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.

{
    std::map<std::string,std::string> mapping;
    size_t ptr=0;
    while (ptr < s.size()) {
        std::string key, value;
        while (ptr < s.size() && s[ptr] != '=' && s[ptr] != ' ') {
            key.push_back(s[ptr]);
            ++ptr;
        }
        if (ptr == s.size()) 
            return std::map<std::string,std::string>();
        if (s[ptr] == ' ') 
            break;
        ++ptr; 
        if (ptr < s.size() && s[ptr] == '"') { 
            ++ptr; 
            bool escape_next = false;
            while (ptr < s.size() && (escape_next || s[ptr] != '"')) {
                
                escape_next = (s[ptr] == '\\' && !escape_next);
                value.push_back(s[ptr]);
                ++ptr;
            }
            if (ptr == s.size()) 
                return std::map<std::string,std::string>();
            ++ptr; 
            /**
             * Unescape value. Per https://spec.torproject.org/control-spec section 2.1.1: