Using Ubuntu 18.04.2 LTS, with up-to-date, self-compiled master.
When I run
`./bitcoind -regtest -whitebind=bla`
I expect a clean shutdown with `Error: Cannot resolve -whitebind address: 'bla'`.
However sometimes my node doesn't stop and freezes (shutdown never finishes). 
This happens ~30% of the time for me, both on testnet and regtest. 

I believe that this is because `torControlThread.join();` never returns if it the thread is stopped right after its creation - it is started right before the whitebind part in `AppInitMain()`. If I insert a sleep before whitebind parameters are processed in Step 12 of `AppInitMain()` (or if I just disable the TorControl thread) the error does not occur.

Could someone try to reproduce? I encountered this testing #16248, but it is not restricted to this branch.

{
public:
    typedef std::function<void(TorControlConnection&)> ConnectionCB;
    typedef std::function<void(TorControlConnection &,const TorControlReply &)> ReplyHandlerCB;
    /** Create a new TorControlConnection.
     */
    explicit TorControlConnection(struct event_base *base);
    ~TorControlConnection();
    /**
     * Connect to a Tor control port.
     * target is address of the form host:port.
     * connected is the handler that is called when connection is successfully established.
     * disconnected is a handler that is called when the connection is broken.
     * Return true on success.
     */
    bool Connect(const std::string &target, const ConnectionCB& connected, const ConnectionCB& disconnected);
    /**
     * Disconnect from Tor control port.
     */
    void Disconnect();
    /** Send a command, register a handler for the reply.
     * A trailing CRLF is automatically added.
     * Return true on success.
     */