#0  __pthread_kill_implementation (no_tid=0, signo=6, threadid=<optimized out>) at ./nptl/pthread_kill.c:44
        tid = <optimized out>
        ret = 0
        pd = <optimized out>
        old_mask = {__val = {140737226669184}}
        ret = <optimized out>
        pd = <optimized out>
        old_mask = {__val = {<optimized out>}}
        ret = <optimized out>
        tid = <optimized out>
        ret = <optimized out>
        resultvar = <optimized out>
        resultvar = <optimized out>
        __arg3 = <optimized out>
        __arg2 = <optimized out>
        __arg1 = <optimized out>
        _a3 = <optimized out>
        _a2 = <optimized out>
        _a1 = <optimized out>
        __futex = <optimized out>
        resultvar = <optimized out>
        __arg3 = <optimized out>
        __arg2 = <optimized out>
        __arg1 = <optimized out>
        _a3 = <optimized out>
        _a2 = <optimized out>
        _a1 = <optimized out>
        __futex = <optimized out>
        __private = <optimized out>
        __oldval = <optimized out>
#1  __pthread_kill_internal (signo=6, threadid=<optimized out>) at ./nptl/pthread_kill.c:78
#2  __GI___pthread_kill (threadid=<optimized out>, signo=signo@entry=6) at ./nptl/pthread_kill.c:89
#3  0x00007ffff2c4527e in __GI_raise (sig=sig@entry=6) at ../sysdeps/posix/raise.c:26
        ret = <optimized out>
#4  0x00007ffff2c288ff in __GI_abort () at ./stdlib/abort.c:79
        save_stage = 1
        act = {__sigaction_handler = {sa_handler = 0x20, sa_sigaction = 0x20}, sa_mask = {__val = {93825031504560, 0, 7, 93825030612379, 93825030612368, 0, 4, 47244640256, 0, 140737488333640, 18446744073709551344, 11, 93825031504544, 140737488333680, 140737266769358, 140737268172000}}, sa_flags = -1263898112, sa_restorer = 0x7fffffffab70}
#5  0x00007ffff2c2881b in __assert_fail_base (fmt=0x7ffff2dd01e8 "%s%s%s:%u: %s%sAssertion `%s' failed.\n%n", assertion=assertion@entry=0x7ffff55c2256 "channel <= 15", file=file@entry=0x7ffff55c2230 "../libs/midi++2/midi++/midnam_patch.h", line=line@entry=394, function=function@entry=0x7ffff55c21d0 "const std::string& MIDI::Name::CustomDeviceMode::channel_name_set_name_by_channel(uint8_t)") at ./assert/assert.c:96
        str = 0x555557ac82b0 "\350C\2000PU"
        total = 4096
#6  0x00007ffff2c3b517 in __assert_fail (assertion=0x7ffff55c2256 "channel <= 15", file=0x7ffff55c2230 "../libs/midi++2/midi++/midnam_patch.h", line=394, function=0x7ffff55c21d0 "const std::string& MIDI::Name::CustomDeviceMode::channel_name_set_name_by_channel(uint8_t)") at ./assert/assert.c:105
#7  0x00007ffff558ea4d in MIDI::Name::CustomDeviceMode::channel_name_set_name_by_channel[abi:cxx11](unsigned char) (this=0x55555c7a5210, channel=48 '0') at ../libs/midi++2/midi++/midnam_patch.h:394
        __PRETTY_FUNCTION__ = "const std::string& MIDI::Name::CustomDeviceMode::channel_name_set_name_by_channel(uint8_t)"
#8  0x00007ffff558ae64 in MIDI::Name::MasterDeviceNames::channel_name_set_by_channel (this=0x55555be76200, mode="Drumkit Keymap", channel=48 '0') at ../libs/midi++2/midnam_patch.cc:681
        cdm = std::shared_ptr<MIDI::Name::CustomDeviceMode> (use count 2, weak count 0) = {get() = 0x55555c7a5210}
        cns = std::shared_ptr<MIDI::Name::ChannelNameSet> (use count -1878896504, weak count -129660089) = {get() = 0x7fffffffacf0}
#9  0x00007ffff558af2b in MIDI::Name::MasterDeviceNames::find_patch (this=0x55555be76200, mode="Drumkit Keymap", channel=48 '0', key=...) at ../libs/midi++2/midnam_patch.cc:688
        cns = std::shared_ptr<MIDI::Name::ChannelNameSet> (use count -1878896504, weak count -129660089) = {get() = 0x7fffffffacf0}
#10 0x00007ffff558b43b in MIDI::Name::MasterDeviceNames::note_name (this=0x55555be76200, mode_name="Drumkit Keymap", channel=48 '0', bank=0, program=0 '\000', number=0 '\000') at ../libs/midi++2/midnam_patch.cc:746
        note_names = std::shared_ptr<const MIDI::Name::NoteNameList> (empty) = {get() = 0x0}
        patch = <error reading variable: Cannot access memory at address 0xfffffffffffffef8>
        note = std::shared_ptr<const MIDI::Name::Note> (use count -2092374647, weak count -1991765781) = {get() = 0x7fffffffada0}
#11 0x00007ffff6b97bc9 in ARDOUR::InstrumentInfo::get_note_name[abi:cxx11](unsigned short, unsigned char, unsigned char, unsigned char) const (this=0x55555d4d4b88, bank=0, program=0 '\000', channel=48 '0', note=0 '\000') at ../libs/ardour/instrument_info.cc:151
        dev_names = std::shared_ptr<MIDI::Name::MasterDeviceNames> (use count 4, weak count 0) = {get() = 0x55555be76200}
#12 0x00005555569687d9 in PianoRollHeaderBase::get_note_name (this=0x55555c7a28a0, note=0) at ../gtk2_ardour/prh_base.cc:466
        name = ""
        rtn = {name = "", from_midnam = 128}
        ii = 0x55555d4d4b88
        midnam_channel = 48
#13 0x0000555556968662 in PianoRollHeaderBase::instrument_info_change (this=0x55555c7a28a0) at ../gtk2_ardour/prh_base.cc:441
        i = 0
#14 0x000055555681b39e in Pianoroll::set_region (this=0x55555cee3070, region=std::shared_ptr<ARDOUR::Region> (empty) = {...}) at ../gtk2_ardour/pianoroll.cc:1859
        r = <error reading variable: Cannot access memory at address 0xfffffffffffffef8>
        rvm = {first = <error reading variable: Cannot access memory at address 0xc9c0940fc0860006>, second = 0x894855fa1e0ff3c3}
        lowest_note = 127 '\177'
        highest_note = 0 '\000'
        __PRETTY_FUNCTION__ = "virtual void Pianoroll::set_region(std::shared_ptr<ARDOUR::Region>)"
#15 0x000055555681c88d in Pianoroll::remove_regions (this=0x55555cee3070) at ../gtk2_ardour/pianoroll.cc:1999
        mvs = std::vector of length 0, capacity 0
#16 0x0000555555ff21d4 in CueEditor::set_trigger (this=0x55555cee3070, tref=...) at ../gtk2_ardour/cue_editor.cc:1381
        __tms = {scope = @0x55555cee30d8}
        trigger = std::shared_ptr<ARDOUR::Trigger> (use count 2, weak count 0) = {get() = 0x55555d4e0cd0}
        st = 0x55555d4d3dd0
        __PRETTY_FUNCTION__ = "virtual void CueEditor::set_trigger(ARDOUR::TriggerReference&)"
        dur = {bars = 1, beats = 0, ticks = 0}
#17 0x0000555556ec0053 in TriggerPage::selection_changed (this=0x55556015deb0) at ../gtk2_ardour/trigger_page.cc:600
        selection = Python Exception <class 'AttributeError'>: 'NoneType' object has no attribute 'pointer'
Python Exception <class 'AttributeError'>: 'NoneType' object has no attribute 'pointer'
Python Exception <class 'AttributeError'>: 'NoneType' object has no attribute 'pointer'
Python Exception <class 'AttributeError'>: 'NoneType' object has no attribute 'pointer'
Python Exception <class 'AttributeError'>: 'NoneType' object has no attribute 'pointer'
Python Exception <class 'AttributeError'>: 'NoneType' object has no attribute 'pointer'
Python Exception <class 'AttributeError'>: 'NoneType' object has no attribute 'pointer'
Python Exception <class 'AttributeError'>: 'NoneType' object has no attribute 'pointer'
Python Exception <class 'AttributeError'>: 'NoneType' object has no attribute 'pointer'
Python Exception <class 'AttributeError'>: 'NoneType' object has no attribute 'pointer'
Python Exception <class 'AttributeError'>: 'NoneType' object has no attribute 'pointer'
Python Exception <class 'AttributeError'>: 'NoneType' object has no attribute 'pointer'
Python Exception <class 'AttributeError'>: 'NoneType' object has no attribute 'pointer'
@0x5555604bf6c0: {<sigc::trackable> = {callback_list_ = 0x0}, <PBD::ScopedConnectionList> = {_vptr.ScopedConnectionList = 0x55555772d318 <vtable for Selection+16>, _scoped_connection_lock = {_mutex = {<std::__mutex_base> = {_M_mutex = {__data = {__lock = 0, __count = 0, __owner = 0, __nusers = 0, __kind = 0, __spins = 0, __elision = 0, __list = {__prev = 0x0, __next = 0x0}}, __size = '\000' <repeats 39 times>, __align = 0}}, <No data fields>}}, _scoped_connection_list = std::__cxx11::list}, tracks = {<TrackViewList> = {<std::__cxx11::list<TimeAxisView*, std::allocator<TimeAxisView*> >> = empty std::__cxx11::list, _vptr.TrackViewList = 0x555557788ed0 <vtable for TrackSelection+16>}, <No data fields>}, regions = {<std::__cxx11::list<RegionView*, std::allocator<RegionView*> >> = empty std::__cxx11::list, pending = empty std::__cxx11::list, _bylayer = empty std::__cxx11::list}, time = {<std::__cxx11::list<ARDOUR::TimelineRange, std::allocator<ARDOUR::TimelineRange> >> = empty std::__cxx11::list, <No data fields>}, lines = {<std::__cxx11::list<std::shared_ptr<ARDOUR::AutomationList>, std::allocator<std::shared_ptr<ARDOUR::AutomationList> > >> = empty std::__cxx11::list, <No data fields>}, playlists = {<std::__cxx11::list<std::shared_ptr<ARDOUR::Playlist>, std::allocator<std::shared_ptr<ARDOUR::Playlist> > >> = empty std::__cxx11::list, <No data fields>}, points = {<std::__cxx11::list<ControlPoint*, std::allocator<ControlPoint*> >> = empty std::__cxx11::list, <No data fields>}, markers = {<std::__cxx11::list<ArdourMarker*, std::allocator<ArdourMarker*> >> = empty std::__cxx11::list, <No data fields>}, triggers = {<std::__cxx11::list<TriggerEntry*, std::allocator<TriggerEntry*> >> = std::__cxx11::list, <No data fields>}, midi_notes = {<std::__cxx11::list<MidiCutBuffer*, std::allocator<MidiCutBuffer*> >> = empty std::__cxx11::list, <No data fields>}, TracksChanged = {<sigc::signal0<void, sigc::nil>> = {<sigc::signal_base> = {<sigc::trackable> = {callback_list_ = 0x0}, impl_ = 0x555560546c80}, <No data fields>}, <No data fields>}, RegionsChanged = {<sigc::signal0<void, sigc::nil>> = {<sigc::signal_base> = {<sigc::trackable> = {callback_list_ = 0x0}, impl_ = 0x555560b2a9a0}, <No data fields>}, <No data fields>}, TimeChanged = {<sigc::signal0<void, sigc::nil>> = {<sigc::signal_base> = {<sigc::trackable> = {callback_list_ = 0x0}, impl_ = 0x555558f11ca0}, <No data fields>}, <No data fields>}, LinesChanged = {<sigc::signal0<void, sigc::nil>> = {<sigc::signal_base> = {<sigc::trackable> = {callback_list_ = 0x0}, impl_ = 0x55555c36e390}, <No data fields>}, <No data fields>}, PlaylistsChanged = {<sigc::signal0<void, sigc::nil>> = {<sigc::signal_base> = {<sigc::trackable> = {callback_list_ = 0x0}, impl_ = 0x55555c36e480}, <No data fields>}, <No data fields>}, PointsChanged = {<sigc::signal0<void, sigc::nil>> = {<sigc::signal_base> = {<sigc::trackable> = {callback_list_ = 0x0}, impl_ = 0x555560b2a910}, <No data fields>}, <No data fields>}, MarkersChanged = {<sigc::signal0<void, sigc::nil>> = {<sigc::signal_base> = {<sigc::trackable> = {callback_list_ = 0x0}, impl_ = 0x555560546ec0}, <No data fields>}, <No data fields>}, MidiNotesChanged = {<sigc::signal0<void, sigc::nil>> = {<sigc::signal_base> = {<sigc::trackable> = {callback_list_ = 0x0}, impl_ = 0x55555c36e750}, <No data fields>}, <No data fields>}, TriggersChanged = {<sigc::signal0<void, sigc::nil>> = {<sigc::signal_base> = {<sigc::trackable> = {callback_list_ = 0x0}, impl_ = 0x55555c36e860}, <No data fields>}, <No data fields>}, pending_midi_note_selection = empty std::__cxx11::list, editor = 0x55555ca963c0, next_time_id = 0, manage_libardour_selection = true}
        ref = {weak_box = std::weak_ptr<class ARDOUR::TriggerBox> (use count 4, weak count 20) = {get() = 0x55555d4da0e0}, _slot = 2}
        box = std::shared_ptr<ARDOUR::TriggerBox> (use count 4, weak count 20) = {get() = 0x55555d4da0e0}
#18 0x0000555556ece598 in sigc::bound_mem_functor0<void, TriggerPage>::operator() (this=0x5555653d4eb8) at /usr/include/sigc++-2.0/sigc++/functors/mem_fun.h:1991
#19 0x0000555556ecc5b2 in sigc::adaptor_functor<sigc::bound_mem_functor0<void, TriggerPage> >::operator() (this=0x5555653d4eb0) at /usr/include/sigc++-2.0/sigc++/adaptors/adaptor_trait.h:256
#20 0x0000555556eca360 in sigc::internal::slot_call<sigc::bound_mem_functor0<void, TriggerPage>, void>::call_it (rep=0x5555653d4e80) at /usr/include/sigc++-2.0/sigc++/functors/slot.h:483
        typed_rep = 0x5555653d4e80
#21 0x0000555555da71a6 in sigc::internal::signal_emit0<void, sigc::nil>::emit (impl=0x55555c36e860) at /usr/include/sigc++-2.0/sigc++/signal.h:798
        slot = @0x5555653d4f20: {<sigc::functor_base> = {<No data fields>}, rep_ = 0x5555653d4e80, blocked_ = false}
        __for_range = Python Exception <class 'AttributeError'>: 'NoneType' object has no attribute 'pointer'
Python Exception <class 'AttributeError'>: 'NoneType' object has no attribute 'pointer'
@0x7fffffffb460: {slots_ = std::__cxx11::list, placeholder = }
        __for_begin = {<sigc::functor_base> = {<No data fields>}, rep_ = 0x5555653d4e80, blocked_ = false}
        __for_end = {<sigc::functor_base> = {<No data fields>}, rep_ = 0x0, blocked_ = false}
        exec = {sig_ = 0x55555c36e860}
        slots = Python Exception <class 'AttributeError'>: 'NoneType' object has no attribute 'pointer'
Python Exception <class 'AttributeError'>: 'NoneType' object has no attribute 'pointer'
{slots_ = std::__cxx11::list, placeholder = }
#22 0x0000555555dab8d2 in sigc::signal0<void, sigc::nil>::emit (this=0x5555604bf8a0) at /usr/include/sigc++-2.0/sigc++/signal.h:2809
#23 0x0000555555da911a in sigc::signal0<void, sigc::nil>::operator() (this=0x5555604bf8a0) at /usr/include/sigc++-2.0/sigc++/signal.h:2825
#24 0x0000555556c7cfac in Selection::add (this=0x5555604bf6c0, te=0x555565876620) at ../gtk2_ardour/selection.cc:1679
#25 0x0000555556c7cf68 in Selection::set (this=0x5555604bf6c0, te=0x555565876620) at ../gtk2_ardour/selection.cc:1672
#26 0x0000555556f0dfba in TriggerEntry::name_button_event (this=0x555565876620, ev=0x7fffffffb930) at ../gtk2_ardour/triggerbox_ui.cc:656
#27 0x0000555556f16c70 in sigc::bound_mem_functor1<bool, TriggerEntry, _GdkEvent*>::operator() (this=0x555565879a68, _A_a1=@0x7fffffffb750: 0x7fffffffb930) at /usr/include/sigc++-2.0/sigc++/functors/mem_fun.h:2066
#28 0x0000555556f159bb in sigc::adaptor_functor<sigc::bound_mem_functor1<bool, TriggerEntry, _GdkEvent*> >::operator()<_GdkEvent* const&> (this=0x555565879a60, _A_arg1=@0x7fffffffb750: 0x7fffffffb930) at /usr/include/sigc++-2.0/sigc++/adaptors/adaptor_trait.h:89
#29 0x0000555556f1439f in sigc::internal::slot_call<sigc::bound_mem_functor1<bool, TriggerEntry, _GdkEvent*>, bool, _GdkEvent*>::call_it (rep=0x555565879a30, a_#0=@0x7fffffffb750: 0x7fffffffb930) at /usr/include/sigc++-2.0/sigc++/functors/slot.h:451
        typed_rep = 0x555565879a30
#30 0x0000555556f17d75 in sigc::internal::signal_emit1<bool, _GdkEvent*, ArdourCanvas::Item::EventAccumulator<bool> >::operator() (this=0x7fffffffb678, _A_slot=...) at /usr/include/sigc++-2.0/sigc++/signal.h:860
#31 0x0000555556f170ab in sigc::internal::slot_iterator_buf<sigc::internal::signal_emit1<bool, _GdkEvent*, ArdourCanvas::Item::EventAccumulator<bool> >, bool>::operator* (this=0x7fffffffb620) at /usr/include/sigc++-2.0/sigc++/signal.h:319
#32 0x0000555556f15eb9 in ArdourCanvas::Item::EventAccumulator<bool>::operator()<sigc::internal::slot_iterator_buf<sigc::internal::signal_emit1<bool, _GdkEvent*, ArdourCanvas::Item::EventAccumulator<bool> >, bool> > (this=0x7fffffffb66f, first=..., last=...) at ../libs/canvas/canvas/item.h:258
#33 0x0000555556f14b07 in sigc::internal::signal_emit1<bool, _GdkEvent*, ArdourCanvas::Item::EventAccumulator<bool> >::emit (impl=0x555565878bd0, _A_a1=@0x7fffffffb750: 0x7fffffffb930) at /usr/include/sigc++-2.0/sigc++/signal.h:879
        accumulator = {<No data fields>}
        exec = {sig_ = 0x555565878bd0}
        slots = Python Exception <class 'AttributeError'>: 'NoneType' object has no attribute 'pointer'
Python Exception <class 'AttributeError'>: 'NoneType' object has no attribute 'pointer'
{slots_ = std::__cxx11::list, placeholder = }
        self = {_A_a1_ = @0x7fffffffb750}
#34 0x0000555556f13459 in sigc::signal1<bool, _GdkEvent*, ArdourCanvas::Item::EventAccumulator<bool> >::emit (this=0x5555658785b0, _A_a1=@0x7fffffffb750: 0x7fffffffb930) at /usr/include/sigc++-2.0/sigc++/signal.h:2965
#35 0x0000555556f12307 in sigc::signal1<bool, _GdkEvent*, ArdourCanvas::Item::EventAccumulator<bool> >::operator() (this=0x5555658785b0, _A_a1=@0x7fffffffb750: 0x7fffffffb930) at /usr/include/sigc++-2.0/sigc++/signal.h:2981
#36 0x00007ffff5221da8 in ArdourCanvas::GtkCanvas::deliver_event (this=0x555565817360, event=0x7fffffffb930) at ../libs/canvas/canvas.cc:937
        parent = 0x555565876620
        w = "Rectangle"
        n = "slot_selector_button"
        event_item = 0x555565878540
        item = 0x555565878540
#37 0x00007ffff5223b74 in ArdourCanvas::GtkCanvas::on_button_release_event (this=0x555565817360, ev=0x555565debbc0) at ../libs/canvas/canvas.cc:1294
        copy = {type = GDK_BUTTON_RELEASE, any = {type = GDK_BUTTON_RELEASE, window = 0x55556596b030, send_event = 0 '\000'}, expose = {type = GDK_BUTTON_RELEASE, window = 0x55556596b030, send_event = 0 '\000', area = {x = 111657881, y = 0, width = 1078296576, height = 0}, region = 0x0, count = 272}, no_expose = {type = GDK_BUTTON_RELEASE, window = 0x55556596b030, send_event = 0 '\000'}, visibility = {type = GDK_BUTTON_RELEASE, window = 0x55556596b030, send_event = 0 '\000', state = (GDK_VISIBILITY_PARTIAL | unknown: 0x6a7c398)}, motion = {type = GDK_BUTTON_RELEASE, window = 0x55556596b030, send_event = 0 '\000', time = 111657881, x = 43, y = 44, axes = 0x0, state = 272, is_hint = 1, device = 0x5555581f2c00, x_root = 2356, y_root = 285}, button = {type = GDK_BUTTON_RELEASE, window = 0x55556596b030, send_event = 0 '\000', time = 111657881, x = 43, y = 44, axes = 0x0, state = 272, button = 1, device = 0x5555581f2c00, x_root = 2356, y_root = 285}, touch = {type = GDK_BUTTON_RELEASE, window = 0x55556596b030, send_event = 0 '\000', time = 111657881, x = 43, y = 44, state = 0, sequence = 0, flags = 272, deviceid = 1, x_root = 4.6355728499006345e-310, y_root = 2356}, scroll = {type = GDK_BUTTON_RELEASE, window = 0x55556596b030, send_event = 0 '\000', time = 111657881, x = 43, y = 44, state = 0, direction = GDK_SCROLL_UP, device = 0x100000110, x_root = 4.6355728499006345e-310, y_root = 2356, has_deltas = 0, delta_x = 0, delta_y = 0}, key = {type = GDK_BUTTON_RELEASE, window = 0x55556596b030, send_event = 0 '\000', time = 111657881, state = 0, keyval = 1078296576, length = 0, string = 0x0, hardware_keycode = 272, group = 0 '\000', is_modifier = 0}, crossing = {type = GDK_BUTTON_RELEASE, window = 0x55556596b030, send_event = 0 '\000', subwindow = 0x4045800000000000, time = 0, x = 0, y = 2.121995925351128e-314, x_root = 4.6355728499006345e-310, y_root = 2356, mode = GDK_CROSSING_NORMAL, detail = 1081200640, focus = 0, state = 0}, focus_change = {type = GDK_BUTTON_RELEASE, window = 0x55556596b030, send_event = 0 '\000', in = 0}, configure = {type = GDK_BUTTON_RELEASE, window = 0x55556596b030, send_event = 0 '\000', x = 111657881, y = 0, width = 1078296576, height = 0}, property = {type = GDK_BUTTON_RELEASE, window = 0x55556596b030, send_event = 0 '\000', atom = 0x4045800000000000, time = 0, state = 1078329344}, selection = {type = GDK_BUTTON_RELEASE, window = 0x55556596b030, send_event = 0 '\000', selection = 0x4045800000000000, target = 0x4046000000000000, property = 0x0, time = 272, requestor = 1}, owner_change = {type = GDK_BUTTON_RELEASE, window = 0x55556596b030, send_event = 0 '\000', owner = 111657881, reason = GDK_OWNER_CHANGE_NEW_OWNER, selection = 0x4046000000000000, time = 0, selection_time = 0}, proximity = {type = GDK_BUTTON_RELEASE, window = 0x55556596b030, send_event = 0 '\000', time = 111657881, device = 0x4045800000000000}, client = {type = GDK_BUTTON_RELEASE, window = 0x55556596b030, send_event = 0 '\000', message_type = 0x4045800000000000, data_format = 0, data = {b = "\000\000\000\000\000\000\000\000\020\001\000\000\001\000\000\000\000,\037X", s = {0, 0, 0, 0, 272, 0, 1, 0, 11264, 22559}, l = {0, 4294967568, 93825039019008, 4657399313863802880, 4643721389214269440}}}, dnd = {type = GDK_BUTTON_RELEASE, window = 0x55556596b030, send_event = 0 '\000', context = 0x4045800000000000, time = 0, x_root = 0, y_root = 16454}, window_state = {type = GDK_BUTTON_RELEASE, window = 0x55556596b030, send_event = 0 '\000', changed_mask = (GDK_WINDOW_STATE_WITHDRAWN | GDK_WINDOW_STATE_STICKY | GDK_WINDOW_STATE_FULLSCREEN | unknown: 0x6a7c380), new_window_state = 0}, setting = {type = GDK_BUTTON_RELEASE, window = 0x55556596b030, send_event = 0 '\000', action = (GDK_SETTING_ACTION_CHANGED | unknown: 0x6a7c398), name = 0x4045800000000000 <error: Cannot access memory at address 0x4045800000000000>}, grab_broken = {type = GDK_BUTTON_RELEASE, window = 0x55556596b030, send_event = 0 '\000', keyboard = 111657881, implicit = 0, grab_window = 0x4046000000000000}}
        winpos = {x = 43, y = 44}
        where = {x = 43, y = 44}
#38 0x00007ffff45b87ad in Gtk::Widget_Class::button_release_event_callback (self=0x5555658243c0, p0=0x555565debbc0) at ../libs/tk/ytkmm/widget.cc:4330
        obj = 0x5555658175c0
        obj_base = 0x5555658176b8
        base = 0x55555822f120
#39 0x00007ffff3d9566a in _gtk_marshal_BOOLEAN__BOXED (closure=0x55555822f120, return_value=0x7fffffffbbd0, n_param_values=2, param_values=0x7fffffffbc60, invocation_hint=0x7fffffffbbb0, marshal_data=0x7ffff45b8708 <Gtk::Widget_Class::button_release_event_callback(_GtkWidget*, _GdkEventButton*)>) at ../libs/tk/ytk/gtkmarshalers.c:84
        cc = 0x55555822f120
        data1 = 0x5555658243c0
        data2 = 0x555558203e70
        callback = 0x7ffff45b8708 <Gtk::Widget_Class::button_release_event_callback(_GtkWidget*, _GdkEventButton*)>
        v_return = 0
        __func__ = "_gtk_marshal_BOOLEAN__BOXED"
#40 0x00007ffff3b1b2fa in g_closure_invoke () at /lib/x86_64-linux-gnu/libgobject-2.0.so.0
#41 0x00007ffff3b4af98 in ??? () at /lib/x86_64-linux-gnu/libgobject-2.0.so.0
#42 0x00007ffff3b3aef2 in ??? () at /lib/x86_64-linux-gnu/libgobject-2.0.so.0
#43 0x00007ffff3b3b7c1 in g_signal_emit_valist () at /lib/x86_64-linux-gnu/libgobject-2.0.so.0
#44 0x00007ffff3b3b883 in g_signal_emit () at /lib/x86_64-linux-gnu/libgobject-2.0.so.0
#45 0x00007ffff3f2fe9b in gtk_widget_event_internal (widget=0x5555658243c0, event=0x555565debbc0) at ../libs/tk/ytk/gtkwidget.c:5058
        signal_num = 22
        return_val = 0
#46 0x00007ffff3f2f957 in IA__gtk_widget_event (widget=0x5555658243c0, event=0x555565debbc0) at ../libs/tk/ytk/gtkwidget.c:4846
        __func__ = "IA__gtk_widget_event"
#47 0x00007ffff3d9355a in IA__gtk_propagate_event (widget=0x5555658243c0, event=0x555565debbc0) at ../libs/tk/ytk/gtkmain.c:2465
        tmp = 0x0
        handled_event = 0
        __func__ = "IA__gtk_propagate_event"
#48 0x00007ffff3d91e12 in IA__gtk_main_do_event (event=0x555565debbc0) at ../libs/tk/ytk/gtkmain.c:1654
        event_widget = 0x5555658243c0
        grab_widget = 0x5555658243c0
        window_group = 0x5555581fc230
        rewritten_event = 0x0
        tmp_list = Python Exception <class 'gdb.MemoryError'>: Cannot access memory at address 0x4
#49 0x00007ffff4bb488c in gdk_event_dispatch (source=0x5555581f0190, callback=0x0, user_data=0x0) at ../libs/tk/ydk/x11/gdkevents-x11.c:2541
        display = 0x5555581e6b10
        event = 0x555565debbc0
#50 0x00007ffff4114585 in ??? () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#51 0x00007ffff4173977 in ??? () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#52 0x00007ffff4114f47 in g_main_loop_run () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#53 0x00007ffff3d9131f in IA__gtk_main () at ../libs/tk/ytk/gtkmain.c:1221
        tmp_list = 0x0
        functions = 0x0
        init = 0x7ffff5141050
        loop = 0x555557ffd5d0
#54 0x00007ffff451c2a1 in Gtk::Main::run_impl (this=0x5555581d19c0) at ../libs/tk/ytkmm/main.cc:537
#55 0x00007ffff451c03d in Gtk::Main::run () at ../libs/tk/ytkmm/main.cc:480
#56 0x00007ffff4d7e524 in Gtkmm2ext::UI::run (this=0x5555581c7380, old_receiver=...) at ../libs/gtkmm2ext/gtk_ui.cc:319
#57 0x00005555565c6458 in main (argc=1, argv=0x7fffffffc648) at ../gtk2_ardour/main.cc:502