mcd crash during rebalance

Service 'memcached' exited with status 139. Restarting. Messages: 2016-05-09T10:24:10.855330-07:00 WARNING (default) Failed to fetch data from database, vBucket=188 key=7DF3DDC3-142_14215 error=document not found [none]

2016-05-09T10:24:10.855643-07:00 WARNING (default) Failed to fetch data from database, vBucket=252 key=7DF3DDC3-142_14221 error=document not found [none]

2016-05-09T10:24:10.856967-07:00 WARNING (default) Failed to fetch data from database, vBucket=665 key=C9465100-91_329 error=document not found [none]

2016-05-09T10:24:10.859953-07:00 WARNING Breakpad caught crash in memcached. Writing crash dump to /opt/couchbase/var/lib/couchbase/crash/375bcde6-3b9e-6b0b-4bcb2bbe-7d321a98.dmp before terminating.

2016-05-09T10:24:10.859987-07:00 WARNING Stack backtrace of crashed thread:

<0.1540.14> exited with {unexpected_exit,

                         {'EXIT',<0.1574.14>,

                          {{{{badmatch,{error,closed}},

                             [{mc_client_binary,cmd_vocal_recv,5,

                               [{file,"src/mc_client_binary.erl"},{line,156}]},

                              {mc_client_binary,select_bucket,2,

                               [{file,"src/mc_client_binary.erl"},{line,351}]},

                              {ns_memcached,ensure_bucket,2,

                               [{file,"src/ns_memcached.erl"},{line,1299}]},

                              {ns_memcached,handle_info,2,

                               [{file,"src/ns_memcached.erl"},{line,748}]},

                              {gen_server,handle_msg,5,

                               [{file,"gen_server.erl"},{line,604}]},

                              {ns_memcached,init,1,

                               [{file,"src/ns_memcached.erl"},{line,177}]},

                              {gen_server,init_it,6,

                               [{file,"gen_server.erl"},{line,304}]},

                              {proc_lib,init_p_do_apply,3,

                               [{file,"proc_lib.erl"},{line,239}]}]},

                            {gen_server,call,

                             ['ns_memcached-default',

                              {get_dcp_docs_estimate,744,

                               "replication:ns_1@172.23.105.62->ns_1@172.23.106.213:default"},

                              180000]}},

                           {gen_server,call,

                            [{'janitor_agent-default','ns_1@172.23.105.62'},

                             {if_rebalance,<0.15378.13>,

                              {wait_dcp_data_move,

                               ['ns_1@172.23.106.14','ns_1@172.23.106.213'],

                               744}},

                             infinity]}}}} hide