When running walletpassphrase on a large wallet.dat (ie about 300,000 segwit P2SH addresses) the command sometimes takes a very long time, and if command is run multiple times at once (while running slow) it causes bitcoin core to freeze (stops syncing and requires kill -9 to stop/restart)

During the locked up walletpassphrase commands being run the following messages start to appear in the debug.log:

`018-01-24 01:01:04 socket sending timeout: 1201s`

Note that this problem is intermittent, so sometimes the command runs instantly, other times it takes a few minutes, and other times it completely freezes the node.
{
    LOCK(cs_desc_man);
    if (!m_map_keys.empty()) {
        return false;
    }
    bool keyPass = m_map_crypted_keys.empty(); 
    bool keyFail = false;
    for (const auto& mi : m_map_crypted_keys) {
        const CPubKey &pubkey = mi.second.first;
        const std::vector<unsigned char> &crypted_secret = mi.second.second;
        CKey key;
        if (!DecryptKey(master_key, crypted_secret, pubkey, key)) {
            keyFail = true;
            break;
        }
        keyPass = true;
        if (m_decryption_thoroughly_checked)
            break;
    }
    if (keyPass && keyFail) {
        LogPrintf("The wallet is probably corrupted: Some keys decrypt but not all.\n");
        throw std::runtime_error("Error unlocking wallet: some keys decrypt but not all. Your wallet file may be corrupt.");
    }
    if (keyFail || (!keyPass && !accept_no_keys)) {
        return false;
    }
    m_decryption_thoroughly_checked = true;
    return true;
}
bool DescriptorScriptPubKeyMan::Encrypt(const CKeyingMaterial& master_key, WalletBatch* batch)