MDEV-21360 debug_dbug pre-test value restoration issues

28 files changed, 69 insertions, 44 deletions

diff --git a/mysql-test/suite/rpl/r/kill_race_condition.result b/mysql-test/suite/rpl/r/kill_race_condition.result
index 1181eb0b0b1..4da61a78eb9 100644
--- a/mysql-test/suite/rpl/r/kill_race_condition.result
+++ b/mysql-test/suite/rpl/r/kill_race_condition.result
@@ -4,6 +4,7 @@ connection master;
 create table t1 (a int);
 connection slave;
 connection slave;
+set @saved_dbug = @@global.debug_dbug;
 set global debug_dbug='d,rows_log_event_before_open_table';
 connection master;
 insert t1 values (1),(2),(3);
@@ -13,7 +14,7 @@ kill slave_sql_thread;
 set debug_sync='now SIGNAL go_ahead_sql';
 include/wait_for_slave_sql_error.inc [errno=1927]
 Last_SQL_Error = Error executing row event: 'Connection was killed'
-set global debug_dbug='';
+set @@global.debug_dbug = @saved_dbug;
 set debug_sync='RESET';
 connection master;
 drop table t1;
diff --git a/mysql-test/suite/rpl/r/rpl_bug33931.result b/mysql-test/suite/rpl/r/rpl_bug33931.result
index 74ba945b027..a3d60a672a9 100644
--- a/mysql-test/suite/rpl/r/rpl_bug33931.result
+++ b/mysql-test/suite/rpl/r/rpl_bug33931.result
@@ -5,10 +5,11 @@ call mtr.add_suppression("Failed during slave I/O thread initialization");
 call mtr.add_suppression("Slave SQL.*Failed during slave thread initialization.* 1593");
 include/stop_slave.inc
 reset slave;
+set @saved_dbug = @@global.debug_dbug;
 SET GLOBAL debug_dbug="d,simulate_io_slave_error_on_init,simulate_sql_slave_error_on_init";
 start slave;
 include/wait_for_slave_sql_error.inc [errno=1593]
 Last_SQL_Error = 'Failed during slave thread initialization'
-SET GLOBAL debug_dbug="";
+set @@global.debug_dbug = @saved_dbug;
 RESET SLAVE;
 include/rpl_end.inc
diff --git a/mysql-test/suite/rpl/r/rpl_bug41902.result b/mysql-test/suite/rpl/r/rpl_bug41902.result
index 8667795bd77..de594d39a98 100644
--- a/mysql-test/suite/rpl/r/rpl_bug41902.result
+++ b/mysql-test/suite/rpl/r/rpl_bug41902.result
@@ -2,6 +2,7 @@ include/master-slave.inc
 [connection master]
 connection slave;
 stop slave;
+set @saved_dbug = @@global.debug_dbug;
 SET @@debug_dbug="d,simulate_find_log_pos_error";
 reset slave;
 ERROR HY000: Target log not found in binlog index
@@ -19,6 +20,7 @@ SET @@debug_dbug="";
 reset slave;
 change master to master_host='dummy';
 connection master;
+set @saved_dbug_m = @@global.debug_dbug;
 SET @@debug_dbug="d,simulate_find_log_pos_error";
 reset master;
 ERROR HY000: Target log not found in binlog index
@@ -29,6 +31,7 @@ purge binary logs to 'master-bin.000001';
 ERROR HY000: Target log not found in binlog index
 SET @@debug_dbug="";
 purge binary logs to 'master-bin.000001';
+set @@global.debug_dbug = @saved_dbug;
 ==== clean up ====
 CHANGE MASTER TO MASTER_HOST = '127.0.0.1';
 include/rpl_end.inc
diff --git a/mysql-test/suite/rpl/r/rpl_checksum.result b/mysql-test/suite/rpl/r/rpl_checksum.result
index a74b688d722..7a8644f6bea 100644
--- a/mysql-test/suite/rpl/r/rpl_checksum.result
+++ b/mysql-test/suite/rpl/r/rpl_checksum.result
@@ -76,6 +76,7 @@ connection master;
 set @@global.binlog_checksum = CRC32;
 insert into t1 values (1) /* will not be applied on slave due to simulation */;
 connection slave;
+set @saved_dbug = @@global.debug_dbug;
 set @@global.debug_dbug='d,simulate_slave_unaware_checksum';
 start slave;
 include/wait_for_slave_io_error.inc [errno=1236]
@@ -83,15 +84,16 @@ Last_IO_Error = 'Got fatal error 1236 from master when reading data from binary
 select count(*) as zero from t1;
 zero
 0
-set @@global.debug_dbug='';
+set @@global.debug_dbug = @saved_dbug;
 connection slave;
 include/start_slave.inc
 connection master;
 set @@global.master_verify_checksum = 1;
+set @save_dbug = @@session.debug_dbug;
 set @@session.debug_dbug='d,simulate_checksum_test_failure';
 show binlog events;
 ERROR HY000: Error when executing command SHOW BINLOG EVENTS: Wrong offset or I/O error
-set @@session.debug_dbug='';
+set debug_dbug= @save_dbug;
 set @@global.master_verify_checksum = default;
 connection slave;
 connection slave;
@@ -99,10 +101,11 @@ include/stop_slave.inc
 connection master;
 create table t2 (a int);
 connection slave;
+set @saved_dbug = @@global.debug_dbug;
 set @@global.debug_dbug='d,simulate_checksum_test_failure';
 start slave io_thread;
 include/wait_for_slave_io_error.inc [errno=1595,1913]
-set @@global.debug_dbug='';
+set @@global.debug_dbug = @saved_dbug;
 start slave io_thread;
 include/wait_for_slave_param.inc [Read_Master_Log_Pos]
 set @@global.slave_sql_verify_checksum = 1;
@@ -110,7 +113,7 @@ set @@global.debug_dbug='d,simulate_checksum_test_failure';
 start slave sql_thread;
 include/wait_for_slave_sql_error.inc [errno=1593]
 Last_SQL_Error = 'Error initializing relay log position: I/O error reading event at position 4'
-set @@global.debug_dbug='';
+set @@global.debug_dbug = @saved_dbug;
 include/start_slave.inc
 connection master;
 connection slave;
diff --git a/mysql-test/suite/rpl/r/rpl_corruption.result b/mysql-test/suite/rpl/r/rpl_corruption.result
index 25a82fd60cd..db72bb304fc 100644
--- a/mysql-test/suite/rpl/r/rpl_corruption.result
+++ b/mysql-test/suite/rpl/r/rpl_corruption.result
@@ -13,6 +13,7 @@ connection master;
 CREATE TABLE t1 (a INT NOT NULL PRIMARY KEY, b VARCHAR(10), c VARCHAR(100));
 include/stop_slave.inc
 # 2. Corruption in master binlog and SHOW BINLOG EVENTS
+set @saved_dbug = @@global.debug_dbug;
 SET GLOBAL debug_dbug="+d,corrupt_read_log_event_char";
 SHOW BINLOG EVENTS;
 ERROR HY000: Error when executing command SHOW BINLOG EVENTS: Wrong offset or I/O error
@@ -55,9 +56,9 @@ connection slave;
 include/diff_tables.inc [master:test.t1, slave:test.t1]
 # 8. Clean up
 connection master;
-SET GLOBAL debug_dbug= "";
+set @@global.debug_dbug = @saved_dbug;
 SET GLOBAL master_verify_checksum = @old_master_verify_checksum;
 DROP TABLE t1;
 connection slave;
-SET GLOBAL debug_dbug= "";
+set @@global.debug_dbug = @saved_dbug;
 include/rpl_end.inc
diff --git a/mysql-test/suite/rpl/r/rpl_heartbeat_debug.result b/mysql-test/suite/rpl/r/rpl_heartbeat_debug.result
index cf26c3bf04a..dc45c0b9ab3 100644
--- a/mysql-test/suite/rpl/r/rpl_heartbeat_debug.result
+++ b/mysql-test/suite/rpl/r/rpl_heartbeat_debug.result
@@ -7,7 +7,7 @@ set @@global.slave_net_timeout= 10;
 show status like 'Slave_heartbeat_period';;
 Variable_name	Slave_heartbeat_period
 Value	60.000
-SET @save_dbug= @@GLOBAL.debug_dbug;
+SET @saved_dbug= @@GLOBAL.debug_dbug;
 SET GLOBAL debug_dbug="+d,simulate_slave_heartbeat_network_error";
 CALL mtr.add_suppression('SET @master_heartbeat_period to master failed with error');
 CALL mtr.add_suppression('Master command COM_REGISTER_SLAVE failed: failed registering on master, reconnecting to try again');
@@ -25,7 +25,7 @@ connection master;
 drop table t1;
 connection slave;
 include/stop_slave.inc
-SET GLOBAL debug_dbug=@save_dbug;
+SET GLOBAL debug_dbug=@saved_dbug;
 set @@global.slave_net_timeout= @restore_slave_net_timeout;
 include/start_slave.inc
 include/rpl_end.inc
diff --git a/mysql-test/suite/rpl/r/rpl_incident.result b/mysql-test/suite/rpl/r/rpl_incident.result
index 8fb4aa907cc..6dbe4417c5a 100644
--- a/mysql-test/suite/rpl/r/rpl_incident.result
+++ b/mysql-test/suite/rpl/r/rpl_incident.result
@@ -14,6 +14,7 @@ a
 1
 2
 3
+set @saved_dbug = @@global.debug_dbug;
 SET GLOBAL debug_dbug= '+d,incident_database_resync_on_replace,*';
 REPLACE INTO t1 VALUES (4);
 SELECT * FROM t1;
@@ -22,6 +23,7 @@ a
 2
 3
 4
+set @@global.debug_dbug = @saved_dbug;
 connection slave;
 call mtr.add_suppression("Slave SQL.*The incident LOST_EVENTS occurred on the master.* 1590");
 include/wait_for_slave_sql_error.inc [errno=1590]
diff --git a/mysql-test/suite/rpl/r/rpl_init_slave_errors.result b/mysql-test/suite/rpl/r/rpl_init_slave_errors.result
index 91742814b4c..fc23734c645 100644
--- a/mysql-test/suite/rpl/r/rpl_init_slave_errors.result
+++ b/mysql-test/suite/rpl/r/rpl_init_slave_errors.result
@@ -4,12 +4,13 @@ connection slave;
 stop slave;
 reset slave;
 connection slave;
+set @saved_dbug = @@global.debug_dbug;
 SET GLOBAL debug_dbug= "d,simulate_io_slave_error_on_init,simulate_sql_slave_error_on_init";
 start slave;
 include/wait_for_slave_sql_error.inc [errno=1593]
 Last_SQL_Error = 'Failed during slave thread initialization'
 call mtr.add_suppression("Failed during slave.* thread initialization");
-SET GLOBAL debug_dbug= "";
+set @@global.debug_dbug = @saved_dbug;
 connection slave;
 reset slave;
 SET GLOBAL init_slave= "garbage";
diff --git a/mysql-test/suite/rpl/r/rpl_row_big_table_id.result b/mysql-test/suite/rpl/r/rpl_row_big_table_id.result
index 6fece52dda3..8d22289370b 100644
--- a/mysql-test/suite/rpl/r/rpl_row_big_table_id.result
+++ b/mysql-test/suite/rpl/r/rpl_row_big_table_id.result
@@ -2,6 +2,7 @@ include/master-slave.inc
 [connection master]
 connection master;
 include/rpl_restart_server.inc [server_number=1]
+set @saved_dbug = @@session.debug_dbug;
 SET @@debug_dbug="d,simulate_big_table_id";
 CREATE TABLE t (a int);
 INSERT INTO t SET a= 0;
@@ -42,5 +43,6 @@ master-bin.000002	#	Query	1	#	COMMIT
 connection slave;
 connection master;
 DROP TABLE t;
+set debug_dbug= @saved_dbug;
 connection slave;
 include/rpl_end.inc
diff --git a/mysql-test/suite/rpl/r/rpl_row_find_row_debug.result b/mysql-test/suite/rpl/r/rpl_row_find_row_debug.result
index 491fb68615c..118266399fb 100644
--- a/mysql-test/suite/rpl/r/rpl_row_find_row_debug.result
+++ b/mysql-test/suite/rpl/r/rpl_row_find_row_debug.result
@@ -2,6 +2,7 @@ include/master-slave.inc
 [connection master]
 connection slave;
 include/stop_slave.inc
+set @saved_dbug = @@global.debug_dbug;
 SET GLOBAL log_warnings = 2;
 SET GLOBAL debug_dbug="d,inject_long_find_row_note";
 include/start_slave.inc
@@ -17,7 +18,7 @@ connection slave;
 # Check if any note related to long DELETE_ROWS and UPDATE_ROWS appears in the error log
 Occurrences: update=1, delete=1
 include/stop_slave.inc
-SET GLOBAL debug_dbug = '';
+set @@global.debug_dbug = @saved_dbug;
 SET GLOBAL log_warnings = 2;
 include/start_slave.inc
 include/rpl_end.inc
diff --git a/mysql-test/suite/rpl/r/rpl_semi_sync_skip_repl.result b/mysql-test/suite/rpl/r/rpl_semi_sync_skip_repl.result
index ec9607148d4..62d4ea896ef 100644
--- a/mysql-test/suite/rpl/r/rpl_semi_sync_skip_repl.result
+++ b/mysql-test/suite/rpl/r/rpl_semi_sync_skip_repl.result
@@ -11,6 +11,7 @@ SET @@GLOBAL.rpl_semi_sync_slave_enabled = 1;
 include/start_slave.inc
 connection master;
 CREATE TABLE t1 (a INT) ENGINE=innodb;
+set @saved_dbug = @@global.debug_dbug;
 SET @@GLOBAL.debug_dbug="d,dbug_master_binlog_over_2GB";
 SET @@SESSION.skip_replication=1;
 INSERT INTO t1 SET a=1;
@@ -20,7 +21,7 @@ SET @@GLOBAL.debug_dbug="";
 FLUSH LOGS;
 connection slave;
 connection master;
-SET @@GLOBAL.debug_dbug=@@GLOBAL.debug_dbug;
+set @@global.debug_dbug = @saved_dbug;
 SET @@GLOBAL.rpl_semi_sync_master_timeout = 10000;
 SET @@GLOBAL.rpl_semi_sync_master_enabled = 0;
 connection master;
diff --git a/mysql-test/suite/rpl/r/rpl_show_slave_running.result b/mysql-test/suite/rpl/r/rpl_show_slave_running.result
index 729c718390a..a668b8b26f3 100644
--- a/mysql-test/suite/rpl/r/rpl_show_slave_running.result
+++ b/mysql-test/suite/rpl/r/rpl_show_slave_running.result
@@ -3,6 +3,7 @@ include/master-slave.inc
 connection slave;
 SET DEBUG_SYNC= 'RESET';
 include/stop_slave.inc
+set @saved_dbug = @@global.debug_dbug;
 set global debug_dbug= 'd,dbug.before_get_running_status_yes';
 Slave_running, Slave_IO_Running, Slave_SQL_Running, must be OFF, NO, NO in three following queries
 SHOW STATUS LIKE 'Slave_running';
@@ -34,7 +35,7 @@ Slave_running	ON
 Slave_IO_Running= Yes
 Slave_SQL_Running= Yes
 connection slave;
-set global debug_dbug= '';
+set @@global.debug_dbug = @saved_dbug;
 SET DEBUG_SYNC= 'RESET';
 End of tests
 include/rpl_end.inc
diff --git a/mysql-test/suite/rpl/r/rpl_slave_load_remove_tmpfile.result b/mysql-test/suite/rpl/r/rpl_slave_load_remove_tmpfile.result
index be2a17ea2b7..aac0d956e6c 100644
--- a/mysql-test/suite/rpl/r/rpl_slave_load_remove_tmpfile.result
+++ b/mysql-test/suite/rpl/r/rpl_slave_load_remove_tmpfile.result
@@ -1,6 +1,7 @@
 include/master-slave.inc
 [connection master]
 connection slave;
+set @saved_dbug = @@global.debug_dbug;
 SET @@global.debug_dbug= '+d,remove_slave_load_file_before_write';
 connection master;
 create table t1(a int not null auto_increment, b int, primary key(a)) engine=innodb;
@@ -21,5 +22,5 @@ call mtr.add_suppression("Slave: Can't get stat of .*");
 call mtr.add_suppression("Slave SQL: Error .Can.t get stat of.* error.* 13");
 call mtr.add_suppression("Slave: File.* not found.*");
 call mtr.add_suppression("Slave SQL: Error .File.* not found.* error.* 29");
-SET @@global.debug_dbug= '';
+set @@global.debug_dbug = @saved_dbug;
 include/rpl_end.inc
diff --git a/mysql-test/suite/rpl/r/rpl_stop_slave.result b/mysql-test/suite/rpl/r/rpl_stop_slave.result
index 2417c5abda8..e5ef1224033 100644
--- a/mysql-test/suite/rpl/r/rpl_stop_slave.result
+++ b/mysql-test/suite/rpl/r/rpl_stop_slave.result
@@ -15,6 +15,7 @@ include/stop_slave.inc
 # Suspend the INSERT statement in current transaction on SQL thread.
 # It guarantees that SQL thread is applying the transaction when
 # STOP SLAVE command launchs.
+set @saved_dbug = @@global.debug_dbug;
 SET GLOBAL debug_dbug= '+d,after_mysql_insert,*';
 include/start_slave.inc
 
@@ -74,6 +75,7 @@ connection master;
 connection slave;
 
 # Test end
+set @@global.debug_dbug = @saved_dbug;
 include/restart_slave.inc
 connection slave;
 call mtr.add_suppression("Slave SQL.*Request to stop slave SQL Thread received while applying a group that has non-transactional changes; waiting for completion of the group");
@@ -98,6 +100,7 @@ connection slave;
 include/stop_slave.inc
 connection master;
 include/stop_dump_threads.inc
+set @saved_dbug = @@global.debug_dbug;
 SET GLOBAL debug_dbug= '+d,dump_thread_wait_before_send_xid,*';
 connection slave;
 include/start_slave.inc
@@ -120,6 +123,7 @@ connection slave;
 include/wait_for_slave_to_stop.inc
 connection slave1;
 connection master;
+set @@global.debug_dbug = @saved_dbug;
 include/stop_dump_threads.inc
 connection slave1;
 include/start_slave.inc
diff --git a/mysql-test/suite/rpl/r/rpl_view_debug.result b/mysql-test/suite/rpl/r/rpl_view_debug.result
index 22032c3fb90..1f2f7f2ab15 100644
--- a/mysql-test/suite/rpl/r/rpl_view_debug.result
+++ b/mysql-test/suite/rpl/r/rpl_view_debug.result
@@ -21,6 +21,7 @@ Tables_in_test
 t1
 v1
 connection master;
+set @saved_dbug = @@session.debug_dbug;
 set @@debug_dbug="d,simulate_register_view_failure";
 CREATE VIEW v2 as SELECT * FROM t1;
 ERROR HY000: Out of memory; check if mysqld or some other process uses all available memory; if not, you may have to use 'ulimit' to allow mysqld to use more memory or you can add more swap space
@@ -36,4 +37,5 @@ v1
 connection master;
 DROP VIEW IF EXISTS v1;
 DROP TABLE t1;
+set debug_dbug= @saved_dbug;
 include/rpl_end.inc
diff --git a/mysql-test/suite/rpl/t/kill_race_condition.test b/mysql-test/suite/rpl/t/kill_race_condition.test
index 0f3b44864fe..79e1270b13c 100644
--- a/mysql-test/suite/rpl/t/kill_race_condition.test
+++ b/mysql-test/suite/rpl/t/kill_race_condition.test
@@ -7,6 +7,7 @@ create table t1 (a int);
 --sync_slave_with_master
 
 connection slave;
+set @saved_dbug = @@global.debug_dbug;
 set global debug_dbug='d,rows_log_event_before_open_table';
 
 connection master;
@@ -22,7 +23,7 @@ set debug_sync='now SIGNAL go_ahead_sql';
 --source include/wait_for_slave_sql_error.inc
 let $error= query_get_value(SHOW SLAVE STATUS, Last_SQL_Error, 1);
 --echo Last_SQL_Error = $error
-set global debug_dbug='';
+set @@global.debug_dbug = @saved_dbug;
 set debug_sync='RESET';
 connection master;
 drop table t1;
diff --git a/mysql-test/suite/rpl/t/rpl_bug33931.test b/mysql-test/suite/rpl/t/rpl_bug33931.test
index 2273219a821..c5e88fd68bf 100644
--- a/mysql-test/suite/rpl/t/rpl_bug33931.test
+++ b/mysql-test/suite/rpl/t/rpl_bug33931.test
@@ -15,6 +15,7 @@ call mtr.add_suppression("Slave SQL.*Failed during slave thread initialization.*
 reset slave;
 
 # Set debug flags on slave to force errors to occur
+set @saved_dbug = @@global.debug_dbug;
 SET GLOBAL debug_dbug="d,simulate_io_slave_error_on_init,simulate_sql_slave_error_on_init";
 
 --disable_query_log
@@ -39,7 +40,7 @@ start slave;
 #
 # Cleanup
 #
-SET GLOBAL debug_dbug="";
+set @@global.debug_dbug = @saved_dbug;
 
 # Clear Last_SQL_Error
 RESET SLAVE;
diff --git a/mysql-test/suite/rpl/t/rpl_bug41902.test b/mysql-test/suite/rpl/t/rpl_bug41902.test
index fe9452b0eda..21a556b9c8e 100644
--- a/mysql-test/suite/rpl/t/rpl_bug41902.test
+++ b/mysql-test/suite/rpl/t/rpl_bug41902.test
@@ -15,7 +15,7 @@ source include/master-slave.inc;
 
 connection slave;
 stop slave;
-
+set @saved_dbug = @@global.debug_dbug;
 SET @@debug_dbug="d,simulate_find_log_pos_error";
 
 --error ER_UNKNOWN_TARGET_BINLOG
@@ -36,6 +36,7 @@ reset slave;
 change master to master_host='dummy';
 
 connection master;
+set @saved_dbug_m = @@global.debug_dbug;
 SET @@debug_dbug="d,simulate_find_log_pos_error";
 --error ER_UNKNOWN_TARGET_BINLOG
 reset master;
@@ -53,10 +54,12 @@ purge binary logs to 'master-bin.000001';
 --disable_query_log
 call mtr.add_suppression("Failed to locate old binlog or relay log files");
 call mtr.add_suppression("MYSQL_BIN_LOG::purge_logs was called with file ..master-bin.000001 not listed in the index");
+set @@global.debug_dbug = @saved_dbug_m;
 connection slave;
 call mtr.add_suppression("Failed to locate old binlog or relay log files");
 call mtr.add_suppression("MYSQL_BIN_LOG::purge_logs was called with file ..master-bin.000001 not listed in the index");
 --enable_query_log
+set @@global.debug_dbug = @saved_dbug;
 
 --echo ==== clean up ====
 CHANGE MASTER TO MASTER_HOST = '127.0.0.1';
diff --git a/mysql-test/suite/rpl/t/rpl_get_master_version_and_clock.test b/mysql-test/suite/rpl/t/rpl_get_master_version_and_clock.test
index dca32c30a94..ac625e0b21a 100644
--- a/mysql-test/suite/rpl/t/rpl_get_master_version_and_clock.test
+++ b/mysql-test/suite/rpl/t/rpl_get_master_version_and_clock.test
@@ -26,7 +26,7 @@ call mtr.add_suppression("Fatal error: The slave I/O thread stops because master
 call mtr.add_suppression("Slave I/O thread .* register on master");
 
 #Test case 1: Try to get the value of the UNIX_TIMESTAMP from master under network disconnection
-let $debug_saved= `select @@global.debug`;
+set @saved_dbug = @@global.debug_dbug;
 
 # set up two parameters to pass into extra/rpl_tests/rpl_get_master_version_and_clock
 let $dbug_sync_point= 'debug_lock.before_get_UNIX_TIMESTAMP';
@@ -40,11 +40,9 @@ let $dbug_sync_point= 'debug_lock.before_get_SERVER_ID';
 let $debug_sync_action= 'now SIGNAL signal.get_server_id';
 source extra/rpl_tests/rpl_get_master_version_and_clock.test;
 
-eval set global debug_dbug= '$debug_saved';
-
 
 # cleanup
-
+set @@global.debug_dbug = @saved_dbug;
 # is not really necessary but avoids mtr post-run env check warnings
 SET DEBUG_SYNC= 'RESET';
 
diff --git a/mysql-test/suite/rpl/t/rpl_heartbeat_debug.test b/mysql-test/suite/rpl/t/rpl_heartbeat_debug.test
index 6a426ed1e9f..bd66a249ada 100644
--- a/mysql-test/suite/rpl/t/rpl_heartbeat_debug.test
+++ b/mysql-test/suite/rpl/t/rpl_heartbeat_debug.test
@@ -18,7 +18,7 @@ set @@global.slave_net_timeout= 10;
 # default period slave_net_timeout/2
 #
 --query_vertical show status like 'Slave_heartbeat_period';
-SET @save_dbug= @@GLOBAL.debug_dbug;
+SET @saved_dbug= @@GLOBAL.debug_dbug;
 SET GLOBAL debug_dbug="+d,simulate_slave_heartbeat_network_error";
 CALL mtr.add_suppression('SET @master_heartbeat_period to master failed with error');
 CALL mtr.add_suppression('Master command COM_REGISTER_SLAVE failed: failed registering on master, reconnecting to try again');
@@ -44,7 +44,7 @@ drop table t1;
 connection slave;
 --source include/stop_slave.inc
 --disable_warnings
-SET GLOBAL debug_dbug=@save_dbug;
+SET GLOBAL debug_dbug=@saved_dbug;
 set @@global.slave_net_timeout= @restore_slave_net_timeout;
 --enable_warnings
 --source include/start_slave.inc
diff --git a/mysql-test/suite/rpl/t/rpl_row_big_table_id.test b/mysql-test/suite/rpl/t/rpl_row_big_table_id.test
index 0c6f9d5e862..07e5aee4560 100644
--- a/mysql-test/suite/rpl/t/rpl_row_big_table_id.test
+++ b/mysql-test/suite/rpl/t/rpl_row_big_table_id.test
@@ -17,6 +17,7 @@
 --let $rpl_server_number= 1
 --source include/rpl_restart_server.inc
 
+set @saved_dbug = @@session.debug_dbug;
 SET @@debug_dbug="d,simulate_big_table_id";
 CREATE TABLE t (a int);
 
@@ -51,7 +52,7 @@ if (`SELECT sum(a) != 6 FROM t`)
 
 --connection master
 DROP TABLE t;
-
+set debug_dbug= @saved_dbug;
 --sync_slave_with_master
 
 --source include/rpl_end.inc
diff --git a/mysql-test/suite/rpl/t/rpl_row_find_row_debug.test b/mysql-test/suite/rpl/t/rpl_row_find_row_debug.test
index fb7491b0077..41a107e217d 100644
--- a/mysql-test/suite/rpl/t/rpl_row_find_row_debug.test
+++ b/mysql-test/suite/rpl/t/rpl_row_find_row_debug.test
@@ -9,7 +9,7 @@
 # - setup log_warnings and debug 
 --connection slave
 --source include/stop_slave.inc
---let $debug_save= `SELECT @@GLOBAL.debug_dbug`
+set @saved_dbug = @@global.debug_dbug;
 --let $log_warnings_save= `SELECT @@GLOBAL.log_warnings`
 
 SET GLOBAL log_warnings = 2;
@@ -55,7 +55,7 @@ EOF
 
 # cleanup
 --source include/stop_slave.inc
---eval SET GLOBAL debug_dbug = '$debug_save'
+set @@global.debug_dbug = @saved_dbug;
 --eval SET GLOBAL log_warnings = $log_warnings_save
 --source include/start_slave.inc
 
diff --git a/mysql-test/suite/rpl/t/rpl_row_index_choice.test b/mysql-test/suite/rpl/t/rpl_row_index_choice.test
index 0ad9b315d66..89b14add3b0 100644
--- a/mysql-test/suite/rpl/t/rpl_row_index_choice.test
+++ b/mysql-test/suite/rpl/t/rpl_row_index_choice.test
@@ -47,6 +47,7 @@ sync_slave_with_master;
 connection slave;
 ANALYZE TABLE t2;
 --echo # Slave will crash if using the wrong or no index
+set @saved_dbug = @@global.debug_dbug;
 SET GLOBAL debug_dbug="+d,slave_crash_if_wrong_index,slave_crash_if_table_scan";
 
 connection master;
@@ -238,6 +239,5 @@ connection master;
 DROP TABLE t1;
 sync_slave_with_master;
 connection slave;
-SET GLOBAL debug_dbug="";
-
+set @@global.debug_dbug = @saved_dbug;
 --source include/rpl_end.inc
diff --git a/mysql-test/suite/rpl/t/rpl_semi_sync_skip_repl.test b/mysql-test/suite/rpl/t/rpl_semi_sync_skip_repl.test
index 8c00bae06cd..2558792b438 100644
--- a/mysql-test/suite/rpl/t/rpl_semi_sync_skip_repl.test
+++ b/mysql-test/suite/rpl/t/rpl_semi_sync_skip_repl.test
@@ -33,7 +33,7 @@ source include/start_slave.inc;
 CREATE TABLE t1 (a INT) ENGINE=innodb;
 
 # Make the following events as if they offset over 2GB from the beginning of binlog
---let $sav_debug_dbug=@@GLOBAL.debug_dbug
+set @saved_dbug = @@global.debug_dbug;
 SET @@GLOBAL.debug_dbug="d,dbug_master_binlog_over_2GB";
 SET @@SESSION.skip_replication=1;
 INSERT INTO t1 SET a=1;
@@ -51,7 +51,7 @@ FLUSH LOGS;
 # Clean up
 #
 --connection master
---eval SET @@GLOBAL.debug_dbug=$sav_debug_dbug
+set @@global.debug_dbug = @saved_dbug;
 --eval SET @@GLOBAL.rpl_semi_sync_master_timeout = $sav_timeout_master
 --eval SET @@GLOBAL.rpl_semi_sync_master_enabled = $sav_enabled_master
 
diff --git a/mysql-test/suite/rpl/t/rpl_show_slave_running.test b/mysql-test/suite/rpl/t/rpl_show_slave_running.test
index 2cb44fc6ac1..33151bb87a4 100644
--- a/mysql-test/suite/rpl/t/rpl_show_slave_running.test
+++ b/mysql-test/suite/rpl/t/rpl_show_slave_running.test
@@ -11,7 +11,7 @@ connection slave;
 
 SET DEBUG_SYNC= 'RESET';
 source include/stop_slave.inc;
-let $debug_saved= `select @@global.debug`;
+set @saved_dbug = @@global.debug_dbug;
 set global debug_dbug= 'd,dbug.before_get_running_status_yes'; # to block due-started IO
 
 # Test 1. Slave is stopped
@@ -77,7 +77,7 @@ echo Slave_SQL_Running= $status;
 
 connection slave;
 
-eval set global debug_dbug= '$debug_saved';
+set @@global.debug_dbug = @saved_dbug;
 SET DEBUG_SYNC= 'RESET';
 --echo End of tests
 --source include/rpl_end.inc
diff --git a/mysql-test/suite/rpl/t/rpl_slave_load_remove_tmpfile.test b/mysql-test/suite/rpl/t/rpl_slave_load_remove_tmpfile.test
index 69319bad4a0..554ff564a0d 100644
--- a/mysql-test/suite/rpl/t/rpl_slave_load_remove_tmpfile.test
+++ b/mysql-test/suite/rpl/t/rpl_slave_load_remove_tmpfile.test
@@ -29,7 +29,7 @@
 ##########################################################################
 
 connection slave;
---let $old_debug= `SELECT @@global.debug_dbug`
+set @saved_dbug = @@global.debug_dbug;
 SET @@global.debug_dbug= '+d,remove_slave_load_file_before_write';
 
 connection master;
@@ -74,7 +74,7 @@ call mtr.add_suppression("Slave: File.* not found.*");
 call mtr.add_suppression("Slave SQL: Error .File.* not found.* error.* 29");
 --let $rpl_only_running_threads= 1
 
-eval SET @@global.debug_dbug= '$old_debug';
+set @@global.debug_dbug = @saved_dbug;
 
 --source include/rpl_end.inc
 
diff --git a/mysql-test/suite/rpl/t/rpl_stop_slave.test b/mysql-test/suite/rpl/t/rpl_stop_slave.test
index 5071fd348fb..c1130f1955e 100644
--- a/mysql-test/suite/rpl/t/rpl_stop_slave.test
+++ b/mysql-test/suite/rpl/t/rpl_stop_slave.test
@@ -22,7 +22,7 @@ source include/stop_slave.inc;
 --echo # Suspend the INSERT statement in current transaction on SQL thread.
 --echo # It guarantees that SQL thread is applying the transaction when
 --echo # STOP SLAVE command launchs.
-let $debug_save= `SELECT @@GLOBAL.debug`;
+set @saved_dbug = @@global.debug_dbug;
 SET GLOBAL debug_dbug= '+d,after_mysql_insert,*';
 source include/start_slave.inc;
 
@@ -44,9 +44,7 @@ source extra/rpl_tests/rpl_stop_slave.test;
 
 --echo
 --echo # Test end
---disable_query_log
-eval SET GLOBAL debug_dbug= '$debug_save';
---enable_query_log
+set @@global.debug_dbug = @saved_dbug;
 source include/restart_slave_sql.inc;
 
 connection slave;
@@ -79,7 +77,7 @@ connection master;
 # make sure that there are no zombie threads
 --source include/stop_dump_threads.inc
 
-let $debug_save= `SELECT @@GLOBAL.debug`;
+set @saved_dbug = @@global.debug_dbug;
 SET GLOBAL debug_dbug= '+d,dump_thread_wait_before_send_xid,*';
 
 connection slave;
@@ -126,9 +124,7 @@ reap;
 # sure that we disable the DBUG_EXECUTE_IF
 # that would set the dump thread to wait
 connection master;
---disable_query_log
-eval SET GLOBAL debug_dbug= '$debug_save';
---enable_query_log
+set @@global.debug_dbug = @saved_dbug;
 # make sure that there are no zombie threads
 --source include/stop_dump_threads.inc
 
diff --git a/mysql-test/suite/rpl/t/rpl_view_debug.test b/mysql-test/suite/rpl/t/rpl_view_debug.test
index a00b6733dea..ef59d25bf45 100644
--- a/mysql-test/suite/rpl/t/rpl_view_debug.test
+++ b/mysql-test/suite/rpl/t/rpl_view_debug.test
@@ -18,6 +18,7 @@ sync_slave_with_master;
 # view already has to be on slave
 show tables;
 connection master;
+set @saved_dbug = @@session.debug_dbug;
 set @@debug_dbug="d,simulate_register_view_failure";
 
 --error ER_OUT_OF_RESOURCES
@@ -30,5 +31,5 @@ show tables;
 connection master;
 DROP VIEW IF EXISTS v1;
 DROP TABLE t1;
-
+set debug_dbug= @saved_dbug;
 --source include/rpl_end.inc