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);
    assert(m_storage.IsWalletFlagSet(WALLET_FLAG_DESCRIPTORS));
    
    if (m_wallet_descriptor.descriptor) {
        return false;
    }
    int64_t creation_time = GetTime();
    std::string xpub = EncodeExtPubKey(master_key.Neuter());
    
    std::string desc_prefix;
    std::string desc_suffix = "/*)";
    switch (m_address_type) {
    case OutputType::LEGACY: {
        desc_prefix = "pkh(" + xpub + "/44'";
        break;
    }
    case OutputType::P2SH_SEGWIT: {
        desc_prefix = "sh(wpkh(" + xpub + "/49'";
        desc_suffix += ")";
        break;
    }
    case OutputType::BECH32: {
        desc_prefix = "wpkh(" + xpub + "/84'";
        break;
    }