This post is more than 2 years old.
Yesterday I ran into an odd issue with an Ionic demo. I was trying to run it on an iOS device and it kept hanging. After about 5 seconds of hanging, I'd see
(lldb) and then nothing else would happen. I switched to using the Cordova CLI and confirmed the same thing happened there. After a bit of Googling, I found myself on the Ionic forums at this thread: Error when doing 'ionic run ios'. Long story short, there is a process, lldb, that is hanging around and blocking access to the device. Use the suggested
pkill lldb command and you should be good to go.