Moxi segfault

I'm trying to reach 32000 requests per second and above. It is possible with memcached but impossible with moxi+couchbase. Segfaults are constantly appearing in moxi on high load for some reason. I have core dumps but moxi doesn't have any debug info. I used moxi binary from couchbase community edition 2.0.1

The moxi configuration I used:

port_listen = 11220,
default_bucket_name = default,
connect_timeout = 400,
connect_max_errors = 5,
wait_queue_timeout = 200,
downstream_timeout = 5000,
downstream_max = 1024,
downstream_conn_max = 4,
downstream_conn_queue_timeout = 200,
#connect_rerty_interval = 300,
cycle = 200

/opt/couchbase/bin/moxi -Z /opt/moxi/etc/moxi.cfg -z /opt/moxi/etc/moxi-cluster.cfg -c 12288 -t 12