instantiate
Finding host feature http://lv2plug.in/ns/ext/urid#map
Found host feature http://lv2plug.in/ns/ext/urid#map
Finding host feature http://lv2plug.in/ns/ext/urid#unmap
Found host feature http://lv2plug.in/ns/ext/urid#unmap
get event types
Mapping uri http://lv2plug.in/ns/ext/midi#MidiEvent
Mapped uri http://lv2plug.in/ns/ext/midi#MidiEvent to 12
Mapping uri http://lv2plug.in/ns/ext/patch#Get
Mapped uri http://lv2plug.in/ns/ext/patch#Get to 21
Mapping uri http://lv2plug.in/ns/ext/patch#Set
Mapped uri http://lv2plug.in/ns/ext/patch#Set to 22
initialize done
connect_port 0
connect_port done 0
connect_port 1
connect_port done 1
connect_port 2
connect_port done 2
connect_port 3
connect_port done 3
connect_port 4
connect_port done 4
connect_port 5
connect_port done 5
connect_port 6
connect_port done 6
connect_port 7
connect_port done 7
connect_port 8
connect_port done 8
connect_port 9
connect_port done 9
connect_port 10
connect_port done 10
connect_port 2
connect_port done 2
connect_port 3
connect_port done 3
connect_port 4
connect_port done 4
connect_port 5
connect_port done 5
connect_port 6
connect_port done 6
connect_port 7
connect_port done 7
connect_port 8
connect_port done 8
connect_port 9
connect_port done 9
connect_port 10
connect_port done 10

(ardour-4.7.0:29879): glibmm-ERROR **:
unhandled exception (type std::exception) in signal handler:
what: basic_string::_M_construct null not valid


Thread 1 "ardour-4.7.0" received signal SIGTRAP, Trace/breakpoint trap.
0x00007ffff5565011 in ?? () from /usr/lib/libglib-2.0.so.0
(gdb) bt
#0  0x00007ffff5565011 in  () at /usr/lib/libglib-2.0.so.0
#1  0x00007ffff5566067 in g_log_default_handler () at /usr/lib/libglib-2.0.so.0
#2  0x00007ffff5566374 in g_logv () at /usr/lib/libglib-2.0.so.0
#3  0x00007ffff556657f in g_log () at /usr/lib/libglib-2.0.so.0
#4  0x00007ffff5ad226f in Glib::exception_handlers_invoke() () at /usr/lib/libglibmm-2.4.so.1
#5  0x00007ffff5ad89c7 in Glib::SignalProxyNormal::slot0_void_callback(_GObject*, void*) () at /usr/lib/libglibmm-2.4.so.1
#6  0x00007ffff5837f75 in g_closure_invoke () at /usr/lib/libgobject-2.0.so.0
#7  0x00007ffff584a053 in  () at /usr/lib/libgobject-2.0.so.0
#8  0x00007ffff5852bcc in g_signal_emit_valist () at /usr/lib/libgobject-2.0.so.0
#9  0x00007ffff5852faf in g_signal_emit () at /usr/lib/libgobject-2.0.so.0
#10 0x00007ffff4f1564e in gtk_widget_activate () at /usr/lib/libgtk-x11-2.0.so.0
#11 0x00007ffff4e104fd in gtk_menu_shell_activate_item () at /usr/lib/libgtk-x11-2.0.so.0
#12 0x00007ffff4e10866 in  () at /usr/lib/libgtk-x11-2.0.so.0
#13 0x00007ffff4dfe7ac in  () at /usr/lib/libgtk-x11-2.0.so.0
#14 0x00007ffff5837f75 in g_closure_invoke () at /usr/lib/libgobject-2.0.so.0
#15 0x00007ffff584a37d in  () at /usr/lib/libgobject-2.0.so.0
#16 0x00007ffff585266f in g_signal_emit_valist () at /usr/lib/libgobject-2.0.so.0
#17 0x00007ffff5852faf in g_signal_emit () at /usr/lib/libgobject-2.0.so.0
#18 0x00007ffff4f168cc in  () at /usr/lib/libgtk-x11-2.0.so.0
#19 0x00007ffff4dfcf74 in gtk_propagate_event () at /usr/lib/libgtk-x11-2.0.so.0
#20 0x00007ffff4dfd32b in gtk_main_do_event () at /usr/lib/libgtk-x11-2.0.so.0
#21 0x00007ffff4a7446c in  () at /usr/lib/libgdk-x11-2.0.so.0
#22 0x00007ffff555f5a7 in g_main_context_dispatch () at /usr/lib/libglib-2.0.so.0
#23 0x00007ffff555f810 in  () at /usr/lib/libglib-2.0.so.0
#24 0x00007ffff555fb32 in g_main_loop_run () at /usr/lib/libglib-2.0.so.0
#25 0x00007ffff4dfc3a7 in gtk_main () at /usr/lib/libgtk-x11-2.0.so.0
#26 0x00007ffff76cf8d6 in Gtkmm2ext::UI::run(Receiver&) () at /usr/lib/ardour4/libgtkmm2ext.so.0
#27 0x000000000048d1f8 in  ()
#28 0x00007ffff0fc1291 in __libc_start_main () at /usr/lib/libc.so.6
#29 0x0000000000497299 in  ()