Reported here: https://github.com/bitcoin/bitcoin/pull/10244#issuecomment-378035305

Travis log here: https://travis-ci.org/bitcoin/bitcoin/jobs/361243719#L2810

Note the JSON exception:

```
test_framework.authproxy.JSONRPCException: The mempool was not loaded yet (-1) 
```

That exception was introduced here: https://github.com/bitcoin/bitcoin/commit/cb1e319fe9e198c9c5cf5236fe9af5a3d748b9e8#diff-a0c8f511d90e83aa9b5857e819ced344R1617

cc @jtimon 
};
extern CScript COINBASE_FLAGS;
extern CCriticalSection cs_main;
extern CBlockPolicyEstimator feeEstimator;
extern CTxMemPool mempool;
extern std::atomic_bool g_is_mempool_loaded;
typedef std::unordered_map<uint256, CBlockIndex*, BlockHasher> BlockMap;
extern BlockMap& mapBlockIndex GUARDED_BY(cs_main);
extern const std::string strMessageMagic;
extern Mutex g_best_block_mutex;
extern std::condition_variable g_best_block_cv;
extern uint256 g_best_block;
extern std::atomic_bool fImporting;
extern std::atomic_bool fReindex;
extern int nScriptCheckThreads;
extern bool fIsBareMultisigStd;
extern bool fRequireStandard;
extern bool fCheckBlockIndex;
extern bool fCheckpointsEnabled;
extern size_t nCoinCacheUsage;
extern CFeeRate minRelayTxFee;