Performing an SST using xtrabackp (or xtrabackup-v2) methods
fails with following errors :

[Donor]
140411 15:25:35 [Note] WSREP: Shifting SYNCED -> DONOR/DESYNCED (TO: 2)
140411 15:25:35 [Note] WSREP: wsrep_notify_cmd is not defined, skipping notification.
140411 15:25:35 [Note] WSREP: Running: 'wsrep_sst_xtrabackup-v2 --role 'donor' --address '10.0.2.15:4444/xtrabackup_sst' --auth 'root:' --socket '/tmp/my_node1.sock' --datadir '_{/project/repo/maria/tmp/maria-10.0-galera/install/data1/' --defaults-file '}/project/repo/maria/tmp/maria-10.0-galera/install/my_1.cnf' '' --gtid 'fb0b6236-c1ae-11e3-bd94-832e280b71b0:2''
140411 15:25:35 [Note] WSREP: sst_donor_thread signaled with 0
WSREP_SST: [INFO] Streaming with xbstream (20140411 15:25:35.716)
WSREP_SST: [INFO] Using socat as streamer (20140411 15:25:35.718)
WSREP_SST: [INFO] Streaming GTID file before SST (20140411 15:25:35.878)
WSREP_SST: [INFO] Evaluating xbstream -c ${INFO_FILE} | socat -u stdio TCP:10.0.2.15:4444; RC=( ${PIPESTATUS[@]} ) (20140411 15:25:35.881)
WSREP_SST: [INFO] Sleeping before data transfer for SST (20140411 15:25:35.888)
WSREP_SST: [INFO] Streaming the backup to joiner at 10.0.2.15 4444 (20140411 15:25:45.895)
WSREP_SST: [INFO] Evaluating innobackupex --defaults-file=~/project/repo/maria/tmp/maria-10.0-galera/install/my_1.cnf --no-version-check $INNOEXTRA --galera-info --stream=$sfmt ${TMPDIR} 2>${DATA}/innobackup.backup.log | socat -u stdio TCP:10.0.2.15:4444; RC=( ${PIPESTATUS[@]} ) (20140411 15:25:45.904)
140411 15:25:48 [Note] WSREP: Provider paused at fb0b6236-c1ae-11e3-bd94-832e280b71b0:2
140411 15:25:51 [Note] WSREP: Provider resumed.
140411 15:25:51 [Note] WSREP: 1.0 (nirbhay-VirtualBox): State transfer to 0.0 (nirbhay-VirtualBox) complete.
140411 15:25:51 [Note] WSREP: Shifting DONOR/DESYNCED -> JOINED (TO: 2)
140411 15:25:51 [Note] WSREP: Member 1 (nirbhay-VirtualBox) synced with group.
140411 15:25:51 [Note] WSREP: Shifting JOINED -> SYNCED (TO: 2)
140411 15:25:51 [Note] WSREP: Synchronized with group, ready for connections
140411 15:25:51 [Note] WSREP: wsrep_notify_cmd is not defined, skipping notification.
WSREP_SST: [INFO] Total time on donor: 0 seconds (20140411 15:25:51.515)
140411 15:25:54 [Note] WSREP: Node fb0998fb-c1ae-11e3-a524-76aa02f3514a state prim

[Receiver]
140411 15:25:35 [Note] WSREP: Node 0.0 (nirbhay-VirtualBox) requested state transfer from 'any'. Selected 1.0 (nirbhay-VirtualBox)(SYNCED) as donor.
140411 15:25:35 [Note] WSREP: Shifting PRIMARY -> JOINER (TO: 2)
140411 15:25:35 [Note] WSREP: Requesting state transfer: success, donor: 1
WSREP_SST: [INFO] Proceeding with SST (20140411 15:25:36.032)
WSREP_SST: [INFO] Cleaning the existing datadir (20140411 15:25:36.036)
removed: ...
.. skip ..
WSREP_SST: [INFO] Evaluating socat -u TCP-LISTEN:4444,reuseaddr stdio | xbstream -x; RC=( ${PIPESTATUS[@]} ) (20140411 15:25:36.097)
140411 15:25:51 [Note] WSREP: 1.0 (nirbhay-VirtualBox): State transfer to 0.0 (nirbhay-VirtualBox) complete.
140411 15:25:51 [Note] WSREP: Member 1 (nirbhay-VirtualBox) synced with group.
WSREP_SST: [ERROR] xtrabackup process ended without creating '~/project/repo/maria/tmp/maria-10.0-galera/install/data2//xtrabackup_galera_info' (20140411 15:25:51.634)
WSREP_SST: [INFO] Contents of datadir (20140411 15:25:51.644)
.. skip ..
WSREP_SST: [ERROR] Cleanup after exit with status:32 (20140411 15:25:51.815)
WSREP_SST: [INFO] Removing the sst_in_progress file (20140411 15:25:51.819)
140411 15:25:51 [ERROR] WSREP: Process completed with error: wsrep_sst_xtrabackup-v2 --role 'joiner' --address '10.0.2.15' --auth 'root:' --datadir '_{/project/repo/maria/tmp/maria-10.0-galera/install/data2/' --defaults-file '}/project/repo/maria/tmp/maria-10.0-galera/install/my_2.cnf' --parent '6957' '' : 32 (Broken pipe)
140411 15:25:51 [ERROR] WSREP: Failed to read uuid:seqno from joiner script.
140411 15:25:51 [ERROR] WSREP: SST failed: 32 (Broken pipe)
140411 15:25:51 [ERROR] Aborting