95de61f74e
~Session calls AudioEngine::remove_session(), which fades out, then unsets the session, and then in libs/ardour/audioengine.cc:460 ``` session_removed.signal(); // wakes up thread that initiated session removal ``` Session d'tor continues, and calls Port::PortDrop(), which unregisters all ports one at a time. Concurrently, AudioEngine continues, and calls PortManager::silence_outputs which gets all ports first (!), and then iterates over them. There is a race condition which can lead to DummyAudioBackend::get_buffer: Assertion `valid_port (port)' failed
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