Hi,
Using Bitcoin Core RPC client version v0.17.0.1-g1476554d3b1db5352c0de1de7524864d4bce3aac

I'm using bitcoin-cli loadwallet and unloadwallet commands. They both seem to work fine.
Unfortunately, memory is getting higher and higher, and no wallet can be loaded after 300 have been.
The problem may be related to BerkeleyDB rather than to Bitcoin Core itself. Fact is that lsof shows handles not cleared off after the unloadwallet command is issued. Files still handled are .walletlock, db.log and database/log.0000000001 .
When 300 different wallets have been loaded/unloaded, used RAM is over 8 GB, and bitcoind will finally become unstable and fail.

Any help would be appreciated.
Regards,
{
        auto it = map_args.find(arg);
        if (it != map_args.end()) {
            res.insert(res.end(), it->second.begin(), it->second.end());
        }
    }
    /** Return true/false if an argument is set in a map, and also
     *  return the first (or last) of the possibly multiple values it has
     */
    static inline std::pair<bool,std::string> GetArgHelper(const MapArgs& map_args, const std::string& arg, bool getLast = false)
    {
        auto it = map_args.find(arg);
        if (it == map_args.end() || it->second.empty()) {
            return std::make_pair(false, std::string());
        }
        if (getLast) {
            return std::make_pair(true, it->second.back());
        } else {
            return std::make_pair(true, it->second.front());
        }
    }
    /* Get the string value of an argument, returning a pair of a boolean
     * indicating the argument was found, and the value for the argument
     * if it was found (or the empty string if not found).
     */
    static inline std::pair<bool,std::string> GetArg(const ArgsManager &am, const std::string& arg)