thread apply all bt

Thread 12 (Thread 5037):
#0  0x00007f6b3ac33f83 in poll () from /lib/libc.so.6
#1  0x00007f6b4469b202 in ARDOUR::Butler::thread_work (this=0x5e49770) at ../libs/ardour/butler.cc:159
#2  0x00007f6b4469b176 in ARDOUR::Butler::_thread_work (arg=0x5e49770) at ../libs/ardour/butler.cc:140
#3  0x00007f6b45a66694 in fake_thread_start (arg=0x5e8c980) at ../libs/pbd/pthread_utils.cc:81
#4  0x00007f6b3aee39ca in start_thread () from /lib/libpthread.so.0
#5  0x00007f6b3ac406fd in clone () from /lib/libc.so.6
#6  0x0000000000000000 in ?? ()

Thread 11 (Thread 5004):
#0  0x00007f6b3ac33f83 in poll () from /lib/libc.so.6
#1  0x00007f6b3683129a in ?? () from /usr/lib/libxcb.so.1
#2  0x00007f6b36832c2c in xcb_wait_for_reply () from /usr/lib/libxcb.so.1
#3  0x00007f6b384048d3 in _XReply () from /usr/lib/libX11.so.6
#4  0x00007f6b383f9c8d in XTranslateCoordinates () from /usr/lib/libX11.so.6
#5  0x00007f6b3f1ef6cd in ?? () from /usr/lib/libgdk-x11-2.0.so.0
#6  0x00007f6b3f1c092f in gdk_window_get_origin () from /usr/lib/libgdk-x11-2.0.so.0
#7  0x00007f6b33c812f6 in ca_gtk_proplist_set_for_widget () from /usr/lib/libcanberra-gtk.so.0
#8  0x00007f6b33c8174b in ca_gtk_proplist_set_for_event () from /usr/lib/libcanberra-gtk.so.0
#9  0x00007f6b33c81e2b in ca_gtk_play_for_event () from /usr/lib/libcanberra-gtk.so.0
#10 0x00007f6b33e87397 in ?? () from /usr/lib/gtk-2.0/modules/libcanberra-gtk-module.so
#11 0x00007f6b33e88333 in ?? () from /usr/lib/gtk-2.0/modules/libcanberra-gtk-module.so
#12 0x00007f6b3f1a0db6 in ?? () from /usr/lib/libgdk-x11-2.0.so.0
#13 0x00007f6b40f488c2 in g_main_context_dispatch () from /lib/libglib-2.0.so.0
#14 0x00007f6b40f4c748 in ?? () from /lib/libglib-2.0.so.0
#15 0x00007f6b40f4cc55 in g_main_loop_run () from /lib/libglib-2.0.so.0
#16 0x00007f6b3f56abb7 in gtk_main () from /usr/lib/libgtk-x11-2.0.so.0
#17 0x00007f6b435ca49b in Gtkmm2ext::UI::run (this=0x388c700, old_receiver=...) at ../libs/gtkmm2ext/gtk_ui.cc:265
#18 0x000000000139f644 in main (argc=1, argv=0x7fffc8a70298) at ../gtk2_ardour/main.cc:602

Thread 10 (Thread 5034):
#0  0x00007f6b3aeeb93d in read () from /lib/libpthread.so.0
#1  0x00007f6b41212592 in ?? () from /usr/lib/libjack.so.0
#2  0x00007f6b41214d34 in ?? () from /usr/lib/libjack.so.0
#3  0x00007f6b412106e0 in ?? () from /usr/lib/libjack.so.0
#4  0x00007f6b3aee39ca in start_thread () from /lib/libpthread.so.0
#5  0x00007f6b3ac406fd in clone () from /lib/libc.so.6
#6  0x0000000000000000 in ?? ()

Thread 9 (Thread 5039):
#0  0x00007f6b3b65f67e in __cxxabiv1::__si_class_type_info::__do_dyncast(long, __cxxabiv1::__class_type_info::__sub_kind, __cxxabiv1::__class_type_info const*, void const*, __cxxabiv1::__class_type_info const*, void const*, __cxxabiv1::__class_type_info::__dyncast_result&) const () from /usr/lib/libstdc++.so.6
#1  0x00007f6b3b65d45d in __dynamic_cast () from /usr/lib/libstdc++.so.6
#2  0x0000000001530ba7 in shared_ptr<ARDOUR::Processor> (this=0x7f6b046e7820, r=...) at /usr/include/boost/smart_ptr/shared_ptr.hpp:259
#3  0x000000000152c6cf in boost::dynamic_pointer_cast<ARDOUR::Send, ARDOUR::Processor> (r=...) at /usr/include/boost/smart_ptr/shared_ptr.hpp:522
#4  0x00007f6b44931c4a in ARDOUR::Route::meter (this=0x7f6b2f5ce740) at ../libs/ardour/route.cc:3424
#5  0x00007f6b4494a8a3 in boost::_mfi::mf0<void, ARDOUR::Route>::operator()(ARDOUR::Route*) const () from /usr/local/lib/ardour3/libardour.so.3
#6  0x00007f6b44946b3e in void boost::_bi::list1<boost::_bi::value<ARDOUR::Route*> >::operator()<boost::_mfi::mf0<void, ARDOUR::Route>, boost::_bi::list0>(boost::_bi::type<void>, boost::_mfi::mf0<void, ARDOUR::Route>&, boost::_bi::list0&, int) () from /usr/local/lib/ardour3/libardour.so.3
#7  0x00007f6b4494312f in boost::_bi::bind_t<void, boost::_mfi::mf0<void, ARDOUR::Route>, boost::_bi::list1<boost::_bi::value<ARDOUR::Route*> > >::operator()()
    () from /usr/local/lib/ardour3/libardour.so.3
#8  0x00007f6b449404cf in boost::detail::function::void_function_obj_invoker0<boost::_bi::bind_t<void, boost::_mfi::mf0<void, ARDOUR::Route>, boost::_bi::list1<boost::_bi::value<ARDOUR::Route*> > >, void>::invoke(boost::detail::function::function_buffer&) () from /usr/local/lib/ardour3/libardour.so.3
#9  0x0000000000f6fa4d in boost::function0<void>::operator() (this=0x7f6b2f79e558) at /usr/include/boost/function/function_template.hpp:1013
#10 0x0000000000f6abdd in boost::signals2::detail::signal0_impl<void, boost::signals2::optional_last_value<void>, int, std::less<int>, boost::function<void ()()>, boost::function<void ()(boost::signals2::connection const&)>, boost::signals2::mutex>::slot_invoker::m_invoke(boost::shared_ptr<boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int> >, boost::signals2::slot0<void, boost::function<void ()()> >, boost::signals2::mutex> > const&, boost::signals2::detail::void_type const*) const (this=0x7f6b046e7ce0, connectionBody=...)
    at /usr/include/boost/signals2/detail/signal_template.hpp:351
#11 0x0000000000f64457 in boost::signals2::detail::signal0_impl<void, boost::signals2::optional_last_value<void>, int, std::less<int>, boost::function<void ()()>, boost::function<void ()(boost::signals2::connection const&)>, boost::signals2::mutex>::slot_invoker::operator()(boost::shared_ptr<boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int> >, boost::signals2::slot0<void, boost::function<void ()()> >, boost::signals2::mutex> > const&) const (this=0x7f6b046e7ce0, connectionBody=...) at /usr/include/boost/signals2/detail/signal_template.hpp:340
---Type <return> to continue, or q <return> to quit---
#12 0x0000000000f5d4f9 in boost::signals2::detail::slot_call_iterator_t<boost::signals2::detail::signal0_impl<void, boost::signals2::optional_last_value<void>, int, std::less<int>, boost::function<void ()()>, boost::function<void ()(boost::signals2::connection const&)>, boost::signals2::mutex>::slot_invoker, std::_List_iterator<boost::shared_ptr<boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int> >, boost::signals2::slot0<void, boost::function<void ()()> >, boost::signals2::mutex> > >, boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int> >, boost::signals2::slot0<void, boost::function<void ()()> >, boost::signals2::mutex> >::dereference() const (this=0x7f6b046e7ae0)
    at /usr/include/boost/signals2/detail/slot_call_iterator.hpp:82
#13 0x0000000000f56bac in boost::signals2::detail::slot_call_iterator_t<boost::signals2::detail::signal0_impl<void, boost::signals2::optional_last_value<void>, int, std::less<int>, boost::function<void ()()>, boost::function<void ()(boost::signals2::connection const&)>, boost::signals2::mutex>::slot_invoker, std::_List_iterator<boost::shared_ptr<boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int> >, boost::signals2::slot0<void, boost::function<void ()()> >, boost::signals2::mutex> > >, boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int> >, boost::signals2::slot0<void, boost::function<void ()()> >, boost::signals2::mutex> >::reference boost::iterator_core_access::dereference<boost::signals2::detail::slot_call_iterator_t<boost::signals2::detail::signal0_impl<void, boost::signals2::optional_last_value<void>, int, std::less<int>, boost::function<void ()()>, boost::function<void ()(boost::signals2::connection const&)>, boost::signals2::mutex>::slot_invoker, std::_List_iterator<boost::shared_ptr<boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int> >, boost::signals2::slot0<void, boost::function<void ()()> >, boost::signals2::mutex> > >, boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int> >, boost::signals2::slot0<void, boost::function<void ()()> >, boost::signals2::mutex> > >(boost::signals2::detail::slot_call_iterator_t<boost::signals2::detail::signal0_impl<void, boost::signals2::optional_last_value<void>, int, std::less<int>, boost::function<void ()()>, boost::function<void ()(boost::signals2::connection const&)>, boost::signals2::mutex>::slot_invoker, std::_List_iterator<boost::shared_ptr<boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int> >, boost::signals2::slot0<void, boost::function<void ()()> >, boost::signals2::mutex> > >, boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int> >, boost::signals2::slot0<void, boost::function<void ()()> >, boost::signals2::mutex> > const&) (f=...) at /usr/include/boost/iterator/iterator_facade.hpp:516
#14 0x0000000000f503fe in boost::iterator_facade<boost::signals2::detail::slot_call_iterator_t<boost::signals2::detail::signal0_impl<void, boost::signals2::optional_last_value<void>, int, std::less<int>, boost::function<void ()()>, boost::function<void ()(boost::signals2::connection const&)>, boost::signals2::mutex>::slot_invoker, std::_List_iterator<boost::shared_ptr<boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int> >, boost::signals2::slot0<void, boost::function<void ()()> >, boost::signals2::mutex> > >, boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int> >, boost::signals2::slot0<void, boost::function<void ()()> >, boost::signals2::mutex> >, boost::signals2::detail::void_type, boost::single_pass_traversal_tag, boost::signals2::detail::void_type const&, long>::operator*() const (this=0x7f6b046e7ae0)
    at /usr/include/boost/iterator/iterator_facade.hpp:634
#15 0x0000000000f4b43a in void boost::signals2::optional_last_value<void>::operator()<boost::signals2::detail::slot_call_iterator_t<boost::signals2::detail::signal0_impl<void, boost::signals2::optional_last_value<void>, int, std::less<int>, boost::function<void ()()>, boost::function<void ()(boost::signals2::connection const&)>, boost::signals2::mutex>::slot_invoker, std::_List_iterator<boost::shared_ptr<boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int> >, boost::signals2::slot0<void, boost::function<void ()()> >, boost::signals2::mutex> > >, boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int> >, boost::signals2::slot0<void, boost::function<void ()()> >, boost::signals2::mutex> > >(boost::signals2::detail::slot_call_iterator_t<boost::signals2::detail::signal0_impl<void, boost::signals2::optional_last_value<void>, int, std::less<int>, boost::function<void ()()>, boost::function<void ()(boost::signals2::connection const&)>, boost::signals2::mutex>::slot_invoker, std::_List_iterator<boost::shared_ptr<boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int> >, boost::signals2::slot0<void, boost::function<void ()()> >, boost::signals2::mutex> > >, boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int> >, boost::signals2::slot0<void, boost::function<void ()()> >, boost::signals2::mutex> >, boost::signals2::detail::slot_call_iterator_t<boost::signals2::detail::signal0_impl<void, boost::signals2::optional_last_value<void>, int, std::less<int>, boost::function<void ()()>, boost::function<void ()(boost::signals2::connection const&)>, boost::signals2::mutex>::slot_invoker, std::_List_iterator<boost::shared_ptr<boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int> >, boost::signals2::slot0<void, boost::function<void ()()> >, boost::signals2::mutex> > >, boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int> >, boost::signals2::slot0<void, boost::function<void ()()> >, boost::signals2::mutex> >) const (this=0x38590c0, first=..., last=...) at /usr/include/boost/signals2/optional_last_value.hpp:55
#16 0x0000000000f461ab in void boost::signals2::detail::combiner_invoker<void>::operator()<boost::signals2::optional_last_value<void>, boost::signals2::detail::slot_call_iterator_t<boost::signals2::detail::signal0_impl<void, boost::signals2::optional_last_value<void>, int, std::less<int>, boost::function<void ()()>, boost::function<void ()(boost::signals2::connection const&)>, boost::signals2::mutex>::slot_invoker, std::_List_iterator<boost::shared_ptr<boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int> >, boost::signals2::slot0<void, boost::function<void ()()> >, boost::signals2::mutex> > >, boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int> >, boost::signals2::slot0<void, boost::function<void ()()> >, boost::signals2::mutex> > >(boost::signals2::optional_last_value<void>&, boost::signals2::detail::slot_call_iterator_t<boost::signals2::detail::signal0_impl<void, boost::signals2::optional_last_value<void>, int, std::less<int>, boost::function<void ()()>, boost::function<void ()(boost::signals2::connection const&)>, boost::signals2::mutex>::slot_invoker, std::_List_iterator<boost::shared_ptr<boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int> >, boost::signals2::slot0<void, boost::function<void ()()> >, boost::signals2::mutex> > >, boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int> >, boost::signals2::slot0<void, boost::function<void ()()> >, boost::signals2::mutex> >, boost::signals2::detail::slot_call_iterator_t<boost::signals2::detail::signal0_impl<void, boost::signals2::optional_last_value<void>, int, std::less<int>, boost::function<void ()()>, boost::function<void ()(boost::signals2::connection const&)>, boost::signals2::mutex>::slot_invoker, std::_List_iterator<boost::shared_ptr<boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int> >, boost::signals2::slot0<void, boost::function<void ()()> >, boost::signals2::mutex> > >, boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int> >, boost::signals2::slot0<void, boost::function<void ()()> >, boost::signals2::mutex> >) const (this=0x7f6b046e7c1e, combiner=..., 
    first=..., last=...) at /usr/include/boost/signals2/detail/result_type_wrapper.hpp:64
#17 0x0000000000f409f8 in boost::signals2::detail::signal0_impl<void, boost::signals2::optional_last_value<void>, int, std::less<int>, boost::function<void ()()>, boost::function<void ()(boost::signals2::connection const&)>, boost::signals2::mutex>::operator()() (this=0x3858fd0)
    at /usr/include/boost/signals2/detail/signal_template.hpp:246
#18 0x0000000000f3ad22 in boost::signals2::signal0<void, boost::signals2::optional_last_value<void>, int, std::less<int>, boost::function<void ()()>, boost::function<void ()(boost::signals2::connection const&)>, boost::signals2::mutex>::operator()() (this=0x7f6b45189b50)
---Type <return> to continue, or q <return> to quit---
    at /usr/include/boost/signals2/detail/signal_template.hpp:675
#19 0x0000000000f36a84 in PBD::Signal0<void>::operator() (this=0x7f6b45189b50) at ../libs/pbd/pbd/signals.h:104
#20 0x00007f6b446236bd in ARDOUR::AudioEngine::meter_thread (this=0x3ea9200) at ../libs/ardour/audioengine.cc:682
#21 0x00007f6b4463cf29 in boost::_mfi::mf0<void, ARDOUR::AudioEngine>::operator() (this=0x7f6b001629d0, p=0x3ea9200)
    at /usr/include/boost/bind/mem_fn_template.hpp:49
#22 0x00007f6b446396ac in boost::_bi::list1<boost::_bi::value<ARDOUR::AudioEngine*> >::operator()<boost::_mfi::mf0<void, ARDOUR::AudioEngine>, boost::_bi::list0> (this=0x7f6b001629e0, f=..., a=...) at /usr/include/boost/bind/bind.hpp:246
#23 0x00007f6b446362df in boost::_bi::bind_t<void, boost::_mfi::mf0<void, ARDOUR::AudioEngine>, boost::_bi::list1<boost::_bi::value<ARDOUR::AudioEngine*> > >::operator() (this=0x7f6b001629d0) at /usr/include/boost/bind/bind_template.hpp:20
#24 0x00007f6b4463293c 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=0x7f6b001629d0) at /usr/include/sigc++-2.0/sigc++/adaptors/adaptor_trait.h:251
#25 0x00007f6b4462f566 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=0x7f6b001629a0) at /usr/include/sigc++-2.0/sigc++/functors/slot.h:103
#26 0x00007f6b400dc862 in ?? () from /usr/lib/libglibmm-2.4.so.1
#27 0x00007f6b40f71b84 in ?? () from /lib/libglib-2.0.so.0
#28 0x00007f6b3aee39ca in start_thread () from /lib/libpthread.so.0
#29 0x00007f6b3ac406fd in clone () from /lib/libc.so.6
#30 0x0000000000000000 in ?? ()

Thread 8 (Thread 5033):
#0  0x00007f6b3aee885c in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
#1  0x00007f6b412121f1 in ?? () from /usr/lib/libjack.so.0
#2  0x00007f6b4120ae59 in ?? () from /usr/lib/libjack.so.0
#3  0x00007f6b412106e0 in ?? () from /usr/lib/libjack.so.0
#4  0x00007f6b3aee39ca in start_thread () from /lib/libpthread.so.0
#5  0x00007f6b3ac406fd in clone () from /lib/libc.so.6
#6  0x0000000000000000 in ?? ()

Thread 7 (Thread 5028):
#0  0x00007f6b3aee8bc9 in pthread_cond_timedwait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
#1  0x00007f6b3fc5b602 in ?? () from /usr/lib/libgthread-2.0.so.0
#2  0x00007f6b40f23851 in ?? () from /lib/libglib-2.0.so.0
#3  0x00007f6b40f23997 in g_async_queue_timed_pop () from /lib/libglib-2.0.so.0
#4  0x00007f6b40f739c8 in ?? () from /lib/libglib-2.0.so.0
#5  0x00007f6b40f71b84 in ?? () from /lib/libglib-2.0.so.0
#6  0x00007f6b3aee39ca in start_thread () from /lib/libpthread.so.0
#7  0x00007f6b3ac406fd in clone () from /lib/libc.so.6
#8  0x0000000000000000 in ?? ()

Thread 6 (Thread 5024):
#0  0x00007f6b3aee885c in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
#1  0x00007f6b445b2e21 in ARDOUR::Analyser::work () at ../libs/ardour/analyser.cc:85
#2  0x00007f6b445b2b51 in analyser_work () at ../libs/ardour/analyser.cc:49
#3  0x000000000153e7c5 in sigc::pointer_functor0<void>::operator()() const ()
#4  0x000000000153c9d2 in sigc::adaptor_functor<sigc::pointer_functor0<void> >::operator()() const ()
#5  0x0000000001539f1b in sigc::internal::slot_call0<sigc::pointer_functor0<void>, void>::call_it(sigc::internal::slot_rep*) ()
#6  0x00007f6b400dc862 in ?? () from /usr/lib/libglibmm-2.4.so.1
#7  0x00007f6b40f71b84 in ?? () from /lib/libglib-2.0.so.0
#8  0x00007f6b3aee39ca in start_thread () from /lib/libpthread.so.0
#9  0x00007f6b3ac406fd in clone () from /lib/libc.so.6
#10 0x0000000000000000 in ?? ()

Thread 5 (Thread 5023):
#0  0x00007f6b3aee885c in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
#1  0x00007f6b44a6e4a7 in peak_thread_work () at ../libs/ardour/source_factory.cc:69
#2  0x000000000153e7c5 in sigc::pointer_functor0<void>::operator()() const ()
#3  0x000000000153c9d2 in sigc::adaptor_functor<sigc::pointer_functor0<void> >::operator()() const ()
#4  0x0000000001539f1b in sigc::internal::slot_call0<sigc::pointer_functor0<void>, void>::call_it(sigc::internal::slot_rep*) ()
#5  0x00007f6b400dc862 in ?? () from /usr/lib/libglibmm-2.4.so.1
#6  0x00007f6b40f71b84 in ?? () from /lib/libglib-2.0.so.0
#7  0x00007f6b3aee39ca in start_thread () from /lib/libpthread.so.0
#8  0x00007f6b3ac406fd in clone () from /lib/libc.so.6
#9  0x0000000000000000 in ?? ()

---Type <return> to continue, or q <return> to quit---
Thread 4 (Thread 5022):
#0  0x00007f6b3aee885c in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
#1  0x00007f6b44a6e4a7 in peak_thread_work () at ../libs/ardour/source_factory.cc:69
#2  0x000000000153e7c5 in sigc::pointer_functor0<void>::operator()() const ()
#3  0x000000000153c9d2 in sigc::adaptor_functor<sigc::pointer_functor0<void> >::operator()() const ()
#4  0x0000000001539f1b in sigc::internal::slot_call0<sigc::pointer_functor0<void>, void>::call_it(sigc::internal::slot_rep*) ()
#5  0x00007f6b400dc862 in ?? () from /usr/lib/libglibmm-2.4.so.1
#6  0x00007f6b40f71b84 in ?? () from /lib/libglib-2.0.so.0
#7  0x00007f6b3aee39ca in start_thread () from /lib/libpthread.so.0
#8  0x00007f6b3ac406fd in clone () from /lib/libc.so.6
#9  0x0000000000000000 in ?? ()

Thread 3 (Thread 5036):
#0  0x00007f6b3aeeab50 in sem_wait () from /lib/libpthread.so.0
#1  0x00007f6b4478e422 in PBD::ProcessSemaphore::wait (this=0x5e86588) at ../libs/pbd/pbd/semutils.h:41
#2  0x00007f6b4478bb6b in ARDOUR::Graph::restart_cycle (this=0x5e864b0) at ../libs/ardour/graph.cc:206
#3  0x00007f6b4478bb35 in ARDOUR::Graph::dec_ref (this=0x5e864b0) at ../libs/ardour/graph.cc:192
#4  0x00007f6b447927f2 in ARDOUR::GraphNode::finish (this=0x7f6b2c4ac6f0, chain=0) at ../libs/ardour/graphnode.cc:61
#5  0x00007f6b4478cad3 in ARDOUR::Graph::run_one (this=0x5e864b0) at ../libs/ardour/graph.cc:352
#6  0x00007f6b4478ce00 in ARDOUR::Graph::main_thread (this=0x5e864b0) at ../libs/ardour/graph.cc:412
#7  0x00007f6b44791b73 in boost::_mfi::mf0<void, ARDOUR::Graph>::operator() (this=0x7f6b047e4d58, p=0x5e864b0) at /usr/include/boost/bind/mem_fn_template.hpp:49
#8  0x00007f6b447917e6 in boost::_bi::list1<boost::_bi::value<ARDOUR::Graph*> >::operator()<boost::_mfi::mf0<void, ARDOUR::Graph>, boost::_bi::list0> (
    this=0x7f6b047e4d68, f=..., a=...) at /usr/include/boost/bind/bind.hpp:246
#9  0x00007f6b4479150d in boost::_bi::bind_t<void, boost::_mfi::mf0<void, ARDOUR::Graph>, boost::_bi::list1<boost::_bi::value<ARDOUR::Graph*> > >::operator() (
    this=0x7f6b047e4d58) at /usr/include/boost/bind/bind_template.hpp:20
#10 0x00007f6b447910b5 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 /usr/include/boost/function/function_template.hpp:153
#11 0x0000000000f6fa4d in boost::function0<void>::operator() (this=0x7f6b047e4d50) at /usr/include/boost/function/function_template.hpp:1013
#12 0x00007f6b446268a3 in ARDOUR::AudioEngine::_start_process_thread (arg=0x5e86970) at ../libs/ardour/audioengine.cc:1483
#13 0x00007f6b3aee39ca in start_thread () from /lib/libpthread.so.0
#14 0x00007f6b3ac406fd in clone () from /lib/libc.so.6
#15 0x0000000000000000 in ?? ()

Thread 2 (Thread 5035):
#0  0x00007f6b3ac33f83 in poll () from /lib/libc.so.6
#1  0x00007f6b41211da6 in ?? () from /usr/lib/libjack.so.0
#2  0x00007f6b411f926a in ?? () from /usr/lib/libjack.so.0
#3  0x00007f6b411f6647 in ?? () from /usr/lib/libjack.so.0
#4  0x00007f6b446228cb in ARDOUR::AudioEngine::process_thread (this=0x3ea9200) at ../libs/ardour/audioengine.cc:437
#5  0x00007f6b4462269e in ARDOUR::AudioEngine::_process_thread (arg=0x3ea9200) at ../libs/ardour/audioengine.cc:379
#6  0x00007f6b411f7f3b in ?? () from /usr/lib/libjack.so.0
#7  0x00007f6b412106e0 in ?? () from /usr/lib/libjack.so.0
#8  0x00007f6b3aee39ca in start_thread () from /lib/libpthread.so.0
#9  0x00007f6b3ac406fd in clone () from /lib/libc.so.6
#10 0x0000000000000000 in ?? ()

Thread 1 (Thread 5038):
#0  0x00007f6b0441c4ec in PBD::Controllable::is_gain_like (this=0x0) at ../libs/pbd/pbd/controllable.h:72
#1  0x00007f6b0441b9bc in MIDIControllable::write_feedback (this=0x7f6b001675b0, buf=0x7f6b29a68893 "", bufsize=@0x7f6b29a68828)
    at ../libs/surfaces/generic_midi/midicontrollable.cc:377
#2  0x00007f6b043e2dea in GenericMidiControlProtocol::_send_feedback (this=0x7f6b2c3f4480) at ../libs/surfaces/generic_midi/generic_midi_control_protocol.cc:257
#3  0x00007f6b043e2d41 in GenericMidiControlProtocol::send_feedback (this=0x7f6b2c3f4480) at ../libs/surfaces/generic_midi/generic_midi_control_protocol.cc:243
#4  0x00007f6b043f85ad in boost::_mfi::mf0<void, GenericMidiControlProtocol>::operator() (this=0x7f6af81184a8, p=0x7f6b2c3f4480)
    at /usr/include/boost/bind/mem_fn_template.hpp:49
#5  0x00007f6b043f4bac in boost::_bi::list1<boost::_bi::value<GenericMidiControlProtocol*> >::operator()<boost::_mfi::mf0<void, GenericMidiControlProtocol>, boost::_bi::list0> (this=0x7f6af81184b8, f=..., a=...) at /usr/include/boost/bind/bind.hpp:246
#6  0x00007f6b043f1a27 in boost::_bi::bind_t<void, boost::_mfi::mf0<void, GenericMidiControlProtocol>, boost::_bi::list1<boost::_bi::value<GenericMidiControlProtocol*> > >::operator() (this=0x7f6af81184a8) at /usr/include/boost/bind/bind_template.hpp:20
#7  0x00007f6b043ef868 in boost::detail::function::void_function_obj_invoker0<boost::_bi::bind_t<void, boost::_mfi::mf0<void, GenericMidiControlProtocol>, boost::_bi::list1<boost::_bi::value<GenericMidiControlProtocol*> > >, void>::invoke (function_obj_ptr=...) at /usr/include/boost/function/function_template.hpp:153
#8  0x0000000000f6fa4d in boost::function0<void>::operator() (this=0x7f6af81184a0) at /usr/include/boost/function/function_template.hpp:1013
#9  0x00007f6b44841f31 in ARDOUR::MidiControlUI::do_request (this=0x602bf20, req=0x7f6af8118490) at ../libs/ardour/midi_ui.cc:78
#10 0x00007f6b4484caae in AbstractUI<ARDOUR::MidiUIRequest>::handle_ui_requests (this=0x602bf20) at ../libs/pbd/pbd/abstract_ui.cc:151
#11 0x00007f6b45a3119d in BaseUI::request_handler (this=0x602bf20, ioc=Glib::IO_IN) at ../libs/pbd/base_ui.cc:121
---Type <return> to continue, or q <return> to quit---
#12 0x00007f6b45a322a6 in sigc::bound_mem_functor1<bool, BaseUI, Glib::IOCondition>::operator() (this=0x5e8cef8, _A_a1=@0x7f6b29a6cb3c)
    at /usr/include/sigc++-2.0/sigc++/functors/mem_fun.h:1851
#13 0x00007f6b45a32083 in sigc::adaptor_functor<sigc::bound_mem_functor1<bool, BaseUI, Glib::IOCondition> >::operator()<Glib::IOCondition const&> (
    this=0x5e8cef0, _A_arg1=@0x7f6b29a6cb3c) at /usr/include/sigc++-2.0/sigc++/adaptors/adaptor_trait.h:84
#14 0x00007f6b45a31d98 in sigc::internal::slot_call1<sigc::bound_mem_functor1<bool, BaseUI, Glib::IOCondition>, bool, Glib::IOCondition>::call_it (
    rep=0x5e8cec0, a_1=@0x7f6b29a6cb3c) at /usr/include/sigc++-2.0/sigc++/functors/slot.h:137
#15 0x00007f6b400dfb6e in Glib::IOSource::dispatch(sigc::slot_base*) () from /usr/lib/libglibmm-2.4.so.1
#16 0x00007f6b400dfcbf in Glib::Source::dispatch_vfunc(_GSource*, int (*)(void*), void*) () from /usr/lib/libglibmm-2.4.so.1
#17 0x00007f6b40f488c2 in g_main_context_dispatch () from /lib/libglib-2.0.so.0
#18 0x00007f6b40f4c748 in ?? () from /lib/libglib-2.0.so.0
#19 0x00007f6b40f4cc55 in g_main_loop_run () from /lib/libglib-2.0.so.0
#20 0x00007f6b45a30ebb in BaseUI::main_thread (this=0x602bf20) at ../libs/pbd/base_ui.cc:76
#21 0x00007f6b45a32367 in sigc::bound_mem_functor0<void, BaseUI>::operator() (this=0x602c838) at /usr/include/sigc++-2.0/sigc++/functors/mem_fun.h:1787
#22 0x00007f6b45a321c2 in sigc::adaptor_functor<sigc::bound_mem_functor0<void, BaseUI> >::operator() (this=0x602c830)
    at /usr/include/sigc++-2.0/sigc++/adaptors/adaptor_trait.h:251
#23 0x00007f6b45a31f1b in sigc::internal::slot_call0<sigc::bound_mem_functor0<void, BaseUI>, void>::call_it (rep=0x602c800)
    at /usr/include/sigc++-2.0/sigc++/functors/slot.h:103
#24 0x00007f6b400dc862 in ?? () from /usr/lib/libglibmm-2.4.so.1
#25 0x00007f6b40f71b84 in ?? () from /lib/libglib-2.0.so.0
#26 0x00007f6b3aee39ca in start_thread () from /lib/libpthread.so.0
#27 0x00007f6b3ac406fd in clone () from /lib/libc.so.6
#28 0x0000000000000000 in ?? ()