gdb output when trying to add a Harrison vox plugin.  Ardour completely stopped responding.

steve@steve-comp:/opt/Ardour-6.0.pre1.333-dbg/bin$ ./ardour6 --gdb
GNU gdb (Ubuntu 8.1-0ubuntu3.2) 8.1.0.20180409-git
Copyright (C) 2018 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-linux-gnu".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>.
Find the GDB manual and other documentation resources online at:
<http://www.gnu.org/software/gdb/documentation/>.
For help, type "help".
Type "apropos word" to search for commands related to "word"...
Reading symbols from /opt/Ardour-6.0.pre1.333-dbg/bin/ardour-6.0.pre1.333...done.
(gdb) run
Starting program: /opt/Ardour-6.0.pre1.333-dbg/bin/ardour-6.0.pre1.333 
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
bind txt domain [gtk2_ardour6] to /opt/Ardour-6.0.pre1.333-dbg/share/locale
Ardour6.0.pre1.333 (built using 6.0-pre1-333-gdaec036faa and GCC version 6.3.0 20170516)
Ardour: [INFO]: Your system is configured to limit Ardour to 4096 open files
Ardour: [INFO]: Loading system configuration file /opt/Ardour-6.0.pre1.333-dbg/etc/system_config
Ardour: [INFO]: Loading user configuration file /home/steve/.config/ardour6/config
[New Thread 0x7fffe68cf700 (LWP 4678)]
Ardour: [INFO]: CPU vendor: GenuineIntel
Ardour: [INFO]: AVX-capable processor
Ardour: [INFO]: CPU brand:        Intel(R) Core(TM) i3-3217U CPU @ 1.80GHz
Ardour: [INFO]: Using SSE optimized routines
[New Thread 0x7fffe60ce700 (LWP 4679)]
[New Thread 0x7fffe58cd700 (LWP 4680)]
[New Thread 0x7fffe50cc700 (LWP 4681)]
Ardour: [INFO]: Loading plugin meta data file /opt/Ardour-6.0.pre1.333-dbg/share/plugin_metadata/plugin_tags
[New Thread 0x7fffd5757700 (LWP 4682)]
[Thread 0x7fffd5757700 (LWP 4682) exited]
[New Thread 0x7fffd5757700 (LWP 4683)]
[New Thread 0x7fffcfb74700 (LWP 4684)]
*** WEAK-JACK: initializing
*** WEAK-JACK: OK. (0)
[New Thread 0x7fffccca0700 (LWP 4685)]
Cannot xinstall SIGPIPE error handler
Ardour: [INFO]: Loading default ui configuration file /opt/Ardour-6.0.pre1.333-dbg/etc/default_ui_config
Ardour: [INFO]: Loading user ui configuration file /home/steve/.config/ardour6/ui_config
Ardour: [INFO]: Loading 449 MIDI patches from /opt/Ardour-6.0.pre1.333-dbg/share/patchfiles
Color shuttle bg not found
Color play head not found
Ardour: [INFO]: Loading color file /opt/Ardour-6.0.pre1.333-dbg/share/themes/dark-ardour.colors
Ardour: [INFO]: Loading ui configuration file /opt/Ardour-6.0.pre1.333-dbg/etc/clearlooks.rc
Ardour: [INFO]: Loading bindings from /opt/Ardour-6.0.pre1.333-dbg/etc/ardour.keys
Loading ui configuration file /opt/Ardour-6.0.pre1.333-dbg/etc/clearlooks.rc
[New Thread 0x7fffe409d800 (LWP 4686)]
[New Thread 0x7fffbffff700 (LWP 4687)]
[Thread 0x7fffbffff700 (LWP 4687) exited]
[New Thread 0x7fffbffff700 (LWP 4688)]
[New Thread 0x7fffbedcc700 (LWP 4689)]
[New Thread 0x7fffbe5cb700 (LWP 4690)]
[New Thread 0x7fffbddca700 (LWP 4691)]
Found nothing along /home/steve/.config/ardour6/templates:/opt/Ardour-6.0.pre1.333-dbg/share/templates
pingback: No Error
[Thread 0x7fffe409d800 (LWP 4686) exited]
[New Thread 0x7fffbd5c9700 (LWP 4692)]
[Thread 0x7fffbd5c9700 (LWP 4692) exited]
[Thread 0x7fffbe5cb700 (LWP 4690) exited]
[Thread 0x7fffbedcc700 (LWP 4689) exited]
[Thread 0x7fffccca0700 (LWP 4685) exited]
[New Thread 0x7fffbd5c9700 (LWP 4694)]
playback :
  nchan  : 2
  fsamp  : 44100
  fsize  : 4096
  nfrag  : 3
  format : S32_LE
capture  :
  nchan  : 2
  fsamp  : 44100
  fsize  : 4096
  nfrag  : 2
  format : S32_LE
synced
[New Thread 0x7fffbc957d80 (LWP 4695)]
[New Thread 0x7fffbedcc700 (LWP 4696)]
Scanning folders for bundled LV2s: /opt/Ardour-6.0.pre1.333-dbg/lib/LV2
error: /usr/lib/lv2/lsp-plugins.lv2/spectrum_analyzer_x1.ttl:278:2: missing ';' or '.'
error: /usr/lib/lv2/lsp-plugins.lv2/spectrum_analyzer_x1.ttl:278:2: expected `]', not `l'
lilv_world_load_file(): error: Error loading file `file:///usr/lib/lv2/lsp-plugins.lv2/spectrum_analyzer_x1.ttl'
[New Thread 0x7fffbe5cb700 (LWP 4697)]
[New Thread 0x7fffabfff700 (LWP 4698)]
[New Thread 0x7fffab7fe700 (LWP 4700)]
[Thread 0x7fffab7fe700 (LWP 4700) exited]
[Thread 0x7fffbe5cb700 (LWP 4697) exited]
[Thread 0x7fffbddca700 (LWP 4691) exited]
[New Thread 0x7fffab7fe700 (LWP 4702)]
[Thread 0x7fffab7fe700 (LWP 4702) exited]
Set cursor set to default
 loading from /media/steve/Erdeman/TMA Sing My Way/Sind My Way Av6 with controller ALSA/Sing My Way Av6 SteveErdemanMix as Sing My Way Av6 SteveErdemanMix templ  is_new 0 bp 0
[New Thread 0x7fffbc331d80 (LWP 4703)]
[New Thread 0x7fffbc317d80 (LWP 4704)]
[New Thread 0x7fffbc2fdd80 (LWP 4705)]
[New Thread 0x7fffbc2e3d80 (LWP 4706)]
[New Thread 0x7fffbc2c9d80 (LWP 4707)]
[New Thread 0x7fffbc2afd80 (LWP 4708)]
[Thread 0x7fffabfff700 (LWP 4698) exited]
[New Thread 0x7fffbc295800 (LWP 4709)]
[New Thread 0x7fffabfff700 (LWP 4710)]
[New Thread 0x7fffab7fe700 (LWP 4711)]
[New Thread 0x7fffbddca700 (LWP 4712)]
[New Thread 0x7fffbe5cb700 (LWP 4713)]
[New Thread 0x7fff7696e700 (LWP 4714)]
locate took 664694 usecs for 90 tracks = 7385 per track
[New Thread 0x7fff7616d700 (LWP 4715)]
[New Thread 0x7fff7596c700 (LWP 4716)]
[New Thread 0x7fff7516b700 (LWP 4717)]
ardour-6.0.pre1.333: ../gtk2_ardour/lv2_plugin_ui.cc:393: void LV2PluginUI::lv2ui_instantiate(const string&): Assertion `fi == features_count + (is_external_ui ? 3 : 1)' failed.

Thread 1 "gui" received signal SIGABRT, Aborted.
__GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:51
51	../sysdeps/unix/sysv/linux/raise.c: No such file or directory.
(gdb) thread apply all bt

Thread 38 (Thread 0x7fff7516b700 (LWP 4717)):
#0  syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:38
#1  0x00007ffff2fc4e4c in g_cond_wait () from /opt/Ardour-6.0.pre1.333-dbg/lib/libglib-2.0.so.0
#2  0x00007ffff793e483 in ArdourWaveView::WaveViewDrawRequestQueue::dequeue (this=0x555558136de8, block=true) at ../libs/waveview/wave_view_private.cc:299
#3  0x00007ffff793e7a0 in ArdourWaveView::WaveViewThreads::dequeue_draw_request () at ../libs/waveview/wave_view_private.cc:368
#4  0x00007ffff793eafe in ArdourWaveView::WaveViewDrawingThread::run (this=0x5555610e8380) at ../libs/waveview/wave_view_private.cc:450
#5  0x00007ffff794324a in sigc::bound_mem_functor0<void, ArdourWaveView::WaveViewDrawingThread>::operator() (this=0x55556520c248)
    at /home/ardour/linux-x86_64-v5/gtk/inst/include/sigc++-2.0/sigc++/functors/mem_fun.h:1787
#6  0x00007ffff7942d74 in sigc::adaptor_functor<sigc::bound_mem_functor0<void, ArdourWaveView::WaveViewDrawingThread> >::operator() (this=0x55556520c240)
    at /home/ardour/linux-x86_64-v5/gtk/inst/include/sigc++-2.0/sigc++/adaptors/adaptor_trait.h:256
#7  0x00007ffff794276d in sigc::internal::slot_call0<sigc::bound_mem_functor0<void, ArdourWaveView::WaveViewDrawingThread>, void>::call_it (rep=0x55556520c210)
    at /home/ardour/linux-x86_64-v5/gtk/inst/include/sigc++-2.0/sigc++/functors/slot.h:103
#8  0x00007ffff350dc4d in ?? () from /opt/Ardour-6.0.pre1.333-dbg/lib/libglibmm-2.4.so.1
#9  0x00007ffff2fa31e5 in ?? () from /opt/Ardour-6.0.pre1.333-dbg/lib/libglib-2.0.so.0
#10 0x00007fffeecc66db in start_thread (arg=0x7fff7516b700) at pthread_create.c:463
#11 0x00007fffebf2388f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 37 (Thread 0x7fff7596c700 (LWP 4716)):
#0  syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:38
#1  0x00007ffff2fc4e4c in g_cond_wait () from /opt/Ardour-6.0.pre1.333-dbg/lib/libglib-2.0.so.0
#2  0x00007ffff793e483 in ArdourWaveView::WaveViewDrawRequestQueue::dequeue (this=0x555558136de8, block=true) at ../libs/waveview/wave_view_private.cc:299
#3  0x00007ffff793e7a0 in ArdourWaveView::WaveViewThreads::dequeue_draw_request () at ../libs/waveview/wave_view_private.cc:368
#4  0x00007ffff793eafe in ArdourWaveView::WaveViewDrawingThread::run (this=0x55556110ded0) at ../libs/waveview/wave_view_private.cc:450
#5  0x00007ffff794324a in sigc::bound_mem_functor0<void, ArdourWaveView::WaveViewDrawingThread>::operator() (this=0x555565572558)
    at /home/ardour/linux-x86_64-v5/gtk/inst/include/sigc++-2.0/sigc++/functors/mem_fun.h:1787
#6  0x00007ffff7942d74 in sigc::adaptor_functor<sigc::bound_mem_functor0<void, ArdourWaveView::WaveViewDrawingThread> >::operator() (this=0x555565572550)
    at /home/ardour/linux-x86_64-v5/gtk/inst/include/sigc++-2.0/sigc++/adaptors/adaptor_trait.h:256
#7  0x00007ffff794276d in sigc::internal::slot_call0<sigc::bound_mem_functor0<void, ArdourWaveView::WaveViewDrawingThread>, void>::call_it (rep=0x555565572520)
    at /home/ardour/linux-x86_64-v5/gtk/inst/include/sigc++-2.0/sigc++/functors/slot.h:103
#8  0x00007ffff350dc4d in ?? () from /opt/Ardour-6.0.pre1.333-dbg/lib/libglibmm-2.4.so.1
#9  0x00007ffff2fa31e5 in ?? () from /opt/Ardour-6.0.pre1.333-dbg/lib/libglib-2.0.so.0
#10 0x00007fffeecc66db in start_thread (arg=0x7fff7596c700) at pthread_create.c:463
#11 0x00007fffebf2388f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 36 (Thread 0x7fff7616d700 (LWP 4715)):
#0  syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:38
#1  0x00007ffff2fc4e4c in g_cond_wait () from /opt/Ardour-6.0.pre1.333-dbg/lib/libglib-2.0.so.0
#2  0x00007ffff793e483 in ArdourWaveView::WaveViewDrawRequestQueue::dequeue (this=0x555558136de8, block=true) at ../libs/waveview/wave_view_private.cc:299
#3  0x00007ffff793e7a0 in ArdourWaveView::WaveViewThreads::dequeue_draw_request () at ../libs/waveview/wave_view_private.cc:368
---Type <return> to continue, or q <return> to quit---
#4  0x00007ffff793eafe in ArdourWaveView::WaveViewDrawingThread::run (this=0x5555610c7ef0) at ../libs/waveview/wave_view_private.cc:450
#5  0x00007ffff794324a in sigc::bound_mem_functor0<void, ArdourWaveView::WaveViewDrawingThread>::operator() (this=0x5555658fdfd8)
    at /home/ardour/linux-x86_64-v5/gtk/inst/include/sigc++-2.0/sigc++/functors/mem_fun.h:1787
#6  0x00007ffff7942d74 in sigc::adaptor_functor<sigc::bound_mem_functor0<void, ArdourWaveView::WaveViewDrawingThread> >::operator() (this=0x5555658fdfd0)
    at /home/ardour/linux-x86_64-v5/gtk/inst/include/sigc++-2.0/sigc++/adaptors/adaptor_trait.h:256
#7  0x00007ffff794276d in sigc::internal::slot_call0<sigc::bound_mem_functor0<void, ArdourWaveView::WaveViewDrawingThread>, void>::call_it (rep=0x5555658fdfa0)
    at /home/ardour/linux-x86_64-v5/gtk/inst/include/sigc++-2.0/sigc++/functors/slot.h:103
#8  0x00007ffff350dc4d in ?? () from /opt/Ardour-6.0.pre1.333-dbg/lib/libglibmm-2.4.so.1
#9  0x00007ffff2fa31e5 in ?? () from /opt/Ardour-6.0.pre1.333-dbg/lib/libglib-2.0.so.0
#10 0x00007fffeecc66db in start_thread (arg=0x7fff7616d700) at pthread_create.c:463
#11 0x00007fffebf2388f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 35 (Thread 0x7fff7696e700 (LWP 4714)):
#0  0x00007fffeecd0c60 in __GI___nanosleep (requested_time=0x7fff7696dbb0, remaining=0x7fff7696dbc0) at ../sysdeps/unix/sysv/linux/nanosleep.c:28
#1  0x00007ffff2fa4a38 in g_usleep () from /opt/Ardour-6.0.pre1.333-dbg/lib/libglib-2.0.so.0
#2  0x00007ffff698682c in ARDOUR::AutomationWatch::thread (this=0x55555c2ffa60) at ../libs/ardour/automation_watch.cc:195
#3  0x00007ffff698c06f in boost::_mfi::mf0<void, ARDOUR::AutomationWatch>::operator() (this=0x55555afffa00, p=0x55555c2ffa60)
    at /home/ardour/linux-x86_64-v5/gtk/inst/include/boost/bind/mem_fn_template.hpp:49
#4  0x00007ffff698bcb4 in boost::_bi::list1<boost::_bi::value<ARDOUR::AutomationWatch*> >::operator()<boost::_mfi::mf0<void, ARDOUR::AutomationWatch>, boost::_bi::list0> (this=0x55555afffa10, f=..., a=...) at /home/ardour/linux-x86_64-v5/gtk/inst/include/boost/bind/bind.hpp:259
#5  0x00007ffff698b3d5 in boost::_bi::bind_t<void, boost::_mfi::mf0<void, ARDOUR::AutomationWatch>, boost::_bi::list1<boost::_bi::value<ARDOUR::AutomationWatch*> > >::operator() (this=0x55555afffa00) at /home/ardour/linux-x86_64-v5/gtk/inst/include/boost/bind/bind.hpp:1294
#6  0x00007ffff698b356 in sigc::adaptor_functor<boost::_bi::bind_t<void, boost::_mfi::mf0<void, ARDOUR::AutomationWatch>, boost::_bi::list1<boost::_bi::value<ARDOUR::AutomationWatch*> > > >::operator() (this=0x55555afffa00) at /home/ardour/linux-x86_64-v5/gtk/inst/include/sigc++-2.0/sigc++/adaptors/adaptor_trait.h:256
#7  0x00007ffff698abb4 in sigc::internal::slot_call0<boost::_bi::bind_t<void, boost::_mfi::mf0<void, ARDOUR::AutomationWatch>, boost::_bi::list1<boost::_bi::value<ARDOUR::AutomationWatch*> > >, void>::call_it (rep=0x55555afff9d0) at /home/ardour/linux-x86_64-v5/gtk/inst/include/sigc++-2.0/sigc++/functors/slot.h:103
#8  0x00007ffff350dc4d in ?? () from /opt/Ardour-6.0.pre1.333-dbg/lib/libglibmm-2.4.so.1
#9  0x00007ffff2fa31e5 in ?? () from /opt/Ardour-6.0.pre1.333-dbg/lib/libglib-2.0.so.0
#10 0x00007fffeecc66db in start_thread (arg=0x7fff7696e700) at pthread_create.c:463
#11 0x00007fffebf2388f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 34 (Thread 0x7fffbe5cb700 (LWP 4713)):
#0  0x00007ffff6e85da3 in __gnu_cxx::__aligned_membuf<boost::shared_ptr<ARDOUR::BackendPort> >::_M_ptr (this=0x55555ca0f500)
    at /usr/include/c++/6/ext/aligned_buffer.h:75
#1  0x00007ffff6e84bf8 in std::_Rb_tree_node<boost::shared_ptr<ARDOUR::BackendPort> >::_M_valptr (this=0x55555ca0f4e0) at /usr/include/c++/6/bits/stl_tree.h:161
#2  0x00007ffff6e83d13 in std::_Rb_tree_const_iterator<boost::shared_ptr<ARDOUR::BackendPort> >::operator* (this=0x7fffbe5ca010)
    at /usr/include/c++/6/bits/stl_tree.h:279
#3  0x00007ffff6e86ca2 in __gnu_cxx::__ops::_Iter_equals_val<boost::shared_ptr<ARDOUR::BackendPort> const>::operator()<std::_Rb_tree_const_iterator<boost::shared_ptr<ARDOUR::BackendPort> > > (this=0x7fffbe5ca048, __it={px = 0x55555e72bb40, pn = {pi_ = 0x55555e733be0}}) at /usr/include/c++/6/bits/predefined_ops.h:199
#4  0x00007ffff6e85690 in std::__find_if<std::_Rb_tree_const_iterator<boost::shared_ptr<ARDOUR::BackendPort> >, __gnu_cxx::__ops::_Iter_equals_val<boost::shared_ptr<ARDO---Type <return> to continue, or q <return> to quit---
UR::BackendPort> const> > (__first={px = 0x55555e72bb40, pn = {pi_ = 0x55555e733be0}}, __last={px = 0x14b, pn = {pi_ = 0x0}}, __pred=...)
    at /usr/include/c++/6/bits/stl_algo.h:104
#5  0x00007ffff6e846fb in std::__find_if<std::_Rb_tree_const_iterator<boost::shared_ptr<ARDOUR::BackendPort> >, __gnu_cxx::__ops::_Iter_equals_val<boost::shared_ptr<ARDOUR::BackendPort> const> > (__first={px = 0x55555bd80110, pn = {pi_ = 0x55555bd881b0}}, __last={px = 0x14b, pn = {pi_ = 0x0}}, __pred=...)
    at /usr/include/c++/6/bits/stl_algo.h:162
#6  0x00007ffff6e8391a in std::find<std::_Rb_tree_const_iterator<boost::shared_ptr<ARDOUR::BackendPort> >, boost::shared_ptr<ARDOUR::BackendPort> > (__first=
    {px = 0x55555bd80110, pn = {pi_ = 0x55555bd881b0}}, __last={px = 0x14b, pn = {pi_ = 0x0}}, __val=...) at /usr/include/c++/6/bits/stl_algo.h:3793
#7  0x00007ffff6e8348d in ARDOUR::PortEngineSharedImpl::valid_port (this=0x5555572b6020, port=...) at ../libs/ardour/ardour/port_engine_shared.h:188
#8  0x00007ffff6e80ee4 in ARDOUR::PortEngineSharedImpl::get_port_name[abi:cxx11](boost::shared_ptr<ARDOUR::ProtoPort> const&) const (this=0x5555572b6020, 
    port_handle=...) at ../libs/ardour/port_engine_shared.cc:473
#9  0x00007fffccd2a04f in ARDOUR::AlsaAudioBackend::get_port_name[abi:cxx11](boost::shared_ptr<ARDOUR::ProtoPort> const&) const (this=0x5555572b6000, ph=...)
    at ../libs/backends/alsa/alsa_audiobackend.h:233
#10 0x00007ffff6e8cef7 in ARDOUR::PortManager::get_port_by_name (this=0x555557109530, portname="ardour:Master/audio_in 2") at ../libs/ardour/port_manager.cc:312
#11 0x00007ffff6e77f9b in ARDOUR::Port::get_connected_latency_range (this=0x55555df0eb20, range=..., playback=true) at ../libs/ardour/port.cc:506
#12 0x00007ffff6ae4acf in ARDOUR::IO::connected_latency (this=0x55555de852d0, for_playback=true) at ../libs/ardour/io.cc:1332
#13 0x00007ffff6f02e60 in ARDOUR::Route::update_signal_latency (this=0x55555de79e30, apply_to_delayline=false) at ../libs/ardour/route.cc:4186
#14 0x00007ffff6f7045b in ARDOUR::Session::update_route_latency (this=0x555558bba820, playback=false, apply_to_delayline=false) at ../libs/ardour/session.cc:6522
#15 0x00007ffff6f7144f in ARDOUR::Session::update_latency_compensation (this=0x555558bba820, force_whole_graph=false, called_from_backend=false)
    at ../libs/ardour/session.cc:6667
#16 0x00007ffff6f72e88 in ARDOUR::Session::auto_connect_thread_run (this=0x555558bba820) at ../libs/ardour/session.cc:6988
#17 0x00007ffff6f72c04 in ARDOUR::Session::auto_connect_thread (arg=0x555558bba820) at ../libs/ardour/session.cc:6947
#18 0x00007fffeecc66db in start_thread (arg=0x7fffbe5cb700) at pthread_create.c:463
#19 0x00007fffebf2388f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 33 (Thread 0x7fffbddca700 (LWP 4712)):
#0  0x00007fffeeccc9f3 in futex_wait_cancelable (private=<optimized out>, expected=0, futex_word=0x555558bbc600) at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1  __pthread_cond_wait_common (abstime=0x0, mutex=0x555558bbc5b0, cond=0x555558bbc5d8) at pthread_cond_wait.c:502
#2  __pthread_cond_wait (cond=0x555558bbc5d8, mutex=0x555558bbc5b0) at pthread_cond_wait.c:655
#3  0x00007ffff6feb637 in ARDOUR::Session::emit_thread_run (this=0x555558bba820) at ../libs/ardour/session_process.cc:1107
#4  0x00007ffff6feb5d4 in ARDOUR::Session::emit_thread (arg=0x555558bba820) at ../libs/ardour/session_process.cc:1096
#5  0x00007fffeecc66db in start_thread (arg=0x7fffbddca700) at pthread_create.c:463
#6  0x00007fffebf2388f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 32 (Thread 0x7fffab7fe700 (LWP 4711)):
#0  0x00007fffebf16bf9 in __GI___poll (fds=0x7fff70018ce0, nfds=2, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007ffff2f73d66 in ?? () from /opt/Ardour-6.0.pre1.333-dbg/lib/libglib-2.0.so.0
#2  0x00007ffff2f740f2 in g_main_loop_run () from /opt/Ardour-6.0.pre1.333-dbg/lib/libglib-2.0.so.0
#3  0x00007ffff41ac776 in BaseUI::main_thread (this=0x5555594c1368) at ../libs/pbd/base_ui.cc:98
#4  0x00007ffff41b0898 in sigc::bound_mem_functor0<void, BaseUI>::operator() (this=0x55555a5c9088)
    at /home/ardour/linux-x86_64-v5/gtk/inst/include/sigc++-2.0/sigc++/functors/mem_fun.h:1787
---Type <return> to continue, or q <return> to quit---
#5  0x00007ffff41b04d8 in sigc::adaptor_functor<sigc::bound_mem_functor0<void, BaseUI> >::operator() (this=0x55555a5c9080)
    at /home/ardour/linux-x86_64-v5/gtk/inst/include/sigc++-2.0/sigc++/adaptors/adaptor_trait.h:256
#6  0x00007ffff41aff19 in sigc::internal::slot_call0<sigc::bound_mem_functor0<void, BaseUI>, void>::call_it (rep=0x55555a5c9050)
    at /home/ardour/linux-x86_64-v5/gtk/inst/include/sigc++-2.0/sigc++/functors/slot.h:103
#7  0x00007ffff350dc4d in ?? () from /opt/Ardour-6.0.pre1.333-dbg/lib/libglibmm-2.4.so.1
#8  0x00007ffff2fa31e5 in ?? () from /opt/Ardour-6.0.pre1.333-dbg/lib/libglib-2.0.so.0
#9  0x00007fffeecc66db in start_thread (arg=0x7fffab7fe700) at pthread_create.c:463
#10 0x00007fffebf2388f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 31 (Thread 0x7fffabfff700 (LWP 4710)):
#0  0x00007fffebf16bf9 in __GI___poll (fds=0x7fff8817a7d0, nfds=4, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007ffff2f73d66 in ?? () from /opt/Ardour-6.0.pre1.333-dbg/lib/libglib-2.0.so.0
#2  0x00007ffff2f740f2 in g_main_loop_run () from /opt/Ardour-6.0.pre1.333-dbg/lib/libglib-2.0.so.0
#3  0x00007ffff41ac776 in BaseUI::main_thread (this=0x55555a90a3e0) at ../libs/pbd/base_ui.cc:98
#4  0x00007ffff41b0898 in sigc::bound_mem_functor0<void, BaseUI>::operator() (this=0x555559182ba8)
    at /home/ardour/linux-x86_64-v5/gtk/inst/include/sigc++-2.0/sigc++/functors/mem_fun.h:1787
#5  0x00007ffff41b04d8 in sigc::adaptor_functor<sigc::bound_mem_functor0<void, BaseUI> >::operator() (this=0x555559182ba0)
    at /home/ardour/linux-x86_64-v5/gtk/inst/include/sigc++-2.0/sigc++/adaptors/adaptor_trait.h:256
#6  0x00007ffff41aff19 in sigc::internal::slot_call0<sigc::bound_mem_functor0<void, BaseUI>, void>::call_it (rep=0x555559182b70)
    at /home/ardour/linux-x86_64-v5/gtk/inst/include/sigc++-2.0/sigc++/functors/slot.h:103
#7  0x00007ffff350dc4d in ?? () from /opt/Ardour-6.0.pre1.333-dbg/lib/libglibmm-2.4.so.1
#8  0x00007ffff2fa31e5 in ?? () from /opt/Ardour-6.0.pre1.333-dbg/lib/libglib-2.0.so.0
#9  0x00007fffeecc66db in start_thread (arg=0x7fffabfff700) at pthread_create.c:463
#10 0x00007fffebf2388f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 30 (Thread 0x7fffbc295800 (LWP 4709)):
#0  0x00007fffebf16bf9 in __GI___poll (fds=0x7fffbc294428, nfds=1, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007ffff41c25d8 in CrossThreadChannel::poll_for_request (this=0x555558728f58) at ../libs/pbd/crossthread.posix.cc:102
#2  0x00007ffff41c2641 in CrossThreadChannel::receive (this=0x555558728f58, msg=@0x7fffbc2944ef: 0 '\000', wait=true) at ../libs/pbd/crossthread.posix.cc:123
#3  0x00007ffff699c366 in ARDOUR::Butler::thread_work (this=0x555558728ec0) at ../libs/ardour/butler.cc:172
#4  0x00007ffff699c0e7 in ARDOUR::Butler::_thread_work (arg=0x555558728ec0) at ../libs/ardour/butler.cc:153
#5  0x00007ffff41e5688 in fake_thread_start (arg=0x555559182380) at ../libs/pbd/pthread_utils.cc:107
#6  0x00007fffeecc66db in start_thread (arg=0x7fffbc295800) at pthread_create.c:463
#7  0x00007fffebf2388f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 29 (Thread 0x7fffbc2afd80 (LWP 4708)):
#0  0x00007fffeeccf6d6 in futex_abstimed_wait_cancelable (private=0, abstime=0x0, expected=0, futex_word=0x55555875c768)
    at ../sysdeps/unix/sysv/linux/futex-internal.h:205
#1  do_futex_wait (sem=sem@entry=0x55555875c768, abstime=0x0) at sem_waitcommon.c:111
#2  0x00007fffeeccf7c8 in __new_sem_wait_slow (sem=0x55555875c768, abstime=0x0) at sem_waitcommon.c:181
---Type <return> to continue, or q <return> to quit---
#3  0x00007ffff6ab7f9a in PBD::Semaphore::wait (this=0x55555875c768) at ../libs/pbd/pbd/semutils.h:64
#4  0x00007ffff6ab4ac6 in ARDOUR::Graph::reached_terminal_node (this=0x55555875c690) at ../libs/ardour/graph.cc:301
#5  0x00007ffff6abc853 in ARDOUR::GraphNode::finish (this=0x55555bca94b8, chain=0) at ../libs/ardour/graphnode.cc:73
#6  0x00007ffff6ab8004 in ARDOUR::GraphNode::run (this=0x55555bca94b8, chain=0) at ../libs/ardour/ardour/graphnode.h:63
#7  0x00007ffff6ab58a4 in ARDOUR::Graph::run_one (this=0x55555875c690) at ../libs/ardour/graph.cc:442
#8  0x00007ffff6ab5bee in ARDOUR::Graph::helper_thread (this=0x55555875c690) at ../libs/ardour/graph.cc:470
#9  0x00007ffff6abc18b in boost::_mfi::mf0<void, ARDOUR::Graph>::operator() (this=0x7fffbc2af378, p=0x55555875c690)
    at /home/ardour/linux-x86_64-v5/gtk/inst/include/boost/bind/mem_fn_template.hpp:49
#10 0x00007ffff6abb940 in boost::_bi::list1<boost::_bi::value<ARDOUR::Graph*> >::operator()<boost::_mfi::mf0<void, ARDOUR::Graph>, boost::_bi::list0> (
    this=0x7fffbc2af388, f=..., a=...) at /home/ardour/linux-x86_64-v5/gtk/inst/include/boost/bind/bind.hpp:259
#11 0x00007ffff6abad9d in boost::_bi::bind_t<void, boost::_mfi::mf0<void, ARDOUR::Graph>, boost::_bi::list1<boost::_bi::value<ARDOUR::Graph*> > >::operator() (
    this=0x7fffbc2af378) at /home/ardour/linux-x86_64-v5/gtk/inst/include/boost/bind/bind.hpp:1294
#12 0x00007ffff6aba641 in boost::detail::function::void_function_obj_invoker0<boost::_bi::bind_t<void, boost::_mfi::mf0<void, ARDOUR::Graph>, boost::_bi::list1<boost::_bi::value<ARDOUR::Graph*> > >, void>::invoke (function_obj_ptr=...) at /home/ardour/linux-x86_64-v5/gtk/inst/include/boost/function/function_template.hpp:159
#13 0x0000555555b8ae94 in boost::function0<void>::operator() (this=0x7fffbc2af370)
    at /home/ardour/linux-x86_64-v5/gtk/inst/include/boost/function/function_template.hpp:769
#14 0x00007fffccd1fdf7 in ARDOUR::AlsaAudioBackend::alsa_process_thread (arg=0x5555585cda20) at ../libs/backends/alsa/alsa_audiobackend.cc:1118
#15 0x00007fffeecc66db in start_thread (arg=0x7fffbc2afd80) at pthread_create.c:463
#16 0x00007fffebf2388f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 28 (Thread 0x7fffbc2c9d80 (LWP 4707)):
#0  0x00007fffeeccf6d6 in futex_abstimed_wait_cancelable (private=0, abstime=0x0, expected=0, futex_word=0x55555875c740)
    at ../sysdeps/unix/sysv/linux/futex-internal.h:205
#1  do_futex_wait (sem=sem@entry=0x55555875c740, abstime=0x0) at sem_waitcommon.c:111
#2  0x00007fffeeccf7c8 in __new_sem_wait_slow (sem=0x55555875c740, abstime=0x0) at sem_waitcommon.c:181
#3  0x00007ffff6ab7f9a in PBD::Semaphore::wait (this=0x55555875c740) at ../libs/pbd/pbd/semutils.h:64
#4  0x00007ffff6ab5736 in ARDOUR::Graph::run_one (this=0x55555875c690) at ../libs/ardour/graph.cc:426
#5  0x00007ffff6ab5bee in ARDOUR::Graph::helper_thread (this=0x55555875c690) at ../libs/ardour/graph.cc:470
#6  0x00007ffff6abc18b in boost::_mfi::mf0<void, ARDOUR::Graph>::operator() (this=0x7fffbc2c9378, p=0x55555875c690)
    at /home/ardour/linux-x86_64-v5/gtk/inst/include/boost/bind/mem_fn_template.hpp:49
#7  0x00007ffff6abb940 in boost::_bi::list1<boost::_bi::value<ARDOUR::Graph*> >::operator()<boost::_mfi::mf0<void, ARDOUR::Graph>, boost::_bi::list0> (
    this=0x7fffbc2c9388, f=..., a=...) at /home/ardour/linux-x86_64-v5/gtk/inst/include/boost/bind/bind.hpp:259
#8  0x00007ffff6abad9d in boost::_bi::bind_t<void, boost::_mfi::mf0<void, ARDOUR::Graph>, boost::_bi::list1<boost::_bi::value<ARDOUR::Graph*> > >::operator() (
    this=0x7fffbc2c9378) at /home/ardour/linux-x86_64-v5/gtk/inst/include/boost/bind/bind.hpp:1294
#9  0x00007ffff6aba641 in boost::detail::function::void_function_obj_invoker0<boost::_bi::bind_t<void, boost::_mfi::mf0<void, ARDOUR::Graph>, boost::_bi::list1<boost::_bi::value<ARDOUR::Graph*> > >, void>::invoke (function_obj_ptr=...) at /home/ardour/linux-x86_64-v5/gtk/inst/include/boost/function/function_template.hpp:159
#10 0x0000555555b8ae94 in boost::function0<void>::operator() (this=0x7fffbc2c9370)
    at /home/ardour/linux-x86_64-v5/gtk/inst/include/boost/function/function_template.hpp:769
#11 0x00007fffccd1fdf7 in ARDOUR::AlsaAudioBackend::alsa_process_thread (arg=0x555558825620) at ../libs/backends/alsa/alsa_audiobackend.cc:1118
#12 0x00007fffeecc66db in start_thread (arg=0x7fffbc2c9d80) at pthread_create.c:463
---Type <return> to continue, or q <return> to quit---
#13 0x00007fffebf2388f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 27 (Thread 0x7fffbc2e3d80 (LWP 4706)):
#0  0x00007fffeeccf6d6 in futex_abstimed_wait_cancelable (private=0, abstime=0x0, expected=0, futex_word=0x55555875c740)
    at ../sysdeps/unix/sysv/linux/futex-internal.h:205
#1  do_futex_wait (sem=sem@entry=0x55555875c740, abstime=0x0) at sem_waitcommon.c:111
#2  0x00007fffeeccf7c8 in __new_sem_wait_slow (sem=0x55555875c740, abstime=0x0) at sem_waitcommon.c:181
#3  0x00007ffff6ab7f9a in PBD::Semaphore::wait (this=0x55555875c740) at ../libs/pbd/pbd/semutils.h:64
#4  0x00007ffff6ab5736 in ARDOUR::Graph::run_one (this=0x55555875c690) at ../libs/ardour/graph.cc:426
#5  0x00007ffff6ab5fd0 in ARDOUR::Graph::main_thread (this=0x55555875c690) at ../libs/ardour/graph.cc:523
#6  0x00007ffff6abc18b in boost::_mfi::mf0<void, ARDOUR::Graph>::operator() (this=0x7fffbc2e3378, p=0x55555875c690)
    at /home/ardour/linux-x86_64-v5/gtk/inst/include/boost/bind/mem_fn_template.hpp:49
#7  0x00007ffff6abb940 in boost::_bi::list1<boost::_bi::value<ARDOUR::Graph*> >::operator()<boost::_mfi::mf0<void, ARDOUR::Graph>, boost::_bi::list0> (
    this=0x7fffbc2e3388, f=..., a=...) at /home/ardour/linux-x86_64-v5/gtk/inst/include/boost/bind/bind.hpp:259
#8  0x00007ffff6abad9d in boost::_bi::bind_t<void, boost::_mfi::mf0<void, ARDOUR::Graph>, boost::_bi::list1<boost::_bi::value<ARDOUR::Graph*> > >::operator() (
    this=0x7fffbc2e3378) at /home/ardour/linux-x86_64-v5/gtk/inst/include/boost/bind/bind.hpp:1294
#9  0x00007ffff6aba641 in boost::detail::function::void_function_obj_invoker0<boost::_bi::bind_t<void, boost::_mfi::mf0<void, ARDOUR::Graph>, boost::_bi::list1<boost::_bi::value<ARDOUR::Graph*> > >, void>::invoke (function_obj_ptr=...) at /home/ardour/linux-x86_64-v5/gtk/inst/include/boost/function/function_template.hpp:159
#10 0x0000555555b8ae94 in boost::function0<void>::operator() (this=0x7fffbc2e3370)
    at /home/ardour/linux-x86_64-v5/gtk/inst/include/boost/function/function_template.hpp:769
#11 0x00007fffccd1fdf7 in ARDOUR::AlsaAudioBackend::alsa_process_thread (arg=0x55555a81dce0) at ../libs/backends/alsa/alsa_audiobackend.cc:1118
#12 0x00007fffeecc66db in start_thread (arg=0x7fffbc2e3d80) at pthread_create.c:463
#13 0x00007fffebf2388f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 26 (Thread 0x7fffbc2fdd80 (LWP 4705)):
#0  0x00007fffeeccf6d6 in futex_abstimed_wait_cancelable (private=0, abstime=0x0, expected=0, futex_word=0x55555806e0a0)
    at ../sysdeps/unix/sysv/linux/futex-internal.h:205
#1  do_futex_wait (sem=sem@entry=0x55555806e0a0, abstime=0x0) at sem_waitcommon.c:111
#2  0x00007fffeeccf7c8 in __new_sem_wait_slow (sem=0x55555806e0a0, abstime=0x0) at sem_waitcommon.c:181
#3  0x00007ffff6ab7f9a in PBD::Semaphore::wait (this=0x55555806e0a0) at ../libs/pbd/pbd/semutils.h:64
#4  0x00007ffff6f361a1 in ARDOUR::RTTaskList::run (this=0x55555806e070) at ../libs/ardour/rt_tasklist.cc:113
#5  0x00007ffff6f35f84 in ARDOUR::RTTaskList::_thread_run (arg=0x55555806e070) at ../libs/ardour/rt_tasklist.cc:67
#6  0x00007fffeecc66db in start_thread (arg=0x7fffbc2fdd80) at pthread_create.c:463
#7  0x00007fffebf2388f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 25 (Thread 0x7fffbc317d80 (LWP 4704)):
#0  0x00007fffeeccf6d6 in futex_abstimed_wait_cancelable (private=0, abstime=0x0, expected=0, futex_word=0x55555806e0a0)
    at ../sysdeps/unix/sysv/linux/futex-internal.h:205
#1  do_futex_wait (sem=sem@entry=0x55555806e0a0, abstime=0x0) at sem_waitcommon.c:111
#2  0x00007fffeeccf7c8 in __new_sem_wait_slow (sem=0x55555806e0a0, abstime=0x0) at sem_waitcommon.c:181
---Type <return> to continue, or q <return> to quit---
#3  0x00007ffff6ab7f9a in PBD::Semaphore::wait (this=0x55555806e0a0) at ../libs/pbd/pbd/semutils.h:64
#4  0x00007ffff6f361a1 in ARDOUR::RTTaskList::run (this=0x55555806e070) at ../libs/ardour/rt_tasklist.cc:113
#5  0x00007ffff6f35f84 in ARDOUR::RTTaskList::_thread_run (arg=0x55555806e070) at ../libs/ardour/rt_tasklist.cc:67
#6  0x00007fffeecc66db in start_thread (arg=0x7fffbc317d80) at pthread_create.c:463
#7  0x00007fffebf2388f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 24 (Thread 0x7fffbc331d80 (LWP 4703)):
#0  0x00007fffeeccf6d6 in futex_abstimed_wait_cancelable (private=0, abstime=0x0, expected=0, futex_word=0x55555806e0a0)
    at ../sysdeps/unix/sysv/linux/futex-internal.h:205
#1  do_futex_wait (sem=sem@entry=0x55555806e0a0, abstime=0x0) at sem_waitcommon.c:111
#2  0x00007fffeeccf7c8 in __new_sem_wait_slow (sem=0x55555806e0a0, abstime=0x0) at sem_waitcommon.c:181
#3  0x00007ffff6ab7f9a in PBD::Semaphore::wait (this=0x55555806e0a0) at ../libs/pbd/pbd/semutils.h:64
#4  0x00007ffff6f361a1 in ARDOUR::RTTaskList::run (this=0x55555806e070) at ../libs/ardour/rt_tasklist.cc:113
#5  0x00007ffff6f35f84 in ARDOUR::RTTaskList::_thread_run (arg=0x55555806e070) at ../libs/ardour/rt_tasklist.cc:67
#6  0x00007fffeecc66db in start_thread (arg=0x7fffbc331d80) at pthread_create.c:463
#7  0x00007fffebf2388f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 19 (Thread 0x7fffbedcc700 (LWP 4696)):
#0  0x00007fffebf16bf9 in __GI___poll (fds=0x7fffac003a20, nfds=1, timeout=200) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007fffccd20cd8 in ARDOUR::AlsaAudioBackend::midi_device_thread (this=0x5555572b6000) at ../libs/backends/alsa/alsa_audiobackend.cc:1319
#2  0x00007fffccd20b70 in ARDOUR::AlsaAudioBackend::_midi_device_thread (arg=0x5555572b6000) at ../libs/backends/alsa/alsa_audiobackend.cc:1282
#3  0x00007fffeecc66db in start_thread (arg=0x7fffbedcc700) at pthread_create.c:463
#4  0x00007fffebf2388f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 18 (Thread 0x7fffbc957d80 (LWP 4695)):
#0  0x00007fffebf16cf6 in __GI_ppoll (fds=0x5555578cbf54, nfds=2, timeout=<optimized out>, sigmask=0x0) at ../sysdeps/unix/sysv/linux/ppoll.c:39
#1  0x00007fffccd4ef88 in Alsa_pcmi::pcm_wait (this=0x5555578cbed0) at ../libs/backends/alsa/zita-alsa-pcmi.cc:184
#2  0x00007fffccd23506 in ARDOUR::AlsaAudioBackend::main_process_thread (this=0x5555572b6000) at ../libs/backends/alsa/alsa_audiobackend.cc:1772
#3  0x00007fffccd1da0f in pthread_process (arg=0x5555572b6000) at ../libs/backends/alsa/alsa_audiobackend.cc:734
#4  0x00007fffeecc66db in start_thread (arg=0x7fffbc957d80) at pthread_create.c:463
#5  0x00007fffebf2388f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 17 (Thread 0x7fffbd5c9700 (LWP 4694)):
#0  0x00007fffebf1903f in __GI___select (nfds=1, readfds=0x7fffbd5c6c00, writefds=0x0, exceptfds=0x0, timeout=0x7fffbd5c6c80) at ../sysdeps/unix/sysv/linux/select.c:41
#1  0x00007ffff41fbe36 in PBD::SystemExec::output_interposer (this=0x5555578b5ec0) at ../libs/pbd/system_exec.cc:995
#2  0x00007ffff41faf76 in interposer_thread (arg=0x5555578b5ec0) at ../libs/pbd/system_exec.cc:375
#3  0x00007fffeecc66db in start_thread (arg=0x7fffbd5c9700) at pthread_create.c:463
#4  0x00007fffebf2388f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 12 (Thread 0x7fffbffff700 (LWP 4688)):
---Type <return> to continue, or q <return> to quit---
#0  0x00007fffebf16bf9 in __GI___poll (fds=0x5555573743d0, nfds=2, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:29
#1  0x00007ffff2f73d66 in ?? () from /opt/Ardour-6.0.pre1.333-dbg/lib/libglib-2.0.so.0
#2  0x00007ffff2f73e7c in g_main_context_iteration () from /opt/Ardour-6.0.pre1.333-dbg/lib/libglib-2.0.so.0
#3  0x00007ffff2f73ec1 in ?? () from /opt/Ardour-6.0.pre1.333-dbg/lib/libglib-2.0.so.0
#4  0x00007ffff2fa31e5 in ?? () from /opt/Ardour-6.0.pre1.333-dbg/lib/libglib-2.0.so.0
#5  0x00007fffeecc66db in start_thread (arg=0x7fffbffff700) at pthread_create.c:463
#6  0x00007fffebf2388f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 8 (Thread 0x7fffcfb74700 (LWP 4684)):
#0  syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:38
#1  0x00007ffff2fc4e4c in g_cond_wait () from /opt/Ardour-6.0.pre1.333-dbg/lib/libglib-2.0.so.0
#2  0x00007ffff692d009 in ARDOUR::AudioEngine::do_devicelist_update (this=0x555557109530) at ../libs/ardour/audioengine.cc:678
#3  0x00007ffff6939ff7 in boost::_mfi::mf0<void, ARDOUR::AudioEngine>::operator() (this=0x555557146530, p=0x555557109530)
    at /home/ardour/linux-x86_64-v5/gtk/inst/include/boost/bind/mem_fn_template.hpp:49
#4  0x00007ffff6939a26 in boost::_bi::list1<boost::_bi::value<ARDOUR::AudioEngine*> >::operator()<boost::_mfi::mf0<void, ARDOUR::AudioEngine>, boost::_bi::list0> (
    this=0x555557146540, f=..., a=...) at /home/ardour/linux-x86_64-v5/gtk/inst/include/boost/bind/bind.hpp:259
#5  0x00007ffff6939163 in boost::_bi::bind_t<void, boost::_mfi::mf0<void, ARDOUR::AudioEngine>, boost::_bi::list1<boost::_bi::value<ARDOUR::AudioEngine*> > >::operator() (this=0x555557146530) at /home/ardour/linux-x86_64-v5/gtk/inst/include/boost/bind/bind.hpp:1294
#6  0x00007ffff6938962 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=0x555557146530) at /home/ardour/linux-x86_64-v5/gtk/inst/include/sigc++-2.0/sigc++/adaptors/adaptor_trait.h:256
#7  0x00007ffff6937b20 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=0x555557146500) at /home/ardour/linux-x86_64-v5/gtk/inst/include/sigc++-2.0/sigc++/functors/slot.h:103
#8  0x00007ffff350dc4d in ?? () from /opt/Ardour-6.0.pre1.333-dbg/lib/libglibmm-2.4.so.1
#9  0x00007ffff2fa31e5 in ?? () from /opt/Ardour-6.0.pre1.333-dbg/lib/libglib-2.0.so.0
#10 0x00007fffeecc66db in start_thread (arg=0x7fffcfb74700) at pthread_create.c:463
#11 0x00007fffebf2388f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 7 (Thread 0x7fffd5757700 (LWP 4683)):
#0  syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:38
#1  0x00007ffff2fc4e4c in g_cond_wait () from /opt/Ardour-6.0.pre1.333-dbg/lib/libglib-2.0.so.0
#2  0x00007ffff692cdd0 in ARDOUR::AudioEngine::do_reset_backend (this=0x555557109530) at ../libs/ardour/audioengine.cc:642
#3  0x00007ffff6939ff7 in boost::_mfi::mf0<void, ARDOUR::AudioEngine>::operator() (this=0x55555714c7d0, p=0x555557109530)
    at /home/ardour/linux-x86_64-v5/gtk/inst/include/boost/bind/mem_fn_template.hpp:49
#4  0x00007ffff6939a26 in boost::_bi::list1<boost::_bi::value<ARDOUR::AudioEngine*> >::operator()<boost::_mfi::mf0<void, ARDOUR::AudioEngine>, boost::_bi::list0> (
    this=0x55555714c7e0, f=..., a=...) at /home/ardour/linux-x86_64-v5/gtk/inst/include/boost/bind/bind.hpp:259
#5  0x00007ffff6939163 in boost::_bi::bind_t<void, boost::_mfi::mf0<void, ARDOUR::AudioEngine>, boost::_bi::list1<boost::_bi::value<ARDOUR::AudioEngine*> > >::operator() (this=0x55555714c7d0) at /home/ardour/linux-x86_64-v5/gtk/inst/include/boost/bind/bind.hpp:1294
#6  0x00007ffff6938962 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=0x55555714c7d0) at /home/ardour/linux-x86_64-v5/gtk/inst/include/sigc++-2.0/sigc++/adaptors/adaptor_trait.h:256
#7  0x00007ffff6937b20 in sigc::internal::slot_call0<boost::_bi::bind_t<void, boost::_mfi::mf0<void, ARDOUR::AudioEngine>, boost::_bi::list1<boost::_bi::value<ARDOUR::Au---Type <return> to continue, or q <return> to quit---
dioEngine*> > >, void>::call_it (rep=0x55555714c7a0) at /home/ardour/linux-x86_64-v5/gtk/inst/include/sigc++-2.0/sigc++/functors/slot.h:103
#8  0x00007ffff350dc4d in ?? () from /opt/Ardour-6.0.pre1.333-dbg/lib/libglibmm-2.4.so.1
#9  0x00007ffff2fa31e5 in ?? () from /opt/Ardour-6.0.pre1.333-dbg/lib/libglib-2.0.so.0
#10 0x00007fffeecc66db in start_thread (arg=0x7fffd5757700) at pthread_create.c:463
#11 0x00007fffebf2388f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 5 (Thread 0x7fffe50cc700 (LWP 4681)):
#0  syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:38
#1  0x00007ffff2fc4e4c in g_cond_wait () from /opt/Ardour-6.0.pre1.333-dbg/lib/libglib-2.0.so.0
#2  0x00007ffff68e0ef0 in ARDOUR::Analyser::work () at ../libs/ardour/analyser.cc:93
#3  0x00007ffff68e0cdc in analyser_work () at ../libs/ardour/analyser.cc:58
#4  0x00005555563f702b in sigc::pointer_functor0<void>::operator() (this=0x5555571362f8)
    at /home/ardour/linux-x86_64-v5/gtk/inst/include/sigc++-2.0/sigc++/functors/ptr_fun.h:77
#5  0x00005555563f4224 in sigc::adaptor_functor<sigc::pointer_functor0<void> >::operator() (this=0x5555571362f0)
    at /home/ardour/linux-x86_64-v5/gtk/inst/include/sigc++-2.0/sigc++/adaptors/adaptor_trait.h:256
#6  0x00005555563f01e5 in sigc::internal::slot_call0<sigc::pointer_functor0<void>, void>::call_it (rep=0x5555571362c0)
    at /home/ardour/linux-x86_64-v5/gtk/inst/include/sigc++-2.0/sigc++/functors/slot.h:103
#7  0x00007ffff350dc4d in ?? () from /opt/Ardour-6.0.pre1.333-dbg/lib/libglibmm-2.4.so.1
#8  0x00007ffff2fa31e5 in ?? () from /opt/Ardour-6.0.pre1.333-dbg/lib/libglib-2.0.so.0
#9  0x00007fffeecc66db in start_thread (arg=0x7fffe50cc700) at pthread_create.c:463
#10 0x00007fffebf2388f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 4 (Thread 0x7fffe58cd700 (LWP 4680)):
#0  syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:38
#1  0x00007ffff2fc4e4c in g_cond_wait () from /opt/Ardour-6.0.pre1.333-dbg/lib/libglib-2.0.so.0
#2  0x00007ffff707bac0 in peak_thread_work () at ../libs/ardour/source_factory.cc:74
#3  0x00005555563f702b in sigc::pointer_functor0<void>::operator() (this=0x555557136348)
    at /home/ardour/linux-x86_64-v5/gtk/inst/include/sigc++-2.0/sigc++/functors/ptr_fun.h:77
#4  0x00005555563f4224 in sigc::adaptor_functor<sigc::pointer_functor0<void> >::operator() (this=0x555557136340)
    at /home/ardour/linux-x86_64-v5/gtk/inst/include/sigc++-2.0/sigc++/adaptors/adaptor_trait.h:256
#5  0x00005555563f01e5 in sigc::internal::slot_call0<sigc::pointer_functor0<void>, void>::call_it (rep=0x555557136310)
    at /home/ardour/linux-x86_64-v5/gtk/inst/include/sigc++-2.0/sigc++/functors/slot.h:103
#6  0x00007ffff350dc4d in ?? () from /opt/Ardour-6.0.pre1.333-dbg/lib/libglibmm-2.4.so.1
#7  0x00007ffff2fa31e5 in ?? () from /opt/Ardour-6.0.pre1.333-dbg/lib/libglib-2.0.so.0
#8  0x00007fffeecc66db in start_thread (arg=0x7fffe58cd700) at pthread_create.c:463
#9  0x00007fffebf2388f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 3 (Thread 0x7fffe60ce700 (LWP 4679)):
#0  syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:38
#1  0x00007ffff2fc4e4c in g_cond_wait () from /opt/Ardour-6.0.pre1.333-dbg/lib/libglib-2.0.so.0
---Type <return> to continue, or q <return> to quit---
#2  0x00007ffff707bac0 in peak_thread_work () at ../libs/ardour/source_factory.cc:74
#3  0x00005555563f702b in sigc::pointer_functor0<void>::operator() (this=0x5555570f9508)
    at /home/ardour/linux-x86_64-v5/gtk/inst/include/sigc++-2.0/sigc++/functors/ptr_fun.h:77
#4  0x00005555563f4224 in sigc::adaptor_functor<sigc::pointer_functor0<void> >::operator() (this=0x5555570f9500)
    at /home/ardour/linux-x86_64-v5/gtk/inst/include/sigc++-2.0/sigc++/adaptors/adaptor_trait.h:256
#5  0x00005555563f01e5 in sigc::internal::slot_call0<sigc::pointer_functor0<void>, void>::call_it (rep=0x5555570f94d0)
    at /home/ardour/linux-x86_64-v5/gtk/inst/include/sigc++-2.0/sigc++/functors/slot.h:103
#6  0x00007ffff350dc4d in ?? () from /opt/Ardour-6.0.pre1.333-dbg/lib/libglibmm-2.4.so.1
#7  0x00007ffff2fa31e5 in ?? () from /opt/Ardour-6.0.pre1.333-dbg/lib/libglib-2.0.so.0
#8  0x00007fffeecc66db in start_thread (arg=0x7fffe60ce700) at pthread_create.c:463
#9  0x00007fffebf2388f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 2 (Thread 0x7fffe68cf700 (LWP 4678)):
#0  0x00007fffeecd0c60 in __GI___nanosleep (requested_time=0x7fffe68cebf0, remaining=0x7fffe68cec00) at ../sysdeps/unix/sysv/linux/nanosleep.c:28
#1  0x00007ffff2fa4a38 in g_usleep () from /opt/Ardour-6.0.pre1.333-dbg/lib/libglib-2.0.so.0
#2  0x00005555567706aa in gui_event_loop (ptr=0x0) at ../gtk2_ardour/linux_vst_gui_support.cc:463
#3  0x00007fffeecc66db in start_thread (arg=0x7fffe68cf700) at pthread_create.c:463
#4  0x00007fffebf2388f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

Thread 1 (Thread 0x7ffff7fac900 (LWP 4674)):
#0  __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:51
#1  0x00007fffebe42801 in __GI_abort () at abort.c:79
#2  0x00007fffebe3239a in __assert_fail_base (fmt=0x7fffebfb97d8 "%s%s%s:%u: %s%sAssertion `%s' failed.\n%n", 
    assertion=assertion@entry=0x55555682be18 "fi == features_count + (is_external_ui ? 3 : 1)", file=file@entry=0x55555682bd30 "../gtk2_ardour/lv2_plugin_ui.cc", 
    line=line@entry=393, 
    function=function@entry=0x55555682c2e0 <LV2PluginUI::lv2ui_instantiate(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)::__PRETTY_FUNCTION__> "void LV2PluginUI::lv2ui_instantiate(const string&)") at assert.c:92
#3  0x00007fffebe32412 in __GI___assert_fail (assertion=0x55555682be18 "fi == features_count + (is_external_ui ? 3 : 1)", 
    file=0x55555682bd30 "../gtk2_ardour/lv2_plugin_ui.cc", line=393, 
    function=0x55555682c2e0 <LV2PluginUI::lv2ui_instantiate(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)::__PRETTY_FUNCTION__> "void LV2PluginUI::lv2ui_instantiate(const string&)") at assert.c:101
#4  0x000055555676a7e9 in LV2PluginUI::lv2ui_instantiate (this=0x555558c6b4c0, title="gtk2gui") at ../gtk2_ardour/lv2_plugin_ui.cc:393
#5  0x000055555676bf35 in LV2PluginUI::on_window_show (this=0x555558c6b4c0, title="73 LV Dbl L: XT-VC Vocal Character (Mono) (by Harrison Consoles)")
    at ../gtk2_ardour/lv2_plugin_ui.cc:632
#6  0x000055555636f603 in PluginUIWindow::on_show (this=0x555558c54000) at ../gtk2_ardour/plugin_ui.cc:206
#7  0x00007ffff057aded in Gtk::Widget_Class::show_callback(_GtkWidget*) () from /opt/Ardour-6.0.pre1.333-dbg/lib/libgtkmm-2.4.so.1
#8  0x00007ffff3282b74 in ?? () from /opt/Ardour-6.0.pre1.333-dbg/lib/libgobject-2.0.so.0
#9  0x00007ffff329d904 in g_signal_emit_valist () from /opt/Ardour-6.0.pre1.333-dbg/lib/libgobject-2.0.so.0
#10 0x00007ffff329e082 in g_signal_emit () from /opt/Ardour-6.0.pre1.333-dbg/lib/libgobject-2.0.so.0
#11 0x00007ffff26f6c96 in gtk_widget_show () from /opt/Ardour-6.0.pre1.333-dbg/lib/libgtk-x11-2.0.so.0
---Type <return> to continue, or q <return> to quit---
#12 0x00007ffff24bac55 in ?? () from /opt/Ardour-6.0.pre1.333-dbg/lib/libgtk-x11-2.0.so.0
#13 0x00007ffff057acc5 in Gtk::Widget_Class::show_all_vfunc_callback(_GtkWidget*) () from /opt/Ardour-6.0.pre1.333-dbg/lib/libgtkmm-2.4.so.1
#14 0x00005555563dd808 in ProcessorWindowProxy::get (this=0x555557fead90, create=true) at ../gtk2_ardour/processor_box.cc:4437
#15 0x00007ffff45b5f94 in Gtkmm2ext::WindowProxy::toggle (this=0x555557feadc8) at ../libs/gtkmm2ext/window_proxy.cc:134
#16 0x00005555563dd91c in ProcessorWindowProxy::show_the_right_window (this=0x555557fead90, show_not_toggle=false) at ../gtk2_ardour/processor_box.cc:4454
#17 0x00005555563db462 in ProcessorBox::edit_processor (this=0x555562b3b208, processor=...) at ../gtk2_ardour/processor_box.cc:4136
#18 0x00005555563d0d5f in ProcessorBox::use_plugins (this=0x555562b3b208, plugins=std::vector of length 1, capacity 1 = {...}) at ../gtk2_ardour/processor_box.cc:2569
#19 0x0000555556361d92 in PluginSelector::plugin_chosen_from_menu (this=0x555558037000, pi=...) at ../gtk2_ardour/plugin_selector.cc:1174
#20 0x000055555636c61d in sigc::bound_mem_functor1<void, PluginSelector, boost::shared_ptr<ARDOUR::PluginInfo> const&>::operator() (this=0x5555581591d0, _A_a1=...)
    at /home/ardour/linux-x86_64-v5/gtk/inst/include/sigc++-2.0/sigc++/functors/mem_fun.h:1856
#21 0x000055555636b459 in sigc::adaptor_functor<sigc::bound_mem_functor1<void, PluginSelector, boost::shared_ptr<ARDOUR::PluginInfo> const&> >::operator()<boost::shared_ptr<ARDOUR::PluginInfo>&> (this=0x5555581591c8, _A_arg1=...) at /home/ardour/linux-x86_64-v5/gtk/inst/include/sigc++-2.0/sigc++/adaptors/adaptor_trait.h:89
#22 0x000055555636a082 in sigc::bind_functor<-1, sigc::bound_mem_functor1<void, PluginSelector, boost::shared_ptr<ARDOUR::PluginInfo> const&>, boost::shared_ptr<ARDOUR::PluginInfo>, sigc::nil, sigc::nil, sigc::nil, sigc::nil, sigc::nil, sigc::nil>::operator() (this=0x5555581591c0)
    at /home/ardour/linux-x86_64-v5/gtk/inst/include/sigc++-2.0/sigc++/adaptors/bind.h:1123
#23 0x00005555563687cf in sigc::internal::slot_call0<sigc::bind_functor<-1, sigc::bound_mem_functor1<void, PluginSelector, boost::shared_ptr<ARDOUR::PluginInfo> const&>, boost::shared_ptr<ARDOUR::PluginInfo>, sigc::nil, sigc::nil, sigc::nil, sigc::nil, sigc::nil, sigc::nil>, void>::call_it (rep=0x555558159190)
    at /home/ardour/linux-x86_64-v5/gtk/inst/include/sigc++-2.0/sigc++/functors/slot.h:103
#24 0x00007ffff351cc88 in Glib::SignalProxyNormal::slot0_void_callback(_GObject*, void*) () from /opt/Ardour-6.0.pre1.333-dbg/lib/libglibmm-2.4.so.1
#25 0x00007ffff3282945 in g_closure_invoke () from /opt/Ardour-6.0.pre1.333-dbg/lib/libgobject-2.0.so.0
#26 0x00007ffff329401b in ?? () from /opt/Ardour-6.0.pre1.333-dbg/lib/libgobject-2.0.so.0
#27 0x00007ffff329dc30 in g_signal_emit_valist () from /opt/Ardour-6.0.pre1.333-dbg/lib/libgobject-2.0.so.0
#28 0x00007ffff329e082 in g_signal_emit () from /opt/Ardour-6.0.pre1.333-dbg/lib/libgobject-2.0.so.0
#29 0x00007ffff26ec1fe in gtk_widget_activate () from /opt/Ardour-6.0.pre1.333-dbg/lib/libgtk-x11-2.0.so.0
#30 0x00007ffff25827a2 in gtk_menu_shell_activate_item () from /opt/Ardour-6.0.pre1.333-dbg/lib/libgtk-x11-2.0.so.0
#31 0x00007ffff2582bf6 in ?? () from /opt/Ardour-6.0.pre1.333-dbg/lib/libgtk-x11-2.0.so.0
#32 0x00007ffff25747f6 in ?? () from /opt/Ardour-6.0.pre1.333-dbg/lib/libgtk-x11-2.0.so.0
#33 0x00007ffff2568cac in ?? () from /opt/Ardour-6.0.pre1.333-dbg/lib/libgtk-x11-2.0.so.0
#34 0x00007ffff3282945 in g_closure_invoke () from /opt/Ardour-6.0.pre1.333-dbg/lib/libgobject-2.0.so.0
#35 0x00007ffff32945a0 in ?? () from /opt/Ardour-6.0.pre1.333-dbg/lib/libgobject-2.0.so.0
#36 0x00007ffff329d69b in g_signal_emit_valist () from /opt/Ardour-6.0.pre1.333-dbg/lib/libgobject-2.0.so.0
#37 0x00007ffff329e082 in g_signal_emit () from /opt/Ardour-6.0.pre1.333-dbg/lib/libgobject-2.0.so.0
#38 0x00007ffff26ed64c in ?? () from /opt/Ardour-6.0.pre1.333-dbg/lib/libgtk-x11-2.0.so.0
#39 0x00007ffff256729d in gtk_propagate_event () from /opt/Ardour-6.0.pre1.333-dbg/lib/libgtk-x11-2.0.so.0
#40 0x00007ffff2567723 in gtk_main_do_event () from /opt/Ardour-6.0.pre1.333-dbg/lib/libgtk-x11-2.0.so.0
#41 0x00007ffff2183b5c in ?? () from /opt/Ardour-6.0.pre1.333-dbg/lib/libgdk-x11-2.0.so.0
#42 0x00007ffff2f73b67 in g_main_context_dispatch () from /opt/Ardour-6.0.pre1.333-dbg/lib/libglib-2.0.so.0
#43 0x00007ffff2f73dd0 in ?? () from /opt/Ardour-6.0.pre1.333-dbg/lib/libglib-2.0.so.0
#44 0x00007ffff2f740f2 in g_main_loop_run () from /opt/Ardour-6.0.pre1.333-dbg/lib/libglib-2.0.so.0
#45 0x00007ffff25663e7 in gtk_main () from /opt/Ardour-6.0.pre1.333-dbg/lib/libgtk-x11-2.0.so.0
---Type <return> to continue, or q <return> to quit---
#46 0x00007ffff458d0b2 in Gtkmm2ext::UI::run (this=0x55555756f800, old_receiver=...) at ../libs/gtkmm2ext/gtk_ui.cc:290
#47 0x000055555612ec95 in main (argc=1, argv=0x7fffffffd218) at ../gtk2_ardour/main.cc:435
(gdb)