Not closing vbm connections correctly (Symptom is failed rebalance)

Created an attachment (id=507)
logs

Created 3 buckets on single node.
Default - loaded with ~1G of data
Ascii-11213 - loaded with 1G of data
Bin - no data.

Add a second node and rebalance.
Rebalance failed.

Rebalance exited with reason {badmatch,{error,closed, [

{mc_client_binary,cmd_binary_vocal_recv,4}

,

{mc_client_binary,get_vbucket,2}

,

{ns_memcached,handle_call,3}

,

{gen_server,handle_msg,5}

,

{proc_lib,init_p_do_apply,3}

]}, {gen_server,call, [

{'ns_memcached-ascii-11213', 'ns_1@10.2.1.13'}

,

{get_vbucket,16}

]}}
ns_orchestrator002

Deleting the none default buckets.
Rebalance still fails.

Logs from both machines attached.