refs codership/mysql-wsrep#233 - avoiding the race condition, by not grabbing thd->LOCK_wsrep_thd for   accessing thd->wsrep_exec_mode. The caller is same thread and exec mode   can only be changed by self.
refs codership/mysql-wsrep#233
- avoiding the race condition, by not grabbing thd->LOCK_wsrep_thd for
  accessing thd->wsrep_exec_mode. The caller is same thread and exec mode
  can only be changed by self.

natsys/mariadb_10.2,flynn1973/mariadb-aix,ollie314/server,ollie314/server,flynn1973/mariadb-aix,natsys/mariadb_10.2,natsys/mariadb_10.2,ollie314/server,natsys/mariadb_10.2,flynn1973/mariadb-aix,ollie314/server,ollie314/server,ollie314/server,ollie314/server,flynn1973/mariadb-aix,ollie314/server,ollie314/server,flynn1973/mariadb-aix,flynn1973/mariadb-aix,ollie314/server,natsys/mariadb_10.2,flynn1973/mariadb-aix,natsys/mariadb_10.2,natsys/mariadb_10.2,natsys/mariadb_10.2,natsys/mariadb_10.2,flynn1973/mariadb-aix,natsys/mariadb_10.2,flynn1973/mariadb-aix,ollie314/server,flynn1973/mariadb-aix,natsys/mariadb_10.2,flynn1973/mariadb-aix