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.
{
    return m_batch.Read(std::make_pair(DBKeys::POOL, nPool), keypool);
}
bool WalletBatch::WritePool(int64_t nPool, const CKeyPool& keypool)
{
    return WriteIC(std::make_pair(DBKeys::POOL, nPool), keypool);
}
bool WalletBatch::ErasePool(int64_t nPool)
{
    return EraseIC(std::make_pair(DBKeys::POOL, nPool));
}
bool WalletBatch::WriteMinVersion(int nVersion)
{
    return WriteIC(DBKeys::MINVERSION, nVersion);
}
bool WalletBatch::WriteActiveScriptPubKeyMan(uint8_t type, const uint256& id, bool internal)
{
    std::string key = internal ? DBKeys::ACTIVEINTERNALSPK : DBKeys::ACTIVEEXTERNALSPK;
    return WriteIC(make_pair(key, type), id);
}
bool WalletBatch::WriteDescriptorKey(const uint256& desc_id, const CPubKey& pubkey, const CPrivKey& privkey)
{
    
    std::vector<unsigned char> key;
    key.reserve(pubkey.size() + privkey.size());
    key.insert(key.end(), pubkey.begin(), pubkey.end());
    key.insert(key.end(), privkey.begin(), privkey.end());
    return WriteIC(std::make_pair(DBKeys::WALLETDESCRIPTORKEY, std::make_pair(desc_id, pubkey)), std::make_pair(privkey, Hash(key.begin(), key.end())), false);
}
bool WalletBatch::WriteCryptedDescriptorKey(const uint256& desc_id, const CPubKey& pubkey, const std::vector<unsigned char>& secret)