Thread 9 (process 6905 thread 0x3407):
#0  0x900bc8bc in poll ()
#1  0x102d7f34 in ARDOUR::Session::midi_thread_work (this=0x1b08ba00) at libs/ardour/session_midi.cc:1206
#2  0x102d8489 in ARDOUR::Session::_midi_thread_work (arg=0x1b08ba00) at libs/ardour/session_midi.cc:1127
#3  0x90023d87 in _pthread_body ()

Thread 8 (process 6905 thread 0x3507):
#0  0x900bc8bc in poll ()
#1  0x102cba23 in ARDOUR::Session::butler_thread_work (this=0x1b08ba00) at libs/ardour/session_butler.cc:177
#2  0x102cc764 in ARDOUR::Session::_butler_thread_work (arg=0x1b08ba00) at libs/ardour/session_butler.cc:156
#3  0x90023d87 in _pthread_body ()

Thread 7 (process 6905 thread 0x3703):
#0  0x90009857 in mach_msg_trap ()
#1  0x900097b8 in mach_msg ()
#2  0x1ac822b0 in jack_client_process_thread (arg=0x1b016800) at ../config/os/macosx/ipc.h:108
#3  0x90023d87 in _pthread_body ()

Thread 6 (process 6905 thread 0x3603):
#0  0x90019d3c in select ()
#1  0x1ac819f0 in jack_client_thread (arg=0x1b016800) at ../config/os/macosx/poll.h:118
#2  0x90023d87 in _pthread_body ()

Thread 5 (process 6905 thread 0x3103):
#0  0x900bc8bc in poll ()
#1  0x1023a680 in ARDOUR::AudioSource::peak_thread_work (arg=0x0) at libs/ardour/audiosource.cc:137
#2  0x90023d87 in _pthread_body ()

Thread 4 (process 6905 thread 0x3013):
#0  0x900bc8bc in poll ()
#1  0x1030289f in ARDOUR::OSC::osc_receiver (this=0x1b9ee3b0) at libs/ardour/osc.cc:309
#2  0x10302a6f in ARDOUR::OSC::_osc_receiver (arg=0x1b9ee3b0) at libs/ardour/osc.cc:269
#3  0x90023d87 in _pthread_body ()

Thread 3 (process 6905 thread 0x2c03):
#0  0x90009857 in mach_msg_trap ()
#1  0x900097b8 in mach_msg ()
#2  0x96625adf in XServerMachPort::ReceiveMessage ()
#3  0x9661e03b in MIDIInPortThread::Run ()
#4  0x9661ed1b in XThread::RunHelper ()
#5  0x96626617 in CAPThread::Entry ()
#6  0x90023d87 in _pthread_body ()

Thread 2 (process 6905 thread 0x1603):
#0  0x90037697 in mach_wait_until ()
#1  0x900374de in nanosleep ()
#2  0x0f685931 in g_usleep ()
#3  0x19d389b5 in Glib::usleep (microseconds=10000) at libs/glibmm2/glibmm/timer.cc:68
#4  0x102215c4 in ARDOUR::AudioEngine::meter_thread (this=0x1b9e5180) at libs/ardour/audioengine.cc:387
#5  0x103258c6 in sigc::bound_mem_functor0<void, ARDOUR::AudioEngine>::operator() (this=0x1b9e531c) at libs/sigc++2/sigc++/functors/mem_fun.h:1781
#6  0x103258dc in sigc::adaptor_functor<sigc::bound_mem_functor0<void, ARDOUR::AudioEngine> >::operator() (this=0x1b9e5318) at libs/sigc++2/sigc++/adaptors/adaptor_trait.h:251
#7  0x103258fa in sigc::internal::slot_call0<sigc::bound_mem_functor0<void, ARDOUR::AudioEngine>, void>::call_it (rep=0x1b9e5300) at libs/sigc++2/sigc++/functors/slot.h:103
#8  0x0028ea2a in sigc::slot0<void>::operator() (this=0x1b9e52f0) at libs/sigc++2/sigc++/functors/slot.h:440
#9  0x19d373d9 in call_thread_entry_slot (data=0x1b9e52f0) at libs/glibmm2/glibmm/thread.cc:43
#10 0x0f682691 in g_thread_create_proxy ()
#11 0x90023d87 in _pthread_body ()

Thread 1 (process 6905 local thread 0xf03):
#0  0x900bc8bc in poll ()
#1  0x0f6599c7 in g_main_context_iterate ()
#2  0x0f659f81 in g_main_loop_run ()
#3  0x18d70ac0 in gtk_main ()
#4  0x167565fd in Gtk::Main::run_impl (this=0x1b910430) at libs/gtkmm2/gtk/gtkmm/main.cc:503
#5  0x167564e2 in Gtk::Main::run () at libs/gtkmm2/gtk/gtkmm/main.cc:450
#6  0x1591ed53 in Gtkmm2ext::UI::run (this=0x1b010000, old_receiver=@0x57183c) at libs/gtkmm2ext/gtk_ui.cc:214
#7  0x001b2f3d in main (argc=1, argv=0xbffff440) at gtk2_ardour/main.cc:448
#8  0x00002eee in _start ()
#9  0x00002e15 in start ()
(gdb)