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The backend holds `_port_callback_mutex` while disconnecting ports. In some cases disconnecting a port can drop the last reference resulting in a port-deletion from the connection handler. This in turn will eventually aquire the `_port_callback_mutex` and deadlock. This is now circumvented by using atomic operations instead of taking a lock to set the `_port_change_flag`. The flag is also used to trigger a latency update in some cases, atomic is preferable to taking a lock to set this flag. -- Full bt: https://paste.debian.net/1184056/ Short: #1 in pthread_mutex_lock () #2 in ARDOUR::PortEngineSharedImpl::port_connect_add_remove_callback() #3 in ARDOUR::BackendPort::~BackendPort() #4 in ARDOUR::DummyPort::~DummyPort() #6 in ARDOUR::DummyAudioPort::~DummyAudioPort() #7 in boost::checked_delete<ARDOUR::BackendPort>(ARDOUR::BackendPort*) #12 in boost::shared_ptr<ARDOUR::ProtoPort>::reset() #13 in ARDOUR::Port::drop() #14 in ARDOUR::Port::~Port() #15 in ARDOUR::AudioPort::~AudioPort() #17 in ARDOUR::AudioEngine::add_pending_port_deletion(ARDOUR::Port*) #20 in boost::detail::sp_counted_base::release() #37 in ARDOUR::PortManager::connect_callback() at libs/ardour/port_manager.cc:788 #38 in ARDOUR::DummyAudioBackend::main_process_thread() at libs/backends/dummy/dummy_audiobackend.cc:1018 |
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| appleutility | ||
| ardour | ||
| ardouralsautil | ||
| audiographer | ||
| backends | ||
| canvas | ||
| clearlooks-newer | ||
| evoral | ||
| fluidsynth | ||
| fst | ||
| gtkmm2ext | ||
| hidapi | ||
| libltc | ||
| lua | ||
| midi++2 | ||
| panners | ||
| pbd | ||
| plugins | ||
| ptformat | ||
| qm-dsp | ||
| surfaces | ||
| temporal | ||
| vamp-plugins | ||
| vamp-pyin | ||
| vfork | ||
| vst3 | ||
| waveview | ||
| widgets | ||
| zita-convolver | ||
| zita-resampler | ||