As of #11466 we no longer have any logic to prevent a user from opening a wallet twice in two instances simultaneously. Not only could this break BDB (without the -privdb=false option, which I have really no idea why we even have a tuneable option for that), but we certainly don't have logic to handle such a case gracefully. It was noted in the original PR's description, but somehow was never followed up on before merge.
return InitError(AmountErrMsg("minrelaytxfee", gArgs.GetArg("-minrelaytxfee", "")));
        }
        
        ::minRelayTxFee = CFeeRate(n);
    } else if (incrementalRelayFee > ::minRelayTxFee) {
        
        ::minRelayTxFee = incrementalRelayFee;
        LogPrintf("Increasing minrelaytxfee to %s to match incrementalrelayfee\n",::minRelayTxFee.ToString());
    }
    
    
    if (gArgs.IsArgSet("-blockmintxfee"))
    {
        CAmount n = 0;
        if (!ParseMoney(gArgs.GetArg("-blockmintxfee", ""), n))
            return InitError(AmountErrMsg("blockmintxfee", gArgs.GetArg("-blockmintxfee", "")));
    }
    
    
    if (gArgs.IsArgSet("-dustrelayfee"))
    {
        CAmount n = 0;
        if (!ParseMoney(gArgs.GetArg("-dustrelayfee", ""), n) || 0 == n)
            return InitError(AmountErrMsg("dustrelayfee", gArgs.GetArg("-dustrelayfee", "")));
        dustRelayFee = CFeeRate(n);
    }
    fRequireStandard = !gArgs.GetBoolArg("-acceptnonstdtxn", !chainparams.RequireStandard());
    if (chainparams.RequireStandard() && !fRequireStandard)
        return InitError(strprintf("acceptnonstdtxn is not currently supported for %s chain", chainparams.NetworkIDString()));
    nBytesPerSigOp = gArgs.GetArg("-bytespersigop", nBytesPerSigOp);