https://bugs.launchpad.net/percona-xtradb-cluster/+bug/1321767

I'm experiencing the same issue:

140827 7:11:29 [Note] WSREP: Member 0.0 (ip-172-31-8-102) requested state transfer from 'any'. Selected 1.0 (ip-172-31-8-213)(SYNCED) as donor.
140827 7:11:29 [Note] WSREP: Shifting SYNCED -> DONOR/DESYNCED (TO: 4497)
140827 7:11:29 [Note] WSREP: IST request: aa917245-2d1e-11e4-ab4a-fba5d2333991:4491-4497|tcp://172.31.8.102:4568
140827 7:11:29 [Note] WSREP: wsrep_notify_cmd is not defined, skipping notification.
140827 7:11:29 [Note] WSREP: Running: 'wsrep_sst_rsync --role 'donor' --address '172.31.8.102:4444/rsync_sst' --auth '(null)' --socket '/var/lib/mysql/mysql.sock' --datadir '/var/lib/mysql/' --defaults-file '/etc/my.cnf' '' --gtid 'aa917245-2d1e-11e4-ab4a-fba5d2333991:4491' --bypass'
140827 7:11:29 [Note] WSREP: sst_donor_thread signaled with 0
140827 7:11:29 [Note] WSREP: async IST sender starting to serve tcp://172.31.8.102:4568 sending 4492-4497
WSREP_SST: [INFO] Bypassing state dump. (20140827 07:11:29.686)
140827 7:11:31 [Note] WSREP: async IST sender served
140827 7:11:31 [Note] WSREP: 1.0 (ip-172-31-8-213): State transfer to 0.0 (ip-172-31-8-102) complete.
140827 7:11:31 [Note] WSREP: Shifting DONOR/DESYNCED -> JOINED (TO: 4497)
140827 7:11:31 [Note] WSREP: 0.0 (ip-172-31-8-102): State transfer from 1.0 (ip-172-31-8-213) complete.
140827 7:11:31 [Note] WSREP: Member 1.0 (ip-172-31-8-213) synced with group.
140827 7:11:31 [Note] WSREP: Shifting JOINED -> SYNCED (TO: 4497)
140827 7:11:31 [Note] WSREP: Synchronized with group, ready for connections
140827 7:11:31 [Note] WSREP: wsrep_notify_cmd is not defined, skipping notification.
140827 7:11:31 [Note] WSREP: Member 0.0 (ip-172-31-8-102) synced with group.
BF-BF X lock conflict
RECORD LOCKS space id 180 page no 3 n bits 72 index `GEN_CLUST_INDEX` of table `jackrabbit`.`LOCAL_REVISIONS` trx id 32999 lock_mode X locks rec but not gap
140827 8:12:33 [ERROR] mysqld got signal 6 ;
This could be because you hit a bug. It is also possible that this binary
or one of the libraries it was linked against is corrupt, improperly built,
or misconfigured. This error can also be caused by malfunctioning hardware.

To report this bug, see http://kb.askmonty.org/en/reporting-bugs

We will try our best to scrape up some info that will hopefully help
diagnose the problem, but since we have already crashed,
something is definitely wrong and this may fail.

Server version: 10.0.11-MariaDB-wsrep
key_buffer_size=134217728
read_buffer_size=131072
max_used_connections=14
max_threads=153
thread_count=16
It is possible that mysqld could use up to
key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 467215 K bytes of memory
Hope that's ok; if not, decrease some variables in the equation.

Thread pointer: 0x0x7fbc4db3d008
Attempting backtrace. You can use the following information to find out
where mysqld died. If you see no messages after this, something went
terribly wrong...
stack_bottom = 0x7fbc7389ccb0 thread_stack 0x48000
/usr/sbin/mysqld(my_print_stacktrace+0x2b)[0xb8d2ab]
/usr/sbin/mysqld(handle_fatal_signal+0x398)[0x740b88]
/lib64/libpthread.so.0(+0xf710)[0x7fbc7360b710]
/lib64/libc.so.6(gsignal+0x35)[0x7fbc71c6c925]
/lib64/libc.so.6(abort+0x175)[0x7fbc71c6e105]
/usr/sbin/mysqld[0x5302a6]
/usr/sbin/mysqld[0x8c0f11]
/usr/sbin/mysqld[0x8c41b1]
/usr/sbin/mysqld[0x8c81f1]
/usr/sbin/mysqld[0x93ff6f]
/usr/sbin/mysqld[0x945312]
/usr/sbin/mysqld[0x89b3a5]
/usr/sbin/mysqld[0x884927]
/usr/sbin/mysqld[0x89b01f]
/usr/sbin/mysqld(_ZN7handler11ha_rnd_nextEPh+0x164)[0x745314]
/usr/sbin/mysqld(_ZN14Rows_log_event8find_rowEP14rpl_group_info+0x4ce)[0x80541e]
/usr/sbin/mysqld(_ZN21Update_rows_log_event11do_exec_rowEP14rpl_group_info+0x67)[0x805507]
/usr/sbin/mysqld(_ZN14Rows_log_event14do_apply_eventEP14rpl_group_info+0x251)[0x7f91e1]
/usr/sbin/mysqld(_Z14wsrep_apply_cbPvPKvmjPK14wsrep_trx_meta+0x4d5)[0x6ee5b5]
/usr/lib64/galera/libgalera_smm.so(ZNK6galera9TrxHandle5applyEPvPF15wsrep_cb_statusS1_PKvmjPK14wsrep_trx_metaERS6+0xb1)[0x7fbc6c3462c1]
/usr/lib64/galera/libgalera_smm.so(+0x1aaf95)[0x7fbc6c37df95]
/usr/lib64/galera/libgalera_smm.so(_ZN6galera13ReplicatorSMM10replay_trxEPNS_9TrxHandleEPv+0x12e)[0x7fbc6c37e85e]
/usr/lib64/galera/libgalera_smm.so(galera_replay_trx+0x5c)[0x7fbc6c39245c]
/usr/sbin/mysqld(_Z24wsrep_replay_transactionP3THD+0x2de)[0x6f015e]
/usr/sbin/mysqld[0x5df310]
/usr/sbin/mysqld(_Z16dispatch_command19enum_server_commandP3THDPcj+0x16d0)[0x5e0a90]
/usr/sbin/mysqld(_Z10do_commandP3THD+0x132)[0x5e1262]
/usr/sbin/mysqld(_Z24do_handle_one_connectionP3THD+0x54b)[0x69fb6b]
/usr/sbin/mysqld(handle_one_connection+0x42)[0x69fc62]
/usr/sbin/mysqld[0xa831cd]
/lib64/libpthread.so.0(+0x79d1)[0x7fbc736039d1]
/lib64/libc.so.6(clone+0x6d)[0x7fbc71d22b6d]

Trying to get some variables.
Some pointers may be invalid and cause the dump to abort.
Query (0x7fbc5f990020): is an invalid pointer
Connection ID (thread ID): 18
Status: NOT_KILLED

Optimizer switch: index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=off,engine_condition_pushdown=off,index_condition_pushdown=on,derived_merge=on,derived_with_keys=on,firstmatch=on,loosescan=on,materialization=on,in_to_exists=on,semijoin=on,partial_match_rowid_merge=on,partial_match_table_scan=on,subquery_cache=on,mrr=off,mrr_cost_based=off,mrr_sort_keys=off,outer_join_with_cache=on,semijoin_with_cache=on,join_cache_incremental=on,join_cache_hashed=on,join_cache_bka=on,optimize_join_buffer_size=off,table_elimination=on,extended_keys=on,exists_to_in=off

we got the same issue

141021 11:06:28 [Note] WSREP: wsrep_notify_cmd is not defined, skipping notification.
141021 11:06:28 [Note] WSREP: REPL Protocols: 5 (3, 1)
141021 11:06:28 [Note] WSREP: Service thread queue flushed.
141021 11:06:28 [Note] WSREP: Assign initial position for certification: 22496157, protocol version: 3
141021 11:06:28 [Note] WSREP: Service thread queue flushed.
141021 11:06:28 [Warning] WSREP: Releasing seqno 22496157 before 22496158 was assigned.
141021 11:06:30 [Note] WSREP: Member 1.0 (gtbcs-dbdev-vm-8e719eac) requested state transfer from 'any'. Selected 0.0 (lupin-gen-r72012014-4bs1202)(SYNCED) as donor.
141021 11:06:30 [Note] WSREP: Shifting SYNCED -> DONOR/DESYNCED (TO: 22496166)
141021 11:06:30 [Note] WSREP: IST request: ae79d681-40e2-11e4-ad0f-8afe6a8541b3:13990739-22496157|tcp://10.1.1.90:4568
141021 11:06:30 [Note] WSREP: IST first seqno 13990740 not found from cache, falling back to SST
141021 11:06:30 [Note] WSREP: wsrep_notify_cmd is not defined, skipping notification.
141021 11:06:30 [Note] WSREP: Running: 'wsrep_sst_rsync --role 'donor' --address '10.1.1.90:4444/rsync_sst' --auth 'root:vlPaVrbpx1ZNwf6KcUAI' --socket '/var/lib/mysql/mysql.sock' --datadir '/var/lib/mysql/' --defaults-file '/etc/my.cnf' --gtid 'ae79d681-40e2-11e4-ad0f-8afe6a8541b3:22496166''
141021 11:06:30 [Note] WSREP: sst_donor_thread signaled with 0
141021 11:06:30 [Note] WSREP: Flushing tables for SST...
141021 11:06:30 [Note] WSREP: Provider paused at ae79d681-40e2-11e4-ad0f-8afe6a8541b3:22496167 (12143365)
141021 11:06:30 [Note] WSREP: Tables flushed.
141021 11:09:04 [Note] WSREP: resuming provider at 12143365
141021 11:09:04 [Note] WSREP: Provider resumed.
141021 11:09:04 [Note] WSREP: 0.0 (lupin-gen-r72012014-4bs1202): State transfer to 1.0 (gtbcs-dbdev-vm-8e719eac) complete.
141021 11:09:04 [Note] WSREP: Shifting DONOR/DESYNCED -> JOINED (TO: 22497379)
141021 11:09:05 [Note] WSREP: Member 0.0 (lupin-gen-r72012014-4bs1202) synced with group.
141021 11:09:05 [Note] WSREP: Shifting JOINED -> SYNCED (TO: 22497393)
141021 11:09:05 [Note] WSREP: Synchronized with group, ready for connections
141021 11:09:05 [Note] WSREP: wsrep_notify_cmd is not defined, skipping notification.
141021 11:09:11 [Note] WSREP: 1.0 (gtbcs-dbdev-vm-8e719eac): State transfer from 0.0 (lupin-gen-r72012014-4bs1202) complete.
141021 11:09:18 [Note] WSREP: Member 1.0 (gtbcs-dbdev-vm-8e719eac) synced with group.
BF-BF X lock conflict
RECORD LOCKS space id 1719 page no 3 n bits 144 index `GEN_CLUST_INDEX` of table `otrs`.`process_id` trx id 2DBE14A lock_mode X locks rec but not gap
141027 4:10:02 [ERROR] mysqld got signal 6 ;
This could be because you hit a bug. It is also possible that this binary
or one of the libraries it was linked against is corrupt, improperly built,
or misconfigured. This error can also be caused by malfunctioning hardware.

To report this bug, see http://kb.askmonty.org/en/reporting-bugs

We will try our best to scrape up some info that will hopefully help
diagnose the problem, but since we have already crashed,
something is definitely wrong and this may fail.

Server version: 5.5.39-MariaDB-wsrep
key_buffer_size=25165824
read_buffer_size=131072
max_used_connections=3
max_threads=502
thread_count=50
It is possible that mysqld could use up to
key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 1126086 K bytes of memory
Hope that's ok; if not, decrease some variables in the equation.

Thread pointer: 0x0x7f626d812000
Attempting backtrace. You can use the following information to find out
where mysqld died. If you see no messages after this, something went
terribly wrong...
stack_bottom = 0x7f625cdb4940 thread_stack 0x48000
/usr/sbin/mysqld(my_print_stacktrace+0x2b)[0xa95ecb]
/usr/sbin/mysqld(handle_fatal_signal+0x398)[0x6ebbc8]
/lib64/libpthread.so.0[0x333ba0f710]
/lib64/libc.so.6(gsignal+0x35)[0x333b632635]
/lib64/libc.so.6(abort+0x175)[0x333b633e15]
/usr/sbin/mysqld[0x50eb40]
/usr/sbin/mysqld[0x92c23f]
/usr/sbin/mysqld[0x9318d9]
/usr/sbin/mysqld[0x931c4a]
/usr/sbin/mysqld[0x858192]
/usr/sbin/mysqld[0x85c271]
/usr/sbin/mysqld[0x830453]
/usr/sbin/mysqld[0x824467]
/usr/sbin/mysqld[0x83298f]
/usr/sbin/mysqld(_ZN7handler11ha_rnd_nextEPh+0x15)[0x55f445]
/usr/sbin/mysqld(_ZN14Rows_log_event8find_rowEPK14Relay_log_info+0x5d6)[0x7a3a26]
/usr/sbin/mysqld(_ZN21Delete_rows_log_event11do_exec_rowEPK14Relay_log_info+0x65)[0x7a3e35]
/usr/sbin/mysqld(_ZN14Rows_log_event14do_apply_eventEPK14Relay_log_info+0x26a)[0x798b3a]
/usr/sbin/mysqld(_Z14wsrep_apply_cbPvPKvmjPK14wsrep_trx_meta+0x5e8)[0x69f848]
/usr/lib64/galera/libgalera_smm.so(ZNK6galera9TrxHandle5applyEPvPF15wsrep_cb_statusS1_PKvmjPK14wsrep_trx_metaERS6+0xb1)[0x7f641b5542c1]
/usr/lib64/galera/libgalera_smm.so(+0x1aaf95)[0x7f641b58bf95]
/usr/lib64/galera/libgalera_smm.so(_ZN6galera13ReplicatorSMM9apply_trxEPvPNS_9TrxHandleE+0x283)[0x7f641b58ce03]
/usr/lib64/galera/libgalera_smm.so(_ZN6galera13ReplicatorSMM11process_trxEPvPNS_9TrxHandleE+0x45)[0x7f641b58d6f5]
/usr/lib64/galera/libgalera_smm.so(_ZN6galera15GcsActionSource8dispatchEPvRK10gcs_actionRb+0x2c9)[0x7f641b56a349]
/usr/lib64/galera/libgalera_smm.so(_ZN6galera15GcsActionSource7processEPvRb+0x63)[0x7f641b56a823]
/usr/lib64/galera/libgalera_smm.so(_ZN6galera13ReplicatorSMM10async_recvEPv+0x93)[0x7f641b5893f3]
/usr/lib64/galera/libgalera_smm.so(galera_recv+0x23)[0x7f641b59e743]
/usr/sbin/mysqld[0x6a023f]
/usr/sbin/mysqld(start_wsrep_THD+0x365)[0x5278c5]
/lib64/libpthread.so.0[0x333ba079d1]
/lib64/libc.so.6(clone+0x6d)[0x333b6e886d]

Trying to get some variables.
Some pointers may be invalid and cause the dump to abort.
Query (0x0): is an invalid pointer
Connection ID (thread ID): 3
Status: NOT_KILLED

Optimizer switch: index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=off,engine_condition_pushdown=on,index_condition_pushdown=on,derived_merge=on,derived_with_keys=on,firstmatch=on,loosescan=on,materialization=on,in_to_exists=on,semijoin=on,partial_match_rowid_merge=on,partial_match_table_scan=on,subquery_cache=on,mrr=off,mrr_cost_based=off,mrr_sort_keys=off,outer_join_with_cache=on,semijoin_with_cache=on,join_cache_incremental=on,join_cache_hashed=on,join_cache_bka=on,optimize_join_buffer_size=off,table_elimination=on,extended_keys=off

The manual page at http://dev.mysql.com/doc/mysql/en/crashing.html contains
information that should help you find out what is causing the crash.
141027 04:10:03 mysqld_safe Number of processes running now: 0
141027 04:10:03 mysqld_safe WSREP: not restarting wsrep node automatically
141027 04:10:03 mysqld_safe mysqld from pid file /var/lib/mysql/mysqld.pid ended
[root@lupin-gen-r72012014-4bs1202 mysql]#
[root@lupin-gen-r72012014-4bs1202 mysql]# ps -ef | egrep mysql
root 16296 16093 0 09:08 pts/0 00:00:00 egrep mysql
[root@lupin-gen-r72012014-4bs1202 mysql]#
[root@lupin-gen-r72012014-4bs1202 mysql]# rpm -qa | egrep -i "galera|maria"
MariaDB-client-5.5.39-1.el6.x86_64
galera-25.3.5-1.rhel6.x86_64
MariaDB-common-5.5.39-1.el6.x86_64
MariaDB-compat-5.5.39-1.el6.x86_64
MariaDB-Galera-server-5.5.39-1.el6.x86_64

https://bugs.launchpad.net/codership-mysql/+bug/1280896