Noticed that test-pmd is using a signal handler to exit. And that signal handle clears a flag "f_quit". But that variable is updated without atomic and is not volatile.
Simple fix to use atomic, would fix that part. But the signal_handler is calling a bunch of functions that are not safe in a signal handler. The signal handler in testpmd should only be doing atomic update of f_quit. All the cleanup logic needs to be moved to a place where thread is an safe state, like after exiting the forwarding loop in main thread. The problem is that testpmd has grown in complexity and not sure if this won't break other things.
