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 
{
private:
    const CTransactionRef tx;
    const CAmount nFee;             
    const size_t nTxWeight;         
    const size_t nUsageSize;        
    const int64_t nTime;            
    const unsigned int entryHeight; 
    const bool spendsCoinbase;      
    const int64_t sigOpCost;        
    int64_t feeDelta;          
    LockPoints lockPoints;     
    
    
    
    uint64_t nCountWithDescendants;  
    uint64_t nSizeWithDescendants;   
    CAmount nModFeesWithDescendants; 
    
    uint64_t nCountWithAncestors;
    uint64_t nSizeWithAncestors;
    CAmount nModFeesWithAncestors;
    int64_t nSigOpCostWithAncestors;
public:
    CTxMemPoolEntry(const CTransactionRef& _tx, const CAmount& _nFee,
                    int64_t _nTime, unsigned int _entryHeight,
                    bool spendsCoinbase,
                    int64_t nSigOpsCost, LockPoints lp);
    const CTransaction& GetTx() const { return *this->tx; }