When executing the test case from LP1372986 , the master sometimes hangs with the following interesting threads:
Thread 3 (Thread 0x7fd9d0427700 (LWP 11929)):
#0 0x0000003f2e00bcf0 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1 0x00007fd9eb39b645 in wait (this=0x7fd9d0424650, cond=...) at galerautils/src/gu_lock.hpp:56
#2 galera::Monitor<galera::ReplicatorSMM::CommitOrder>::enter (this=this@entry=0x2998b00, obj=...) at galera/src/monitor.hpp:120
#3 0x00007fd9eb395cd8 in galera::ReplicatorSMM::pre_commit (this=0x2997eb0, trx=0x7fd9a80be5b0, meta=<optimized out>) at galera/src/replicator_smm.cpp:764
#4 0x00007fd9eb3a6580 in galera_pre_commit (gh=<optimized out>, conn_id=7, trx_handle=<optimized out>, flags=<optimized out>, meta=0x2c00080) at galera/src/wsrep_provider.cpp:505
#5 0x00000000007bb0e0 in wsrep_run_wsrep_commit (thd=0x2bfdff0, hton=<optimized out>, all=<optimized out>) at /home/philips/git/codership-mysql/sql/wsrep_hton.cc:434
#6 0x00000000005c4fcd in ha_prepare_low (thd=0x2bfdff0, all=false) at /home/philips/git/codership-mysql/sql/handler.cc:2150
#7 0x00000000005c4393 in ha_commit_trans (thd=thd@entry=0x2bfdff0, all=all@entry=false, ignore_global_read_lock=ignore_global_read_lock@entry=false) at /home/philips/git/codership-mysql/sql/handler.cc:1457
#8 0x00000000007a23c7 in trans_commit_stmt (thd=thd@entry=0x2bfdff0) at /home/philips/git/codership-mysql/sql/transaction.cc:473
#9 0x0000000000712e5c in mysql_execute_command (thd=thd@entry=0x2bfdff0) at /home/philips/git/codership-mysql/sql/sql_parse.cc:5444
#10 0x000000000071a538 in mysql_parse (parser_state=0x7fd9d0426650, length=65, rawbuf=0x7fd9a8004bd0 "INSERT INTO t1 (f2) SELECT 1 FROM ten AS a1, ten AS a2, ten AS a3", thd=0x2bfdff0) at /home/philips/git/codership-mysql/sql/sql_parse.cc:6815
#11 wsrep_mysql_parse (thd=thd@entry=0x2bfdff0, rawbuf=0x7fd9a8004bd0 "INSERT INTO t1 (f2) SELECT 1 FROM ten AS a1, ten AS a2, ten AS a3", length=65, parser_state=parser_state@entry=0x7fd9d0426650) at /home/philips/git/codership-mysql/sql/sql_parse.cc:6595
#12 0x000000000071bd3f in dispatch_command (command=command@entry=COM_QUERY, thd=thd@entry=0x2bfdff0, packet=packet@entry=0x2c72021 "INSERT INTO t1 (f2) SELECT 1 FROM ten AS a1, ten AS a2, ten AS a3;", packet_length=packet_length@entry=66) at /home/philips/git/codership-mysql/sql/sql_parse.cc:1525
#13 0x000000000071dc22 in do_command (thd=0x2bfdff0) at /home/philips/git/codership-mysql/sql/sql_parse.cc:1114
#14 0x00000000006e1c65 in do_handle_one_connection (thd_arg=thd_arg@entry=0x2bfdff0) at /home/philips/git/codership-mysql/sql/sql_connect.cc:1007
#15 0x00000000006e1cc9 in handle_one_connection (arg=arg@entry=0x2bfdff0) at /home/philips/git/codership-mysql/sql/sql_connect.cc:916
#16 0x0000000000957240 in pfs_spawn_thread (arg=0x2c52a40) at /home/philips/git/codership-mysql/storage/perfschema/pfs.cc:1860
#17 0x0000003f2e007f35 in start_thread () from /lib64/libpthread.so.0
#18 0x0000003f2d8f4c3d in clone () from /lib64/libc.so.6
and
Thread 21 (Thread 0x7fd9e004c700 (LWP 11760)):
#0 0x0000003f2e00bcf0 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1 0x0000000000a2ad71 in os_cond_wait (fast_mutex=0x7fd9cc02ac70, cond=0x7fd9cc02acb0) at /home/philips/git/codership-mysql/storage/innobase/os/os0sync.cc:214
#2 os_event_wait_low (event=0x7fd9cc02ac70, reset_sig_count=<optimized out>, reset_sig_count@entry=0) at /home/philips/git/codership-mysql/storage/innobase/os/os0sync.cc:610
#3 0x0000000000a10c22 in lock_wait_suspend_thread (thr=thr@entry=0x7fd9cc0282f0) at /home/philips/git/codership-mysql/storage/innobase/lock/lock0wait.cc:344
#4 0x0000000000a67e34 in row_mysql_handle_errors (savept=0x0, savept=0x0, thr=0x7fd9cc0282f0, trx=0x7fd9cc0289f8, new_err=<synthetic pointer>) at /home/philips/git/codership-mysql/storage/innobase/row/row0mysql.cc:631
#5 row_lock_table_autoinc_for_mysql (prebuilt=0x7fd9cc027bf8) at /home/philips/git/codership-mysql/storage/innobase/row/row0mysql.cc:1126
#6 0x00000000009dcc1c in ha_innobase::innobase_lock_autoinc (this=0x7fd9cc025c90) at /home/philips/git/codership-mysql/storage/innobase/handler/ha_innodb.cc:6907
#7 0x00000000009e183b in innobase_set_max_autoinc (auto_inc=3, this=0x7fd9cc025c90) at /home/philips/git/codership-mysql/storage/innobase/handler/ha_innodb.cc:6958
#8 ha_innobase::write_row (this=0x7fd9cc025c90, record=0x7fd9cc0277b0 "\375\002") at /home/philips/git/codership-mysql/storage/innobase/handler/ha_innodb.cc:7273
#9 0x00000000005cb48f in handler::ha_write_row (this=0x7fd9cc025c90, buf=0x7fd9cc0277b0 "\375\002") at /home/philips/git/codership-mysql/sql/handler.cc:7370
#10 0x00000000008b6715 in Write_rows_log_event::write_row (this=this@entry=0x7fd9cc023120, rli=rli@entry=0x7fd9cc00baf0, overwrite=<optimized out>) at /home/philips/git/codership-mysql/sql/log_event.cc:12600
#11 0x00000000008b6a85 in Write_rows_log_event::do_exec_row (this=0x7fd9cc023120, rli=0x7fd9cc00baf0) at /home/philips/git/codership-mysql/sql/log_event.cc:12789
#12 0x00000000008a2996 in Rows_log_event::do_apply_row (this=this@entry=0x7fd9cc023120, rli=rli@entry=0x7fd9cc00baf0) at /home/philips/git/codership-mysql/sql/log_event.cc:10189
#13 0x00000000008b3bff in Rows_log_event::do_apply_event (this=0x7fd9cc023120, rli=0x7fd9cc00baf0) at /home/philips/git/codership-mysql/sql/log_event.cc:11326
#14 0x00000000008acabe in Log_event::apply_event (this=this@entry=0x7fd9cc023120, rli=0x7fd9cc00baf0) at /home/philips/git/codership-mysql/sql/log_event.cc:3024
#15 0x00000000005bd31c in wsrep_apply_events (buf_len=859, events_buf=0x7fd9e31b894e, thd=0x7fd9cc000990) at /home/philips/git/codership-mysql/sql/wsrep_applier.cc:151
#16 wsrep_apply_cb (ctx=0x7fd9cc000990, buf=0x7fd9e31b894e, buf_len=9177, flags=<optimized out>, meta=<optimized out>) at /home/philips/git/codership-mysql/sql/wsrep_applier.cc:238
#17 0x00007fd9eb3556b8 in galera::TrxHandle::apply (this=this@entry=0x7fd9cc00ee10, recv_ctx=recv_ctx@entry=0x7fd9cc000990, apply_cb=apply_cb@entry=0x5bcda0 <wsrep_apply_cb(void*, void const*, unsigned long, unsigned int, wsrep_trx_meta const*)>, meta=...) at galera/src/trx_handle.cpp:304
#18 0x00007fd9eb39163d in apply_trx_ws (recv_ctx=recv_ctx@entry=0x7fd9cc000990, apply_cb=0x5bcda0 <wsrep_apply_cb(void*, void const*, unsigned long, unsigned int, wsrep_trx_meta const*)>, commit_cb=0x5bd780 <wsrep_commit_cb(void*, unsigned int, wsrep_trx_meta const*, bool*, bool)>, trx=..., meta=...) at galera/src/replicator_smm.cpp:37
#19 0x00007fd9eb393870 in galera::ReplicatorSMM::apply_trx (this=this@entry=0x2997eb0, recv_ctx=recv_ctx@entry=0x7fd9cc000990, trx=trx@entry=0x7fd9cc00ee10) at galera/src/replicator_smm.cpp:420
#20 0x00007fd9eb39665e in galera::ReplicatorSMM::process_trx (this=0x2997eb0, recv_ctx=0x7fd9cc000990, trx=0x7fd9cc00ee10) at galera/src/replicator_smm.cpp:1212
#21 0x00007fd9eb373f98 in galera::GcsActionSource::dispatch (this=this@entry=0x2998508, recv_ctx=recv_ctx@entry=0x7fd9cc000990, act=..., exit_loop=@0x7fd9e004b2e0: false) at galera/src/gcs_action_source.cpp:116
#22 0x00007fd9eb37570c in galera::GcsActionSource::process (this=0x2998508, recv_ctx=0x7fd9cc000990, exit_loop=@0x7fd9e004b2e0: false) at galera/src/gcs_action_source.cpp:180
#23 0x00007fd9eb396b7b in galera::ReplicatorSMM::async_recv (this=0x2997eb0, recv_ctx=0x7fd9cc000990) at galera/src/replicator_smm.cpp:355
#24 0x00007fd9eb3a5748 in galera_recv (gh=<optimized out>, recv_ctx=<optimized out>) at galera/src/wsrep_provider.cpp:231
#25 0x00000000005bdcd0 in wsrep_replication_process (thd=0x7fd9cc000990) at /home/philips/git/codership-mysql/sql/wsrep_thd.cc:309
#26 0x00000000005a715b in start_wsrep_THD (arg=0x5bdc80 <wsrep_replication_process(THD*)>) at /home/philips/git/codership-mysql/sql/mysqld.cc:5373
#27 0x0000003f2e007f35 in start_thread () from /lib64/libpthread.so.0
#28 0x0000003f2d8f4c3d in clone () from /lib64/libc.so.6
innodb-