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 
{
    LOCK(cs_main);
    
    
    
    
    if (mapBlockIndex.count(chainparams.GenesisBlock().GetHash()))
        return true;
    try {
        const CBlock& block = chainparams.GenesisBlock();
        FlatFilePos blockPos = SaveBlockToDisk(block, 0, chainparams, nullptr);
        if (blockPos.IsNull())
            return error("%s: writing genesis block to disk failed", __func__);
        CBlockIndex *pindex = AddToBlockIndex(block);
        ReceivedBlockTransactions(block, pindex, blockPos, chainparams.GetConsensus());
    } catch (const std::runtime_error& e) {
        return error("%s: failed to write genesis block: %s", __func__, e.what());
    }
    return true;
}
bool LoadGenesisBlock(const CChainParams& chainparams)