colinf@colinf-xps15:~/src/ardour/ardour$ gtk2_ardour/ardbg-core 
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Reading symbols from /home/colinf/src/ardour/ardour/build/gtk2_ardour/ardour-8.2.2...

warning: Can't open file /SYSV00000000 (deleted) during file-backed mapping note processing

warning: Can't open file /SYSV00282929 (deleted) during file-backed mapping note processing
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[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
--Type <RET> for more, q to quit, c to continue without paging--
Core was generated by `/home/colinf/src/ardour/ardour/build/gtk2_ardour/ardour-8.2.2'.
Program terminated with signal SIGABRT, Aborted.
#0  __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:50
50	../sysdeps/unix/sysv/linux/raise.c: No such file or directory.
[Current thread is 1 (Thread 0x7fca468d0180 (LWP 479267))]
(gdb) thread apply all bt

Thread 46 (Thread 0x7fca45fff700 (LWP 479272)):
#0  0x00007fca4aa9a1a1 in __GI___clock_nanosleep (clock_id=clock_id@entry=0, flags=flags@entry=0, req=0x7fca45ffe860, rem=0x7fca45ffe870) at ../sysdeps/unix/sysv/linux/clock_nanosleep.c:48
#1  0x00007fca4aa9f983 in __GI___nanosleep (requested_time=<optimized out>, remaining=<optimized out>) at nanosleep.c:27
#2  0x00007fca4c1fbb4f in g_usleep () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x000055f96b8df79b in gui_event_loop(void*) (ptr=0x0) at ../gtk2_ardour/linux_vst_gui_support.cc:468
#4  0x00007fca4bec8ea7 in start_thread (arg=<optimized out>) at pthread_create.c:477
#5  0x00007fca4aad3a2f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 45 (Thread 0x7fc9a2ffd700 (LWP 479384)):
#0  syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:38
#1  0x00007fca4c22234f in g_cond_wait () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fca4f3f6afd in ArdourWaveView::WaveViewThreads::_dequeue_draw_request() (this=0x55f97634cbf0) at ../libs/waveview/wave_view_private.cc:323
#3  0x00007fca4f3f6a81 in ArdourWaveView::WaveViewThreads::dequeue_draw_request() () at ../libs/waveview/wave_view_private.cc:312
#4  0x00007fca4f3f6f81 in ArdourWaveView::WaveViewThreads::_thread_proc() (this=0x55f97634cbf0) at ../libs/waveview/wave_view_private.cc:501
#5  0x00007fca4f3f6f28 in ArdourWaveView::WaveViewThreads::thread_proc() () at ../libs/waveview/wave_view_private.cc:415
#6  0x00007fca4f3fab32 in boost::detail::function::void_function_invoker0<void (*)(), void>::invoke(boost::detail::function::function_buffer&) (function_ptr=...) at /usr/include/boost/function/function_template.hpp:117
#7  0x000055f96aa4538c in boost::function0<void>::operator()() const (this=0x55f9773a34d8) at /usr/include/boost/function/function_template.hpp:763
#8  0x00007fca4c3dcad1 in PBD::Thread::_run(void*) (arg=0x55f9773a34b0) at ../libs/pbd/pthread_utils.cc:488
#9  0x00007fca4bec8ea7 in start_thread (arg=<optimized out>) at pthread_create.c:477
#10 0x00007fca4aad3a2f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 44 (Thread 0x7fc9e4ff6700 (LWP 479376)):
#0  0x00007fca4aac796f in __GI___poll (fds=0x7fc9b005b100, nfds=3, timeout=9) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007fca4c1d10ae in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fca4c1d140b in g_main_loop_run () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fca4c39ff58 in BaseUI::main_thread() (this=0x55f972baee08) at ../libs/pbd/base_ui.cc:102
#4  0x00007fca4c3a44bf in boost::_mfi::mf0<void, BaseUI>::operator()(BaseUI*) const (this=0x55f970850230, p=0x55f972baee08) at /usr/include/boost/bind/mem_fn_template.hpp:49
#5  0x00007fca4c3a4189 in boost::_bi::list1<boost::_bi::value<BaseUI*> >::operator()<boost::_mfi::mf0<void, BaseUI>, boost::_bi::list0>(boost::_bi::type<void>, boost::_mfi::mf0<void, BaseUI>&, boost::_bi::list0&, int) (this=0x55f970850240, f=..., a=...) at /usr/include/boost/bind/bind.hpp:259
#6  0x00007fca4c3a3df7 in boost::_bi::bind_t<void, boost::_mfi::mf0<void, BaseUI>, boost::_bi::list1<boost::_bi::value<BaseUI*> > >::operator()() (this=0x55f970850230) at /usr/include/boost/bind/bind.hpp:1294
#7  0x00007fca4c3a390d in boost::detail::function::void_function_obj_invoker0<boost::_bi::bind_t<void, boost::_mfi::mf0<void, BaseUI>, boost::_bi::list1<boost::_bi::value<BaseUI*> > >, void>::invoke(boost::detail::function::function_buffer&) (function_obj_ptr=...) at /usr/include/boost/function/function_template.hpp:158
#8  0x000055f96aa4538c in boost::function0<void>::operator()() const (this=0x55f970850228) at /usr/include/boost/function/function_template.hpp:763
#9  0x00007fca4c3dcad1 in PBD::Thread::_run(void*) (arg=0x55f970850200) at ../libs/pbd/pthread_utils.cc:488
#10 0x00007fca4bec8ea7 in start_thread (arg=<optimized out>) at pthread_create.c:477
#11 0x00007fca4aad3a2f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 43 (Thread 0x7fc9e6ffd700 (LWP 479372)):
#0  0x00007fca4aac796f in __GI___poll (fds=0x7fc9c0041a50, nfds=4, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007fca4c1d10ae in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fca4c1d140b in g_main_loop_run () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fca4c39ff58 in BaseUI::main_thread() (this=0x55f970381a30) at ../libs/pbd/base_ui.cc:102
#4  0x00007fca4c3a44bf in boost::_mfi::mf0<void, BaseUI>::operator()(BaseUI*) const (this=0x55f9717bb9e0, p=0x55f970381a30) at /usr/include/boost/bind/mem_fn_template.hpp:49
--Type <RET> for more, q to quit, c to continue without paging--
#5  0x00007fca4c3a4189 in boost::_bi::list1<boost::_bi::value<BaseUI*> >::operator()<boost::_mfi::mf0<void, BaseUI>, boost::_bi::list0>(boost::_bi::type<void>, boost::_mfi::mf0<void, BaseUI>&, boost::_bi::list0&, int) (this=0x55f9717bb9f0, f=..., a=...) at /usr/include/boost/bind/bind.hpp:259
#6  0x00007fca4c3a3df7 in boost::_bi::bind_t<void, boost::_mfi::mf0<void, BaseUI>, boost::_bi::list1<boost::_bi::value<BaseUI*> > >::operator()() (this=0x55f9717bb9e0) at /usr/include/boost/bind/bind.hpp:1294
#7  0x00007fca4c3a390d in boost::detail::function::void_function_obj_invoker0<boost::_bi::bind_t<void, boost::_mfi::mf0<void, BaseUI>, boost::_bi::list1<boost::_bi::value<BaseUI*> > >, void>::invoke(boost::detail::function::function_buffer&) (function_obj_ptr=...) at /usr/include/boost/function/function_template.hpp:158
#8  0x000055f96aa4538c in boost::function0<void>::operator()() const (this=0x55f9717bb9d8) at /usr/include/boost/function/function_template.hpp:763
#9  0x00007fca4c3dcad1 in PBD::Thread::_run(void*) (arg=0x55f9717bb9b0) at ../libs/pbd/pthread_utils.cc:488
#10 0x00007fca4bec8ea7 in start_thread (arg=<optimized out>) at pthread_create.c:477
#11 0x00007fca4aad3a2f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 42 (Thread 0x7fc9a27fc700 (LWP 479385)):
#0  syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:38
#1  0x00007fca4c22234f in g_cond_wait () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fca4f3f6afd in ArdourWaveView::WaveViewThreads::_dequeue_draw_request() (this=0x55f97634cbf0) at ../libs/waveview/wave_view_private.cc:323
#3  0x00007fca4f3f6a81 in ArdourWaveView::WaveViewThreads::dequeue_draw_request() () at ../libs/waveview/wave_view_private.cc:312
#4  0x00007fca4f3f6f81 in ArdourWaveView::WaveViewThreads::_thread_proc() (this=0x55f97634cbf0) at ../libs/waveview/wave_view_private.cc:501
#5  0x00007fca4f3f6f28 in ArdourWaveView::WaveViewThreads::thread_proc() () at ../libs/waveview/wave_view_private.cc:415
#6  0x00007fca4f3fab32 in boost::detail::function::void_function_invoker0<void (*)(), void>::invoke(boost::detail::function::function_buffer&) (function_ptr=...) at /usr/include/boost/function/function_template.hpp:117
#7  0x000055f96aa4538c in boost::function0<void>::operator()() const (this=0x55f97692cfa8) at /usr/include/boost/function/function_template.hpp:763
#8  0x00007fca4c3dcad1 in PBD::Thread::_run(void*) (arg=0x55f97692cf80) at ../libs/pbd/pthread_utils.cc:488
#9  0x00007fca4bec8ea7 in start_thread (arg=<optimized out>) at pthread_create.c:477
#10 0x00007fca4aad3a2f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 41 (Thread 0x7fca294d7700 (LWP 479356)):
#0  syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:38
#1  0x00007fca4c3e2ab0 in PBD::Semaphore::wait() (this=0x55f96eb89174) at ../libs/pbd/semutils.cc:120
#2  0x00007fca4e2d3052 in ARDOUR::Graph::run_one() (this=0x55f96eb89040) at ../libs/ardour/graph.cc:320
#3  0x00007fca4e2d3a55 in ARDOUR::Graph::main_thread() (this=0x55f96eb89040) at ../libs/ardour/graph.cc:425
#4  0x00007fca4e2de2e5 in boost::_mfi::mf0<void, ARDOUR::Graph>::operator()(ARDOUR::Graph*) const (this=0x7fca294d6928, p=0x55f96eb89040) at /usr/include/boost/bind/mem_fn_template.hpp:49
#5  0x00007fca4e2dd9c7 in boost::_bi::list1<boost::_bi::value<ARDOUR::Graph*> >::operator()<boost::_mfi::mf0<void, ARDOUR::Graph>, boost::_bi::list0>(boost::_bi::type<void>, boost::_mfi::mf0<void, ARDOUR::Graph>&, boost::_bi::list0&, int) (this=0x7fca294d6938, f=..., a=...) at /usr/include/boost/bind/bind.hpp:259
#6  0x00007fca4e2dcb31 in boost::_bi::bind_t<void, boost::_mfi::mf0<void, ARDOUR::Graph>, boost::_bi::list1<boost::_bi::value<ARDOUR::Graph*> > >::operator()() (this=0x7fca294d6928) at /usr/include/boost/bind/bind.hpp:1294
#7  0x00007fca4e2db5c6 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(boost::detail::function::function_buffer&) (function_obj_ptr=...) at /usr/include/boost/function/function_template.hpp:158
#8  0x000055f96aa4538c in boost::function0<void>::operator()() const (this=0x7fca294d6920) at /usr/include/boost/function/function_template.hpp:763
#9  0x00007fca363bbd8b in ARDOUR::JACKAudioBackend::_start_process_thread(void*) (arg=0x55f97167b510) at ../libs/backends/jack/jack_audiobackend.cc:970
#10 0x00007fca36e910ad in jack_thread_proxy (varg=0x55f97167b5f0) at thread.c:143
#11 0x00007fca4bec8ea7 in start_thread (arg=<optimized out>) at pthread_create.c:477
#12 0x00007fca4aad3a2f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 40 (Thread 0x7fc9a17fa700 (LWP 479387)):
#0  syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:38
#1  0x00007fca4c22234f in g_cond_wait () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
--Type <RET> for more, q to quit, c to continue without paging--
#2  0x00007fca4f3f6afd in ArdourWaveView::WaveViewThreads::_dequeue_draw_request() (this=0x55f97634cbf0) at ../libs/waveview/wave_view_private.cc:323
#3  0x00007fca4f3f6a81 in ArdourWaveView::WaveViewThreads::dequeue_draw_request() () at ../libs/waveview/wave_view_private.cc:312
#4  0x00007fca4f3f6f81 in ArdourWaveView::WaveViewThreads::_thread_proc() (this=0x55f97634cbf0) at ../libs/waveview/wave_view_private.cc:501
#5  0x00007fca4f3f6f28 in ArdourWaveView::WaveViewThreads::thread_proc() () at ../libs/waveview/wave_view_private.cc:415
#6  0x00007fca4f3fab32 in boost::detail::function::void_function_invoker0<void (*)(), void>::invoke(boost::detail::function::function_buffer&) (function_ptr=...) at /usr/include/boost/function/function_template.hpp:117
#7  0x000055f96aa4538c in boost::function0<void>::operator()() const (this=0x55f97739c6d8) at /usr/include/boost/function/function_template.hpp:763
#8  0x00007fca4c3dcad1 in PBD::Thread::_run(void*) (arg=0x55f97739c6b0) at ../libs/pbd/pthread_utils.cc:488
#9  0x00007fca4bec8ea7 in start_thread (arg=<optimized out>) at pthread_create.c:477
#10 0x00007fca4aad3a2f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 39 (Thread 0x7fca2a3fe700 (LWP 479282)):
#0  0x00007fca4aac796f in __GI___poll (fds=0x55f96e47b6c0, nfds=2, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007fca4c1d10ae in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fca4c1d140b in g_main_loop_run () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fca4a1eaa36 in  () at /lib/x86_64-linux-gnu/libgio-2.0.so.0
#4  0x00007fca4c1fa0bd in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007fca4bec8ea7 in start_thread (arg=<optimized out>) at pthread_create.c:477
#6  0x00007fca4aad3a2f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 38 (Thread 0x7fca2abff700 (LWP 479281)):
#0  0x00007fca4aac796f in __GI___poll (fds=0x55f96e4700b0, nfds=2, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007fca4c1d10ae in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fca4c1d11cf in g_main_context_iteration () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fca4c1d1221 in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007fca4c1fa0bd in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007fca4bec8ea7 in start_thread (arg=<optimized out>) at pthread_create.c:477
#6  0x00007fca4aad3a2f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 37 (Thread 0x7fca282f8700 (LWP 479371)):
#0  0x00007fca4aac796f in __GI___poll (fds=0x7fca282f6f94, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007fca4c3b7106 in CrossThreadChannel::poll_for_request() (this=0x55f97333bec8) at ../libs/pbd/crossthread.posix.cc:108
#2  0x00007fca4c3b7177 in CrossThreadChannel::receive(char&, bool) (this=0x55f97333bec8, msg=@0x7fca282f704f: 0 '\000', wait=true) at ../libs/pbd/crossthread.posix.cc:133
#3  0x00007fca4e1931a8 in ARDOUR::Butler::thread_work() (this=0x55f97333be20) at ../libs/ardour/butler.cc:188
#4  0x00007fca4e192f2d in ARDOUR::Butler::_thread_work(void*) (arg=0x55f97333be20) at ../libs/ardour/butler.cc:170
#5  0x00007fca4c3dc052 in fake_thread_start(void*) (arg=0x55f9716e9aa0) at ../libs/pbd/pthread_utils.cc:101
#6  0x00007fca4bec8ea7 in start_thread (arg=<optimized out>) at pthread_create.c:477
#7  0x00007fca4aad3a2f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 36 (Thread 0x7fca28f6d700 (LWP 479363)):
#0  syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:38
#1  0x00007fca4c3e2ab0 in PBD::Semaphore::wait() (this=0x55f96eb89174) at ../libs/pbd/semutils.cc:120
#2  0x00007fca4e2d3052 in ARDOUR::Graph::run_one() (this=0x55f96eb89040) at ../libs/ardour/graph.cc:320
#3  0x00007fca4e2d35f3 in ARDOUR::Graph::helper_thread() (this=0x55f96eb89040) at ../libs/ardour/graph.cc:372
#4  0x00007fca4e2de2e5 in boost::_mfi::mf0<void, ARDOUR::Graph>::operator()(ARDOUR::Graph*) const (this=0x7fca28f6c928, p=0x55f96eb89040) at /usr/include/boost/bind/mem_fn_template.hpp:49
#5  0x00007fca4e2dd9c7 in boost::_bi::list1<boost::_bi::value<ARDOUR::Graph*> >::operator()<boost::_mfi::mf0<void, ARDOUR::Graph>, boost::_bi::list0>(boost::_bi::type<void>, boost::_mfi::mf0--Type <RET> for more, q to quit, c to continue without paging--
<void, ARDOUR::Graph>&, boost::_bi::list0&, int) (this=0x7fca28f6c938, f=..., a=...) at /usr/include/boost/bind/bind.hpp:259
#6  0x00007fca4e2dcb31 in boost::_bi::bind_t<void, boost::_mfi::mf0<void, ARDOUR::Graph>, boost::_bi::list1<boost::_bi::value<ARDOUR::Graph*> > >::operator()() (this=0x7fca28f6c928) at /usr/include/boost/bind/bind.hpp:1294
#7  0x00007fca4e2db5c6 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(boost::detail::function::function_buffer&) (function_obj_ptr=...) at /usr/include/boost/function/function_template.hpp:158
#8  0x000055f96aa4538c in boost::function0<void>::operator()() const (this=0x7fca28f6c920) at /usr/include/boost/function/function_template.hpp:763
#9  0x00007fca363bbd8b in ARDOUR::JACKAudioBackend::_start_process_thread(void*) (arg=0x55f97168ee20) at ../libs/backends/jack/jack_audiobackend.cc:970
#10 0x00007fca36e910ad in jack_thread_proxy (varg=0x55f97168ee60) at thread.c:143
#11 0x00007fca4bec8ea7 in start_thread (arg=<optimized out>) at pthread_create.c:477
#12 0x00007fca4aad3a2f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 35 (Thread 0x7fca28fee700 (LWP 479362)):
#0  syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:38
#1  0x00007fca4c3e2ab0 in PBD::Semaphore::wait() (this=0x55f96eb89174) at ../libs/pbd/semutils.cc:120
#2  0x00007fca4e2d3052 in ARDOUR::Graph::run_one() (this=0x55f96eb89040) at ../libs/ardour/graph.cc:320
#3  0x00007fca4e2d35f3 in ARDOUR::Graph::helper_thread() (this=0x55f96eb89040) at ../libs/ardour/graph.cc:372
#4  0x00007fca4e2de2e5 in boost::_mfi::mf0<void, ARDOUR::Graph>::operator()(ARDOUR::Graph*) const (this=0x7fca28fed928, p=0x55f96eb89040) at /usr/include/boost/bind/mem_fn_template.hpp:49
#5  0x00007fca4e2dd9c7 in boost::_bi::list1<boost::_bi::value<ARDOUR::Graph*> >::operator()<boost::_mfi::mf0<void, ARDOUR::Graph>, boost::_bi::list0>(boost::_bi::type<void>, boost::_mfi::mf0<void, ARDOUR::Graph>&, boost::_bi::list0&, int) (this=0x7fca28fed938, f=..., a=...) at /usr/include/boost/bind/bind.hpp:259
#6  0x00007fca4e2dcb31 in boost::_bi::bind_t<void, boost::_mfi::mf0<void, ARDOUR::Graph>, boost::_bi::list1<boost::_bi::value<ARDOUR::Graph*> > >::operator()() (this=0x7fca28fed928) at /usr/include/boost/bind/bind.hpp:1294
#7  0x00007fca4e2db5c6 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(boost::detail::function::function_buffer&) (function_obj_ptr=...) at /usr/include/boost/function/function_template.hpp:158
#8  0x000055f96aa4538c in boost::function0<void>::operator()() const (this=0x7fca28fed920) at /usr/include/boost/function/function_template.hpp:763
#9  0x00007fca363bbd8b in ARDOUR::JACKAudioBackend::_start_process_thread(void*) (arg=0x55f97168eb90) at ../libs/backends/jack/jack_audiobackend.cc:970
#10 0x00007fca36e910ad in jack_thread_proxy (varg=0x55f97168ebd0) at thread.c:143
#11 0x00007fca4bec8ea7 in start_thread (arg=<optimized out>) at pthread_create.c:477
#12 0x00007fca4aad3a2f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 34 (Thread 0x7fc9b67fc700 (LWP 479380)):
#0  futex_wait_cancelable (private=0, expected=0, futex_word=0x55f972607f20) at ../sysdeps/nptl/futex-internal.h:186
#1  __pthread_cond_wait_common (abstime=0x0, clockid=0, mutex=0x55f972607ed0, cond=0x55f972607ef8) at pthread_cond_wait.c:508
#2  __pthread_cond_wait (cond=0x55f972607ef8, mutex=0x55f972607ed0) at pthread_cond_wait.c:638
#3  0x00007fca4e64b04d in ARDOUR::Session::auto_connect_thread_run() (this=0x55f972605d20) at ../libs/ardour/session.cc:7910
#4  0x00007fca4e64aa9a in ARDOUR::Session::auto_connect_thread(void*) (arg=0x55f972605d20) at ../libs/ardour/session.cc:7841
#5  0x00007fca4bec8ea7 in start_thread (arg=<optimized out>) at pthread_create.c:477
#6  0x00007fca4aad3a2f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 33 (Thread 0x7fca37fff700 (LWP 479275)):
#0  syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:38
#1  0x00007fca4c22234f in g_cond_wait () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fca4e0bf92a in ARDOUR::Analyser::work() () at ../libs/ardour/analyser.cc:95
#3  0x000055f96b3e51bd in sigc::pointer_functor0<void>::operator()() const (this=0x55f96dbb1540) at /usr/include/sigc++-2.0/sigc++/functors/ptr_fun.h:77
#4  0x00007fca4e0c2b79 in boost::detail::function::void_function_obj_invoker0<sigc::pointer_functor0<void>, void>::invoke(boost::detail::function::function_buffer&) (function_obj_ptr=...) at /usr/include/boost/function/function_template.hpp:158
#5  0x000055f96aa4538c in boost::function0<void>::operator()() const (this=0x55f96dbb1538) at /usr/include/boost/function/function_template.hpp:763
--Type <RET> for more, q to quit, c to continue without paging--
#6  0x00007fca4c3dcad1 in PBD::Thread::_run(void*) (arg=0x55f96dbb1510) at ../libs/pbd/pthread_utils.cc:488
#7  0x00007fca4bec8ea7 in start_thread (arg=<optimized out>) at pthread_create.c:477
#8  0x00007fca4aad3a2f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 32 (Thread 0x7fca2bfff700 (LWP 479279)):
#0  syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:38
#1  0x00007fca4c22234f in g_cond_wait () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fca4e110ad1 in ARDOUR::AudioEngine::do_devicelist_update() (this=0x55f96e2b0a00) at ../libs/ardour/audioengine.cc:760
#3  0x00007fca4e11efa9 in boost::_mfi::mf0<void, ARDOUR::AudioEngine>::operator()(ARDOUR::AudioEngine*) const (this=0x55f96e2cdfa0, p=0x55f96e2b0a00) at /usr/include/boost/bind/mem_fn_template.hpp:49
#4  0x00007fca4e11e58d in boost::_bi::list1<boost::_bi::value<ARDOUR::AudioEngine*> >::operator()<boost::_mfi::mf0<void, ARDOUR::AudioEngine>, boost::_bi::list0>(boost::_bi::type<void>, boost::_mfi::mf0<void, ARDOUR::AudioEngine>&, boost::_bi::list0&, int) (this=0x55f96e2cdfb0, f=..., a=...) at /usr/include/boost/bind/bind.hpp:259
#5  0x00007fca4e11dbe9 in boost::_bi::bind_t<void, boost::_mfi::mf0<void, ARDOUR::AudioEngine>, boost::_bi::list1<boost::_bi::value<ARDOUR::AudioEngine*> > >::operator()() (this=0x55f96e2cdfa0) at /usr/include/boost/bind/bind.hpp:1294
#6  0x00007fca4e11d077 in boost::detail::function::void_function_obj_invoker0<boost::_bi::bind_t<void, boost::_mfi::mf0<void, ARDOUR::AudioEngine>, boost::_bi::list1<boost::_bi::value<ARDOUR::AudioEngine*> > >, void>::invoke(boost::detail::function::function_buffer&) (function_obj_ptr=...) at /usr/include/boost/function/function_template.hpp:158
#7  0x000055f96aa4538c in boost::function0<void>::operator()() const (this=0x55f96e2cdf98) at /usr/include/boost/function/function_template.hpp:763
#8  0x00007fca4c3dcad1 in PBD::Thread::_run(void*) (arg=0x55f96e2cdf70) at ../libs/pbd/pthread_utils.cc:488
#9  0x00007fca4bec8ea7 in start_thread (arg=<optimized out>) at pthread_create.c:477
#10 0x00007fca4aad3a2f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 31 (Thread 0x7fca28dea700 (LWP 479366)):
#0  syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:38
#1  0x00007fca4c3e2ab0 in PBD::Semaphore::wait() (this=0x55f96eb89174) at ../libs/pbd/semutils.cc:120
#2  0x00007fca4e2d3052 in ARDOUR::Graph::run_one() (this=0x55f96eb89040) at ../libs/ardour/graph.cc:320
#3  0x00007fca4e2d35f3 in ARDOUR::Graph::helper_thread() (this=0x55f96eb89040) at ../libs/ardour/graph.cc:372
#4  0x00007fca4e2de2e5 in boost::_mfi::mf0<void, ARDOUR::Graph>::operator()(ARDOUR::Graph*) const (this=0x7fca28de9928, p=0x55f96eb89040) at /usr/include/boost/bind/mem_fn_template.hpp:49
#5  0x00007fca4e2dd9c7 in boost::_bi::list1<boost::_bi::value<ARDOUR::Graph*> >::operator()<boost::_mfi::mf0<void, ARDOUR::Graph>, boost::_bi::list0>(boost::_bi::type<void>, boost::_mfi::mf0<void, ARDOUR::Graph>&, boost::_bi::list0&, int) (this=0x7fca28de9938, f=..., a=...) at /usr/include/boost/bind/bind.hpp:259
#6  0x00007fca4e2dcb31 in boost::_bi::bind_t<void, boost::_mfi::mf0<void, ARDOUR::Graph>, boost::_bi::list1<boost::_bi::value<ARDOUR::Graph*> > >::operator()() (this=0x7fca28de9928) at /usr/include/boost/bind/bind.hpp:1294
#7  0x00007fca4e2db5c6 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(boost::detail::function::function_buffer&) (function_obj_ptr=...) at /usr/include/boost/function/function_template.hpp:158
#8  0x000055f96aa4538c in boost::function0<void>::operator()() const (this=0x7fca28de9920) at /usr/include/boost/function/function_template.hpp:763
#9  0x00007fca363bbd8b in ARDOUR::JACKAudioBackend::_start_process_thread(void*) (arg=0x55f97168f5d0) at ../libs/backends/jack/jack_audiobackend.cc:970
#10 0x00007fca36e910ad in jack_thread_proxy (varg=0x55f97168f610) at thread.c:143
#11 0x00007fca4bec8ea7 in start_thread (arg=<optimized out>) at pthread_create.c:477
#12 0x00007fca4aad3a2f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 30 (Thread 0x7fca29354700 (LWP 479359)):
#0  syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:38
#1  0x00007fca4c3e2ab0 in PBD::Semaphore::wait() (this=0x55f96eb89174) at ../libs/pbd/semutils.cc:120
#2  0x00007fca4e2d3052 in ARDOUR::Graph::run_one() (this=0x55f96eb89040) at ../libs/ardour/graph.cc:320
#3  0x00007fca4e2d35f3 in ARDOUR::Graph::helper_thread() (this=0x55f96eb89040) at ../libs/ardour/graph.cc:372
#4  0x00007fca4e2de2e5 in boost::_mfi::mf0<void, ARDOUR::Graph>::operator()(ARDOUR::Graph*) const (this=0x7fca29353928, p=0x55f96eb89040) at /usr/include/boost/bind/mem_fn_template.hpp:49
#5  0x00007fca4e2dd9c7 in boost::_bi::list1<boost::_bi::value<ARDOUR::Graph*> >::operator()<boost::_mfi::mf0<void, ARDOUR::Graph>, boost::_bi::list0>(boost::_bi::type<void>, boost::_mfi::mf0--Type <RET> for more, q to quit, c to continue without paging--
<void, ARDOUR::Graph>&, boost::_bi::list0&, int) (this=0x7fca29353938, f=..., a=...) at /usr/include/boost/bind/bind.hpp:259
#6  0x00007fca4e2dcb31 in boost::_bi::bind_t<void, boost::_mfi::mf0<void, ARDOUR::Graph>, boost::_bi::list1<boost::_bi::value<ARDOUR::Graph*> > >::operator()() (this=0x7fca29353928) at /usr/include/boost/bind/bind.hpp:1294
#7  0x00007fca4e2db5c6 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(boost::detail::function::function_buffer&) (function_obj_ptr=...) at /usr/include/boost/function/function_template.hpp:158
#8  0x000055f96aa4538c in boost::function0<void>::operator()() const (this=0x7fca29353920) at /usr/include/boost/function/function_template.hpp:763
#9  0x00007fca363bbd8b in ARDOUR::JACKAudioBackend::_start_process_thread(void*) (arg=0x55f9716722e0) at ../libs/backends/jack/jack_audiobackend.cc:970
#10 0x00007fca36e910ad in jack_thread_proxy (varg=0x55f97168e480) at thread.c:143
#11 0x00007fca4bec8ea7 in start_thread (arg=<optimized out>) at pthread_create.c:477
#12 0x00007fca4aad3a2f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 29 (Thread 0x7fc987fff700 (LWP 479389)):
#0  syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:38
#1  0x00007fca4c22234f in g_cond_wait () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fca4f3f6afd in ArdourWaveView::WaveViewThreads::_dequeue_draw_request() (this=0x55f97634cbf0) at ../libs/waveview/wave_view_private.cc:323
#3  0x00007fca4f3f6a81 in ArdourWaveView::WaveViewThreads::dequeue_draw_request() () at ../libs/waveview/wave_view_private.cc:312
#4  0x00007fca4f3f6f81 in ArdourWaveView::WaveViewThreads::_thread_proc() (this=0x55f97634cbf0) at ../libs/waveview/wave_view_private.cc:501
#5  0x00007fca4f3f6f28 in ArdourWaveView::WaveViewThreads::thread_proc() () at ../libs/waveview/wave_view_private.cc:415
#6  0x00007fca4f3fab32 in boost::detail::function::void_function_invoker0<void (*)(), void>::invoke(boost::detail::function::function_buffer&) (function_ptr=...) at /usr/include/boost/function/function_template.hpp:117
#7  0x000055f96aa4538c in boost::function0<void>::operator()() const (this=0x55f97739cbd8) at /usr/include/boost/function/function_template.hpp:763
#8  0x00007fca4c3dcad1 in PBD::Thread::_run(void*) (arg=0x55f97739cbb0) at ../libs/pbd/pthread_utils.cc:488
#9  0x00007fca4bec8ea7 in start_thread (arg=<optimized out>) at pthread_create.c:477
#10 0x00007fca4aad3a2f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 28 (Thread 0x7fca28eec700 (LWP 479364)):
#0  syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:38
#1  0x00007fca4c3e2ab0 in PBD::Semaphore::wait() (this=0x55f96eb89174) at ../libs/pbd/semutils.cc:120
#2  0x00007fca4e2d3052 in ARDOUR::Graph::run_one() (this=0x55f96eb89040) at ../libs/ardour/graph.cc:320
#3  0x00007fca4e2d35f3 in ARDOUR::Graph::helper_thread() (this=0x55f96eb89040) at ../libs/ardour/graph.cc:372
#4  0x00007fca4e2de2e5 in boost::_mfi::mf0<void, ARDOUR::Graph>::operator()(ARDOUR::Graph*) const (this=0x7fca28eeb928, p=0x55f96eb89040) at /usr/include/boost/bind/mem_fn_template.hpp:49
#5  0x00007fca4e2dd9c7 in boost::_bi::list1<boost::_bi::value<ARDOUR::Graph*> >::operator()<boost::_mfi::mf0<void, ARDOUR::Graph>, boost::_bi::list0>(boost::_bi::type<void>, boost::_mfi::mf0<void, ARDOUR::Graph>&, boost::_bi::list0&, int) (this=0x7fca28eeb938, f=..., a=...) at /usr/include/boost/bind/bind.hpp:259
#6  0x00007fca4e2dcb31 in boost::_bi::bind_t<void, boost::_mfi::mf0<void, ARDOUR::Graph>, boost::_bi::list1<boost::_bi::value<ARDOUR::Graph*> > >::operator()() (this=0x7fca28eeb928) at /usr/include/boost/bind/bind.hpp:1294
#7  0x00007fca4e2db5c6 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(boost::detail::function::function_buffer&) (function_obj_ptr=...) at /usr/include/boost/function/function_template.hpp:158
#8  0x000055f96aa4538c in boost::function0<void>::operator()() const (this=0x7fca28eeb920) at /usr/include/boost/function/function_template.hpp:763
#9  0x00007fca363bbd8b in ARDOUR::JACKAudioBackend::_start_process_thread(void*) (arg=0x55f97168f0b0) at ../libs/backends/jack/jack_audiobackend.cc:970
#10 0x00007fca36e910ad in jack_thread_proxy (varg=0x55f97168f0f0) at thread.c:143
#11 0x00007fca4bec8ea7 in start_thread (arg=<optimized out>) at pthread_create.c:477
#12 0x00007fca4aad3a2f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 27 (Thread 0x7fc9b5ffb700 (LWP 479381)):
#0  0x00007fca4aa9a1a1 in __GI___clock_nanosleep (clock_id=clock_id@entry=0, flags=flags@entry=0, req=0x7fc9b5ffa810, rem=0x7fc9b5ffa820) at ../sysdeps/unix/sysv/linux/clock_nanosleep.c:48
#1  0x00007fca4aa9f983 in __GI___nanosleep (requested_time=<optimized out>, remaining=<optimized out>) at nanosleep.c:27
--Type <RET> for more, q to quit, c to continue without paging--
#2  0x00007fca4c1fbb4f in g_usleep () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fca4e17d0e2 in ARDOUR::AutomationWatch::thread() (this=0x55f974893540) at ../libs/ardour/automation_watch.cc:207
#4  0x00007fca4e1820dd in boost::_mfi::mf0<void, ARDOUR::AutomationWatch>::operator()(ARDOUR::AutomationWatch*) const (this=0x55f974b27390, p=0x55f974893540) at /usr/include/boost/bind/mem_fn_template.hpp:49
#5  0x00007fca4e181d3d in boost::_bi::list1<boost::_bi::value<ARDOUR::AutomationWatch*> >::operator()<boost::_mfi::mf0<void, ARDOUR::AutomationWatch>, boost::_bi::list0>(boost::_bi::type<void>, boost::_mfi::mf0<void, ARDOUR::AutomationWatch>&, boost::_bi::list0&, int) (this=0x55f974b273a0, f=..., a=...) at /usr/include/boost/bind/bind.hpp:259
#6  0x00007fca4e18167f in boost::_bi::bind_t<void, boost::_mfi::mf0<void, ARDOUR::AutomationWatch>, boost::_bi::list1<boost::_bi::value<ARDOUR::AutomationWatch*> > >::operator()() (this=0x55f974b27390) at /usr/include/boost/bind/bind.hpp:1294
#7  0x00007fca4e181204 in boost::detail::function::void_function_obj_invoker0<boost::_bi::bind_t<void, boost::_mfi::mf0<void, ARDOUR::AutomationWatch>, boost::_bi::list1<boost::_bi::value<ARDOUR::AutomationWatch*> > >, void>::invoke(boost::detail::function::function_buffer&) (function_obj_ptr=...) at /usr/include/boost/function/function_template.hpp:158
#8  0x000055f96aa4538c in boost::function0<void>::operator()() const (this=0x55f974b27388) at /usr/include/boost/function/function_template.hpp:763
#9  0x00007fca4c3dcad1 in PBD::Thread::_run(void*) (arg=0x55f974b27360) at ../libs/pbd/pthread_utils.cc:488
#10 0x00007fca4bec8ea7 in start_thread (arg=<optimized out>) at pthread_create.c:477
#11 0x00007fca4aad3a2f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 26 (Thread 0x7fca28379700 (LWP 479370)):
#0  syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:38
#1  0x00007fca4c3e2ab0 in PBD::Semaphore::wait() (this=0x55f96eb89174) at ../libs/pbd/semutils.cc:120
#2  0x00007fca4e2d3052 in ARDOUR::Graph::run_one() (this=0x55f96eb89040) at ../libs/ardour/graph.cc:320
#3  0x00007fca4e2d35f3 in ARDOUR::Graph::helper_thread() (this=0x55f96eb89040) at ../libs/ardour/graph.cc:372
#4  0x00007fca4e2de2e5 in boost::_mfi::mf0<void, ARDOUR::Graph>::operator()(ARDOUR::Graph*) const (this=0x7fca28378928, p=0x55f96eb89040) at /usr/include/boost/bind/mem_fn_template.hpp:49
#5  0x00007fca4e2dd9c7 in boost::_bi::list1<boost::_bi::value<ARDOUR::Graph*> >::operator()<boost::_mfi::mf0<void, ARDOUR::Graph>, boost::_bi::list0>(boost::_bi::type<void>, boost::_mfi::mf0<void, ARDOUR::Graph>&, boost::_bi::list0&, int) (this=0x7fca28378938, f=..., a=...) at /usr/include/boost/bind/bind.hpp:259
#6  0x00007fca4e2dcb31 in boost::_bi::bind_t<void, boost::_mfi::mf0<void, ARDOUR::Graph>, boost::_bi::list1<boost::_bi::value<ARDOUR::Graph*> > >::operator()() (this=0x7fca28378928) at /usr/include/boost/bind/bind.hpp:1294
#7  0x00007fca4e2db5c6 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(boost::detail::function::function_buffer&) (function_obj_ptr=...) at /usr/include/boost/function/function_template.hpp:158
#8  0x000055f96aa4538c in boost::function0<void>::operator()() const (this=0x7fca28378920) at /usr/include/boost/function/function_template.hpp:763
#9  0x00007fca363bbd8b in ARDOUR::JACKAudioBackend::_start_process_thread(void*) (arg=0x55f971690010) at ../libs/backends/jack/jack_audiobackend.cc:970
#10 0x00007fca36e910ad in jack_thread_proxy (varg=0x55f971690050) at thread.c:143
#11 0x00007fca4bec8ea7 in start_thread (arg=<optimized out>) at pthread_create.c:477
#12 0x00007fca4aad3a2f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 25 (Thread 0x7fc9a0ff9700 (LWP 479388)):
#0  syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:38
#1  0x00007fca4c22234f in g_cond_wait () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fca4f3f6afd in ArdourWaveView::WaveViewThreads::_dequeue_draw_request() (this=0x55f97634cbf0) at ../libs/waveview/wave_view_private.cc:323
#3  0x00007fca4f3f6a81 in ArdourWaveView::WaveViewThreads::dequeue_draw_request() () at ../libs/waveview/wave_view_private.cc:312
#4  0x00007fca4f3f6f81 in ArdourWaveView::WaveViewThreads::_thread_proc() (this=0x55f97634cbf0) at ../libs/waveview/wave_view_private.cc:501
#5  0x00007fca4f3f6f28 in ArdourWaveView::WaveViewThreads::thread_proc() () at ../libs/waveview/wave_view_private.cc:415
#6  0x00007fca4f3fab32 in boost::detail::function::void_function_invoker0<void (*)(), void>::invoke(boost::detail::function::function_buffer&) (function_ptr=...) at /usr/include/boost/function/function_template.hpp:117
#7  0x000055f96aa4538c in boost::function0<void>::operator()() const (this=0x55f97739c958) at /usr/include/boost/function/function_template.hpp:763
#8  0x00007fca4c3dcad1 in PBD::Thread::_run(void*) (arg=0x55f97739c930) at ../libs/pbd/pthread_utils.cc:488
#9  0x00007fca4bec8ea7 in start_thread (arg=<optimized out>) at pthread_create.c:477
#10 0x00007fca4aad3a2f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95
--Type <RET> for more, q to quit, c to continue without paging--

Thread 24 (Thread 0x7fc9a1ffb700 (LWP 479386)):
#0  syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:38
#1  0x00007fca4c22234f in g_cond_wait () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fca4f3f6afd in ArdourWaveView::WaveViewThreads::_dequeue_draw_request() (this=0x55f97634cbf0) at ../libs/waveview/wave_view_private.cc:323
#3  0x00007fca4f3f6a81 in ArdourWaveView::WaveViewThreads::dequeue_draw_request() () at ../libs/waveview/wave_view_private.cc:312
#4  0x00007fca4f3f6f81 in ArdourWaveView::WaveViewThreads::_thread_proc() (this=0x55f97634cbf0) at ../libs/waveview/wave_view_private.cc:501
#5  0x00007fca4f3f6f28 in ArdourWaveView::WaveViewThreads::thread_proc() () at ../libs/waveview/wave_view_private.cc:415
#6  0x00007fca4f3fab32 in boost::detail::function::void_function_invoker0<void (*)(), void>::invoke(boost::detail::function::function_buffer&) (function_ptr=...) at /usr/include/boost/function/function_template.hpp:117
#7  0x000055f96aa4538c in boost::function0<void>::operator()() const (this=0x55f97739c458) at /usr/include/boost/function/function_template.hpp:763
#8  0x00007fca4c3dcad1 in PBD::Thread::_run(void*) (arg=0x55f97739c430) at ../libs/pbd/pthread_utils.cc:488
#9  0x00007fca4bec8ea7 in start_thread (arg=<optimized out>) at pthread_create.c:477
#10 0x00007fca4aad3a2f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 23 (Thread 0x7fca292d3700 (LWP 479360)):
#0  syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:38
#1  0x00007fca4c3e2ab0 in PBD::Semaphore::wait() (this=0x55f96eb89174) at ../libs/pbd/semutils.cc:120
#2  0x00007fca4e2d3052 in ARDOUR::Graph::run_one() (this=0x55f96eb89040) at ../libs/ardour/graph.cc:320
#3  0x00007fca4e2d35f3 in ARDOUR::Graph::helper_thread() (this=0x55f96eb89040) at ../libs/ardour/graph.cc:372
#4  0x00007fca4e2de2e5 in boost::_mfi::mf0<void, ARDOUR::Graph>::operator()(ARDOUR::Graph*) const (this=0x7fca292d2928, p=0x55f96eb89040) at /usr/include/boost/bind/mem_fn_template.hpp:49
#5  0x00007fca4e2dd9c7 in boost::_bi::list1<boost::_bi::value<ARDOUR::Graph*> >::operator()<boost::_mfi::mf0<void, ARDOUR::Graph>, boost::_bi::list0>(boost::_bi::type<void>, boost::_mfi::mf0<void, ARDOUR::Graph>&, boost::_bi::list0&, int) (this=0x7fca292d2938, f=..., a=...) at /usr/include/boost/bind/bind.hpp:259
#6  0x00007fca4e2dcb31 in boost::_bi::bind_t<void, boost::_mfi::mf0<void, ARDOUR::Graph>, boost::_bi::list1<boost::_bi::value<ARDOUR::Graph*> > >::operator()() (this=0x7fca292d2928) at /usr/include/boost/bind/bind.hpp:1294
#7  0x00007fca4e2db5c6 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(boost::detail::function::function_buffer&) (function_obj_ptr=...) at /usr/include/boost/function/function_template.hpp:158
#8  0x000055f96aa4538c in boost::function0<void>::operator()() const (this=0x7fca292d2920) at /usr/include/boost/function/function_template.hpp:763
#9  0x00007fca363bbd8b in ARDOUR::JACKAudioBackend::_start_process_thread(void*) (arg=0x55f9716722a0) at ../libs/backends/jack/jack_audiobackend.cc:970
#10 0x00007fca36e910ad in jack_thread_proxy (varg=0x55f97168e6d0) at thread.c:143
#11 0x00007fca4bec8ea7 in start_thread (arg=<optimized out>) at pthread_create.c:477
#12 0x00007fca4aad3a2f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 22 (Thread 0x7fc9a37fe700 (LWP 479383)):
#0  syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:38
#1  0x00007fca4c22234f in g_cond_wait () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fca4f3f6afd in ArdourWaveView::WaveViewThreads::_dequeue_draw_request() (this=0x55f97634cbf0) at ../libs/waveview/wave_view_private.cc:323
#3  0x00007fca4f3f6a81 in ArdourWaveView::WaveViewThreads::dequeue_draw_request() () at ../libs/waveview/wave_view_private.cc:312
#4  0x00007fca4f3f6f81 in ArdourWaveView::WaveViewThreads::_thread_proc() (this=0x55f97634cbf0) at ../libs/waveview/wave_view_private.cc:501
#5  0x00007fca4f3f6f28 in ArdourWaveView::WaveViewThreads::thread_proc() () at ../libs/waveview/wave_view_private.cc:415
#6  0x00007fca4f3fab32 in boost::detail::function::void_function_invoker0<void (*)(), void>::invoke(boost::detail::function::function_buffer&) (function_ptr=...) at /usr/include/boost/function/function_template.hpp:117
#7  0x000055f96aa4538c in boost::function0<void>::operator()() const (this=0x55f9773a3258) at /usr/include/boost/function/function_template.hpp:763
#8  0x00007fca4c3dcad1 in PBD::Thread::_run(void*) (arg=0x55f9773a3230) at ../libs/pbd/pthread_utils.cc:488
#9  0x00007fca4bec8ea7 in start_thread (arg=<optimized out>) at pthread_create.c:477
#10 0x00007fca4aad3a2f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95
--Type <RET> for more, q to quit, c to continue without paging--c

Thread 21 (Thread 0x7fc9b6ffd700 (LWP 479379)):
#0  futex_wait_cancelable (private=0, expected=0, futex_word=0x55f972607eb0) at ../sysdeps/nptl/futex-internal.h:186
#1  __pthread_cond_wait_common (abstime=0x0, clockid=0, mutex=0x55f972607e60, cond=0x55f972607e88) at pthread_cond_wait.c:508
#2  __pthread_cond_wait (cond=0x55f972607e88, mutex=0x55f972607e60) at pthread_cond_wait.c:638
#3  0x00007fca4e6d4ecb in ARDOUR::Session::emit_thread_run() (this=0x55f972605d20) at ../libs/ardour/session_process.cc:1241
#4  0x00007fca4e6d4e68 in ARDOUR::Session::emit_thread(void*) (arg=0x55f972605d20) at ../libs/ardour/session_process.cc:1230
#5  0x00007fca4bec8ea7 in start_thread (arg=<optimized out>) at pthread_create.c:477
#6  0x00007fca4aad3a2f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 20 (Thread 0x7fc9b77fe700 (LWP 479378)):
#0  0x00007fca4aac796f in __GI___poll (fds=0x7fc9ac000b60, nfds=2, timeout=60000) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007fca4b4e36e8 in  () at /lib/x86_64-linux-gnu/libusb-1.0.so.0
#2  0x00007fca4b4e1129 in  () at /lib/x86_64-linux-gnu/libusb-1.0.so.0
#3  0x00007fca4b4e22c7 in libusb_handle_events_timeout_completed () at /lib/x86_64-linux-gnu/libusb-1.0.so.0
#4  0x00007fca4b4e232f in libusb_handle_events () at /lib/x86_64-linux-gnu/libusb-1.0.so.0
#5  0x00007fca4e1a9c1c in usb_hotplug_thread(void*) (user_data=0x55f96db18e60) at ../libs/ardour/control_protocol_manager.cc:87
#6  0x00007fca4bec8ea7 in start_thread (arg=<optimized out>) at pthread_create.c:477
#7  0x00007fca4aad3a2f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 19 (Thread 0x7fc9a3fff700 (LWP 479382)):
#0  syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:38
#1  0x00007fca4c22234f in g_cond_wait () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fca4f3f6afd in ArdourWaveView::WaveViewThreads::_dequeue_draw_request() (this=0x55f97634cbf0) at ../libs/waveview/wave_view_private.cc:323
#3  0x00007fca4f3f6a81 in ArdourWaveView::WaveViewThreads::dequeue_draw_request() () at ../libs/waveview/wave_view_private.cc:312
#4  0x00007fca4f3f6f81 in ArdourWaveView::WaveViewThreads::_thread_proc() (this=0x55f97634cbf0) at ../libs/waveview/wave_view_private.cc:501
#5  0x00007fca4f3f6f28 in ArdourWaveView::WaveViewThreads::thread_proc() () at ../libs/waveview/wave_view_private.cc:415
#6  0x00007fca4f3fab32 in boost::detail::function::void_function_invoker0<void (*)(), void>::invoke(boost::detail::function::function_buffer&) (function_ptr=...) at /usr/include/boost/function/function_template.hpp:117
#7  0x000055f96aa4538c in boost::function0<void>::operator()() const (this=0x55f974baf2a8) at /usr/include/boost/function/function_template.hpp:763
#8  0x00007fca4c3dcad1 in PBD::Thread::_run(void*) (arg=0x55f974baf280) at ../libs/pbd/pthread_utils.cc:488
#9  0x00007fca4bec8ea7 in start_thread (arg=<optimized out>) at pthread_create.c:477
#10 0x00007fca4aad3a2f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 18 (Thread 0x7fc9b7fff700 (LWP 479377)):
#0  0x00007fca4aac796f in __GI___poll (fds=0x7fc9b7ffe980, nfds=2, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007fca4b4e86d2 in  () at /lib/x86_64-linux-gnu/libusb-1.0.so.0
#2  0x00007fca4bec8ea7 in start_thread (arg=<optimized out>) at pthread_create.c:477
#3  0x00007fca4aad3a2f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 17 (Thread 0x7fca08ff9700 (LWP 479375)):
#0  syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:38
#1  0x00007fca4c3e2ab0 in PBD::Semaphore::wait() (this=0x55f9708561e0) at ../libs/pbd/semutils.cc:120
#2  0x00007fca4e819f5c in ARDOUR::Worker::run() (this=0x55f9708561c0) at ../libs/ardour/worker.cc:145
#3  0x00007fca4e81b259 in boost::_mfi::mf0<void, ARDOUR::Worker>::operator()(ARDOUR::Worker*) const (this=0x55f9708560b0, p=0x55f9708561c0) at /usr/include/boost/bind/mem_fn_template.hpp:49
#4  0x00007fca4e81b07f in boost::_bi::list1<boost::_bi::value<ARDOUR::Worker*> >::operator()<boost::_mfi::mf0<void, ARDOUR::Worker>, boost::_bi::list0>(boost::_bi::type<void>, boost::_mfi::mf0<void, ARDOUR::Worker>&, boost::_bi::list0&, int) (this=0x55f9708560c0, f=..., a=...) at /usr/include/boost/bind/bind.hpp:259
#5  0x00007fca4e81af7f in boost::_bi::bind_t<void, boost::_mfi::mf0<void, ARDOUR::Worker>, boost::_bi::list1<boost::_bi::value<ARDOUR::Worker*> > >::operator()() (this=0x55f9708560b0) at /usr/include/boost/bind/bind.hpp:1294
#6  0x00007fca4e81aed8 in boost::detail::function::void_function_obj_invoker0<boost::_bi::bind_t<void, boost::_mfi::mf0<void, ARDOUR::Worker>, boost::_bi::list1<boost::_bi::value<ARDOUR::Worker*> > >, void>::invoke(boost::detail::function::function_buffer&) (function_obj_ptr=...) at /usr/include/boost/function/function_template.hpp:158
#7  0x000055f96aa4538c in boost::function0<void>::operator()() const (this=0x55f9708560a8) at /usr/include/boost/function/function_template.hpp:763
#8  0x00007fca4c3dcad1 in PBD::Thread::_run(void*) (arg=0x55f970856080) at ../libs/pbd/pthread_utils.cc:488
#9  0x00007fca4bec8ea7 in start_thread (arg=<optimized out>) at pthread_create.c:477
#10 0x00007fca4aad3a2f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 16 (Thread 0x7fca467fd700 (LWP 479271)):
#0  0x00007fca4aac796f in __GI___poll (fds=0x7fca467fc844, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007fca4c3b7106 in CrossThreadChannel::poll_for_request() (this=0x55f96db6b530) at ../libs/pbd/crossthread.posix.cc:108
#2  0x00007fca4c3b7177 in CrossThreadChannel::receive(char&, bool) (this=0x55f96db6b530, msg=@0x7fca467fc8af: 0 '\000', wait=true) at ../libs/pbd/crossthread.posix.cc:133
#3  0x00007fca4e7e77df in ARDOUR::TriggerBoxThread::thread_work() (this=0x55f96db6b500) at ../libs/ardour/triggerbox.cc:4880
#4  0x00007fca4e7e7777 in ARDOUR::TriggerBoxThread::_thread_work(void*) (arg=0x55f96db6b500) at ../libs/ardour/triggerbox.cc:4868
#5  0x00007fca4c3dc052 in fake_thread_start(void*) (arg=0x55f96db69b50) at ../libs/pbd/pthread_utils.cc:101
#6  0x00007fca4bec8ea7 in start_thread (arg=<optimized out>) at pthread_create.c:477
#7  0x00007fca4aad3a2f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 15 (Thread 0x7fca35e02700 (LWP 479278)):
#0  syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:38
#1  0x00007fca4c22234f in g_cond_wait () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fca4e110859 in ARDOUR::AudioEngine::do_reset_backend() (this=0x55f96e2b0a00) at ../libs/ardour/audioengine.cc:724
#3  0x00007fca4e11efa9 in boost::_mfi::mf0<void, ARDOUR::AudioEngine>::operator()(ARDOUR::AudioEngine*) const (this=0x55f96e2bf8c0, p=0x55f96e2b0a00) at /usr/include/boost/bind/mem_fn_template.hpp:49
#4  0x00007fca4e11e58d in boost::_bi::list1<boost::_bi::value<ARDOUR::AudioEngine*> >::operator()<boost::_mfi::mf0<void, ARDOUR::AudioEngine>, boost::_bi::list0>(boost::_bi::type<void>, boost::_mfi::mf0<void, ARDOUR::AudioEngine>&, boost::_bi::list0&, int) (this=0x55f96e2bf8d0, f=..., a=...) at /usr/include/boost/bind/bind.hpp:259
#5  0x00007fca4e11dbe9 in boost::_bi::bind_t<void, boost::_mfi::mf0<void, ARDOUR::AudioEngine>, boost::_bi::list1<boost::_bi::value<ARDOUR::AudioEngine*> > >::operator()() (this=0x55f96e2bf8c0) at /usr/include/boost/bind/bind.hpp:1294
#6  0x00007fca4e11d077 in boost::detail::function::void_function_obj_invoker0<boost::_bi::bind_t<void, boost::_mfi::mf0<void, ARDOUR::AudioEngine>, boost::_bi::list1<boost::_bi::value<ARDOUR::AudioEngine*> > >, void>::invoke(boost::detail::function::function_buffer&) (function_obj_ptr=...) at /usr/include/boost/function/function_template.hpp:158
#7  0x000055f96aa4538c in boost::function0<void>::operator()() const (this=0x55f96e2bf8b8) at /usr/include/boost/function/function_template.hpp:763
#8  0x00007fca4c3dcad1 in PBD::Thread::_run(void*) (arg=0x55f96e2bf890) at ../libs/pbd/pthread_utils.cc:488
#9  0x00007fca4bec8ea7 in start_thread (arg=<optimized out>) at pthread_create.c:477
#10 0x00007fca4aad3a2f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 14 (Thread 0x7fca28bfb700 (LWP 479374)):
#0  syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:38
#1  0x00007fca4c3e2ab0 in PBD::Semaphore::wait() (this=0x55f9727cf1d0) at ../libs/pbd/semutils.cc:120
#2  0x00007fca4e819f5c in ARDOUR::Worker::run() (this=0x55f9727cf1b0) at ../libs/ardour/worker.cc:145
#3  0x00007fca4e81b259 in boost::_mfi::mf0<void, ARDOUR::Worker>::operator()(ARDOUR::Worker*) const (this=0x55f9727cf4c0, p=0x55f9727cf1b0) at /usr/include/boost/bind/mem_fn_template.hpp:49
#4  0x00007fca4e81b07f in boost::_bi::list1<boost::_bi::value<ARDOUR::Worker*> >::operator()<boost::_mfi::mf0<void, ARDOUR::Worker>, boost::_bi::list0>(boost::_bi::type<void>, boost::_mfi::mf0<void, ARDOUR::Worker>&, boost::_bi::list0&, int) (this=0x55f9727cf4d0, f=..., a=...) at /usr/include/boost/bind/bind.hpp:259
#5  0x00007fca4e81af7f in boost::_bi::bind_t<void, boost::_mfi::mf0<void, ARDOUR::Worker>, boost::_bi::list1<boost::_bi::value<ARDOUR::Worker*> > >::operator()() (this=0x55f9727cf4c0) at /usr/include/boost/bind/bind.hpp:1294
#6  0x00007fca4e81aed8 in boost::detail::function::void_function_obj_invoker0<boost::_bi::bind_t<void, boost::_mfi::mf0<void, ARDOUR::Worker>, boost::_bi::list1<boost::_bi::value<ARDOUR::Worker*> > >, void>::invoke(boost::detail::function::function_buffer&) (function_obj_ptr=...) at /usr/include/boost/function/function_template.hpp:158
#7  0x000055f96aa4538c in boost::function0<void>::operator()() const (this=0x55f9727cf4b8) at /usr/include/boost/function/function_template.hpp:763
#8  0x00007fca4c3dcad1 in PBD::Thread::_run(void*) (arg=0x55f9727cf490) at ../libs/pbd/pthread_utils.cc:488
#9  0x00007fca4bec8ea7 in start_thread (arg=<optimized out>) at pthread_create.c:477
#10 0x00007fca4aad3a2f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 13 (Thread 0x7fca0affd700 (LWP 479373)):
#0  syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:38
#1  0x00007fca4c3e2ab0 in PBD::Semaphore::wait() (this=0x55f972ab10b0) at ../libs/pbd/semutils.cc:120
#2  0x00007fca4e819f5c in ARDOUR::Worker::run() (this=0x55f972ab1090) at ../libs/ardour/worker.cc:145
#3  0x00007fca4e81b259 in boost::_mfi::mf0<void, ARDOUR::Worker>::operator()(ARDOUR::Worker*) const (this=0x55f972ab3370, p=0x55f972ab1090) at /usr/include/boost/bind/mem_fn_template.hpp:49
#4  0x00007fca4e81b07f in boost::_bi::list1<boost::_bi::value<ARDOUR::Worker*> >::operator()<boost::_mfi::mf0<void, ARDOUR::Worker>, boost::_bi::list0>(boost::_bi::type<void>, boost::_mfi::mf0<void, ARDOUR::Worker>&, boost::_bi::list0&, int) (this=0x55f972ab3380, f=..., a=...) at /usr/include/boost/bind/bind.hpp:259
#5  0x00007fca4e81af7f in boost::_bi::bind_t<void, boost::_mfi::mf0<void, ARDOUR::Worker>, boost::_bi::list1<boost::_bi::value<ARDOUR::Worker*> > >::operator()() (this=0x55f972ab3370) at /usr/include/boost/bind/bind.hpp:1294
#6  0x00007fca4e81aed8 in boost::detail::function::void_function_obj_invoker0<boost::_bi::bind_t<void, boost::_mfi::mf0<void, ARDOUR::Worker>, boost::_bi::list1<boost::_bi::value<ARDOUR::Worker*> > >, void>::invoke(boost::detail::function::function_buffer&) (function_obj_ptr=...) at /usr/include/boost/function/function_template.hpp:158
#7  0x000055f96aa4538c in boost::function0<void>::operator()() const (this=0x55f972ab3368) at /usr/include/boost/function/function_template.hpp:763
#8  0x00007fca4c3dcad1 in PBD::Thread::_run(void*) (arg=0x55f972ab3340) at ../libs/pbd/pthread_utils.cc:488
#9  0x00007fca4bec8ea7 in start_thread (arg=<optimized out>) at pthread_create.c:477
#10 0x00007fca4aad3a2f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 12 (Thread 0x7fca28e6b700 (LWP 479365)):
#0  syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:38
#1  0x00007fca4c3e2ab0 in PBD::Semaphore::wait() (this=0x55f96eb89174) at ../libs/pbd/semutils.cc:120
#2  0x00007fca4e2d3052 in ARDOUR::Graph::run_one() (this=0x55f96eb89040) at ../libs/ardour/graph.cc:320
#3  0x00007fca4e2d35f3 in ARDOUR::Graph::helper_thread() (this=0x55f96eb89040) at ../libs/ardour/graph.cc:372
#4  0x00007fca4e2de2e5 in boost::_mfi::mf0<void, ARDOUR::Graph>::operator()(ARDOUR::Graph*) const (this=0x7fca28e6a928, p=0x55f96eb89040) at /usr/include/boost/bind/mem_fn_template.hpp:49
#5  0x00007fca4e2dd9c7 in boost::_bi::list1<boost::_bi::value<ARDOUR::Graph*> >::operator()<boost::_mfi::mf0<void, ARDOUR::Graph>, boost::_bi::list0>(boost::_bi::type<void>, boost::_mfi::mf0<void, ARDOUR::Graph>&, boost::_bi::list0&, int) (this=0x7fca28e6a938, f=..., a=...) at /usr/include/boost/bind/bind.hpp:259
#6  0x00007fca4e2dcb31 in boost::_bi::bind_t<void, boost::_mfi::mf0<void, ARDOUR::Graph>, boost::_bi::list1<boost::_bi::value<ARDOUR::Graph*> > >::operator()() (this=0x7fca28e6a928) at /usr/include/boost/bind/bind.hpp:1294
#7  0x00007fca4e2db5c6 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(boost::detail::function::function_buffer&) (function_obj_ptr=...) at /usr/include/boost/function/function_template.hpp:158
#8  0x000055f96aa4538c in boost::function0<void>::operator()() const (this=0x7fca28e6a920) at /usr/include/boost/function/function_template.hpp:763
#9  0x00007fca363bbd8b in ARDOUR::JACKAudioBackend::_start_process_thread(void*) (arg=0x55f97168f340) at ../libs/backends/jack/jack_audiobackend.cc:970
#10 0x00007fca36e910ad in jack_thread_proxy (varg=0x55f97168f380) at thread.c:143
#11 0x00007fca4bec8ea7 in start_thread (arg=<optimized out>) at pthread_create.c:477
#12 0x00007fca4aad3a2f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 11 (Thread 0x7fca29bfd700 (LWP 479312)):
#0  0x00007fca4aac796f in __GI___poll (fds=0x55f96ed2d030, nfds=2, timeout=1000) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007fca36e89b23 in jack_client_core_wait (client=0x55f96ed67000) at client.c:2103
#2  0x00007fca36e89e59 in jack_cycle_wait (client=0x55f96ed67000) at client.c:2286
#3  0x00007fca363bbe4f in ARDOUR::JACKAudioBackend::process_thread() (this=0x55f96e3951f0) at ../libs/backends/jack/jack_audiobackend.cc:999
#4  0x00007fca363bbdda in ARDOUR::JACKAudioBackend::_process_thread(void*) (arg=0x55f96e3951f0) at ../libs/backends/jack/jack_audiobackend.cc:978
#5  0x00007fca36e89d30 in jack_process_thread_work (arg=0x55f96ed67000) at client.c:2216
#6  0x00007fca36e910ad in jack_thread_proxy (varg=0x55f96e382e90) at thread.c:143
#7  0x00007fca4bec8ea7 in start_thread (arg=<optimized out>) at pthread_create.c:477
#8  0x00007fca4aad3a2f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 10 (Thread 0x7fca29252700 (LWP 479361)):
#0  syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:38
#1  0x00007fca4c3e2ab0 in PBD::Semaphore::wait() (this=0x55f96eb89174) at ../libs/pbd/semutils.cc:120
#2  0x00007fca4e2d3052 in ARDOUR::Graph::run_one() (this=0x55f96eb89040) at ../libs/ardour/graph.cc:320
#3  0x00007fca4e2d35f3 in ARDOUR::Graph::helper_thread() (this=0x55f96eb89040) at ../libs/ardour/graph.cc:372
#4  0x00007fca4e2de2e5 in boost::_mfi::mf0<void, ARDOUR::Graph>::operator()(ARDOUR::Graph*) const (this=0x7fca29251928, p=0x55f96eb89040) at /usr/include/boost/bind/mem_fn_template.hpp:49
#5  0x00007fca4e2dd9c7 in boost::_bi::list1<boost::_bi::value<ARDOUR::Graph*> >::operator()<boost::_mfi::mf0<void, ARDOUR::Graph>, boost::_bi::list0>(boost::_bi::type<void>, boost::_mfi::mf0<void, ARDOUR::Graph>&, boost::_bi::list0&, int) (this=0x7fca29251938, f=..., a=...) at /usr/include/boost/bind/bind.hpp:259
#6  0x00007fca4e2dcb31 in boost::_bi::bind_t<void, boost::_mfi::mf0<void, ARDOUR::Graph>, boost::_bi::list1<boost::_bi::value<ARDOUR::Graph*> > >::operator()() (this=0x7fca29251928) at /usr/include/boost/bind/bind.hpp:1294
#7  0x00007fca4e2db5c6 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(boost::detail::function::function_buffer&) (function_obj_ptr=...) at /usr/include/boost/function/function_template.hpp:158
#8  0x000055f96aa4538c in boost::function0<void>::operator()() const (this=0x7fca29251920) at /usr/include/boost/function/function_template.hpp:763
#9  0x00007fca363bbd8b in ARDOUR::JACKAudioBackend::_start_process_thread(void*) (arg=0x55f9717fcdc0) at ../libs/backends/jack/jack_audiobackend.cc:970
#10 0x00007fca36e910ad in jack_thread_proxy (varg=0x55f97168e450) at thread.c:143
#11 0x00007fca4bec8ea7 in start_thread (arg=<optimized out>) at pthread_create.c:477
#12 0x00007fca4aad3a2f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 9 (Thread 0x7fca293d5700 (LWP 479358)):
#0  syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:38
#1  0x00007fca4c3e2ab0 in PBD::Semaphore::wait() (this=0x55f96eb89174) at ../libs/pbd/semutils.cc:120
#2  0x00007fca4e2d3052 in ARDOUR::Graph::run_one() (this=0x55f96eb89040) at ../libs/ardour/graph.cc:320
#3  0x00007fca4e2d35f3 in ARDOUR::Graph::helper_thread() (this=0x55f96eb89040) at ../libs/ardour/graph.cc:372
#4  0x00007fca4e2de2e5 in boost::_mfi::mf0<void, ARDOUR::Graph>::operator()(ARDOUR::Graph*) const (this=0x7fca293d4928, p=0x55f96eb89040) at /usr/include/boost/bind/mem_fn_template.hpp:49
#5  0x00007fca4e2dd9c7 in boost::_bi::list1<boost::_bi::value<ARDOUR::Graph*> >::operator()<boost::_mfi::mf0<void, ARDOUR::Graph>, boost::_bi::list0>(boost::_bi::type<void>, boost::_mfi::mf0<void, ARDOUR::Graph>&, boost::_bi::list0&, int) (this=0x7fca293d4938, f=..., a=...) at /usr/include/boost/bind/bind.hpp:259
#6  0x00007fca4e2dcb31 in boost::_bi::bind_t<void, boost::_mfi::mf0<void, ARDOUR::Graph>, boost::_bi::list1<boost::_bi::value<ARDOUR::Graph*> > >::operator()() (this=0x7fca293d4928) at /usr/include/boost/bind/bind.hpp:1294
#7  0x00007fca4e2db5c6 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(boost::detail::function::function_buffer&) (function_obj_ptr=...) at /usr/include/boost/function/function_template.hpp:158
#8  0x000055f96aa4538c in boost::function0<void>::operator()() const (this=0x7fca293d4920) at /usr/include/boost/function/function_template.hpp:763
#9  0x00007fca363bbd8b in ARDOUR::JACKAudioBackend::_start_process_thread(void*) (arg=0x55f9716723a0) at ../libs/backends/jack/jack_audiobackend.cc:970
#10 0x00007fca36e910ad in jack_thread_proxy (varg=0x55f97168e200) at thread.c:143
#11 0x00007fca4bec8ea7 in start_thread (arg=<optimized out>) at pthread_create.c:477
#12 0x00007fca4aad3a2f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 8 (Thread 0x7fca28d69700 (LWP 479367)):
#0  syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:38
#1  0x00007fca4c3e2ab0 in PBD::Semaphore::wait() (this=0x55f96eb89180) at ../libs/pbd/semutils.cc:120
#2  0x00007fca4e2d2a76 in ARDOUR::Graph::reached_terminal_node() (this=0x55f96eb89040) at ../libs/ardour/graph.cc:267
#3  0x00007fca4e2ded55 in ARDOUR::GraphNode::finish(ARDOUR::GraphChain const*) (this=0x55f972c36340, chain=0x55f974a95b70) at ../libs/ardour/graphnode.cc:101
#4  0x00007fca4e2dec3a in ARDOUR::GraphNode::run(ARDOUR::GraphChain const*) (this=0x55f972c36340, chain=0x55f974a95b70) at ../libs/ardour/graphnode.cc:68
#5  0x00007fca4e2d3209 in ARDOUR::Graph::run_one() (this=0x55f96eb89040) at ../libs/ardour/graph.cc:344
#6  0x00007fca4e2d35f3 in ARDOUR::Graph::helper_thread() (this=0x55f96eb89040) at ../libs/ardour/graph.cc:372
#7  0x00007fca4e2de2e5 in boost::_mfi::mf0<void, ARDOUR::Graph>::operator()(ARDOUR::Graph*) const (this=0x7fca28d68928, p=0x55f96eb89040) at /usr/include/boost/bind/mem_fn_template.hpp:49
#8  0x00007fca4e2dd9c7 in boost::_bi::list1<boost::_bi::value<ARDOUR::Graph*> >::operator()<boost::_mfi::mf0<void, ARDOUR::Graph>, boost::_bi::list0>(boost::_bi::type<void>, boost::_mfi::mf0<void, ARDOUR::Graph>&, boost::_bi::list0&, int) (this=0x7fca28d68938, f=..., a=...) at /usr/include/boost/bind/bind.hpp:259
#9  0x00007fca4e2dcb31 in boost::_bi::bind_t<void, boost::_mfi::mf0<void, ARDOUR::Graph>, boost::_bi::list1<boost::_bi::value<ARDOUR::Graph*> > >::operator()() (this=0x7fca28d68928) at /usr/include/boost/bind/bind.hpp:1294
#10 0x00007fca4e2db5c6 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(boost::detail::function::function_buffer&) (function_obj_ptr=...) at /usr/include/boost/function/function_template.hpp:158
#11 0x000055f96aa4538c in boost::function0<void>::operator()() const (this=0x7fca28d68920) at /usr/include/boost/function/function_template.hpp:763
#12 0x00007fca363bbd8b in ARDOUR::JACKAudioBackend::_start_process_thread(void*) (arg=0x55f97168f860) at ../libs/backends/jack/jack_audiobackend.cc:970
#13 0x00007fca36e910ad in jack_thread_proxy (varg=0x55f97168f8a0) at thread.c:143
#14 0x00007fca4bec8ea7 in start_thread (arg=<optimized out>) at pthread_create.c:477
#15 0x00007fca4aad3a2f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 7 (Thread 0x7fca283fa700 (LWP 479369)):
#0  syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:38
#1  0x00007fca4c3e2ab0 in PBD::Semaphore::wait() (this=0x55f96eb89174) at ../libs/pbd/semutils.cc:120
#2  0x00007fca4e2d3052 in ARDOUR::Graph::run_one() (this=0x55f96eb89040) at ../libs/ardour/graph.cc:320
#3  0x00007fca4e2d35f3 in ARDOUR::Graph::helper_thread() (this=0x55f96eb89040) at ../libs/ardour/graph.cc:372
#4  0x00007fca4e2de2e5 in boost::_mfi::mf0<void, ARDOUR::Graph>::operator()(ARDOUR::Graph*) const (this=0x7fca283f9928, p=0x55f96eb89040) at /usr/include/boost/bind/mem_fn_template.hpp:49
#5  0x00007fca4e2dd9c7 in boost::_bi::list1<boost::_bi::value<ARDOUR::Graph*> >::operator()<boost::_mfi::mf0<void, ARDOUR::Graph>, boost::_bi::list0>(boost::_bi::type<void>, boost::_mfi::mf0<void, ARDOUR::Graph>&, boost::_bi::list0&, int) (this=0x7fca283f9938, f=..., a=...) at /usr/include/boost/bind/bind.hpp:259
#6  0x00007fca4e2dcb31 in boost::_bi::bind_t<void, boost::_mfi::mf0<void, ARDOUR::Graph>, boost::_bi::list1<boost::_bi::value<ARDOUR::Graph*> > >::operator()() (this=0x7fca283f9928) at /usr/include/boost/bind/bind.hpp:1294
#7  0x00007fca4e2db5c6 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(boost::detail::function::function_buffer&) (function_obj_ptr=...) at /usr/include/boost/function/function_template.hpp:158
#8  0x000055f96aa4538c in boost::function0<void>::operator()() const (this=0x7fca283f9920) at /usr/include/boost/function/function_template.hpp:763
#9  0x00007fca363bbd8b in ARDOUR::JACKAudioBackend::_start_process_thread(void*) (arg=0x55f97168fd80) at ../libs/backends/jack/jack_audiobackend.cc:970
#10 0x00007fca36e910ad in jack_thread_proxy (varg=0x55f97168fdc0) at thread.c:143
#11 0x00007fca4bec8ea7 in start_thread (arg=<optimized out>) at pthread_create.c:477
#12 0x00007fca4aad3a2f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 6 (Thread 0x7fca28ce8700 (LWP 479368)):
#0  syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:38
#1  0x00007fca4c3e2ab0 in PBD::Semaphore::wait() (this=0x55f96eb89174) at ../libs/pbd/semutils.cc:120
#2  0x00007fca4e2d3052 in ARDOUR::Graph::run_one() (this=0x55f96eb89040) at ../libs/ardour/graph.cc:320
#3  0x00007fca4e2d35f3 in ARDOUR::Graph::helper_thread() (this=0x55f96eb89040) at ../libs/ardour/graph.cc:372
#4  0x00007fca4e2de2e5 in boost::_mfi::mf0<void, ARDOUR::Graph>::operator()(ARDOUR::Graph*) const (this=0x7fca28ce7928, p=0x55f96eb89040) at /usr/include/boost/bind/mem_fn_template.hpp:49
#5  0x00007fca4e2dd9c7 in boost::_bi::list1<boost::_bi::value<ARDOUR::Graph*> >::operator()<boost::_mfi::mf0<void, ARDOUR::Graph>, boost::_bi::list0>(boost::_bi::type<void>, boost::_mfi::mf0<void, ARDOUR::Graph>&, boost::_bi::list0&, int) (this=0x7fca28ce7938, f=..., a=...) at /usr/include/boost/bind/bind.hpp:259
#6  0x00007fca4e2dcb31 in boost::_bi::bind_t<void, boost::_mfi::mf0<void, ARDOUR::Graph>, boost::_bi::list1<boost::_bi::value<ARDOUR::Graph*> > >::operator()() (this=0x7fca28ce7928) at /usr/include/boost/bind/bind.hpp:1294
#7  0x00007fca4e2db5c6 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(boost::detail::function::function_buffer&) (function_obj_ptr=...) at /usr/include/boost/function/function_template.hpp:158
#8  0x000055f96aa4538c in boost::function0<void>::operator()() const (this=0x7fca28ce7920) at /usr/include/boost/function/function_template.hpp:763
#9  0x00007fca363bbd8b in ARDOUR::JACKAudioBackend::_start_process_thread(void*) (arg=0x55f97168faf0) at ../libs/backends/jack/jack_audiobackend.cc:970
#10 0x00007fca36e910ad in jack_thread_proxy (varg=0x55f97168fb30) at thread.c:143
#11 0x00007fca4bec8ea7 in start_thread (arg=<optimized out>) at pthread_create.c:477
#12 0x00007fca4aad3a2f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 5 (Thread 0x7fca457fe700 (LWP 479273)):
#0  syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:38
#1  0x00007fca4c22234f in g_cond_wait () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fca4e777ac1 in peak_thread_work() () at ../libs/ardour/source_factory.cc:75
#3  0x00007fca4f3fab32 in boost::detail::function::void_function_invoker0<void (*)(), void>::invoke(boost::detail::function::function_buffer&) (function_ptr=...) at /usr/include/boost/function/function_template.hpp:117
#4  0x000055f96aa4538c in boost::function0<void>::operator()() const (this=0x55f96dbb2898) at /usr/include/boost/function/function_template.hpp:763
#5  0x00007fca4c3dcad1 in PBD::Thread::_run(void*) (arg=0x55f96dbb2870) at ../libs/pbd/pthread_utils.cc:488
#6  0x00007fca4bec8ea7 in start_thread (arg=<optimized out>) at pthread_create.c:477
#7  0x00007fca4aad3a2f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 4 (Thread 0x7fca44ffd700 (LWP 479274)):
#0  syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:38
#1  0x00007fca4c22234f in g_cond_wait () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fca4e777ac1 in peak_thread_work() () at ../libs/ardour/source_factory.cc:75
#3  0x00007fca4f3fab32 in boost::detail::function::void_function_invoker0<void (*)(), void>::invoke(boost::detail::function::function_buffer&) (function_ptr=...) at /usr/include/boost/function/function_template.hpp:117
#4  0x000055f96aa4538c in boost::function0<void>::operator()() const (this=0x55f96dbb2558) at /usr/include/boost/function/function_template.hpp:763
#5  0x00007fca4c3dcad1 in PBD::Thread::_run(void*) (arg=0x55f96dbb2530) at ../libs/pbd/pthread_utils.cc:488
#6  0x00007fca4bec8ea7 in start_thread (arg=<optimized out>) at pthread_create.c:477
#7  0x00007fca4aad3a2f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 3 (Thread 0x7fca29456700 (LWP 479357)):
#0  syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:38
#1  0x00007fca4c3e2ab0 in PBD::Semaphore::wait() (this=0x55f96eb89174) at ../libs/pbd/semutils.cc:120
#2  0x00007fca4e2d3052 in ARDOUR::Graph::run_one() (this=0x55f96eb89040) at ../libs/ardour/graph.cc:320
#3  0x00007fca4e2d35f3 in ARDOUR::Graph::helper_thread() (this=0x55f96eb89040) at ../libs/ardour/graph.cc:372
#4  0x00007fca4e2de2e5 in boost::_mfi::mf0<void, ARDOUR::Graph>::operator()(ARDOUR::Graph*) const (this=0x7fca29455928, p=0x55f96eb89040) at /usr/include/boost/bind/mem_fn_template.hpp:49
#5  0x00007fca4e2dd9c7 in boost::_bi::list1<boost::_bi::value<ARDOUR::Graph*> >::operator()<boost::_mfi::mf0<void, ARDOUR::Graph>, boost::_bi::list0>(boost::_bi::type<void>, boost::_mfi::mf0<void, ARDOUR::Graph>&, boost::_bi::list0&, int) (this=0x7fca29455938, f=..., a=...) at /usr/include/boost/bind/bind.hpp:259
#6  0x00007fca4e2dcb31 in boost::_bi::bind_t<void, boost::_mfi::mf0<void, ARDOUR::Graph>, boost::_bi::list1<boost::_bi::value<ARDOUR::Graph*> > >::operator()() (this=0x7fca29455928) at /usr/include/boost/bind/bind.hpp:1294
#7  0x00007fca4e2db5c6 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(boost::detail::function::function_buffer&) (function_obj_ptr=...) at /usr/include/boost/function/function_template.hpp:158
#8  0x000055f96aa4538c in boost::function0<void>::operator()() const (this=0x7fca29455920) at /usr/include/boost/function/function_template.hpp:763
#9  0x00007fca363bbd8b in ARDOUR::JACKAudioBackend::_start_process_thread(void*) (arg=0x55f97167a7c0) at ../libs/backends/jack/jack_audiobackend.cc:970
#10 0x00007fca36e910ad in jack_thread_proxy (varg=0x55f97167be40) at thread.c:143
#11 0x00007fca4bec8ea7 in start_thread (arg=<optimized out>) at pthread_create.c:477
#12 0x00007fca4aad3a2f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 2 (Thread 0x7fca0bfff700 (LWP 479311)):
#0  futex_wait_cancelable (private=0, expected=0, futex_word=0x7fca36ea38c8 <mb_ready_cond+40>) at ../sysdeps/nptl/futex-internal.h:186
#1  __pthread_cond_wait_common (abstime=0x0, clockid=0, mutex=0x7fca36ea3860 <mb_write_lock>, cond=0x7fca36ea38a0 <mb_ready_cond>) at pthread_cond_wait.c:508
#2  __pthread_cond_wait (cond=0x7fca36ea38a0 <mb_ready_cond>, mutex=0x7fca36ea3860 <mb_write_lock>) at pthread_cond_wait.c:638
#3  0x00007fca36e8be2c in mb_thread_func (arg=0x0) at messagebuffer.c:72
#4  0x00007fca4bec8ea7 in start_thread (arg=<optimized out>) at pthread_create.c:477
#5  0x00007fca4aad3a2f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 1 (Thread 0x7fca468d0180 (LWP 479267)):
#0  __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:50
#1  0x00007fca4a9fa537 in __GI_abort () at abort.c:79
#2  0x00007fca4cbf61d1 in Temporal::TempoMap::map_assert(bool, char const*, char const*, int) (expr=false, exprstr=0x7fca4cc1b3a5 "qn >= _quarters", file=0x7fca4cc1b258 "../libs/temporal/tempo.cc", line=507) at ../libs/temporal/tempo.cc:4704
#3  0x00007fca4cbd20ed in Temporal::TempoPoint::superclock_at(Temporal::Beats const&) const (this=0x55f977d7fb20, qn=...) at ../libs/temporal/tempo.cc:507
#4  0x00007fca4cbf4525 in Temporal::TempoMap::solve_constant_twist(Temporal::TempoPoint&, Temporal::TempoPoint&) (this=0x55f9723aee30, earlier=..., later=...) at ../libs/temporal/tempo.cc:4115
#5  0x00007fca4cbf48e4 in Temporal::TempoMap::constant_twist_tempi(Temporal::TempoPoint&, Temporal::TempoPoint&, Temporal::TempoPoint&, double) (this=0x55f9723aee30, prev=..., focus=..., next=..., tempo_value=90.897774575474031) at ../libs/temporal/tempo.cc:4199
#6  0x000055f96acfbeca in MappingTwistDrag::motion(_GdkEvent*, bool) (this=0x55f972065470, event=0x7fff42ad6760, first_move=true) at ../gtk2_ardour/editor_drag.cc:3634
#7  0x000055f96ace89fd in Drag::motion_handler(_GdkEvent*, bool) (this=0x55f972065470, event=0x7fff42ad6760, from_autoscroll=false) at ../gtk2_ardour/editor_drag.cc:553
#8  0x000055f96ace7736 in DragManager::motion_handler(_GdkEvent*, bool) (this=0x55f9735dd090, e=0x7fff42ad6760, from_autoscroll=false) at ../gtk2_ardour/editor_drag.cc:250
#9  0x000055f96ad62091 in Editor::motion_handler(ArdourCanvas::Item*, _GdkEvent*, bool) (this=0x55f9733cb020, item=0x55f96f28db40, event=0x7fff42ad6760, from_autoscroll=false) at ../gtk2_ardour/editor_mouse.cc:2285
#10 0x000055f96ace1419 in Editor::canvas_grid_zone_event(_GdkEvent*) (this=0x55f9733cb020, event=0x7fff42ad6760) at ../gtk2_ardour/editor_canvas_events.cc:1327
#11 0x000055f96ac7c131 in sigc::bound_mem_functor1<bool, Editor, _GdkEvent*>::operator()(_GdkEvent* const&) const (this=0x55f96f25da58, _A_a1=@0x7fff42ad6500: 0x7fff42ad6760) at /usr/include/sigc++-2.0/sigc++/functors/mem_fun.h:2066
#12 0x000055f96ac74de5 in sigc::adaptor_functor<sigc::bound_mem_functor1<bool, Editor, _GdkEvent*> >::operator()<_GdkEvent* const&>(_GdkEvent* const&) const (this=0x55f96f25da50, _A_arg1=@0x7fff42ad6500: 0x7fff42ad6760) at /usr/include/sigc++-2.0/sigc++/adaptors/adaptor_trait.h:89
#13 0x000055f96acd9ebc in sigc::internal::slot_call<sigc::bound_mem_functor1<bool, Editor, _GdkEvent*>, bool, _GdkEvent*>::call_it(sigc::internal::slot_rep*, _GdkEvent* const&) (rep=0x55f96f25da20, a_#0=@0x7fff42ad6500: 0x7fff42ad6760) at /usr/include/sigc++-2.0/sigc++/functors/slot.h:451
#14 0x000055f96b80d5a3 in sigc::internal::signal_emit1<bool, _GdkEvent*, ArdourCanvas::Item::EventAccumulator<bool> >::operator()(sigc::slot<bool (_GdkEvent*), sigc::nil, sigc::nil, sigc::nil, sigc::nil, sigc::nil, sigc::nil, sigc::nil> const&) const (this=0x7fff42ad63d8, _A_slot=...) at /usr/include/sigc++-2.0/sigc++/signal.h:860
#15 0x000055f96b80cb7d in sigc::internal::slot_iterator_buf<sigc::internal::signal_emit1<bool, _GdkEvent*, ArdourCanvas::Item::EventAccumulator<bool> >, bool>::operator*() const (this=0x7fff42ad6390) at /usr/include/sigc++-2.0/sigc++/signal.h:319
#16 0x000055f96b80be63 in ArdourCanvas::Item::EventAccumulator<bool>::operator()<sigc::internal::slot_iterator_buf<sigc::internal::signal_emit1<bool, _GdkEvent*, ArdourCanvas::Item::EventAccumulator<bool> >, bool> >(sigc::internal::slot_iterator_buf<sigc::internal::signal_emit1<bool, _GdkEvent*, ArdourCanvas::Item::EventAccumulator<bool> >, bool>, sigc::internal::slot_iterator_buf<sigc::internal::signal_emit1<bool, _GdkEvent*, ArdourCanvas::Item::EventAccumulator<bool> >, bool>) (this=0x7fff42ad63ff, first=..., last=...) at ../libs/canvas/canvas/item.h:257
#17 0x000055f96b80b09c in sigc::internal::signal_emit1<bool, _GdkEvent*, ArdourCanvas::Item::EventAccumulator<bool> >::emit(sigc::internal::signal_impl*, _GdkEvent* const&) (impl=0x55f96f25dcd0, _A_a1=@0x7fff42ad6500: 0x7fff42ad6760) at /usr/include/sigc++-2.0/sigc++/signal.h:879
#18 0x000055f96b80a0d3 in sigc::signal1<bool, _GdkEvent*, ArdourCanvas::Item::EventAccumulator<bool> >::emit(_GdkEvent* const&) const (this=0x55f96f28dbb0, _A_a1=@0x7fff42ad6500: 0x7fff42ad6760) at /usr/include/sigc++-2.0/sigc++/signal.h:2955
#19 0x000055f96b8094bd in sigc::signal1<bool, _GdkEvent*, ArdourCanvas::Item::EventAccumulator<bool> >::operator()(_GdkEvent* const&) const (this=0x55f96f28dbb0, _A_a1=@0x7fff42ad6500: 0x7fff42ad6760) at /usr/include/sigc++-2.0/sigc++/signal.h:2971
#20 0x00007fca4ca18771 in ArdourCanvas::GtkCanvas::deliver_event(_GdkEvent*) (this=0x55f97353fcb8, event=0x7fff42ad6760) at ../libs/canvas/canvas.cc:862
#21 0x00007fca4ca1a3f7 in ArdourCanvas::GtkCanvas::on_motion_notify_event(_GdkEventMotion*) (this=0x55f97353fcb8, ev=0x55f974092a00) at ../libs/canvas/canvas.cc:1234
#22 0x00007fca4b900df4 in Gtk::Widget_Class::motion_notify_event_callback(_GtkWidget*, _GdkEventMotion*) () at /lib/x86_64-linux-gnu/libgtkmm-2.4.so.1
#23 0x00007fca4b1391ab in  () at /lib/x86_64-linux-gnu/libgtk-x11-2.0.so.0
#24 0x00007fca4c0cb0a2 in g_closure_invoke () at /lib/x86_64-linux-gnu/libgobject-2.0.so.0
#25 0x00007fca4c0dce6e in  () at /lib/x86_64-linux-gnu/libgobject-2.0.so.0
#26 0x00007fca4c0e3259 in g_signal_emit_valist () at /lib/x86_64-linux-gnu/libgobject-2.0.so.0
#27 0x00007fca4c0e3c3f in g_signal_emit () at /lib/x86_64-linux-gnu/libgobject-2.0.so.0
#28 0x00007fca4b258fe4 in  () at /lib/x86_64-linux-gnu/libgtk-x11-2.0.so.0
#29 0x00007fca4b1377d4 in gtk_propagate_event () at /lib/x86_64-linux-gnu/libgtk-x11-2.0.so.0
#30 0x00007fca4b137c4b in gtk_main_do_event () at /lib/x86_64-linux-gnu/libgtk-x11-2.0.so.0
#31 0x00007fca4b553afc in  () at /lib/x86_64-linux-gnu/libgdk-x11-2.0.so.0
#32 0x00007fca4c1d0e6b in g_main_context_dispatch () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#33 0x00007fca4c1d1118 in  () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#34 0x00007fca4c1d140b in g_main_loop_run () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
#35 0x00007fca4b136b2a in gtk_main () at /lib/x86_64-linux-gnu/libgtk-x11-2.0.so.0
#36 0x00007fca4c58a498 in Gtkmm2ext::UI::run(Receiver&) (this=0x55f96e32ae40, old_receiver=...) at ../libs/gtkmm2ext/gtk_ui.cc:305
#37 0x000055f96b0c1584 in main(int, char**) (argc=1, argv=0x7fff42ad7448) at ../gtk2_ardour/main.cc:471
(gdb)