(gdb) thread apply all bt

Thread 21 (Thread 0x7fffd6ba3800 (LWP 3887)):
#0  0x00007fffef18814f in poll () from /lib64/libc.so.6
#1  0x00007ffff7a8f2f3 in ARDOUR::Session::midi_thread_work (this=0x1fc4b10)
    at libs/ardour/session_midi.cc:1222
#2  0x00007ffff7a8ee80 in ARDOUR::Session::_midi_thread_work (arg=0x1fc4b10)
    at libs/ardour/session_midi.cc:1138
#3  0x00007fffef458e0e in start_thread () from /lib64/libpthread.so.0
#4  0x00007fffef1902cd in clone () from /lib64/libc.so.6

Thread 20 (Thread 0x7fffd6c1e800 (LWP 3886)):
#0  0x00007fffef18814f in poll () from /lib64/libc.so.6
#1  0x00007ffff7a3479c in ARDOUR::Session::butler_thread_work (this=0x1fc4b10)
    at libs/ardour/session_butler.cc:179
#2  0x00007ffff7a346f1 in ARDOUR::Session::_butler_thread_work (arg=0x1fc4b10)
    at libs/ardour/session_butler.cc:159
#3  0x00007fffef458e0e in start_thread () from /lib64/libpthread.so.0
#4  0x00007fffef1902cd in clone () from /lib64/libc.so.6

Thread 19 (Thread 0x7fffd6e6f800 (LWP 3885)):
#0  0x00007fffef45f00c in __lll_lock_wait () from /lib64/libpthread.so.0
#1  0x00007fffef45af02 in _L_lock_1125 () from /lib64/libpthread.so.0
#2  0x00007fffef45ae80 in pthread_mutex_lock () from /lib64/libpthread.so.0
---Type <return> to continue, or q <return> to quit---
#3  0x00007ffff6662471 in g_mutex_lock () from /usr/lib64/libglib-2.0.so.0
#4  0x00000000009c4be6 in Glib::Mutex::Lock::Lock (this=0x7fffd6e6eb10, mutex=
    ...) at /usr/include/glibmm-2.4/glibmm/thread.h:833
#5  0x00007ffff79cc4a5 in ARDOUR::IO::meter (this=0x23ef110)
    at libs/ardour/io.cc:2536
#6  0x00007ffff79d3746 in sigc::bound_mem_functor0<void, ARDOUR::IO>::operator() (this=0x23eff18) at /usr/include/sigc++-2.0/sigc++/functors/mem_fun.h:1787
#7  0x00007ffff79d2de8 in sigc::adaptor_functor<sigc::bound_mem_functor0<void, ARDOUR::IO> >::operator() (this=0x23eff10)
    at /usr/include/sigc++-2.0/sigc++/adaptors/adaptor_trait.h:251
#8  0x00007ffff79d2021 in sigc::internal::slot_call0<sigc::bound_mem_functor0<void, ARDOUR::IO>, void>::call_it (rep=0x23efee0)
    at /usr/include/sigc++-2.0/sigc++/functors/slot.h:103
#9  0x0000000000928daa in sigc::internal::signal_emit0<void, sigc::nil>::emit (
    impl=0x23aaf70) at /usr/include/sigc++-2.0/sigc++/signal.h:772
#10 0x000000000092dd04 in sigc::signal0<void, sigc::nil>::emit (this=
    0x7ffff7dd9d00 <ARDOUR::IO::Meter>)
    at /usr/include/sigc++-2.0/sigc++/signal.h:2669
#11 0x000000000092b414 in sigc::signal0<void, sigc::nil>::operator() (this=
    0x7ffff7dd9d00 <ARDOUR::IO::Meter>)
    at /usr/include/sigc++-2.0/sigc++/signal.h:2677
#12 0x00007ffff79cc44d in ARDOUR::IO::update_meters ()
    at libs/ardour/io.cc:2530
---Type <return> to continue, or q <return> to quit---
#13 0x00007ffff7922594 in ARDOUR::AudioEngine::meter_thread (this=0x1c294d0)
    at libs/ardour/audioengine.cc:502
#14 0x00007ffff792aa78 in sigc::bound_mem_functor0<void, ARDOUR::AudioEngine>::operator() (this=0x1fb9098)
    at /usr/include/sigc++-2.0/sigc++/functors/mem_fun.h:1787
#15 0x00007ffff792a800 in sigc::adaptor_functor<sigc::bound_mem_functor0<void, ARDOUR::AudioEngine> >::operator() (this=0x1fb9090)
    at /usr/include/sigc++-2.0/sigc++/adaptors/adaptor_trait.h:251
#16 0x00007ffff792a199 in sigc::internal::slot_call0<sigc::bound_mem_functor0<void, ARDOUR::AudioEngine>, void>::call_it (rep=0x1fb9060)
    at /usr/include/sigc++-2.0/sigc++/functors/slot.h:103
#17 0x00007ffff6d6e1cd in ?? () from /usr/lib64/libglibmm-2.4.so.1
#18 0x00007ffff66490e5 in ?? () from /usr/lib64/libglib-2.0.so.0
#19 0x00007fffef458e0e in start_thread () from /lib64/libpthread.so.0
#20 0x00007fffef1902cd in clone () from /lib64/libc.so.6

Thread 18 (Thread 0x7fffd6ef1700 (LWP 3884)):
#0  0x00007fffef45e940 in sem_timedwait () from /lib64/libpthread.so.0
#1  0x00007ffff2331922 in ?? () from /usr/lib64/libjack.so.0
#2  0x00007ffff23201a9 in ?? () from /usr/lib64/libjack.so.0
#3  0x00007ffff231f42f in ?? () from /usr/lib64/libjack.so.0
#4  0x00007ffff231e7c8 in ?? () from /usr/lib64/libjack.so.0
#5  0x00007ffff2330f00 in ?? () from /usr/lib64/libjack.so.0
---Type <return> to continue, or q <return> to quit---
#6  0x00007fffef458e0e in start_thread () from /lib64/libpthread.so.0
#7  0x00007fffef1902cd in clone () from /lib64/libc.so.6

Thread 17 (Thread 0x7fffd721f700 (LWP 3883)):
#0  0x00007fffef45f2ed in read () from /lib64/libpthread.so.0
#1  0x00007ffff2332ce2 in ?? () from /usr/lib64/libjack.so.0
#2  0x00007ffff2335596 in ?? () from /usr/lib64/libjack.so.0
#3  0x00007ffff2330f00 in ?? () from /usr/lib64/libjack.so.0
#4  0x00007fffef458e0e in start_thread () from /lib64/libpthread.so.0
#5  0x00007fffef1902cd in clone () from /lib64/libc.so.6

Thread 16 (Thread 0x7fffe40b1700 (LWP 3882)):
#0  0x00007fffef45c8f4 in pthread_cond_wait@@GLIBC_2.3.2 ()
   from /lib64/libpthread.so.0
#1  0x00007ffff2332554 in ?? () from /usr/lib64/libjack.so.0
#2  0x00007ffff232d821 in ?? () from /usr/lib64/libjack.so.0
#3  0x00007ffff2330f00 in ?? () from /usr/lib64/libjack.so.0
#4  0x00007fffef458e0e in start_thread () from /lib64/libpthread.so.0
#5  0x00007fffef1902cd in clone () from /lib64/libc.so.6

Thread 15 (Thread 0x7fffbe2c4700 (LWP 3878)):
#0  0x00007fffef45c8f4 in pthread_cond_wait@@GLIBC_2.3.2 ()
   from /lib64/libpthread.so.0
---Type <return> to continue, or q <return> to quit---
#1  0x00007ffff66626ef in g_cond_wait () from /usr/lib64/libglib-2.0.so.0
#2  0x00007fffd40c92a6 in gst_bus_timed_pop_filtered ()
   from /usr/lib64/libgstreamer-0.10.so.0
#3  0x00007fffd43af5fb in ?? ()
   from /usr/lib64/libcanberra-0.29/libcanberra-gstreamer.so
#4  0x00007fffef458e0e in start_thread () from /lib64/libpthread.so.0
#5  0x00007fffef1902cd in clone () from /lib64/libc.so.6

Thread 14 (Thread 0x7fffd51bb700 (LWP 3876)):
#0  0x00007fffef18814f in poll () from /lib64/libc.so.6
#1  0x00007fffaf9ad08f in ?? () from /usr/lib64/libpulse.so.0
#2  0x00007fffaf99e5fc in pa_mainloop_poll () from /usr/lib64/libpulse.so.0
#3  0x00007fffaf99ec59 in pa_mainloop_iterate () from /usr/lib64/libpulse.so.0
#4  0x00007fffaf99ed10 in pa_mainloop_run () from /usr/lib64/libpulse.so.0
#5  0x00007fffaf9ad03f in ?? () from /usr/lib64/libpulse.so.0
#6  0x00007fffaf5532e3 in ?? () from /usr/lib64/libpulsecommon-1.1.so
#7  0x00007fffef458e0e in start_thread () from /lib64/libpthread.so.0
#8  0x00007fffef1902cd in clone () from /lib64/libc.so.6

Thread 5 (Thread 0x7fffe4b79700 (LWP 3867)):
#0  0x00007fffef45c8f4 in pthread_cond_wait@@GLIBC_2.3.2 ()
   from /lib64/libpthread.so.0
#1  0x00007ffff66626ef in g_cond_wait () from /usr/lib64/libglib-2.0.so.0
---Type <return> to continue, or q <return> to quit---
#2  0x00007ffff79036f2 in ARDOUR::Analyser::work ()
    at libs/ardour/analyser.cc:85
#3  0x00007ffff790342d in analyser_work () at libs/ardour/analyser.cc:49
#4  0x0000000000c8532f in sigc::pointer_functor0<void>::operator() (this=
    0x14bd2e8) at /usr/include/sigc++-2.0/sigc++/functors/ptr_fun.h:77
#5  0x0000000000c846a4 in sigc::adaptor_functor<sigc::pointer_functor0<void> >::operator() (this=0x14bd2e0)
    at /usr/include/sigc++-2.0/sigc++/adaptors/adaptor_trait.h:251
#6  0x0000000000c82ff9 in sigc::internal::slot_call0<sigc::pointer_functor0<void>, void>::call_it (rep=0x14bd2b0)
    at /usr/include/sigc++-2.0/sigc++/functors/slot.h:103
#7  0x00007ffff6d6e1cd in ?? () from /usr/lib64/libglibmm-2.4.so.1
#8  0x00007ffff66490e5 in ?? () from /usr/lib64/libglib-2.0.so.0
#9  0x00007fffef458e0e in start_thread () from /lib64/libpthread.so.0
#10 0x00007fffef1902cd in clone () from /lib64/libc.so.6

Thread 4 (Thread 0x7fffe537a700 (LWP 3866)):
#0  0x00007fffef45c8f4 in pthread_cond_wait@@GLIBC_2.3.2 ()
   from /lib64/libpthread.so.0
#1  0x00007ffff66626ef in g_cond_wait () from /usr/lib64/libglib-2.0.so.0
#2  0x00007ffff7ac8539 in peak_thread_work ()
    at libs/ardour/source_factory.cc:65
#3  0x0000000000c8532f in sigc::pointer_functor0<void>::operator() (this=
---Type <return> to continue, or q <return> to quit---
    0x14bd088) at /usr/include/sigc++-2.0/sigc++/functors/ptr_fun.h:77
#4  0x0000000000c846a4 in sigc::adaptor_functor<sigc::pointer_functor0<void> >::operator() (this=0x14bd080)
    at /usr/include/sigc++-2.0/sigc++/adaptors/adaptor_trait.h:251
#5  0x0000000000c82ff9 in sigc::internal::slot_call0<sigc::pointer_functor0<void>, void>::call_it (rep=0x14bd050)
    at /usr/include/sigc++-2.0/sigc++/functors/slot.h:103
#6  0x00007ffff6d6e1cd in ?? () from /usr/lib64/libglibmm-2.4.so.1
#7  0x00007ffff66490e5 in ?? () from /usr/lib64/libglib-2.0.so.0
#8  0x00007fffef458e0e in start_thread () from /lib64/libpthread.so.0
#9  0x00007fffef1902cd in clone () from /lib64/libc.so.6

Thread 3 (Thread 0x7fffe5b7b700 (LWP 3865)):
#0  0x00007fffef45c8f4 in pthread_cond_wait@@GLIBC_2.3.2 ()
   from /lib64/libpthread.so.0
#1  0x00007ffff66626ef in g_cond_wait () from /usr/lib64/libglib-2.0.so.0
#2  0x00007ffff7ac8539 in peak_thread_work ()
    at libs/ardour/source_factory.cc:65
#3  0x0000000000c8532f in sigc::pointer_functor0<void>::operator() (this=
    0x14bce88) at /usr/include/sigc++-2.0/sigc++/functors/ptr_fun.h:77
#4  0x0000000000c846a4 in sigc::adaptor_functor<sigc::pointer_functor0<void> >::operator() (this=0x14bce80)
    at /usr/include/sigc++-2.0/sigc++/adaptors/adaptor_trait.h:251
---Type <return> to continue, or q <return> to quit---
#5  0x0000000000c82ff9 in sigc::internal::slot_call0<sigc::pointer_functor0<void>, void>::call_it (rep=0x14bce50)
    at /usr/include/sigc++-2.0/sigc++/functors/slot.h:103
#6  0x00007ffff6d6e1cd in ?? () from /usr/lib64/libglibmm-2.4.so.1
#7  0x00007ffff66490e5 in ?? () from /usr/lib64/libglib-2.0.so.0
#8  0x00007fffef458e0e in start_thread () from /lib64/libpthread.so.0
#9  0x00007fffef1902cd in clone () from /lib64/libc.so.6

Thread 2 (Thread 0x7fffe72aa700 (LWP 3864)):
#0  0x00007fffef18814f in poll () from /lib64/libc.so.6
#1  0x00007ffff6626684 in ?? () from /usr/lib64/libglib-2.0.so.0
#2  0x00007ffff6626ae2 in g_main_loop_run () from /usr/lib64/libglib-2.0.so.0
#3  0x00007ffff439ea26 in ?? () from /usr/lib64/libgio-2.0.so.0
#4  0x00007ffff66490e5 in ?? () from /usr/lib64/libglib-2.0.so.0
#5  0x00007fffef458e0e in start_thread () from /lib64/libpthread.so.0
#6  0x00007fffef1902cd in clone () from /lib64/libc.so.6

Thread 1 (Thread 0x7ffff7fd4980 (LWP 3860)):
#0  0x00007fffef45f2ed in read () from /lib64/libpthread.so.0
#1  0x00007ffff2332ce2 in ?? () from /usr/lib64/libjack.so.0
#2  0x00007ffff23389f5 in ?? () from /usr/lib64/libjack.so.0
#3  0x00007ffff23357d1 in ?? () from /usr/lib64/libjack.so.0
#4  0x00007ffff2336464 in ?? () from /usr/lib64/libjack.so.0
---Type <return> to continue, or q <return> to quit---
#5  0x00007ffff231f13e in ?? () from /usr/lib64/libjack.so.0
#6  0x00007ffff231a50c in jack_port_register () from /usr/lib64/libjack.so.0
#7  0x00007ffff7922e28 in ARDOUR::AudioEngine::register_output_port (this=
    0x1c294d0, type=..., portname="Flute_L/out 2")
    at libs/ardour/audioengine.cc:626
#8  0x00007ffff79c5c53 in ARDOUR::IO::ensure_io (this=0x23ef110, nin=1, nout=
    2, clear=true, src=0x23ef110) at libs/ardour/io.cc:1217
#9  0x00007ffff79c991e in ARDOUR::IO::create_ports (this=0x23ef110, node=...)
    at libs/ardour/io.cc:1948
#10 0x00007ffff79c8c9e in ARDOUR::IO::ports_became_legal (this=0x23ef110)
    at libs/ardour/io.cc:1809
#11 0x00007ffff79d3ce6 in sigc::bound_mem_functor0<int, ARDOUR::IO>::operator()
    (this=0x23efbc8) at /usr/include/sigc++-2.0/sigc++/functors/mem_fun.h:1787
#12 0x00007ffff79d34cc in sigc::adaptor_functor<sigc::bound_mem_functor0<int, ARDOUR::IO> >::operator() (this=0x23efbc0)
    at /usr/include/sigc++-2.0/sigc++/adaptors/adaptor_trait.h:251
#13 0x00007ffff79d2a51 in sigc::internal::slot_call0<sigc::bound_mem_functor0<int, ARDOUR::IO>, int>::call_it (rep=0x23efb90)
    at /usr/include/sigc++-2.0/sigc++/functors/slot.h:103
#14 0x00007ffff79d1a4a in sigc::internal::signal_emit0<int, sigc::nil>::emit (
    impl=0x23ac100) at /usr/include/sigc++-2.0/sigc++/signal.h:692
#15 0x00007ffff79d0460 in sigc::signal0<int, sigc::nil>::emit (this=
    0x7ffff7dd9d20 <ARDOUR::IO::PortsLegal>)
---Type <return> to continue, or q <return> to quit---
    at /usr/include/sigc++-2.0/sigc++/signal.h:2669
#16 0x00007ffff79cf00e in sigc::signal0<int, sigc::nil>::operator() (this=
    0x7ffff7dd9d20 <ARDOUR::IO::PortsLegal>)
    at /usr/include/sigc++-2.0/sigc++/signal.h:2677
#17 0x00007ffff79cc099 in ARDOUR::IO::enable_ports () at libs/ardour/io.cc:2433
#18 0x00007ffff7a3ddaa in ARDOUR::Session::hookup_io (this=0x1fc4b10)
    at libs/ardour/session.cc:922
#19 0x00007ffff7a3d3e2 in ARDOUR::Session::when_engine_running (this=0x1fc4b10)
    at libs/ardour/session.cc:841
#20 0x00007ffff7a9990a in ARDOUR::Session::second_stage_init (this=0x1fc4b10, 
    new_session=false) at libs/ardour/session_state.cc:331
#21 0x00007ffff7a37d2b in ARDOUR::Session::Session (this=0x1fc4b10, eng=..., 
    fullpath="/home/danson/composition/DissonantDance/Ardour2_DissonantDance", 
    snapshot_name="Ardour2_DissonantDance", mix_template="")
    at libs/ardour/session.cc:316
#22 0x0000000000922b6b in ARDOUR_UI::load_session (this=0x11d5600, path=
    "/home/danson/composition/DissonantDance/Ardour2_DissonantDance", 
    snap_name="Ardour2_DissonantDance", mix_template="")
    at gtk2_ardour/ardour_ui.cc:2668
#23 0x00000000009226db in ARDOUR_UI::get_session_parameters (this=0x11d5600, 
    backend_audio_is_running=true, should_be_new=false)
    at gtk2_ardour/ardour_ui.cc:2607
#24 0x000000000091a4d7 in ARDOUR_UI::startup (this=0x11d5600)
---Type <return> to continue, or q <return> to quit---
    at gtk2_ardour/ardour_ui.cc:669
#25 0x00000000009382a8 in sigc::bound_mem_functor0<void, ARDOUR_UI>::operator()
    (this=0x1287d48) at /usr/include/sigc++-2.0/sigc++/functors/mem_fun.h:1787
#26 0x00000000009368ba in sigc::adaptor_functor<sigc::bound_mem_functor0<void, ARDOUR_UI> >::operator() (this=0x1287d40)
    at /usr/include/sigc++-2.0/sigc++/adaptors/adaptor_trait.h:251
#27 0x0000000000933d95 in sigc::internal::slot_call0<sigc::bound_mem_functor0<void, ARDOUR_UI>, void>::call_it (rep=0x1287d10)
    at /usr/include/sigc++-2.0/sigc++/functors/slot.h:103
#28 0x0000000000928daa in sigc::internal::signal_emit0<void, sigc::nil>::emit (
    impl=0x1425b20) at /usr/include/sigc++-2.0/sigc++/signal.h:772
#29 0x000000000092dd04 in sigc::signal0<void, sigc::nil>::emit (this=0x11d5688)
    at /usr/include/sigc++-2.0/sigc++/signal.h:2669
#30 0x000000000092b414 in sigc::signal0<void, sigc::nil>::operator() (this=
    0x11d5688) at /usr/include/sigc++-2.0/sigc++/signal.h:2677
#31 0x00007ffff260dd14 in Gtkmm2ext::UI::run (this=0x11d5600, old_receiver=...)
    at libs/gtkmm2ext/gtk_ui.cc:229
#32 0x0000000000bdb540 in main (argc=1, argv=0x7fffffffd9b8)
    at gtk2_ardour/main.cc:585
(gdb) 