just built 10.0.21 and thought it can't be wrong to report the faling test below - this is not new and virtually forever - however, maybe woth a look ______________________________________________________________ /usr/bin/su -c 'cd /usr/share/mysql-test; ./mysql-test-run.pl --default-myisam --parallel=1 --max-test-fail=0 --mysqld=--binlog-format=mixed --skip-ndb --force' mysql ______________________________________________________________ rpl.rpl_not_null_innodb 'row,xtradb' [ fail ] Test ended at 2015-08-06 21:30:45 CURRENT_TEST: rpl.rpl_not_null_innodb mysqltest: In included file "./include/rpl_init.inc": included from ./include/master-slave.inc at line 38: included from /usr/share/mysql-test/suite/rpl/t/rpl_not_null_innodb.test at line 15: At line 179: query 'SET GLOBAL gtid_slave_pos= ""' failed: 1198: This operation cannot be performed as you have a running slave ''; run STOP SLAVE '' first The result from queries just before the failure was: include/master-slave.inc - saving '/usr/share/mysql-test/var/log/rpl.rpl_not_null_innodb-row,xtradb/' to '/usr/share/mysql-test/var/log/rpl.rpl_not_null_innodb-row,xtradb/'