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.
}
        pcursor->close();
    }
    catch (const boost::thread_interrupted&) {
        throw;
    }
    catch (...) {
        result = DBErrors::CORRUPT;
    }
    
    for (auto spk_man_pair : wss.m_active_external_spks) {
        pwallet->SetActiveScriptPubKeyMan(spk_man_pair.second, spk_man_pair.first,  false,  true);
    }
    for (auto spk_man_pair : wss.m_active_internal_spks) {
        pwallet->SetActiveScriptPubKeyMan(spk_man_pair.second, spk_man_pair.first,  true,  true);
    }
    
    for (auto desc_cache_pair : wss.m_descriptor_caches) {
        auto spk_man = pwallet->GetScriptPubKeyMan(desc_cache_pair.first);
        assert(spk_man);
        ((DescriptorScriptPubKeyMan*)spk_man)->SetCache(desc_cache_pair.second);
    }
    
    for (auto desc_key_pair : wss.m_descriptor_keys) {
        auto spk_man = pwallet->GetScriptPubKeyMan(desc_key_pair.first.first);
        ((DescriptorScriptPubKeyMan*)spk_man)->AddKey(desc_key_pair.first.second, desc_key_pair.second);
    }
    for (auto desc_key_pair : wss.m_descriptor_crypt_keys) {
        auto spk_man = pwallet->GetScriptPubKeyMan(desc_key_pair.first.first);
        ((DescriptorScriptPubKeyMan*)spk_man)->AddCryptedKey(desc_key_pair.first.second, desc_key_pair.second.first, desc_key_pair.second.second);