Core was generated by `/usr/lib/ardour5/ardour-5.12.0'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0  0x00007fcb9fd3927f in g_type_check_instance_is_fundamentally_a () from /usr/lib/libgobject-2.0.so.0
[Current thread is 1 (Thread 0x7fcba2cf5940 (LWP 1468))]
(gdb) thread apply all bt

Thread 24 (Thread 0x7fcb8e39f700 (LWP 1483)):
#0  0x00007fcb9c987260 in nanosleep () at /usr/lib/libpthread.so.0
#1  0x00007fcb9fa60471 in g_usleep () at /usr/lib/libglib-2.0.so.0
#2  0x000055580f1cce5e in  ()
#3  0x00007fcb9c97d08c in start_thread () at /usr/lib/libpthread.so.0
#4  0x00007fcb9b309e7f in clone () at /usr/lib/libc.so.6

Thread 23 (Thread 0x7fcb75b7e700 (LWP 1493)):
#0  0x00007fcb9b2ff97b in poll () at /usr/lib/libc.so.6
#1  0x00007fcb9fa36613 in  () at /usr/lib/libglib-2.0.so.0
#2  0x00007fcb9fa3672e in g_main_context_iteration () at /usr/lib/libglib-2.0.so.0
#3  0x00007fcb9fa36782 in  () at /usr/lib/libglib-2.0.so.0
#4  0x00007fcb9fa5ecea in  () at /usr/lib/libglib-2.0.so.0
#5  0x00007fcb9c97d08c in start_thread () at /usr/lib/libpthread.so.0
#6  0x00007fcb9b309e7f in clone () at /usr/lib/libc.so.6

Thread 22 (Thread 0x7fcb57fff700 (LWP 1564)):
#0  0x00007fcb9c9833bd in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007fcba1f1c7ed in ARDOUR::Session::auto_connect_thread_run() () at /usr/lib/ardour5/libardour.so.3
#2  0x00007fcba1f1c90a in ARDOUR::Session::auto_connect_thread(void*) () at /usr/lib/ardour5/libardour.so.3
#3  0x00007fcb9c97d08c in start_thread () at /usr/lib/libpthread.so.0
#4  0x00007fcb9b309e7f in clone () at /usr/lib/libc.so.6

Thread 21 (Thread 0x7fcb7606c700 (LWP 1532)):
#0  0x00007fcb9c986988 in read () at /usr/lib/libpthread.so.0
#1  0x00007fcb7cad970f in  () at /usr/lib/libjack.so.0
#2  0x00007fcb7cadce21 in  () at /usr/lib/libjack.so.0
#3  0x00007fcb7cad8446 in  () at /usr/lib/libjack.so.0
#4  0x00007fcb9c97d08c in start_thread () at /usr/lib/libpthread.so.0
#5  0x00007fcb9b309e7f in clone () at /usr/lib/libc.so.6

Thread 20 (Thread 0x7fcb7537d700 (LWP 1494)):
#0  0x00007fcb9b2ff97b in poll () at /usr/lib/libc.so.6
#1  0x00007fcb9fa36613 in  () at /usr/lib/libglib-2.0.so.0
#2  0x00007fcb9fa369d2 in g_main_loop_run () at /usr/lib/libglib-2.0.so.0
#3  0x00007fcb9816bb78 in  () at /usr/lib/libgio-2.0.so.0
#4  0x00007fcb9fa5ecea in  () at /usr/lib/libglib-2.0.so.0
#5  0x00007fcb9c97d08c in start_thread () at /usr/lib/libpthread.so.0
#6  0x00007fcb9b309e7f in clone () at /usr/lib/libc.so.6

Thread 19 (Thread 0x7fcb577fe700 (LWP 1563)):
#0  0x00007fcb9c9833bd in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007fcba1f8ddc5 in ARDOUR::Session::emit_thread_run() () at /usr/lib/ardour5/libardour.so.3
#2  0x00007fcba1f8ddea in ARDOUR::Session::emit_thread(void*) () at /usr/lib/ardour5/libardour.so.3
#3  0x00007fcb9c97d08c in start_thread () at /usr/lib/libpthread.so.0
#4  0x00007fcb9b309e7f in clone () at /usr/lib/libc.so.6

Thread 18 (Thread 0x7fcb7dc26700 (LWP 1488)):
#0  0x00007fcb9b304879 in syscall () at /usr/lib/libc.so.6
#1  0x00007fcb9fa7d6d1 in g_cond_wait () at /usr/lib/libglib-2.0.so.0
#2  0x00007fcba1af7244 in ARDOUR::AudioEngine::do_devicelist_update() () at /usr/lib/ardour5/libardour.so.3
#3  0x00007fcb9ffa3cbd in  () at /usr/lib/libglibmm-2.4.so.1
#4  0x00007fcb9fa5ecea in  () at /usr/lib/libglib-2.0.so.0
#5  0x00007fcb9c97d08c in start_thread () at /usr/lib/libpthread.so.0
#6  0x00007fcb9b309e7f in clone () at /usr/lib/libc.so.6

Thread 17 (Thread 0x7fcb760ed700 (LWP 1531)):
#0  0x00007fcb9c9833bd in pthread_cond_wait@@GLIBC_2.3.2 () at /usr/lib/libpthread.so.0
#1  0x00007fcb7cad8e1e in  () at /usr/lib/libjack.so.0
#2  0x00007fcb7cad0686 in  () at /usr/lib/libjack.so.0
#3  0x00007fcb7cad8446 in  () at /usr/lib/libjack.so.0
#4  0x00007fcb9c97d08c in start_thread () at /usr/lib/libpthread.so.0
#5  0x00007fcb9b309e7f in clone () at /usr/lib/libc.so.6

Thread 16 (Thread 0x7fcb8d39d700 (LWP 1485)):
#0  0x00007fcb9b304879 in syscall () at /usr/lib/libc.so.6
#1  0x00007fcb9fa7d6d1 in g_cond_wait () at /usr/lib/libglib-2.0.so.0
#2  0x00007fcba1fffef0 in  () at /usr/lib/ardour5/libardour.so.3
#3  0x00007fcb9ffa3cbd in  () at /usr/lib/libglibmm-2.4.so.1
#4  0x00007fcb9fa5ecea in  () at /usr/lib/libglib-2.0.so.0
#5  0x00007fcb9c97d08c in start_thread () at /usr/lib/libpthread.so.0
#6  0x00007fcb9b309e7f in clone () at /usr/lib/libc.so.6

Thread 15 (Thread 0x7fcb8db9e700 (LWP 1484)):
#0  0x00007fcb9b304879 in syscall () at /usr/lib/libc.so.6
#1  0x00007fcb9fa7d6d1 in g_cond_wait () at /usr/lib/libglib-2.0.so.0
#2  0x00007fcba1fffef0 in  () at /usr/lib/ardour5/libardour.so.3
#3  0x00007fcb9ffa3cbd in  () at /usr/lib/libglibmm-2.4.so.1
#4  0x00007fcb9fa5ecea in  () at /usr/lib/libglib-2.0.so.0
#5  0x00007fcb9c97d08c in start_thread () at /usr/lib/libpthread.so.0
#6  0x00007fcb9b309e7f in clone () at /usr/lib/libc.so.6

Thread 14 (Thread 0x7fcb683ee700 (LWP 1545)):
#0  0x00007fcb9c985cf6 in do_futex_wait.constprop () at /usr/lib/libpthread.so.0
#1  0x00007fcb9c985de8 in __new_sem_wait_slow.constprop.0 () at /usr/lib/libpthread.so.0
#2  0x00007fcba1c12bba in ARDOUR::Graph::run_one() () at /usr/lib/ardour5/libardour.so.3
#3  0x00007fcba1c12c99 in ARDOUR::Graph::helper_thread() () at /usr/lib/ardour5/libardour.so.3
#4  0x00007fcb7d206c2f in ARDOUR::JACKAudioBackend::_start_process_thread(void*) ()
    at /usr/lib/ardour5/backends/libjack_audiobackend.so
#5  0x00007fcb9c97d08c in start_thread () at /usr/lib/libpthread.so.0
#6  0x00007fcb9b309e7f in clone () at /usr/lib/libc.so.6

Thread 13 (Thread 0x7fcb31ca6800 (LWP 1561)):
#0  0x00007fcb9b2ff97b in poll () at /usr/lib/libc.so.6
#1  0x00007fcba0652cee in CrossThreadChannel::poll_for_request() () at /usr/lib/ardour5/libpbd.so.4
#2  0x00007fcba0652d6b in CrossThreadChannel::receive(char&, bool) () at /usr/lib/ardour5/libpbd.so.4
#3  0x00007fcba1b509af in ARDOUR::Butler::thread_work() () at /usr/lib/ardour5/libardour.so.3
#4  0x00007fcba1b51173 in ARDOUR::Butler::_thread_work(void*) () at /usr/lib/ardour5/libardour.so.3
#5  0x00007fcba067c529 in  () at /usr/lib/ardour5/libpbd.so.4
#6  0x00007fcb9c97d08c in start_thread () at /usr/lib/libpthread.so.0
#7  0x00007fcb9b309e7f in clone () at /usr/lib/libc.so.6

Thread 12 (Thread 0x7fcb6846f700 (LWP 1544)):
#0  0x00007fcb9c985cf6 in do_futex_wait.constprop () at /usr/lib/libpthread.so.0
#1  0x00007fcb9c985de8 in __new_sem_wait_slow.constprop.0 () at /usr/lib/libpthread.so.0
#2  0x00007fcba1c12bba in ARDOUR::Graph::run_one() () at /usr/lib/ardour5/libardour.so.3
#3  0x00007fcba1c12c99 in ARDOUR::Graph::helper_thread() () at /usr/lib/ardour5/libardour.so.3
#4  0x00007fcb7d206c2f in ARDOUR::JACKAudioBackend::_start_process_thread(void*) ()
    at /usr/lib/ardour5/backends/libjack_audiobackend.so
#5  0x00007fcb9c97d08c in start_thread () at /usr/lib/libpthread.so.0
#6  0x00007fcb9b309e7f in clone () at /usr/lib/libc.so.6

Thread 11 (Thread 0x7fcb7e427700 (LWP 1487)):
#0  0x00007fcb9b304879 in syscall () at /usr/lib/libc.so.6
#1  0x00007fcb9fa7d6d1 in g_cond_wait () at /usr/lib/libglib-2.0.so.0
#2  0x00007fcba1af9010 in ARDOUR::AudioEngine::do_reset_backend() () at /usr/lib/ardour5/libardour.so.3
#3  0x00007fcb9ffa3cbd in  () at /usr/lib/libglibmm-2.4.so.1
#4  0x00007fcb9fa5ecea in  () at /usr/lib/libglib-2.0.so.0
#5  0x00007fcb9c97d08c in start_thread () at /usr/lib/libpthread.so.0
#6  0x00007fcb9b309e7f in clone () at /usr/lib/libc.so.6

Thread 10 (Thread 0x7fcb682ec700 (LWP 1556)):
#0  0x00007fcb9c985cf6 in do_futex_wait.constprop () at /usr/lib/libpthread.so.0
#1  0x00007fcb9c985de8 in __new_sem_wait_slow.constprop.0 () at /usr/lib/libpthread.so.0
#2  0x00007fcba1c12bba in ARDOUR::Graph::run_one() () at /usr/lib/ardour5/libardour.so.3
#3  0x00007fcba1c12c99 in ARDOUR::Graph::helper_thread() () at /usr/lib/ardour5/libardour.so.3
#4  0x00007fcb7d206c2f in ARDOUR::JACKAudioBackend::_start_process_thread(void*) ()
    at /usr/lib/ardour5/backends/libjack_audiobackend.so
#5  0x00007fcb9c97d08c in start_thread () at /usr/lib/libpthread.so.0
#6  0x00007fcb9b309e7f in clone () at /usr/lib/libc.so.6

Thread 9 (Thread 0x7fcb8cb9c700 (LWP 1486)):
#0  0x00007fcb9b304879 in syscall () at /usr/lib/libc.so.6
#1  0x00007fcb9fa7d6d1 in g_cond_wait () at /usr/lib/libglib-2.0.so.0
#2  0x00007fcba1aa7b50 in ARDOUR::Analyser::work() () at /usr/lib/ardour5/libardour.so.3
#3  0x00007fcb9ffa3cbd in  () at /usr/lib/libglibmm-2.4.so.1
#4  0x00007fcb9fa5ecea in  () at /usr/lib/libglib-2.0.so.0
#5  0x00007fcb9c97d08c in start_thread () at /usr/lib/libpthread.so.0
#6  0x00007fcb9b309e7f in clone () at /usr/lib/libc.so.6

Thread 8 (Thread 0x7fcb684f0700 (LWP 1543)):
#0  0x00007fcb9c985cf6 in do_futex_wait.constprop () at /usr/lib/libpthread.so.0
#1  0x00007fcb9c985de8 in __new_sem_wait_slow.constprop.0 () at /usr/lib/libpthread.so.0
#2  0x00007fcba1c12bba in ARDOUR::Graph::run_one() () at /usr/lib/ardour5/libardour.so.3
#3  0x00007fcba1c12c99 in ARDOUR::Graph::helper_thread() () at /usr/lib/ardour5/libardour.so.3
#4  0x00007fcb7d206c2f in ARDOUR::JACKAudioBackend::_start_process_thread(void*) ()
    at /usr/lib/ardour5/backends/libjack_audiobackend.so
#5  0x00007fcb9c97d08c in start_thread () at /usr/lib/libpthread.so.0
#6  0x00007fcb9b309e7f in clone () at /usr/lib/libc.so.6

Thread 7 (Thread 0x7fcb685f2700 (LWP 1541)):
#0  0x00007fcb9c985cf6 in do_futex_wait.constprop () at /usr/lib/libpthread.so.0
#1  0x00007fcb9c985de8 in __new_sem_wait_slow.constprop.0 () at /usr/lib/libpthread.so.0
#2  0x00007fcba1c12aac in ARDOUR::Graph::restart_cycle() () at /usr/lib/ardour5/libardour.so.3
#3  0x00007fcba1c12c16 in ARDOUR::Graph::run_one() () at /usr/lib/ardour5/libardour.so.3
#4  0x00007fcba1c12d96 in ARDOUR::Graph::main_thread() () at /usr/lib/ardour5/libardour.so.3
#5  0x00007fcb7d206c2f in ARDOUR::JACKAudioBackend::_start_process_thread(void*) ()
    at /usr/lib/ardour5/backends/libjack_audiobackend.so
#6  0x00007fcb9c97d08c in start_thread () at /usr/lib/libpthread.so.0
#7  0x00007fcb9b309e7f in clone () at /usr/lib/libc.so.6

Thread 6 (Thread 0x7fcb6b667700 (LWP 1533)):
#0  0x00007fcb9b304879 in syscall () at /usr/lib/libc.so.6
#1  0x00007fcb7cada309 in  () at /usr/lib/libjack.so.0
#2  0x00007fcb7cac15d5 in  () at /usr/lib/libjack.so.0
#3  0x00007fcb7cabff49 in  () at /usr/lib/libjack.so.0
#4  0x00007fcb7d20607c in ARDOUR::JACKAudioBackend::process_thread() () at /usr/lib/ardour5/backends/libjack_audiobackend.so
#5  0x00007fcb7cabfeaa in  () at /usr/lib/libjack.so.0
#6  0x00007fcb7cad8446 in  () at /usr/lib/libjack.so.0
#7  0x00007fcb9c97d08c in start_thread () at /usr/lib/libpthread.so.0
#8  0x00007fcb9b309e7f in clone () at /usr/lib/libc.so.6

Thread 5 (Thread 0x7fcb6a7fc700 (LWP 1565)):
#0  0x00007fcb9c987260 in nanosleep () at /usr/lib/libpthread.so.0
#1  0x00007fcb9fa60471 in g_usleep () at /usr/lib/libglib-2.0.so.0
#2  0x00007fcba1b3fb69 in ARDOUR::AutomationWatch::thread() () at /usr/lib/ardour5/libardour.so.3
#3  0x00007fcb9ffa3cbd in  () at /usr/lib/libglibmm-2.4.so.1
#4  0x00007fcb9fa5ecea in  () at /usr/lib/libglib-2.0.so.0
#5  0x00007fcb9c97d08c in start_thread () at /usr/lib/libpthread.so.0
#6  0x00007fcb9b309e7f in clone () at /usr/lib/libc.so.6

Thread 4 (Thread 0x7fcb68571700 (LWP 1542)):
#0  0x00007fcb9c985cf6 in do_futex_wait.constprop () at /usr/lib/libpthread.so.0
#1  0x00007fcb9c985de8 in __new_sem_wait_slow.constprop.0 () at /usr/lib/libpthread.so.0
#2  0x00007fcba1c12bba in ARDOUR::Graph::run_one() () at /usr/lib/ardour5/libardour.so.3
#3  0x00007fcba1c12c99 in ARDOUR::Graph::helper_thread() () at /usr/lib/ardour5/libardour.so.3
#4  0x00007fcb7d206c2f in ARDOUR::JACKAudioBackend::_start_process_thread(void*) ()
    at /usr/lib/ardour5/backends/libjack_audiobackend.so
#5  0x00007fcb9c97d08c in start_thread () at /usr/lib/libpthread.so.0
#6  0x00007fcb9b309e7f in clone () at /usr/lib/libc.so.6

Thread 3 (Thread 0x7fcb31b42700 (LWP 1562)):
#0  0x00007fcb9b2ff97b in poll () at /usr/lib/libc.so.6
#1  0x00007fcb9fa36613 in  () at /usr/lib/libglib-2.0.so.0
#2  0x00007fcb9fa369d2 in g_main_loop_run () at /usr/lib/libglib-2.0.so.0
#3  0x00007fcba0647e74 in BaseUI::main_thread() () at /usr/lib/ardour5/libpbd.so.4
#4  0x00007fcb9ffa3cbd in  () at /usr/lib/libglibmm-2.4.so.1
#5  0x00007fcb9fa5ecea in  () at /usr/lib/libglib-2.0.so.0
#6  0x00007fcb9c97d08c in start_thread () at /usr/lib/libpthread.so.0
#7  0x00007fcb9b309e7f in clone () at /usr/lib/libc.so.6

Thread 2 (Thread 0x7fcb6836d700 (LWP 1546)):
#0  0x00007fcb9c985cf6 in do_futex_wait.constprop () at /usr/lib/libpthread.so.0
#1  0x00007fcb9c985de8 in __new_sem_wait_slow.constprop.0 () at /usr/lib/libpthread.so.0
#2  0x00007fcba1c12bba in ARDOUR::Graph::run_one() () at /usr/lib/ardour5/libardour.so.3
#3  0x00007fcba1c12c99 in ARDOUR::Graph::helper_thread() () at /usr/lib/ardour5/libardour.so.3
#4  0x00007fcb7d206c2f in ARDOUR::JACKAudioBackend::_start_process_thread(void*) ()
    at /usr/lib/ardour5/backends/libjack_audiobackend.so
#5  0x00007fcb9c97d08c in start_thread () at /usr/lib/libpthread.so.0
#6  0x00007fcb9b309e7f in clone () at /usr/lib/libc.so.6

Thread 1 (Thread 0x7fcba2cf5940 (LWP 1468)):
#0  0x00007fcb9fd3927f in g_type_check_instance_is_fundamentally_a () at /usr/lib/libgobject-2.0.so.0
#1  0x00007fcb9fd16b1f in g_object_ref () at /usr/lib/libgobject-2.0.so.0
#2  0x00007fcb9f2d8125 in  () at /usr/lib/libgtk-x11-2.0.so.0
#3  0x00007fcb9f2d47cc in  () at /usr/lib/libgtk-x11-2.0.so.0
#4  0x00007fcb9fd11c2d in g_closure_invoke () at /usr/lib/libgobject-2.0.so.0
#5  0x00007fcb9fd25bb0 in  () at /usr/lib/libgobject-2.0.so.0
#6  0x00007fcb9fd2e0d1 in g_signal_emit_valist () at /usr/lib/libgobject-2.0.so.0
#7  0x00007fcb9fd2f180 in g_signal_emit () at /usr/lib/libgobject-2.0.so.0
#8  0x00007fcb9f3ef153 in  () at /usr/lib/libgtk-x11-2.0.so.0
#9  0x00007fcb9f2d2f1b in gtk_main_do_event () at /usr/lib/libgtk-x11-2.0.so.0
#10 0x00007fcb9ef4bd5e in  () at /usr/lib/libgdk-x11-2.0.so.0
#11 0x00007fcb9fa36458 in g_main_context_dispatch () at /usr/lib/libglib-2.0.so.0
#12 0x00007fcb9fa366a1 in  () at /usr/lib/libglib-2.0.so.0
#13 0x00007fcb9fa369d2 in g_main_loop_run () at /usr/lib/libglib-2.0.so.0
#14 0x00007fcb9f2d1df3 in gtk_main () at /usr/lib/libgtk-x11-2.0.so.0
#15 0x00007fcba0915fc3 in Gtkmm2ext::UI::run(Receiver&) () at /usr/lib/ardour5/libgtkmm2ext.so.0
#16 0x000055580e950afd in  ()
#17 0x00007fcb9b234f4a in __libc_start_main () at /usr/lib/libc.so.6
#18 0x000055580e95571a in  ()
