I've got 9.0 running self built on Fedora 43; it's working OK, I have had a couple of crashes (which I can't figure out how to report); a seg: #1 0x00007f5085ea1663 in jack_port_type_to_ardour_data_type (jack_type=0x0) at ../libs/backends/jack/jack_portengine.cc:71 #2 0x00007f5085ea346a in ARDOUR::JACKAudioBackend::port_data_type (this=0x1ac84ad0, port=...) at ../libs/backends/jack/jack_portengine.cc:465 #3 0x0000000000e3c719 in PortGroupList::gather

which I think is a lack of cast check in port_data_type? (from IOSelector::setup_ports -> PortMatrix::setup_global_ports )

I also got an assert in; #5 0x00000000011fa927 in StartupFSM::check_session_parameters (this=0x3dcf00a0, must_be_new=true) at ../gtk2_ardour/startup_fsm.cc:740 #6 0x00000000011f80d2 in StartupFSM::dialog_response_handler (this=0x3dcf00a0, response=-3, dialog_id=StartupFSM::NewSessionDialog) at ../gtk2_ardour/startup_fsm.cc:267

I think this was opening an existing ardour project that I'd copied onto this machine and was the first run of ardour on this machine.