Description of problem:
Switching from Alsa to Jack

Version-Release number of selected component:
ardour7-7.4.0-1.fc38

Additional info:
reporter:       libreport-2.17.10
type:           CCpp
reason:         ardour-7.4.0 killed by SIGABRT
journald_cursor: s=d0bd146835154a04b819fd868cc1275d;i=301189;b=d5f0cc0aa2b34173a10fcdfd64fb6aed;m=186f174bd;t=5fd8f4bbc8bd4;x=da275be59d6b6e46
executable:     /usr/lib64/ardour7/ardour-7.4.0
cmdline:        /usr/lib64/ardour7/ardour-7.4.0
cgroup:         0::/user.slice/user-1000.slice/user/app.slice/app-gnome-ardour7-9050.scope
rootdir:        /
uid:            1000
kernel:         6.3.5-200.fc38.x86_64
package:        ardour7-7.4.0-1.fc38
runlevel:       N 5
dso_list:       /usr/lib64/ardour7/ardour-7.4.0 ardour7-7.4.0-1.fc38.x86_64 (Fedora Project) 1684400231
backtrace_rating: 4
crash_function: std::__glibcxx_assert_fail
comment:        Switching from Alsa to Jack

Truncated backtrace:
Thread no. 1 (20 frames)
 #4 std::__glibcxx_assert_fail at ../../../../../libstdc++-v3/src/c++11/debug.cc:61
 #5 std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >::front at /usr/include/c++/13/bits/stl_vector.h:1204
 #7 IOButtonBase::set_label at ../gtk2_ardour/io_button.cc:378
 #8 IOButton::update at ../libs/ardour/ardour/session_object.h:58
 #9 IOButton::port_connected_or_disconnected at ../gtk2_ardour/io_button.cc:487
 #10 boost::_mfi::mf2<void, IOButton, std::weak_ptr<ARDOUR::Port>, std::weak_ptr<ARDOUR::Port> >::operator() at /usr/include/boost/bind/mem_fn_template.hpp:280
 #11 boost::_bi::list3<boost::_bi::value<IOButton*>, boost::arg<1>, boost::arg<3> >::operator()<boost::_mfi::mf2<void, IOButton, std::weak_ptr<ARDOUR::Port>, std::weak_ptr<ARDOUR::Port> >, boost::_bi::rrlist5<std::weak_ptr<ARDOUR::Port>, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::weak_ptr<ARDOUR::Port>, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, bool> > at /usr/include/boost/bind/bind.hpp:377
 #12 boost::_bi::bind_t<void, boost::_mfi::mf2<void, IOButton, std::weak_ptr<ARDOUR::Port>, std::weak_ptr<ARDOUR::Port> >, boost::_bi::list3<boost::_bi::value<IOButton*>, boost::arg<1>, boost::arg<3> > >::operator()<std::weak_ptr<ARDOUR::Port>, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::weak_ptr<ARDOUR::Port>, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, bool> at /usr/include/boost/bind/bind.hpp:1333
 #13 boost::detail::function::void_function_obj_invoker5<boost::_bi::bind_t<void, boost::_mfi::mf2<void, IOButton, std::weak_ptr<ARDOUR::Port>, std::weak_ptr<ARDOUR::Port> >, boost::_bi::list3<boost::_bi::value<IOButton*>, boost::arg<1>, boost::arg<3> > >, void, std::weak_ptr<ARDOUR::Port>, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::weak_ptr<ARDOUR::Port>, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, bool>::invoke at /usr/include/boost/function/function_template.hpp:158
 #14 boost::function5<void, std::weak_ptr<ARDOUR::Port>, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::weak_ptr<ARDOUR::Port>, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, bool>::operator() at /usr/include/boost/function/function_template.hpp:763
 #15 boost::_bi::list5<boost::_bi::value<std::weak_ptr<ARDOUR::Port> >, boost::_bi::value<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >, boost::_bi::value<std::weak_ptr<ARDOUR::Port> >, boost::_bi::value<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >, boost::_bi::value<bool> >::operator()<boost::function<void (std::weak_ptr<ARDOUR::Port>, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::weak_ptr<ARDOUR::Port>, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, bool)>, boost::_bi::list0>(boost::_bi::type<void>, boost::function<void (std::weak_ptr<ARDOUR::Port>, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::weak_ptr<ARDOUR::Port>, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, bool)>&, boost::_bi::list0&, int) at /usr/include/boost/bind/bind.hpp:510
 #16 boost::_bi::bind_t<boost::_bi::unspecified, boost::function<void (std::weak_ptr<ARDOUR::Port>, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::weak_ptr<ARDOUR::Port>, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, bool)>, boost::_bi::list5<boost::_bi::value<std::weak_ptr<ARDOUR::Port> >, boost::_bi::value<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >, boost::_bi::value<std::weak_ptr<ARDOUR::Port> >, boost::_bi::value<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >, boost::_bi::value<bool> > >::operator()() at /usr/include/boost/bind/bind.hpp:1273
 #17 boost::detail::function::void_function_obj_invoker0<boost::_bi::bind_t<boost::_bi::unspecified, boost::function<void (std::weak_ptr<ARDOUR::Port>, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::weak_ptr<ARDOUR::Port>, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, bool)>, boost::_bi::list5<boost::_bi::value<std::weak_ptr<ARDOUR::Port> >, boost::_bi::value<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >, boost::_bi::value<std::weak_ptr<ARDOUR::Port> >, boost::_bi::value<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >, boost::_bi::value<bool> > >, void>::invoke(boost::detail::function::function_buffer&) at /usr/include/boost/function/function_template.hpp:158
 #18 AbstractUI<Gtkmm2ext::UIRequest>::handle_ui_requests at /usr/include/glibmm-2.4/glibmm/threads.h:849
 #19 BaseUI::request_handler at ../libs/pbd/base_ui.cc:153
 #20 sigc::slot1<bool, Glib::IOCondition>::operator() at /usr/include/sigc++-2.0/sigc++/functors/slot.h:665
 #21 cross_thread_channel_call_receive_slot at ../libs/pbd/crossthread.cc:52
 #24 g_main_context_iterate.isra.0 at ../glib/gmain.c:4276
 #26 gtk_main at /usr/src/debug/gtk2-2.24.33-13.fc38.x86_64/gtk/gtkmain.c:1270
 #27 Gtkmm2ext::UI::run at ../libs/gtkmm2ext/gtk_ui.cc:305