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);
    return m_wallet_descriptor.descriptor != nullptr && desc.descriptor != nullptr && m_wallet_descriptor.descriptor->ToString() == desc.descriptor->ToString();
}
void DescriptorScriptPubKeyMan::WriteDescriptor()
{
    LOCK(cs_desc_man);
    WalletBatch batch(m_storage.GetDatabase());
    if (!batch.WriteDescriptor(GetID(), m_wallet_descriptor)) {
        throw std::runtime_error(std::string(__func__) + ": writing descriptor failed");
    }
}
const WalletDescriptor DescriptorScriptPubKeyMan::GetWalletDescriptor() const
{
    return m_wallet_descriptor;
}
const std::vector<CScript> DescriptorScriptPubKeyMan::GetScriptPubKeys() const
{
    LOCK(cs_desc_man);
    std::vector<CScript> script_pub_keys;
    script_pub_keys.reserve(m_map_script_pub_keys.size());
    for (auto const& script_pub_key: m_map_script_pub_keys) {
        script_pub_keys.push_back(script_pub_key.first);
    }
    return script_pub_keys;
}