CouchbaseClient doesn't timeout, hangs forever

On a single node cluster:

1. open CouchbaseClient with opTimeout = 10sec (on a different machine)
2. write 50 docs (works fine)
3. make the server drop packets for 15sec (iptables -A INPUT -p tcp --dport 200:65535 -j DROP)
4. try to write another doc -> blocks forever

I've tried different timeout values: opTimeout =2.5sec, dropping packets for 5sec, but it also never times-out.

The code to reproduce this issue is here: https://github.com/mbsimonovic/jepsen-couchbase.
A more detailed explanation in my blog post: http://milansimonovic.com/2014/07/22/smashing-couchbase/