rebalance-in failed with beam.smp resident set size ~20GB

I've never seen such a mess in logs, but apart from all issues memory consumption looks really weird:

1. ps -eo rss,vsize,args | grep beam
   19867592 27554248 /opt/couchbase/lib/erlang/erts-5.8.5/bin/beam.smp -S 16:16 -sbt u -P 327680 -K true – -root /opt/couchbase/lib/erlang -progname erl – -home /opt/couchbase – -smp enable -setcookie nocookie -kernel inet_dist_listen_min 21100 inet_dist_listen_max 21299 error_logger false -sasl sasl_error_logger false -noshell -noinput -noshell -noinput -run ns_bootstrap – -name ns_1@10.2.1.66 -couch_ini /opt/couchbase/etc/couchdb/default.ini /opt/couchbase/etc/couchdb/default.d/capi.ini /opt/couchbase/etc/couchdb/default.d/geocouch.ini /opt/couchbase/etc/couchdb/local.ini -ns_server config_path "/opt/couchbase/etc/couchbase/static_config" -ns_server pidfile "/opt/couchbase/var/lib/couchbase/couchbase-server.pid" -ns_server nodefile "/opt/couchbase/var/lib/couchbase/couchbase-server.node" -ns_server cookiefile "/opt/couchbase/var/lib/couchbase/couchbase-server.cookie"