Thread 37 (Thread 0x7fff977fe700 (LWP 7531)):
#0  0x00007ffff0289d84 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/x86_64-linux-gnu/libpthread.so.0
#1  0x00007ffff44bf524 in g_cond_wait () from /opt/Ardour-4.2.179-dbg/lib/libglib-2.0.so.0
#2  0x00007ffff79451ed in ArdourCanvas::WaveView::drawing_thread () at ../libs/canvas/wave_view.cc:1536
#3  0x0000000000caa9f5 in sigc::pointer_functor0<void>::operator() (this=0x2485758)
    at /home/ardour/linux-x86_64/gtk/inst/include/sigc++-2.0/sigc++/functors/ptr_fun.h:77
#4  0x0000000000ca803e in sigc::adaptor_functor<sigc::pointer_functor0<void> >::operator() (this=0x2485750)
    at /home/ardour/linux-x86_64/gtk/inst/include/sigc++-2.0/sigc++/adaptors/adaptor_trait.h:251
#5  0x0000000000ca4853 in sigc::internal::slot_call0<sigc::pointer_functor0<void>, void>::call_it (rep=0x2485720)
    at /home/ardour/linux-x86_64/gtk/inst/include/sigc++-2.0/sigc++/functors/slot.h:103
#6  0x00007ffff49fdb72 in ?? () from /opt/Ardour-4.2.179-dbg/lib/libglibmm-2.4.so.1
#7  0x00007ffff449e7f5 in ?? () from /opt/Ardour-4.2.179-dbg/lib/libglib-2.0.so.0
#8  0x00007ffff0285e9a in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0
#9  0x00007fffed32138d in clone () from /lib/x86_64-linux-gnu/libc.so.6
#10 0x0000000000000000 in ?? ()

Thread 33 (Thread 0x7fff97fff700 (LWP 7527)):
#0  0x00007ffff028d52d in nanosleep () from /lib/x86_64-linux-gnu/libpthread.so.0
#1  0x00007ffff44a0298 in g_usleep () from /opt/Ardour-4.2.179-dbg/lib/libglib-2.0.so.0
#2  0x00007ffff6895286 in ARDOUR::AutomationWatch::thread (this=0xf22e7e0) at ../libs/ardour/automation_watch.cc:153
#3  0x00007ffff6898701 in boost::_mfi::mf0<void, ARDOUR::AutomationWatch>::operator() (this=0x335a4e0, p=0xf22e7e0)
    at /home/ardour/linux-x86_64/gtk/inst/include/boost/bind/mem_fn_template.hpp:49
#4  0x00007ffff6898344 in boost::_bi::list1<boost::_bi::value<ARDOUR::AutomationWatch*> >::operator()<boost::_mfi::mf0<void, ARDOUR::AutomationWatch>, boost::_bi::list0> (this=0x335a4f0, f=..., a=...) at /home/ardour/linux-x86_64/gtk/inst/include/boost/bind/bind.hpp:253
#5  0x00007ffff6897f3f in boost::_bi::bind_t<void, boost::_mfi::mf0<void, ARDOUR::AutomationWatch>, boost::_bi::list1<boost::_bi::value<ARDOUR::AutomationWatch*> > >::operator() (this=0x335a4e0) at /home/ardour/linux-x86_64/gtk/inst/include/boost/bind/bind_template.hpp:20
#6  0x00007ffff6897eca in sigc::adaptor_functor<boost::_bi::bind_t<void, boost::_mfi::mf0<void, ARDOUR::AutomationWatch>, boost::_bi::list1<boost::_bi::value<ARDOUR::AutomationWatch*> > > >::operator() (this=0x335a4e0)
    at /home/ardour/linux-x86_64/gtk/inst/include/sigc++-2.0/sigc++/adaptors/adaptor_trait.h:251
#7  0x00007ffff6897aca in sigc::internal::slot_call0<boost::_bi::bind_t<void, boost::_mfi::mf0<void, ARDOUR::AutomationWatch>, boost::_bi::list1<boost::_bi::value<ARDOUR::AutomationWatch*> > >, void>::call_it (rep=0x335a4b0) at /home/ardour/linux-x86_64/gtk/inst/include/sigc++-2.0/sigc++/functors/slot.h:103
#8  0x00007ffff49fdb72 in ?? () from /opt/Ardour-4.2.179-dbg/lib/libglibmm-2.4.so.1
#9  0x00007ffff449e7f5 in ?? () from /opt/Ardour-4.2.179-dbg/lib/libglib-2.0.so.0
#10 0x00007ffff0285e9a in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0
#11 0x00007fffed32138d in clone () from /lib/x86_64-linux-gnu/libc.so.6
#12 0x0000000000000000 in ?? ()

---Type <return> to continue, or q <return> to quit---
Thread 32 (Thread 0x7fffc921c700 (LWP 7526)):
#0  0x00007ffff0289d84 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/x86_64-linux-gnu/libpthread.so.0
#1  0x00007ffff6c683ac in ARDOUR::Session::emit_thread_run (this=0x1f32fd0) at ../libs/ardour/session_process.cc:1313
#2  0x00007ffff6c68356 in ARDOUR::Session::emit_thread (arg=0x1f32fd0) at ../libs/ardour/session_process.cc:1302
#3  0x00007ffff0285e9a in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0
#4  0x00007fffed32138d in clone () from /lib/x86_64-linux-gnu/libc.so.6
#5  0x0000000000000000 in ?? ()

Thread 31 (Thread 0x7fffa4c0d700 (LWP 7525)):
#0  0x00000000006dfb10 in boost::shared_ptr<ARDOUR::AutomationControl>::shared_ptr (this=0x7fffa4c0c130)
    at /home/ardour/linux-x86_64/gtk/inst/include/boost/smart_ptr/shared_ptr.hpp:165
#1  0x00007fffa4d9aaa4 in ArdourSurface::Mackie::Control::control (this=0x0) at ../libs/surfaces/mackie/controls.h:69
#2  0x00007fffa4d9a1ff in ArdourSurface::MackieControlProtocol::master_fader_touch_press (this=0x2c17dc0) at ../libs/surfaces/mackie/mcp_buttons.cc:756
#3  0x00007fffa4d6c3e4 in ArdourSurface::MackieControlProtocol::handle_button_event (this=0x2c17dc0, surface=..., button=..., 
    bs=ArdourSurface::Mackie::press) at ../libs/surfaces/mackie/mackie_control_protocol.cc:1275
#4  0x00007fffa4dbfe9f in ArdourSurface::Mackie::Surface::handle_midi_note_on_message (this=0xa833710, ev=0xa847e81)
    at ../libs/surfaces/mackie/surface.cc:467
#5  0x00007fffa4dce98a in boost::_mfi::mf2<void, ArdourSurface::Mackie::Surface, MIDI::Parser&, MIDI::EventTwoBytes*>::operator() (this=0x7fff90033788, 
    p=0xa833710, a1=..., a2=0xa847e81) at /home/ardour/linux-x86_64/gtk/inst/include/boost/bind/mem_fn_template.hpp:280
#6  0x00007fffa4dcd2b0 in boost::_bi::list3<boost::_bi::value<ArdourSurface::Mackie::Surface*>, boost::arg<1>, boost::arg<2> >::operator()<boost::_mfi::mf2<void, ArdourSurface::Mackie::Surface, MIDI::Parser&, MIDI::EventTwoBytes*>, boost::_bi::list2<MIDI::Parser&, MIDI::EventTwoBytes*&> > (
    this=0x7fff90033798, f=..., a=...) at /home/ardour/linux-x86_64/gtk/inst/include/boost/bind/bind.hpp:392
#7  0x00007fffa4dcb98c in boost::_bi::bind_t<void, boost::_mfi::mf2<void, ArdourSurface::Mackie::Surface, MIDI::Parser&, MIDI::EventTwoBytes*>, boost::_bi::list3<boost::_bi::value<ArdourSurface::Mackie::Surface*>, boost::arg<1>, boost::arg<2> > >::operator()<MIDI::Parser, MIDI::EventTwoBytes*> (
    this=0x7fff90033788, a1=..., a2=@0x7fffa4c0c5d8: 0xa847e81) at /home/ardour/linux-x86_64/gtk/inst/include/boost/bind/bind_template.hpp:61
#8  0x00007fffa4dca5d7 in boost::detail::function::void_function_obj_invoker2<boost::_bi::bind_t<void, boost::_mfi::mf2<void, ArdourSurface::Mackie::Surface, MIDI::Parser&, MIDI::EventTwoBytes*>, boost::_bi::list3<boost::_bi::value<ArdourSurface::Mackie::Surface*>, boost::arg<1>, boost::arg<2> > >, void, MIDI::Parser&, MIDI::EventTwoBytes*>::invoke (function_obj_ptr=..., a0=..., a1=0xa847e81)
    at /home/ardour/linux-x86_64/gtk/inst/include/boost/function/function_template.hpp:153
#9  0x00007ffff5e6ead4 in boost::function2<void, MIDI::Parser&, MIDI::EventTwoBytes*>::operator() (this=0x7fff90033780, a0=..., a1=0xa847e81)
    at /home/ardour/linux-x86_64/gtk/inst/include/boost/function/function_template.hpp:760
#10 0x00007ffff5e6c922 in PBD::Signal2<void, MIDI::Parser&, MIDI::EventTwoBytes*, PBD::OptionalLastValue<void> >::operator() (this=0xa841c98, a1=..., 
    a2=0xa847e81) at /home/ardour/linux-x86_64/ardour/build/libs/pbd/pbd/signals_generated.h:1000
#11 0x00007ffff5e67792 in MIDI::Parser::signal (this=0xa841c50, msg=0xa847e80 "\220p\177f\024\001XYZ\001\006\";\001\006\"", <incomplete sequence \367>, 
    len=3) at ../libs/midi++2/parser.cc:690
#12 0x00007ffff5e670a8 in MIDI::Parser::scanner (this=0xa841c50, inbyte=127 '\177') at ../libs/midi++2/parser.cc:509
#13 0x00007ffff67e6c38 in ARDOUR::AsyncMIDIPort::read (this=0xa8339b0) at ../libs/ardour/async_midi_port.cc:291
#14 0x00007ffff67e6d04 in ARDOUR::AsyncMIDIPort::parse (this=0xa8339b0) at ../libs/ardour/async_midi_port.cc:304
---Type <return> to continue, or q <return> to quit---
#15 0x00007fffa4d6cb13 in ArdourSurface::MackieControlProtocol::midi_input_handler (this=0x2c17dc0, ioc=Glib::IO_IN, port=0xa837908)
    at ../libs/surfaces/mackie/mackie_control_protocol.cc:1319
#16 0x00007fffa4d944f0 in sigc::bound_mem_functor2<bool, ArdourSurface::MackieControlProtocol, Glib::IOCondition, MIDI::Port*>::operator() (
    this=0x2ce4650, _A_a1=@0x7fffa4c0ca84: Glib::IO_IN, _A_a2=@0x2ce4670: 0xa837908)
    at /home/ardour/linux-x86_64/gtk/inst/include/sigc++-2.0/sigc++/functors/mem_fun.h:1917
#17 0x00007fffa4d911cd in sigc::adaptor_functor<sigc::bound_mem_functor2<bool, ArdourSurface::MackieControlProtocol, Glib::IOCondition, MIDI::Port*> >::operator()<Glib::IOCondition const&, MIDI::Port*&> (this=0x2ce4648, _A_arg1=@0x7fffa4c0ca84: Glib::IO_IN, _A_arg2=@0x2ce4670: 0xa837908)
    at /home/ardour/linux-x86_64/gtk/inst/include/sigc++-2.0/sigc++/adaptors/adaptor_trait.h:103
#18 0x00007fffa4d8cb04 in sigc::bind_functor<-1, sigc::bound_mem_functor2<bool, ArdourSurface::MackieControlProtocol, Glib::IOCondition, MIDI::Port*>, MIDI::Port*, sigc::nil, sigc::nil, sigc::nil, sigc::nil, sigc::nil, sigc::nil>::operator()<Glib::IOCondition const&> (this=0x2ce4640, 
    _A_arg1=@0x7fffa4c0ca84: Glib::IO_IN) at /home/ardour/linux-x86_64/gtk/inst/include/sigc++-2.0/sigc++/adaptors/bind.h:1122
#19 0x00007fffa4d87942 in sigc::internal::slot_call1<sigc::bind_functor<-1, sigc::bound_mem_functor2<bool, ArdourSurface::MackieControlProtocol, Glib::IOCondition, MIDI::Port*>, MIDI::Port*, sigc::nil, sigc::nil, sigc::nil, sigc::nil, sigc::nil, sigc::nil>, bool, Glib::IOCondition>::call_it (rep=0x2ce4610, 
    a_1=@0x7fffa4c0ca84: Glib::IO_IN) at /home/ardour/linux-x86_64/gtk/inst/include/sigc++-2.0/sigc++/functors/slot.h:137
#20 0x00007ffff55ff791 in sigc::slot1<bool, Glib::IOCondition>::operator() (this=0xa837a38, _A_a1=@0x7fffa4c0ca84: Glib::IO_IN)
    at /home/ardour/linux-x86_64/gtk/inst/include/sigc++-2.0/sigc++/functors/slot.h:515
#21 0x00007ffff55ff4af in cross_thread_channel_call_receive_slot (condition=G_IO_IN, data=0xa837a28) at ../libs/pbd/crossthread.cc:49
#22 0x00007ffff4471c95 in g_main_context_dispatch () from /opt/Ardour-4.2.179-dbg/lib/libglib-2.0.so.0
#23 0x00007ffff4473b08 in ?? () from /opt/Ardour-4.2.179-dbg/lib/libglib-2.0.so.0
#24 0x00007ffff4473bb5 in g_main_loop_run () from /opt/Ardour-4.2.179-dbg/lib/libglib-2.0.so.0
#25 0x00007ffff55e88d9 in BaseUI::main_thread (this=0x2c17f18) at ../libs/pbd/base_ui.cc:86
#26 0x00007ffff55ec63f in sigc::bound_mem_functor0<void, BaseUI>::operator() (this=0xea81498)
    at /home/ardour/linux-x86_64/gtk/inst/include/sigc++-2.0/sigc++/functors/mem_fun.h:1787
#27 0x00007ffff55ec36c in sigc::adaptor_functor<sigc::bound_mem_functor0<void, BaseUI> >::operator() (this=0xea81490)
    at /home/ardour/linux-x86_64/gtk/inst/include/sigc++-2.0/sigc++/adaptors/adaptor_trait.h:251
#28 0x00007ffff55ebd23 in sigc::internal::slot_call0<sigc::bound_mem_functor0<void, BaseUI>, void>::call_it (rep=0xea81460)
    at /home/ardour/linux-x86_64/gtk/inst/include/sigc++-2.0/sigc++/functors/slot.h:103
#29 0x00007ffff49fdb72 in ?? () from /opt/Ardour-4.2.179-dbg/lib/libglibmm-2.4.so.1
#30 0x00007ffff449e7f5 in ?? () from /opt/Ardour-4.2.179-dbg/lib/libglib-2.0.so.0
#31 0x00007ffff0285e9a in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0
#32 0x00007fffed32138d in clone () from /lib/x86_64-linux-gnu/libc.so.6
#33 0x0000000000000000 in ?? ()

Thread 30 (Thread 0x7fffc8a1b700 (LWP 7524)):
#0  0x00007fffed2ed0ad in nanosleep () from /lib/x86_64-linux-gnu/libc.so.6
#1  0x00007fffed31ae44 in usleep () from /lib/x86_64-linux-gnu/libc.so.6
#2  0x00007fffa50614b0 in AFX_engine::run_engine() () from /usr/lib/lv2/sr2b.lv2/sr2b-lv2.so
#3  0x00007fffa5053eb4 in start_ui_thread(void*) () from /usr/lib/lv2/sr2b.lv2/sr2b-lv2.so
---Type <return> to continue, or q <return> to quit---
#4  0x00007ffff0285e9a in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0
#5  0x00007fffed32138d in clone () from /lib/x86_64-linux-gnu/libc.so.6
#6  0x0000000000000000 in ?? ()

Thread 29 (Thread 0x7fffc239c700 (LWP 7523)):
#0  0x00007fffed2ed0ad in nanosleep () from /lib/x86_64-linux-gnu/libc.so.6
#1  0x00007fffed31ae44 in usleep () from /lib/x86_64-linux-gnu/libc.so.6
#2  0x00007fffc01888c1 in AFX_engine::run_engine() () from /usr/lib/lv2/black-eq2.lv2/black-eq2-dsp.so
#3  0x00007fffc0178bd3 in start_ui_thread(void*) () from /usr/lib/lv2/black-eq2.lv2/black-eq2-dsp.so
#4  0x00007ffff0285e9a in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0
#5  0x00007fffed32138d in clone () from /lib/x86_64-linux-gnu/libc.so.6
#6  0x0000000000000000 in ?? ()

Thread 28 (Thread 0x7fffc9a1d700 (LWP 7522)):
#0  0x00007fffed3159d3 in poll () from /lib/x86_64-linux-gnu/libc.so.6
#1  0x00007ffff4473aa5 in ?? () from /opt/Ardour-4.2.179-dbg/lib/libglib-2.0.so.0
#2  0x00007ffff4473bb5 in g_main_loop_run () from /opt/Ardour-4.2.179-dbg/lib/libglib-2.0.so.0
#3  0x00007ffff55e88d9 in BaseUI::main_thread (this=0x66e15c0) at ../libs/pbd/base_ui.cc:86
#4  0x00007ffff55ec63f in sigc::bound_mem_functor0<void, BaseUI>::operator() (this=0x66e1d88)
    at /home/ardour/linux-x86_64/gtk/inst/include/sigc++-2.0/sigc++/functors/mem_fun.h:1787
#5  0x00007ffff55ec36c in sigc::adaptor_functor<sigc::bound_mem_functor0<void, BaseUI> >::operator() (this=0x66e1d80)
    at /home/ardour/linux-x86_64/gtk/inst/include/sigc++-2.0/sigc++/adaptors/adaptor_trait.h:251
#6  0x00007ffff55ebd23 in sigc::internal::slot_call0<sigc::bound_mem_functor0<void, BaseUI>, void>::call_it (rep=0x66e1d50)
    at /home/ardour/linux-x86_64/gtk/inst/include/sigc++-2.0/sigc++/functors/slot.h:103
#7  0x00007ffff49fdb72 in ?? () from /opt/Ardour-4.2.179-dbg/lib/libglibmm-2.4.so.1
#8  0x00007ffff449e7f5 in ?? () from /opt/Ardour-4.2.179-dbg/lib/libglib-2.0.so.0
#9  0x00007ffff0285e9a in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0
#10 0x00007fffed32138d in clone () from /lib/x86_64-linux-gnu/libc.so.6
#11 0x0000000000000000 in ?? ()

Thread 27 (Thread 0x7fffc0528800 (LWP 7521)):
#0  0x00007fffed3159d3 in poll () from /lib/x86_64-linux-gnu/libc.so.6
#1  0x00007ffff55ff3e5 in CrossThreadChannel::poll_for_request (this=0x1f34f90) at ../libs/pbd/crossthread.posix.cc:73
#2  0x00007ffff55ff44d in CrossThreadChannel::receive (this=0x1f34f90, msg=@0x7fffc05276cf: 0 '\000', wait=true) at ../libs/pbd/crossthread.posix.cc:94
#3  0x00007ffff68a9b83 in ARDOUR::Butler::thread_work (this=0x1f34f00) at ../libs/ardour/butler.cc:175
#4  0x00007ffff68a9829 in ARDOUR::Butler::_thread_work (arg=0x1f34f00) at ../libs/ardour/butler.cc:156
#5  0x00007ffff5617c9a in fake_thread_start (arg=0x66e1420) at ../libs/pbd/pthread_utils.cc:93
#6  0x00007ffff0285e9a in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0
---Type <return> to continue, or q <return> to quit---
#7  0x00007fffed32138d in clone () from /lib/x86_64-linux-gnu/libc.so.6
#8  0x0000000000000000 in ?? ()

Thread 26 (Thread 0x7fffc05aa700 (LWP 7520)):
#0  ARDOUR::ProcessThread::get_route_buffers (count=..., silence=true) at ../libs/ardour/process_thread.cc:137
#1  0x00007ffff6be8a43 in ARDOUR::Session::get_route_buffers (this=0x1f32fd0, count=..., silence=true) at ../libs/ardour/session.cc:5528
#2  0x00007ffff6b76e4d in ARDOUR::Route::passthru_silence (this=0xca766d0, start_frame=4140230, end_frame=4140486, nframes=256, declick=0)
    at ../libs/ardour/route.cc:759
#3  0x00007ffff6d02b03 in ARDOUR::Track::no_roll (this=0xca766d0, nframes=256, start_frame=4140230, end_frame=4140486, session_state_changing=false)
    at ../libs/ardour/track.cc:526
#4  0x00007ffff699f1fe in ARDOUR::Graph::process_one_route (this=0x2aaabc0, route=0xca766d0) at ../libs/ardour/graph.cc:583
#5  0x00007ffff69a4595 in ARDOUR::GraphNode::process (this=0xca76970) at ../libs/ardour/graphnode.cc:79
#6  0x00007ffff699d553 in ARDOUR::Graph::run_one (this=0x2aaabc0) at ../libs/ardour/graph.cc:400
#7  0x00007ffff699d716 in ARDOUR::Graph::helper_thread (this=0x2aaabc0) at ../libs/ardour/graph.cc:418
#8  0x00007ffff69a38c3 in boost::_mfi::mf0<void, ARDOUR::Graph>::operator() (this=0x7fffc05a9ce8, p=0x2aaabc0)
    at /home/ardour/linux-x86_64/gtk/inst/include/boost/bind/mem_fn_template.hpp:49
#9  0x00007ffff69a30d8 in boost::_bi::list1<boost::_bi::value<ARDOUR::Graph*> >::operator()<boost::_mfi::mf0<void, ARDOUR::Graph>, boost::_bi::list0> (
    this=0x7fffc05a9cf8, f=..., a=...) at /home/ardour/linux-x86_64/gtk/inst/include/boost/bind/bind.hpp:253
#10 0x00007ffff69a26f7 in boost::_bi::bind_t<void, boost::_mfi::mf0<void, ARDOUR::Graph>, boost::_bi::list1<boost::_bi::value<ARDOUR::Graph*> > >::operator() (this=0x7fffc05a9ce8) at /home/ardour/linux-x86_64/gtk/inst/include/boost/bind/bind_template.hpp:20
#11 0x00007ffff69a20ed in boost::detail::function::void_function_obj_invoker0<boost::_bi::bind_t<void, boost::_mfi::mf0<void, ARDOUR::Graph>, boost::_bi::list1<boost::_bi::value<ARDOUR::Graph*> > >, void>::invoke (function_obj_ptr=...)
    at /home/ardour/linux-x86_64/gtk/inst/include/boost/function/function_template.hpp:153
#12 0x00000000005e3813 in boost::function0<void>::operator() (this=0x7fffc05a9ce0)
    at /home/ardour/linux-x86_64/gtk/inst/include/boost/function/function_template.hpp:760
#13 0x00007fffe1767ba9 in ARDOUR::JACKAudioBackend::_start_process_thread (arg=0x2abadd0) at ../libs/backends/jack/jack_audiobackend.cc:903
#14 0x00007ffff0285e9a in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0
#15 0x00007fffed32138d in clone () from /lib/x86_64-linux-gnu/libc.so.6
#16 0x0000000000000000 in ?? ()

Thread 25 (Thread 0x7fffc062b700 (LWP 7519)):
#0  ARDOUR::DataType::DataType (this=0x7fffc062a4a0, symbol=@0x7fffc062a4ac: ARDOUR::DataType::AUDIO)
    at /home/ardour/linux-x86_64/ardour/libs/ardour/ardour/data_type.h:61
#1  0x00000000005c523e in ARDOUR::DataType::iterator::operator* (this=0x7fffc062a4d0)
    at /home/ardour/linux-x86_64/ardour/libs/ardour/ardour/data_type.h:97
#2  0x0000000000c19a81 in ARDOUR::ChanCount::operator< (this=0x7fffc062a790, other=...)
    at /home/ardour/linux-x86_64/ardour/libs/ardour/ardour/chan_count.h:91
#3  0x0000000000c19b45 in ARDOUR::ChanCount::operator<= (this=0x7fffc062a790, other=...)
---Type <return> to continue, or q <return> to quit---
    at /home/ardour/linux-x86_64/ardour/libs/ardour/ardour/chan_count.h:99
#4  0x0000000000c19cd7 in ARDOUR::BufferSet::set_count (this=0x1ab90c0, count=...) at /home/ardour/linux-x86_64/ardour/libs/ardour/ardour/buffer_set.h:93
#5  0x00007ffff6b75ed8 in ARDOUR::Route::process_output_buffers (this=0xd159eb0, bufs=..., start_frame=4140230, end_frame=4140486, nframes=256, 
    declick=0, gain_automation_ok=false) at ../libs/ardour/route.cc:609
#6  0x00007ffff6b76ee8 in ARDOUR::Route::passthru_silence (this=0xd159eb0, start_frame=4140230, end_frame=4140486, nframes=256, declick=0)
    at ../libs/ardour/route.cc:763
#7  0x00007ffff6d02b03 in ARDOUR::Track::no_roll (this=0xd159eb0, nframes=256, start_frame=4140230, end_frame=4140486, session_state_changing=false)
    at ../libs/ardour/track.cc:526
#8  0x00007ffff699f1fe in ARDOUR::Graph::process_one_route (this=0x2aaabc0, route=0xd159eb0) at ../libs/ardour/graph.cc:583
#9  0x00007ffff69a4595 in ARDOUR::GraphNode::process (this=0xd15a150) at ../libs/ardour/graphnode.cc:79
#10 0x00007ffff699d553 in ARDOUR::Graph::run_one (this=0x2aaabc0) at ../libs/ardour/graph.cc:400
#11 0x00007ffff699d716 in ARDOUR::Graph::helper_thread (this=0x2aaabc0) at ../libs/ardour/graph.cc:418
#12 0x00007ffff69a38c3 in boost::_mfi::mf0<void, ARDOUR::Graph>::operator() (this=0x7fffc062ace8, p=0x2aaabc0)
    at /home/ardour/linux-x86_64/gtk/inst/include/boost/bind/mem_fn_template.hpp:49
#13 0x00007ffff69a30d8 in boost::_bi::list1<boost::_bi::value<ARDOUR::Graph*> >::operator()<boost::_mfi::mf0<void, ARDOUR::Graph>, boost::_bi::list0> (
    this=0x7fffc062acf8, f=..., a=...) at /home/ardour/linux-x86_64/gtk/inst/include/boost/bind/bind.hpp:253
#14 0x00007ffff69a26f7 in boost::_bi::bind_t<void, boost::_mfi::mf0<void, ARDOUR::Graph>, boost::_bi::list1<boost::_bi::value<ARDOUR::Graph*> > >::operator() (this=0x7fffc062ace8) at /home/ardour/linux-x86_64/gtk/inst/include/boost/bind/bind_template.hpp:20
#15 0x00007ffff69a20ed in boost::detail::function::void_function_obj_invoker0<boost::_bi::bind_t<void, boost::_mfi::mf0<void, ARDOUR::Graph>, boost::_bi::list1<boost::_bi::value<ARDOUR::Graph*> > >, void>::invoke (function_obj_ptr=...)
    at /home/ardour/linux-x86_64/gtk/inst/include/boost/function/function_template.hpp:153
#16 0x00000000005e3813 in boost::function0<void>::operator() (this=0x7fffc062ace0)
    at /home/ardour/linux-x86_64/gtk/inst/include/boost/function/function_template.hpp:760
#17 0x00007fffe1767ba9 in ARDOUR::JACKAudioBackend::_start_process_thread (arg=0x2abadd0) at ../libs/backends/jack/jack_audiobackend.cc:903
#18 0x00007ffff0285e9a in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0
#19 0x00007fffed32138d in clone () from /lib/x86_64-linux-gnu/libc.so.6
#20 0x0000000000000000 in ?? ()

Thread 24 (Thread 0x7fffc06ac700 (LWP 7518)):
#0  0x0000000000699ee9 in ARDOUR::Session::tempo_map (this=0x33f7) at /home/ardour/linux-x86_64/ardour/libs/ardour/ardour/session.h:633
#1  0x00007ffff6d20219 in ARDOUR::LV2Plugin::connect_and_run (this=0xe958f10, bufs=..., in_map=..., out_map=..., nframes=256, offset=0)
    at ../libs/ardour/lv2_plugin.cc:1934
#2  0x00007ffff6ae91c0 in ARDOUR::PluginInsert::connect_and_run (this=0xe956290, bufs=..., nframes=256, offset=0, with_auto=false, now=0)
    at ../libs/ardour/plugin_insert.cc:406
#3  0x00007ffff6ae99a5 in ARDOUR::PluginInsert::run (this=0xe956290, bufs=..., start_frame=4140230, nframes=256) at ../libs/ardour/plugin_insert.cc:470
#4  0x00007ffff6b75e95 in ARDOUR::Route::process_output_buffers (this=0xe8586f0, bufs=..., start_frame=4140230, end_frame=4140486, nframes=256, 
    declick=0, gain_automation_ok=true) at ../libs/ardour/route.cc:608
#5  0x00007ffff6b76e02 in ARDOUR::Route::passthru (this=0xe8586f0, bufs=..., start_frame=4140230, end_frame=4140486, nframes=256, declick=0)
---Type <return> to continue, or q <return> to quit---
    at ../libs/ardour/route.cc:753
#6  0x00007ffff6b87afc in ARDOUR::Route::no_roll (this=0xe8586f0, nframes=256, start_frame=4140230, end_frame=4140486, session_state_changing=false)
    at ../libs/ardour/route.cc:3374
#7  0x00007ffff699f1fe in ARDOUR::Graph::process_one_route (this=0x2aaabc0, route=0xe8586f0) at ../libs/ardour/graph.cc:583
#8  0x00007ffff69a4595 in ARDOUR::GraphNode::process (this=0xe858990) at ../libs/ardour/graphnode.cc:79
#9  0x00007ffff699d553 in ARDOUR::Graph::run_one (this=0x2aaabc0) at ../libs/ardour/graph.cc:400
#10 0x00007ffff699dad7 in ARDOUR::Graph::main_thread (this=0x2aaabc0) at ../libs/ardour/graph.cc:456
#11 0x00007ffff69a38c3 in boost::_mfi::mf0<void, ARDOUR::Graph>::operator() (this=0x7fffc06abce8, p=0x2aaabc0)
    at /home/ardour/linux-x86_64/gtk/inst/include/boost/bind/mem_fn_template.hpp:49
#12 0x00007ffff69a30d8 in boost::_bi::list1<boost::_bi::value<ARDOUR::Graph*> >::operator()<boost::_mfi::mf0<void, ARDOUR::Graph>, boost::_bi::list0> (
    this=0x7fffc06abcf8, f=..., a=...) at /home/ardour/linux-x86_64/gtk/inst/include/boost/bind/bind.hpp:253
#13 0x00007ffff69a26f7 in boost::_bi::bind_t<void, boost::_mfi::mf0<void, ARDOUR::Graph>, boost::_bi::list1<boost::_bi::value<ARDOUR::Graph*> > >::operator() (this=0x7fffc06abce8) at /home/ardour/linux-x86_64/gtk/inst/include/boost/bind/bind_template.hpp:20
#14 0x00007ffff69a20ed in boost::detail::function::void_function_obj_invoker0<boost::_bi::bind_t<void, boost::_mfi::mf0<void, ARDOUR::Graph>, boost::_bi::list1<boost::_bi::value<ARDOUR::Graph*> > >, void>::invoke (function_obj_ptr=...)
    at /home/ardour/linux-x86_64/gtk/inst/include/boost/function/function_template.hpp:153
#15 0x00000000005e3813 in boost::function0<void>::operator() (this=0x7fffc06abce0)
    at /home/ardour/linux-x86_64/gtk/inst/include/boost/function/function_template.hpp:760
#16 0x00007fffe1767ba9 in ARDOUR::JACKAudioBackend::_start_process_thread (arg=0x2abadd0) at ../libs/backends/jack/jack_audiobackend.cc:903
#17 0x00007ffff0285e9a in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0
#18 0x00007fffed32138d in clone () from /lib/x86_64-linux-gnu/libc.so.6
#19 0x0000000000000000 in ?? ()

Thread 22 (Thread 0x7fffc1995700 (LWP 7515)):
#0  0x00007ffff028bfd0 in sem_wait () from /lib/x86_64-linux-gnu/libpthread.so.0
#1  0x00007ffff699f3e4 in PBD::ProcessSemaphore::wait (this=0x2aaacb0) at /home/ardour/linux-x86_64/ardour/libs/pbd/pbd/semutils.h:56
#2  0x00007ffff699ef7a in ARDOUR::Graph::routes_no_roll (this=0x2aaabc0, nframes=256, start_frame=4140230, end_frame=4140486, non_rt_pending=false, 
    declick=0) at ../libs/ardour/graph.cc:565
#3  0x00007ffff6c63329 in ARDOUR::Session::no_roll (this=0x1f32fd0, nframes=256) at ../libs/ardour/session_process.cc:147
#4  0x00007ffff6c630bc in ARDOUR::Session::fail_roll (this=0x1f32fd0, nframes=256) at ../libs/ardour/session_process.cc:126
#5  0x00007ffff6c66bc3 in ARDOUR::Session::process_without_events (this=0x1f32fd0, nframes=256) at ../libs/ardour/session_process.cc:830
#6  0x00007ffff6c641ac in ARDOUR::Session::process_with_events (this=0x1f32fd0, nframes=256) at ../libs/ardour/session_process.cc:361
#7  0x00007ffff6c62e01 in ARDOUR::Session::process (this=0x1f32fd0, nframes=256) at ../libs/ardour/session_process.cc:76
#8  0x00007ffff6839527 in ARDOUR::AudioEngine::process_callback (this=0x1ac4640, nframes=256) at ../libs/ardour/audioengine.cc:351
#9  0x00007fffe1767c76 in ARDOUR::JACKAudioBackend::process_thread (this=0x1cee200) at ../libs/backends/jack/jack_audiobackend.cc:934
#10 0x00007fffe1767bfe in ARDOUR::JACKAudioBackend::_process_thread (arg=0x1cee200) at ../libs/backends/jack/jack_audiobackend.cc:911
#11 0x00007fffe0fec7d7 in ?? () from /usr/lib/x86_64-linux-gnu/libjack.so.0
#12 0x00007fffe10080b0 in ?? () from /usr/lib/x86_64-linux-gnu/libjack.so.0
---Type <return> to continue, or q <return> to quit---
#13 0x00007ffff0285e9a in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0
#14 0x00007fffed32138d in clone () from /lib/x86_64-linux-gnu/libc.so.6
#15 0x0000000000000000 in ?? ()

Thread 21 (Thread 0x7fffe0120700 (LWP 7514)):
#0  0x00007ffff028cd2d in read () from /lib/x86_64-linux-gnu/libpthread.so.0
#1  0x00007fffe1009f7b in ?? () from /usr/lib/x86_64-linux-gnu/libjack.so.0
#2  0x00007fffe100cd9a in ?? () from /usr/lib/x86_64-linux-gnu/libjack.so.0
#3  0x00007fffe10080b0 in ?? () from /usr/lib/x86_64-linux-gnu/libjack.so.0
#4  0x00007ffff0285e9a in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0
#5  0x00007fffed32138d in clone () from /lib/x86_64-linux-gnu/libc.so.6
#6  0x0000000000000000 in ?? ()

Thread 20 (Thread 0x7fffe01a1700 (LWP 7513)):
#0  0x00007ffff0289d84 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/x86_64-linux-gnu/libpthread.so.0
#1  0x00007fffe10096a4 in ?? () from /usr/lib/x86_64-linux-gnu/libjack.so.0
#2  0x00007fffe1000195 in ?? () from /usr/lib/x86_64-linux-gnu/libjack.so.0
#3  0x00007fffe10080b0 in ?? () from /usr/lib/x86_64-linux-gnu/libjack.so.0
#4  0x00007ffff0285e9a in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0
#5  0x00007fffed32138d in clone () from /lib/x86_64-linux-gnu/libc.so.6
#6  0x0000000000000000 in ?? ()

Thread 13 (Thread 0x7fffcaf1e700 (LWP 7506)):
#0  0x00007fffed3159d3 in poll () from /lib/x86_64-linux-gnu/libc.so.6
#1  0x00007ffff4473aa5 in ?? () from /opt/Ardour-4.2.179-dbg/lib/libglib-2.0.so.0
#2  0x00007ffff4473cc7 in g_main_context_iteration () from /opt/Ardour-4.2.179-dbg/lib/libglib-2.0.so.0
#3  0x00007ffff4473d19 in ?? () from /opt/Ardour-4.2.179-dbg/lib/libglib-2.0.so.0
#4  0x00007ffff449e7f5 in ?? () from /opt/Ardour-4.2.179-dbg/lib/libglib-2.0.so.0
#5  0x00007ffff0285e9a in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0
#6  0x00007fffed32138d in clone () from /lib/x86_64-linux-gnu/libc.so.6
#7  0x0000000000000000 in ?? ()

Thread 7 (Thread 0x7fffe21a0700 (LWP 7500)):
#0  0x00007ffff0289d84 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/x86_64-linux-gnu/libpthread.so.0
#1  0x00007ffff44bf524 in g_cond_wait () from /opt/Ardour-4.2.179-dbg/lib/libglib-2.0.so.0
#2  0x00007ffff6839df1 in ARDOUR::AudioEngine::do_devicelist_update (this=0x1ac4640) at ../libs/ardour/audioengine.cc:536
#3  0x00007ffff6847347 in boost::_mfi::mf0<void, ARDOUR::AudioEngine>::operator() (this=0x1ac5120, p=0x1ac4640)
    at /home/ardour/linux-x86_64/gtk/inst/include/boost/bind/mem_fn_template.hpp:49
---Type <return> to continue, or q <return> to quit---
#4  0x00007ffff6846f56 in boost::_bi::list1<boost::_bi::value<ARDOUR::AudioEngine*> >::operator()<boost::_mfi::mf0<void, ARDOUR::AudioEngine>, boost::_bi::list0> (this=0x1ac5130, f=..., a=...) at /home/ardour/linux-x86_64/gtk/inst/include/boost/bind/bind.hpp:253
#5  0x00007ffff6846857 in boost::_bi::bind_t<void, boost::_mfi::mf0<void, ARDOUR::AudioEngine>, boost::_bi::list1<boost::_bi::value<ARDOUR::AudioEngine*> > >::operator() (this=0x1ac5120) at /home/ardour/linux-x86_64/gtk/inst/include/boost/bind/bind_template.hpp:20
#6  0x00007ffff6846044 in sigc::adaptor_functor<boost::_bi::bind_t<void, boost::_mfi::mf0<void, ARDOUR::AudioEngine>, boost::_bi::list1<boost::_bi::value<ARDOUR::AudioEngine*> > > >::operator() (this=0x1ac5120) at /home/ardour/linux-x86_64/gtk/inst/include/sigc++-2.0/sigc++/adaptors/adaptor_trait.h:251
#7  0x00007ffff684526c in sigc::internal::slot_call0<boost::_bi::bind_t<void, boost::_mfi::mf0<void, ARDOUR::AudioEngine>, boost::_bi::list1<boost::_bi::value<ARDOUR::AudioEngine*> > >, void>::call_it (rep=0x1ac50f0) at /home/ardour/linux-x86_64/gtk/inst/include/sigc++-2.0/sigc++/functors/slot.h:103
#8  0x00007ffff49fdb72 in ?? () from /opt/Ardour-4.2.179-dbg/lib/libglibmm-2.4.so.1
#9  0x00007ffff449e7f5 in ?? () from /opt/Ardour-4.2.179-dbg/lib/libglib-2.0.so.0
#10 0x00007ffff0285e9a in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0
#11 0x00007fffed32138d in clone () from /lib/x86_64-linux-gnu/libc.so.6
#12 0x0000000000000000 in ?? ()

Thread 6 (Thread 0x7fffe29a1700 (LWP 7499)):
#0  0x00007ffff0289d84 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/x86_64-linux-gnu/libpthread.so.0
#1  0x00007ffff44bf524 in g_cond_wait () from /opt/Ardour-4.2.179-dbg/lib/libglib-2.0.so.0
#2  0x00007ffff6839bab in ARDOUR::AudioEngine::do_reset_backend (this=0x1ac4640) at ../libs/ardour/audioengine.cc:501
#3  0x00007ffff6847347 in boost::_mfi::mf0<void, ARDOUR::AudioEngine>::operator() (this=0x1ac4f40, p=0x1ac4640)
    at /home/ardour/linux-x86_64/gtk/inst/include/boost/bind/mem_fn_template.hpp:49
#4  0x00007ffff6846f56 in boost::_bi::list1<boost::_bi::value<ARDOUR::AudioEngine*> >::operator()<boost::_mfi::mf0<void, ARDOUR::AudioEngine>, boost::_bi::list0> (this=0x1ac4f50, f=..., a=...) at /home/ardour/linux-x86_64/gtk/inst/include/boost/bind/bind.hpp:253
#5  0x00007ffff6846857 in boost::_bi::bind_t<void, boost::_mfi::mf0<void, ARDOUR::AudioEngine>, boost::_bi::list1<boost::_bi::value<ARDOUR::AudioEngine*> > >::operator() (this=0x1ac4f40) at /home/ardour/linux-x86_64/gtk/inst/include/boost/bind/bind_template.hpp:20
#6  0x00007ffff6846044 in sigc::adaptor_functor<boost::_bi::bind_t<void, boost::_mfi::mf0<void, ARDOUR::AudioEngine>, boost::_bi::list1<boost::_bi::value<ARDOUR::AudioEngine*> > > >::operator() (this=0x1ac4f40) at /home/ardour/linux-x86_64/gtk/inst/include/sigc++-2.0/sigc++/adaptors/adaptor_trait.h:251
#7  0x00007ffff684526c in sigc::internal::slot_call0<boost::_bi::bind_t<void, boost::_mfi::mf0<void, ARDOUR::AudioEngine>, boost::_bi::list1<boost::_bi::value<ARDOUR::AudioEngine*> > >, void>::call_it (rep=0x1ac4f10) at /home/ardour/linux-x86_64/gtk/inst/include/sigc++-2.0/sigc++/functors/slot.h:103
#8  0x00007ffff49fdb72 in ?? () from /opt/Ardour-4.2.179-dbg/lib/libglibmm-2.4.so.1
#9  0x00007ffff449e7f5 in ?? () from /opt/Ardour-4.2.179-dbg/lib/libglib-2.0.so.0
#10 0x00007ffff0285e9a in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0
#11 0x00007fffed32138d in clone () from /lib/x86_64-linux-gnu/libc.so.6
#12 0x0000000000000000 in ?? ()

Thread 5 (Thread 0x7fffe37fe700 (LWP 7498)):
#0  0x00007ffff0289d84 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/x86_64-linux-gnu/libpthread.so.0
#1  0x00007ffff44bf524 in g_cond_wait () from /opt/Ardour-4.2.179-dbg/lib/libglib-2.0.so.0
#2  0x00007ffff67e1b8f in ARDOUR::Analyser::work () at ../libs/ardour/analyser.cc:85
---Type <return> to continue, or q <return> to quit---
#3  0x00007ffff67e1925 in analyser_work () at ../libs/ardour/analyser.cc:50
#4  0x0000000000caa9f5 in sigc::pointer_functor0<void>::operator() (this=0x18b4948)
    at /home/ardour/linux-x86_64/gtk/inst/include/sigc++-2.0/sigc++/functors/ptr_fun.h:77
#5  0x0000000000ca803e in sigc::adaptor_functor<sigc::pointer_functor0<void> >::operator() (this=0x18b4940)
    at /home/ardour/linux-x86_64/gtk/inst/include/sigc++-2.0/sigc++/adaptors/adaptor_trait.h:251
#6  0x0000000000ca4853 in sigc::internal::slot_call0<sigc::pointer_functor0<void>, void>::call_it (rep=0x18b4910)
    at /home/ardour/linux-x86_64/gtk/inst/include/sigc++-2.0/sigc++/functors/slot.h:103
#7  0x00007ffff49fdb72 in ?? () from /opt/Ardour-4.2.179-dbg/lib/libglibmm-2.4.so.1
#8  0x00007ffff449e7f5 in ?? () from /opt/Ardour-4.2.179-dbg/lib/libglib-2.0.so.0
#9  0x00007ffff0285e9a in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0
#10 0x00007fffed32138d in clone () from /lib/x86_64-linux-gnu/libc.so.6
#11 0x0000000000000000 in ?? ()

Thread 4 (Thread 0x7fffe3fff700 (LWP 7497)):
#0  0x00007ffff0289d84 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/x86_64-linux-gnu/libpthread.so.0
#1  0x00007ffff44bf524 in g_cond_wait () from /opt/Ardour-4.2.179-dbg/lib/libglib-2.0.so.0
#2  0x00007ffff6cd6c1d in peak_thread_work () at ../libs/ardour/source_factory.cc:68
#3  0x0000000000caa9f5 in sigc::pointer_functor0<void>::operator() (this=0x18b5088)
    at /home/ardour/linux-x86_64/gtk/inst/include/sigc++-2.0/sigc++/functors/ptr_fun.h:77
#4  0x0000000000ca803e in sigc::adaptor_functor<sigc::pointer_functor0<void> >::operator() (this=0x18b5080)
    at /home/ardour/linux-x86_64/gtk/inst/include/sigc++-2.0/sigc++/adaptors/adaptor_trait.h:251
#5  0x0000000000ca4853 in sigc::internal::slot_call0<sigc::pointer_functor0<void>, void>::call_it (rep=0x18b5050)
    at /home/ardour/linux-x86_64/gtk/inst/include/sigc++-2.0/sigc++/functors/slot.h:103
#6  0x00007ffff49fdb72 in ?? () from /opt/Ardour-4.2.179-dbg/lib/libglibmm-2.4.so.1
#7  0x00007ffff449e7f5 in ?? () from /opt/Ardour-4.2.179-dbg/lib/libglib-2.0.so.0
#8  0x00007ffff0285e9a in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0
#9  0x00007fffed32138d in clone () from /lib/x86_64-linux-gnu/libc.so.6
#10 0x0000000000000000 in ?? ()

Thread 3 (Thread 0x7fffe8b68700 (LWP 7496)):
#0  0x00007ffff0289d84 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/x86_64-linux-gnu/libpthread.so.0
#1  0x00007ffff44bf524 in g_cond_wait () from /opt/Ardour-4.2.179-dbg/lib/libglib-2.0.so.0
#2  0x00007ffff6cd6c1d in peak_thread_work () at ../libs/ardour/source_factory.cc:68
#3  0x0000000000caa9f5 in sigc::pointer_functor0<void>::operator() (this=0x18b6f48)
    at /home/ardour/linux-x86_64/gtk/inst/include/sigc++-2.0/sigc++/functors/ptr_fun.h:77
#4  0x0000000000ca803e in sigc::adaptor_functor<sigc::pointer_functor0<void> >::operator() (this=0x18b6f40)
    at /home/ardour/linux-x86_64/gtk/inst/include/sigc++-2.0/sigc++/adaptors/adaptor_trait.h:251
#5  0x0000000000ca4853 in sigc::internal::slot_call0<sigc::pointer_functor0<void>, void>::call_it (rep=0x18b6f10)
---Type <return> to continue, or q <return> to quit---
    at /home/ardour/linux-x86_64/gtk/inst/include/sigc++-2.0/sigc++/functors/slot.h:103
#6  0x00007ffff49fdb72 in ?? () from /opt/Ardour-4.2.179-dbg/lib/libglibmm-2.4.so.1
#7  0x00007ffff449e7f5 in ?? () from /opt/Ardour-4.2.179-dbg/lib/libglib-2.0.so.0
#8  0x00007ffff0285e9a in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0
#9  0x00007fffed32138d in clone () from /lib/x86_64-linux-gnu/libc.so.6
#10 0x0000000000000000 in ?? ()

Thread 2 (Thread 0x7fffe9369700 (LWP 7495)):
#0  0x00007ffff028d52d in nanosleep () from /lib/x86_64-linux-gnu/libpthread.so.0
#1  0x00007ffff44a0298 in g_usleep () from /opt/Ardour-4.2.179-dbg/lib/libglib-2.0.so.0
#2  0x0000000000fc39ac in gui_event_loop (ptr=0x0) at ../gtk2_ardour/linux_vst_gui_support.cc:476
#3  0x00007ffff0285e9a in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0
#4  0x00007fffed32138d in clone () from /lib/x86_64-linux-gnu/libc.so.6
#5  0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7ffff7fab8c0 (LWP 7492)):
#0  0x00007fffed3159d3 in poll () from /lib/x86_64-linux-gnu/libc.so.6
#1  0x00007ffff4473aa5 in ?? () from /opt/Ardour-4.2.179-dbg/lib/libglib-2.0.so.0
#2  0x00007ffff4473bb5 in g_main_loop_run () from /opt/Ardour-4.2.179-dbg/lib/libglib-2.0.so.0
#3  0x00007ffff38da657 in gtk_main () from /opt/Ardour-4.2.179-dbg/lib/libgtk-x11-2.0.so.0
#4  0x00007ffff75a4425 in Gtkmm2ext::UI::run (this=0x1ae2c80, old_receiver=...) at ../libs/gtkmm2ext/gtk_ui.cc:280
#5  0x0000000000a6e42e in main (argc=1, argv=0x7fffffffd508) at ../gtk2_ardour/main.cc:390