartupFSM::Result, sigc::nil>::emit (impl=0x5555577a8030, _A_a1=@0x7fffffffb41c: StartupFSM::LoadSession)
    at /home/ardour/linux-x86_64-v5/gtk/inst/include/sigc++-2.0/sigc++/signal.h:1006
#42 0x00005555565a3d39 in sigc::signal1<void, StartupFSM::Result, sigc::nil>::emit (this=0x5555573cfde0, _A_a1=@0x7fffffffb41c: StartupFSM::LoadSession)
at /home/ardour/linux-x86_64-v5/gtk/inst/include/sigc++-2.0/sigc++/signal.h:2797
#43 0x00005555565a35c5 in sigc::signal1<void, StartupFSM::Result, sigc::nil>::operator() (this=0x5555573cfde0, _A_a1=@0x7fffffffb41c: StartupFSM::LoadSession)
    at /home/ardour/linux-x86_64-v5/gtk/inst/include/sigc++-2.0/sigc++/signal.h:2805
#44 0x000055555659f67a in StartupFSM::dialog_response_handler (this=0x5555573cfca0, response=-5, dialog_id=StartupFSM::PluginDialog) at ../gtk2_ardour/startup_fsm.cc:318
#45 0x00005555565a614b in sigc::bound_mem_functor2<void, StartupFSM, int, StartupFSM::DialogID>::operator() (this=0x5555597bae70, _A_a1=@0x7fffffffb53c: -5, _A_a2=@0x5555597bae90: StartupFSM::PluginDialog)
    at /home/ardour/linux-x86_64-v5/gtk/inst/include/sigc++-2.0/sigc++/functors/mem_fun.h:1927
#46 0x00005555565a5bdb in sigc::adaptor_functor<sigc::bound_mem_functor2<void, StartupFSM, int, StartupFSM::DialogID> >::operator()<int const&, StartupFSM::DialogID&> (this=0x5555597bae68, 
    _A_arg1=@0x7fffffffb53c: -5, _A_arg2=@0x5555597bae90: StartupFSM::PluginDialog) at /home/ardour/linux-x86_64-v5/gtk/inst/include/sigc++-2.0/sigc++/adaptors/adaptor_trait.h:108
#47 0x00005555565a55d2 in sigc::bind_functor<-1, sigc::bound_mem_functor2<void, StartupFSM, int, StartupFSM::DialogID>, StartupFSM::DialogID, sigc::nil, sigc::nil, sigc::nil, sigc::nil, sigc::nil, sigc::nil>::operator()<int const&> (this=0x5555597bae60, _A_arg1=@0x7fffffffb53c: -5) at /home/ardour/linux-x86_64-v5/gtk/inst/include/sigc++-2.0/sigc++/adaptors/bind.h:1135
#48 0x00005555565a4efe in sigc::internal::slot_call1<sigc::bind_functor<-1, sigc::bound_mem_functor2<void, StartupFSM, int, StartupFSM::DialogID>, StartupFSM::DialogID, sigc::nil, sigc::nil, sigc::nil, sigc::nil, sigc::nil, sigc::nil>, void, int>::call_it (rep=0x5555597bae30, a_1=@0x7fffffffb53c: -5) at /home/ardour/linux-x86_64-v5/gtk/inst/include/sigc++-2.0/sigc++/functors/slot.h:137
#49 0x00007ffff06c65f5 in ?? () from /opt/Ardour-6.6.45-dbg/lib/libgtkmm-2.4.so.1
#50 0x00007ffff326e945 in g_closure_invoke () from /opt/Ardour-6.6.45-dbg/lib/libgobject-2.0.so.0
#51 0x00007ffff328001b in ?? () from /opt/Ardour-6.6.45-dbg/lib/libgobject-2.0.so.0
#52 0x00007ffff3289c30 in g_signal_emit_valist () from /opt/Ardour-6.6.45-dbg/lib/libgobject-2.0.so.0
#53 0x00007ffff328a082 in g_signal_emit () from /opt/Ardour-6.6.45-dbg/lib/libgobject-2.0.so.0
#54 0x00007ffff24ae80c in gtk_dialog_response () from /opt/Ardour-6.6.45-dbg/lib/libgtk-x11-2.0.so.0
#55 0x00005555565a0c35 in StartupFSM::engine_running (this=0x5555573cfca0) at ../gtk2_ardour/startup_fsm.cc:544
#56 0x00005555565a09e7 in StartupFSM::start_audio_midi_setup (this=0x5555573cfca0) at ../gtk2_ardour/startup_fsm.cc:518
#57 0x000055555659f4d8 in StartupFSM::dialog_response_handler (this=0x5555573cfca0, response=-3, dialog_id=StartupFSM::NewSessionDialog) at ../gtk2_ardour/startup_fsm.cc:256
#58 0x00005555565a614b in sigc::bound_mem_functor2<void, StartupFSM, int, StartupFSM::DialogID>::operator() (this=0x555557968440, _A_a1=@0x7fffffffbf8c: -3, _A_a2=@0x555557968460: StartupFSM::NewSessionDialog)
    at /home/ardour/linux-x86_64-v5/gtk/inst/include/sigc++-2.0/sigc++/functors/mem_fun.h:1927
#59 0x00005555565a5bdb in sigc::adaptor_functor<sigc::bound_mem_functor2<void, StartupFSM, int, StartupFSM::DialogID> >::operator()<int const&, StartupFSM::DialogID&> (this=0x555557968438, 
    _A_arg1=@0x7fffffffbf8c: -3, _A_arg2=@0x555557968460: StartupFSM::NewSessionDialog) at /home/ardour/linux-x86_64-v5/gtk/inst/include/sigc++-2.0/sigc++/adaptors/adaptor_trait.h:108
#60 0x00005555565a55d2 in sigc::bind_functor<-1, sigc::bound_mem_functor2<void, StartupFSM, int, StartupFSM::DialogID>, StartupFSM::DialogID, sigc::nil, sigc::nil, sigc::nil, sigc::nil, sigc::nil, sigc::nil>::operator()<int const&> (this=0x555557968430, _A_arg1=@0x7fffffffbf8c: -3) at /home/ardour/linux-x86_64-v5/gtk/inst/include/sigc++-2.0/sigc++/adaptors/bind.h:1135
#61 0x00005555565a4efe in sigc::internal::slot_call1<sigc::bind_functor<-1, sigc::bound_mem_functor2<void, StartupFSM, int, StartupFSM::DialogID>, StartupFSM::DialogID, sigc::nil, sigc::nil, sigc::nil, sigc::nil, sigc::nil, sigc::nil>, void, int>::call_it (rep=0x555557968400, a_1=@0x7fffffffbf8c: -3) at /home/ardour/linux-x86_64-v5/gtk/inst/include/sigc++-2.0/sigc++/functors/slot.h:137
#62 0x00007ffff06c65f5 in ?? () from /opt/Ardour-6.6.45-dbg/lib/libgtkmm-2.4.so.1
#63 0x00007ffff326e945 in g_closure_invoke () from /opt/Ardour-6.6.45-dbg/lib/libgobject-2.0.so.0
#64 0x00007ffff328001b in ?? () from /opt/Ardour-6.6.45-dbg/lib/libgobject-2.0.so.0
#65 0x00007ffff3289c30 in g_signal_emit_valist () from /opt/Ardour-6.6.45-dbg/lib/libgobject-2.0.so.0
#66 0x00007ffff328a082 in g_signal_emit () from /opt/Ardour-6.6.45-dbg/lib/libgobject-2.0.so.0
#67 0x00007ffff24ae80c in gtk_dialog_response () from /opt/Ardour-6.6.45-dbg/lib/libgtk-x11-2.0.so.0
#68 0x000055555651b79c in SessionDialog::open_button_pressed (this=0x5555577b8800, ev=0x555557999a60) at ../gtk2_ardour/session_dialog.cc:541
#69 0x0000555556525be6 in sigc::bound_mem_functor1<bool, SessionDialog, _GdkEventButton*>::operator() (this=0x5555579ac3c8, _A_a1=@0x7fffffffc4a8: 0x555557999a60)
    at /home/ardour/linux-x86_64-v5/gtk/inst/include/sigc++-2.0/sigc++/functors/mem_fun.h:1856
#70 0x00005555565242e7 in sigc::adaptor_functor<sigc::bound_mem_functor1<bool, SessionDialog, _GdkEventButton*> >::operator()<_GdkEventButton* const&> (this=0x5555579ac3c0, 
    _A_arg1=@0x7fffffffc4a8: 0x555557999a60) at /home/ardour/linux-x86_64-v5/gtk/inst/include/sigc++-2.0/sigc++/adaptors/adaptor_trait.h:89
#71 0x0000555556523012 in sigc::internal::slot_call1<sigc::bound_mem_functor1<bool, SessionDialog, _GdkEventButton*>, bool, _GdkEventButton*>::call_it (rep=0x5555579ac390, a_1=@0x7fffffffc4a8: 0x555557999a60)
at /home/ardour/linux-x86_64-v5/gtk/inst/include/sigc++-2.0/sigc++/functors/slot.h:137
#72 0x00007ffff074ba9b in ?? () from /opt/Ardour-6.6.45-dbg/lib/libgtkmm-2.4.so.1
#73 0x00007ffff2552cac in ?? () from /opt/Ardour-6.6.45-dbg/lib/libgtk-x11-2.0.so.0
#74 0x00007ffff326e945 in g_closure_invoke () from /opt/Ardour-6.6.45-dbg/lib/libgobject-2.0.so.0
#75 0x00007ffff327fbf2 in ?? () from /opt/Ardour-6.6.45-dbg/lib/libgobject-2.0.so.0
#76 0x00007ffff328969b in g_signal_emit_valist () from /opt/Ardour-6.6.45-dbg/lib/libgobject-2.0.so.0
#77 0x00007ffff328a082 in g_signal_emit () from /opt/Ardour-6.6.45-dbg/lib/libgobject-2.0.so.0
#78 0x00007ffff26d764c in ?? () from /opt/Ardour-6.6.45-dbg/lib/libgtk-x11-2.0.so.0
#79 0x00007ffff255129d in gtk_propagate_event () from /opt/Ardour-6.6.45-dbg/lib/libgtk-x11-2.0.so.0
#80 0x00007ffff2551723 in gtk_main_do_event () from /opt/Ardour-6.6.45-dbg/lib/libgtk-x11-2.0.so.0
#81 0x00007ffff216db4c in ?? () from /opt/Ardour-6.6.45-dbg/lib/libgdk-x11-2.0.so.0
#82 0x00007ffff2f5fb67 in g_main_context_dispatch () from /opt/Ardour-6.6.45-dbg/lib/libglib-2.0.so.0
#83 0x00007ffff2f5fdd0 in ?? () from /opt/Ardour-6.6.45-dbg/lib/libglib-2.0.so.0
#84 0x00007ffff2f600f2 in g_main_loop_run () from /opt/Ardour-6.6.45-dbg/lib/libglib-2.0.so.0
#85 0x00007ffff25503e7 in gtk_main () from /opt/Ardour-6.6.45-dbg/lib/libgtk-x11-2.0.so.0
#86 0x00007ffff457d0e4 in Gtkmm2ext::UI::run (this=0x5555572acf30, old_receiver=...) at ../libs/gtkmm2ext/gtk_ui.cc:310
#87 0x000055555607990f in main (argc=1, argv=0x7fffffffcfd8) at ../gtk2_ardour/main.cc:410