Comment 11 for bug 1451524

I am seeing this as well on Ubuntu Trusty, socat remains running after any IST/SST:

2015-05-18 11:18:57 21604 [Note] WSREP: Prepared SST request: xtrabackup-v2|10.10.50.212:4444/xtrabackup_sst//1
2015-05-18 11:18:57 21604 [Note] WSREP: wsrep_notify_cmd is not defined, skipping notification.
2015-05-18 11:18:57 21604 [Note] WSREP: REPL Protocols: 6 (3, 2)
2015-05-18 11:18:57 21604 [Note] WSREP: Service thread queue flushed.
2015-05-18 11:18:57 21604 [Note] WSREP: Assign initial position for certification: 424819546, protocol version: 3
2015-05-18 11:18:57 21604 [Note] WSREP: Service thread queue flushed.
2015-05-18 11:18:57 21604 [Note] WSREP: Prepared IST receiver, listening at: tcp://10.10.50.212:4568
2015-05-18 11:18:57 21604 [Note] WSREP: Member 1.0 (atl-userdb4) requested state transfer from '*any*'. Selected 2.0 (atl-userdb1)(SYNCED) as donor.
2015-05-18 11:18:57 21604 [Note] WSREP: Shifting PRIMARY -> JOINER (TO: 424819546)
2015-05-18 11:18:57 21604 [Note] WSREP: Requesting state transfer: success, donor: 2
WSREP_SST: [INFO] Evaluating timeout -k 110 100 socat -u TCP-LISTEN:4444,reuseaddr stdio | xbstream -x; RC=( ${PIPESTATUS[@]} ) (20150518 11:18:57.335)
2015/05/18 11:18:57 socat[21854] E bind(3, {AF=2 0.0.0.0:4444}, 16): Address already in use
WSREP_SST: [ERROR] Error while getting data from donor node: exit codes: 1 0 (20150518 11:18:57.341)
WSREP_SST: [ERROR] Cleanup after exit with status:32 (20150518 11:18:57.344)
2015-05-18 11:18:57 21604 [ERROR] WSREP: Process completed with error: wsrep_sst_xtrabackup-v2 --role 'joiner' --address '10.10.50.212' --auth 'root:XXXXXX' --datadir '/var/lib/mysql/' --defaults-file '/etc/mysql/my.cnf' --parent '21604' '' : 32 (Broken pipe)
2015-05-18 11:18:57 21604 [ERROR] WSREP: Failed to read uuid:seqno from joiner script.
2015-05-18 11:18:57 21604 [ERROR] WSREP: SST failed: 32 (Broken pipe)
2015-05-18 11:18:57 21604 [ERROR] Aborting

^Gxbstream: Can't create/write to file './xtrabackup_galera_info' (Errcode: 2 - No such file or directory)
xbstream: failed to create file.