This is due to wsrep_log_conflicts logic in PXC tree (not in codership tree).


However, using codership conflict logic here leads to

2014-03-17 22:15:01 13605 [Note] WSREP: Provider paused at f7e31510-9958-11e3-82f8-abba51ecd1d8:561479 (5)
2014-03-17 22:15:03 13605 [Note] WSREP: resuming provider at 5
2014-03-17 22:15:03 13605 [Note] WSREP: Provider resumed.
2014-03-17 22:15:03 13605 [Note] WSREP: 0.0 (Arch1): State transfer to 1.0 (Arch2) complete.
2014-03-17 22:15:03 13605 [Note] WSREP: Shifting DONOR/DESYNCED -> JOINED (TO: 561479)
2014-03-17 22:15:03 13605 [Note] WSREP: Member 0 (Arch1) synced with group.
2014-03-17 22:15:03 13605 [Note] WSREP: Shifting JOINED -> SYNCED (TO: 561479)
2014-03-17 22:15:03 13605 [Note] WSREP: Synchronized with group, ready for connections
2014-03-17 22:15:03 13605 [Note] WSREP: wsrep_notify_cmd is not defined, skipping notification.
WSREP_SST: [INFO] Total time on donor: 0 seconds (20140317 22:15:03.272)
[Thread 0x7fff7effd700 (LWP 13917) exited]
2014-03-17 22:15:09 13605 [Note] WSREP: 1.0 (Arch2): State transfer from 0.0 (Arch1) complete.
2014-03-17 22:15:09 13605 [Note] WSREP: Member 1 (Arch2) synced with group.
2014-03-17 22:15:43 13605 [Note] WSREP: cluster conflict due to high priority abort for threads:
2014-03-17 22:15:43 13605 [Note] WSREP: Winning thread:
   THD: 3, mode: applier, state: executing, conflict: no conflict, seqno: 561481
   SQL: (null)
2014-03-17 22:15:43 13605 [Note] WSREP: Victim thread:
   THD: 5, mode: local, state: idle, conflict: no conflict, seqno: -1
   SQL: (null)
2014-03-17 22:15:43 13605 [Note] WSREP: BF kill (1, seqno: 561481), victim: (5) trx: 1792773
2014-03-17 22:15:43 13605 [Note] WSREP: Aborting query: void
2014-03-17 22:15:43 13605 [Note] WSREP: kill IDLE for 1792773
2014-03-17 22:15:43 13605 [Note] WSREP: enqueuing trx abort for (5)
2014-03-17 22:15:43 13605 [Note] WSREP: signaling aborter
2014-03-17 22:15:43 13605 [Note] WSREP: WSREP rollback thread wakes for signal
2014-03-17 22:15:43 13605 [Note] WSREP: client rollback due to BF abort for (5), query: (null)
2014-03-17 22:15:43 13605 [Note] WSREP: WSREP rollbacker aborted thd: (5 140736823138048)
2014-03-17 22:15:45 13605 [Note] WSREP: Deadlock error for: (null)
InnoDB: sync levels should be > 298 but a level is 297
Mutex '&trx->mutex'
InnoDB: Locked mutex: addr 0x7fffb8037a80 thread 140736630683392 file /media/Oort/ncode/percona-xtradb-cluster/pxc56/Percona-Server/storage/innobase/lock/lock0lock.cc line 2455
InnoDB: sync_thread_levels_g(array, 298) does not hold!
2014-03-17 22:16:05 7fffcce0f700  InnoDB: Assertion failure in thread 140736630683392 in file sync0sync.cc line 1268
InnoDB: We intentionally generate a memory trap.
InnoDB: Submit a detailed bug report to http://bugs.mysql.com.
InnoDB: If you get repeated assertion failures or crashes, even
InnoDB: immediately after the mysqld startup, there may be
InnoDB: corruption in the InnoDB tablespace. Please refer to
InnoDB: http://dev.mysql.com/doc/refman/5.6/en/forcing-innodb-recovery.html
InnoDB: about forcing recovery.


But, this is only in UNIV_DEBUG.


#0  0x00007ffff5f5e389 in raise () from /usr/lib/libc.so.6
#1  0x00007ffff5f5f788 in abort () from /usr/lib/libc.so.6
#2  0x0000000000a93e44 in sync_array_wait_event (arr=0x16d3630, index=0) at /media/Oort/ncode/percona-xtradb-cluster/pxc56/Percona-Server/storage/innobase/sync/sync0arr.cc:426
#3  0x0000000000a96fd0 in mutex_spin_wait (_mutex=0x2d85708, high_priority=high_priority@entry=false,
    file_name=file_name@entry=0xd62920 "/media/Oort/ncode/percona-xtradb-cluster/pxc56/Percona-Server/storage/innobase/lock/lock0lock.cc", line=1642)
    at /media/Oort/ncode/percona-xtradb-cluster/pxc56/Percona-Server/storage/innobase/sync/sync0sync.cc:671
#4  0x00000000009d6ca6 in mutex_enter_func (mutex=<optimized out>, file_name=file_name@entry=0xd62920 "/media/Oort/ncode/percona-xtradb-cluster/pxc56/Percona-Server/storage/innobase/lock/lock0lock.cc",
    line=<optimized out>) at /media/Oort/ncode/percona-xtradb-cluster/pxc56/Percona-Server/storage/innobase/include/sync0sync.ic:273
#5  0x00000000009d6d70 in pfs_mutex_enter_func (mutex=0x2d85708, file_name=file_name@entry=0xd62920 "/media/Oort/ncode/percona-xtradb-cluster/pxc56/Percona-Server/storage/innobase/lock/lock0lock.cc",
    line=line@entry=1642) at /media/Oort/ncode/percona-xtradb-cluster/pxc56/Percona-Server/storage/innobase/include/sync0sync.ic:350
#6  0x00000000009dc86b in wsrep_kill_victim (trx=0x7fffb8037a78, lock=0x7fff50024ac0) at /media/Oort/ncode/percona-xtradb-cluster/pxc56/Percona-Server/storage/innobase/lock/lock0lock.cc:1642
#7  0x00000000009dcee9 in lock_rec_other_has_conflicting (mode=mode@entry=1027, block=block@entry=0x7fff98bb1258, heap_no=heap_no@entry=7, trx=trx@entry=0x7fffb8037a78)
    at /media/Oort/ncode/percona-xtradb-cluster/pxc56/Percona-Server/storage/innobase/lock/lock0lock.cc:1706
#8  0x00000000009e1c6d in lock_rec_lock_slow (impl=0, impl@entry=140736280623736, mode=mode@entry=1027, block=block@entry=0x7fff98bb1258, heap_no=heap_no@entry=7, index=index@entry=0x7fff50024fc8,
    thr=thr@entry=0x7fff5001c848) at /media/Oort/ncode/percona-xtradb-cluster/pxc56/Percona-Server/storage/innobase/lock/lock0lock.cc:2486
#9  0x00000000009e1e36 in lock_rec_lock (impl=140736280623736, impl@entry=0, mode=mode@entry=1027, block=block@entry=0x7fff98bb1258, heap_no=heap_no@entry=7, index=index@entry=0x7fff50024fc8,
    thr=thr@entry=0x7fff5001c848) at /media/Oort/ncode/percona-xtradb-cluster/pxc56/Percona-Server/storage/innobase/lock/lock0lock.cc:2580
#10 0x00000000009e2928 in lock_clust_rec_read_check_and_lock (flags=flags@entry=0, block=block@entry=0x7fff98bb1258, rec=rec@entry=0x7fffb790c10a "", index=index@entry=0x7fff50024fc8,
    offsets=offsets@entry=0x7fffcce0b700, mode=mode@entry=LOCK_X, gap_mode=gap_mode@entry=1024, thr=thr@entry=0x7fff5001c848)
    at /media/Oort/ncode/percona-xtradb-cluster/pxc56/Percona-Server/storage/innobase/lock/lock0lock.cc:6827
#11 0x0000000000a6fc74 in sel_set_rec_lock (block=0x7fff98bb1258, rec=rec@entry=0x7fffb790c10a "", index=index@entry=0x7fff50024fc8, offsets=offsets@entry=0x7fffcce0b700, mode=mode@entry=3, type=type@entry=1024,
    thr=thr@entry=0x7fff5001c848) at /media/Oort/ncode/percona-xtradb-cluster/pxc56/Percona-Server/storage/innobase/row/row0sel.cc:1012
#12 0x0000000000a741f2 in row_search_for_mysql (buf=buf@entry=0x7fff5001b900 "\377\004", mode=mode@entry=2, prebuilt=0x7fff5001be78, match_mode=match_mode@entry=1, direction=direction@entry=0)
    at /media/Oort/ncode/percona-xtradb-cluster/pxc56/Percona-Server/storage/innobase/row/row0sel.cc:4506
#13 0x00000000009aed11 in ha_innobase::index_read (this=0x7fff50019bd0, buf=0x7fff5001b900 "\377\004", key_ptr=<optimized out>, key_len=<optimized out>, find_flag=<optimized out>)
    at /media/Oort/ncode/percona-xtradb-cluster/pxc56/Percona-Server/storage/innobase/handler/ha_innodb.cc:8693
#14 0x000000000099987b in ha_innobase::rnd_pos (this=0x7fff50019bd0, buf=0x7fff5001b900 "\377\004", pos=0x7fff5001bb90 "\004")
    at /media/Oort/ncode/percona-xtradb-cluster/pxc56/Percona-Server/storage/innobase/handler/ha_innodb.cc:9225
#15 0x000000000064fa10 in handler::ha_rnd_pos (this=0x7fff50019bd0, buf=0x7fff5001b900 "\377\004", pos=0x7fff5001bb90 "\004") at /media/Oort/ncode/percona-xtradb-cluster/pxc56/Percona-Server/sql/handler.cc:2824
#16 0x000000000090eee8 in Rows_log_event::do_index_scan_and_update (this=this@entry=0x7fffb8037770, rli=rli@entry=0x7fffb800bef0)
    at /media/Oort/ncode/percona-xtradb-cluster/pxc56/Percona-Server/sql/log_event.cc:10445
#17 0x0000000000911c34 in Rows_log_event::do_apply_event (this=0x7fffb8037770, rli=0x7fffb800bef0) at /media/Oort/ncode/percona-xtradb-cluster/pxc56/Percona-Server/sql/log_event.cc:11247
#18 0x000000000090b7de in Log_event::apply_event (this=this@entry=0x7fffb8037770, rli=0x7fffb800bef0) at /media/Oort/ncode/percona-xtradb-cluster/pxc56/Percona-Server/sql/log_event.cc:2997
#19 0x0000000000643989 in wsrep_apply_events (thd=thd@entry=0x7fffb80009a0, events_buf=events_buf@entry=0x7fffcff17b6c, buf_len=0, buf_len@entry=172)
    at /media/Oort/ncode/percona-xtradb-cluster/pxc56/Percona-Server/sql/wsrep_applier.cc:150
#20 0x0000000000643eef in wsrep_apply_cb (ctx=0x7fffb80009a0, buf=0x7fffcff17b6c, buf_len=172, flags=<optimized out>, meta=<optimized out>)
    at /media/Oort/ncode/percona-xtradb-cluster/pxc56/Percona-Server/sql/wsrep_applier.cc:226
#21 0x00007fffd809b758 in galera::TrxHandle::apply (this=this@entry=0x7fffb8036a20, recv_ctx=recv_ctx@entry=0x7fffb80009a0,
    apply_cb=apply_cb@entry=0x643e20 <wsrep_apply_cb(void*, void const*, unsigned long, unsigned int, wsrep_trx_meta const*)>, meta=...) at galera/src/trx_handle.cpp:304
#22 0x00007fffd80d462d in apply_trx_ws (recv_ctx=recv_ctx@entry=0x7fffb80009a0, apply_cb=0x643e20 <wsrep_apply_cb(void*, void const*, unsigned long, unsigned int, wsrep_trx_meta const*)>,
    commit_cb=0x644050 <wsrep_commit_cb(void*, unsigned int, wsrep_trx_meta const*, bool*, bool)>, trx=..., meta=...) at galera/src/replicator_smm.cpp:39
#23 0x00007fffd80d6800 in galera::ReplicatorSMM::apply_trx (this=this@entry=0x1678290, recv_ctx=recv_ctx@entry=0x7fffb80009a0, trx=trx@entry=0x7fffb8036a20) at galera/src/replicator_smm.cpp:419
#24 0x00007fffd80d933e in galera::ReplicatorSMM::process_trx (this=0x1678290, recv_ctx=0x7fffb80009a0, trx=0x7fffb8036a20) at galera/src/replicator_smm.cpp:1210
#25 0x00007fffd80b84b9 in galera::GcsActionSource::dispatch (this=this@entry=0x1678878, recv_ctx=recv_ctx@entry=0x7fffb80009a0, act=..., exit_loop=@0x7fffcce0e2e0: false) at galera/src/gcs_action_source.cpp:118
#26 0x00007fffd80b93ac in galera::GcsActionSource::process (this=0x1678878, recv_ctx=0x7fffb80009a0, exit_loop=@0x7fffcce0e2e0: false) at galera/src/gcs_action_source.cpp:177
#27 0x00007fffd80d955b in galera::ReplicatorSMM::async_recv (this=0x1678290, recv_ctx=0x7fffb80009a0) at galera/src/replicator_smm.cpp:354
#28 0x00007fffd80e7618 in galera_recv (gh=<optimized out>, recv_ctx=<optimized out>) at galera/src/wsrep_provider.cpp:231
#29 0x0000000000644671 in wsrep_replication_process (thd=0x7fffb80009a0) at /media/Oort/ncode/percona-xtradb-cluster/pxc56/Percona-Server/sql/wsrep_thd.cc:309
#30 0x000000000062e74f in start_wsrep_THD (arg=0x644600 <wsrep_replication_process(THD*)>) at /media/Oort/ncode/percona-xtradb-cluster/pxc56/Percona-Server/sql/mysqld.cc:5502
#31 0x00007ffff7bc70a2 in start_thread () from /usr/lib/libpthread.so.0
#32 0x00007ffff600ed1d in clone () from /usr/lib/libc.so.6