Merge branch 'bb-10.3-release' into bb-10.4-releasemariadb-10.4.18

19 files changed, 36 insertions, 306 deletions

diff --git a/mysql-test/suite/galera/disabled.def b/mysql-test/suite/galera/disabled.def
index 0185871eaa4..efc8668b488 100644
--- a/mysql-test/suite/galera/disabled.def
+++ b/mysql-test/suite/galera/disabled.def
@@ -48,4 +48,6 @@ mysql-wsrep#198 : MDEV-24446: galera.mysql-wsrep#198 MTR failed: query 'reap' fa
 partition : MDEV-19958 Galera test failure on galera.partition
 query_cache: MDEV-15805 Test failure on galera.query_cache
 sql_log_bin : MDEV-21491 galera.sql_log_bin
-versioning_trx_id : MDEV-18590 galera.versioning_trx_id
+versioning_trx_id: MDEV-18590: galera.versioning_trx_id: Test failure: mysqltest: Result content mismatch
+galera_wsrep_provider_unset_set: wsrep_provider is read-only for security reasons
+pxc-421: wsrep_provider is read-only for security reasons
diff --git a/mysql-test/suite/galera/include/galera_load_provider.inc b/mysql-test/suite/galera/include/galera_load_provider.inc
index 0f843597d9c..b9b201106d7 100644
--- a/mysql-test/suite/galera/include/galera_load_provider.inc
+++ b/mysql-test/suite/galera/include/galera_load_provider.inc
@@ -1,8 +1,6 @@
 --echo Loading wsrep provider ...
 
 --disable_query_log
---eval SET GLOBAL wsrep_provider = '$wsrep_provider_orig';
-
 #
 # count occurences of successful node starts in error log
 #
diff --git a/mysql-test/suite/galera/include/galera_unload_provider.inc b/mysql-test/suite/galera/include/galera_unload_provider.inc
index cd841f51fbc..ed7e9bc41f0 100644
--- a/mysql-test/suite/galera/include/galera_unload_provider.inc
+++ b/mysql-test/suite/galera/include/galera_unload_provider.inc
@@ -1,7 +1,6 @@
 --echo Unloading wsrep provider ...
 
 --let $wsrep_cluster_address_orig = `SELECT @@wsrep_cluster_address`
---let $wsrep_provider_orig = `SELECT @@wsrep_provider`
 --let $wsrep_provider_options_orig = `SELECT @@wsrep_provider_options`
 --let $wsrep_error_log_orig = `SELECT @@log_error`
 if(!$wsrep_log_error_orig)
@@ -12,4 +11,4 @@ if(!$wsrep_log_error_orig)
 }
 --let LOG_FILE= $wsrep_log_error_orig
 
-SET GLOBAL wsrep_provider = 'none';
+SET GLOBAL wsrep_cluster_address = '';
diff --git a/mysql-test/suite/galera/r/galera_ist_mariabackup.result b/mysql-test/suite/galera/r/galera_ist_mariabackup.result
index 13f7d898a59..70a87c73df7 100644
--- a/mysql-test/suite/galera/r/galera_ist_mariabackup.result
+++ b/mysql-test/suite/galera/r/galera_ist_mariabackup.result
@@ -23,7 +23,7 @@ INSERT INTO t1 VALUES ('node2_committed_before');
 INSERT INTO t1 VALUES ('node2_committed_before');
 COMMIT;
 Unloading wsrep provider ...
-SET GLOBAL wsrep_provider = 'none';
+SET GLOBAL wsrep_cluster_address = '';
 connection node_1;
 SET AUTOCOMMIT=OFF;
 START TRANSACTION;
diff --git a/mysql-test/suite/galera/r/galera_ist_rsync.result b/mysql-test/suite/galera/r/galera_ist_rsync.result
index 13f7d898a59..70a87c73df7 100644
--- a/mysql-test/suite/galera/r/galera_ist_rsync.result
+++ b/mysql-test/suite/galera/r/galera_ist_rsync.result
@@ -23,7 +23,7 @@ INSERT INTO t1 VALUES ('node2_committed_before');
 INSERT INTO t1 VALUES ('node2_committed_before');
 COMMIT;
 Unloading wsrep provider ...
-SET GLOBAL wsrep_provider = 'none';
+SET GLOBAL wsrep_cluster_address = '';
 connection node_1;
 SET AUTOCOMMIT=OFF;
 START TRANSACTION;
diff --git a/mysql-test/suite/galera/r/galera_sst_mysqldump.result b/mysql-test/suite/galera/r/galera_sst_mysqldump.result
index 4ed679ba477..145b3a94775 100644
--- a/mysql-test/suite/galera/r/galera_sst_mysqldump.result
+++ b/mysql-test/suite/galera/r/galera_sst_mysqldump.result
@@ -30,7 +30,7 @@ INSERT INTO t1 VALUES ('node2_committed_before');
 INSERT INTO t1 VALUES ('node2_committed_before');
 COMMIT;
 Unloading wsrep provider ...
-SET GLOBAL wsrep_provider = 'none';
+SET GLOBAL wsrep_cluster_address = '';
 connection node_1;
 SET AUTOCOMMIT=OFF;
 START TRANSACTION;
diff --git a/mysql-test/suite/galera/r/mysql-wsrep#33.result b/mysql-test/suite/galera/r/mysql-wsrep#33.result
index fb0b593cc96..45c6a3f660a 100644
--- a/mysql-test/suite/galera/r/mysql-wsrep#33.result
+++ b/mysql-test/suite/galera/r/mysql-wsrep#33.result
@@ -32,7 +32,7 @@ INSERT INTO t1 VALUES ('node2_committed_before');
 INSERT INTO t1 VALUES ('node2_committed_before');
 COMMIT;
 Unloading wsrep provider ...
-SET GLOBAL wsrep_provider = 'none';
+SET GLOBAL wsrep_cluster_address = '';
 connection node_1;
 SET AUTOCOMMIT=OFF;
 START TRANSACTION;
diff --git a/mysql-test/suite/sys_vars/r/sysvars_wsrep.result b/mysql-test/suite/sys_vars/r/sysvars_wsrep.result
index 5ec5b9ccf30..4bff3d4441e 100644
--- a/mysql-test/suite/sys_vars/r/sysvars_wsrep.result
+++ b/mysql-test/suite/sys_vars/r/sysvars_wsrep.result
@@ -363,7 +363,7 @@ NUMERIC_MIN_VALUE	NULL
 NUMERIC_MAX_VALUE	NULL
 NUMERIC_BLOCK_SIZE	NULL
 ENUM_VALUE_LIST	NULL
-READ_ONLY	NO
+READ_ONLY	YES
 COMMAND_LINE_ARGUMENT	REQUIRED
 VARIABLE_NAME	WSREP_ON
 SESSION_VALUE	OFF
@@ -419,7 +419,7 @@ NUMERIC_MIN_VALUE	NULL
 NUMERIC_MAX_VALUE	NULL
 NUMERIC_BLOCK_SIZE	NULL
 ENUM_VALUE_LIST	NULL
-READ_ONLY	NO
+READ_ONLY	YES
 COMMAND_LINE_ARGUMENT	REQUIRED
 VARIABLE_NAME	WSREP_PROVIDER_OPTIONS
 SESSION_VALUE	NULL
diff --git a/mysql-test/suite/sys_vars/r/wsrep_notify_cmd_basic.result b/mysql-test/suite/sys_vars/r/wsrep_notify_cmd_basic.result
deleted file mode 100644
index 056ff8c817b..00000000000
--- a/mysql-test/suite/sys_vars/r/wsrep_notify_cmd_basic.result
+++ /dev/null
@@ -1,47 +0,0 @@
-#
-# wsrep_notify_cmd
-#
-call mtr.add_suppression("WSREP: Failed to get provider options");
-# save the initial value
-SET @wsrep_notify_cmd_global_saved = @@global.wsrep_notify_cmd;
-# default
-SELECT @@global.wsrep_notify_cmd;
-@@global.wsrep_notify_cmd
-
-
-# scope
-SELECT @@session.wsrep_notify_cmd;
-ERROR HY000: Variable 'wsrep_notify_cmd' is a GLOBAL variable
-SET @@global.wsrep_notify_cmd='notify_cmd';
-SELECT @@global.wsrep_notify_cmd;
-@@global.wsrep_notify_cmd
-notify_cmd
-
-# valid values
-SET @@global.wsrep_notify_cmd='command';
-SELECT @@global.wsrep_notify_cmd;
-@@global.wsrep_notify_cmd
-command
-SET @@global.wsrep_notify_cmd='hyphenated-command';
-SELECT @@global.wsrep_notify_cmd;
-@@global.wsrep_notify_cmd
-hyphenated-command
-SET @@global.wsrep_notify_cmd=default;
-SELECT @@global.wsrep_notify_cmd;
-@@global.wsrep_notify_cmd
-
-SET @@global.wsrep_notify_cmd=NULL;
-SELECT @@global.wsrep_notify_cmd;
-@@global.wsrep_notify_cmd
-NULL
-
-# invalid values
-SET @@global.wsrep_notify_cmd=1;
-ERROR 42000: Incorrect argument type to variable 'wsrep_notify_cmd'
-SELECT @@global.wsrep_notify_cmd;
-@@global.wsrep_notify_cmd
-NULL
-
-# restore the initial value
-SET @@global.wsrep_notify_cmd = @wsrep_notify_cmd_global_saved;
-# End of test
diff --git a/mysql-test/suite/sys_vars/r/wsrep_provider_basic.result b/mysql-test/suite/sys_vars/r/wsrep_provider_basic.result
deleted file mode 100644
index 3e4ac8ca883..00000000000
--- a/mysql-test/suite/sys_vars/r/wsrep_provider_basic.result
+++ /dev/null
@@ -1,40 +0,0 @@
-#
-# wsrep_provider
-#
-# save the initial value
-SET @wsrep_provider_global_saved = @@global.wsrep_provider;
-# default
-SELECT @@global.wsrep_provider;
-@@global.wsrep_provider
-none
-
-# scope
-SELECT @@session.wsrep_provider;
-ERROR HY000: Variable 'wsrep_provider' is a GLOBAL variable
-SELECT @@global.wsrep_provider;
-@@global.wsrep_provider
-none
-
-# valid values
-SET @@global.wsrep_provider=default;
-SELECT @@global.wsrep_provider;
-@@global.wsrep_provider
-none
-
-# invalid values
-SET @@global.wsrep_provider='/invalid/libgalera_smm.so';
-ERROR 42000: Variable 'wsrep_provider' can't be set to the value of '/invalid/libgalera_smm.so'
-SET @@global.wsrep_provider=NULL;
-ERROR 42000: Variable 'wsrep_provider' can't be set to the value of 'NULL'
-SELECT @@global.wsrep_provider;
-@@global.wsrep_provider
-none
-SET @@global.wsrep_provider=1;
-ERROR 42000: Incorrect argument type to variable 'wsrep_provider'
-SELECT @@global.wsrep_provider;
-@@global.wsrep_provider
-none
-
-# restore the initial value
-SET @@global.wsrep_provider = @wsrep_provider_global_saved;
-# End of test
diff --git a/mysql-test/suite/sys_vars/r/wsrep_provider_options_basic.result b/mysql-test/suite/sys_vars/r/wsrep_provider_options_basic.result
deleted file mode 100644
index 15949a14e39..00000000000
--- a/mysql-test/suite/sys_vars/r/wsrep_provider_options_basic.result
+++ /dev/null
@@ -1,46 +0,0 @@
-#
-# wsrep_provider_options
-#
-call mtr.add_suppression("WSREP: Failed to get provider options");
-# default
-SELECT @@global.wsrep_provider_options;
-@@global.wsrep_provider_options
-
-
-# scope
-SELECT @@session.wsrep_provider_options;
-ERROR HY000: Variable 'wsrep_provider_options' is a GLOBAL variable
-SET @@global.wsrep_provider_options='option1';
-SELECT @@global.wsrep_provider_options;
-@@global.wsrep_provider_options
-
-
-# valid values
-SET @@global.wsrep_provider_options='name1=value1;name2=value2';
-ERROR HY000: WSREP (galera) not started
-SELECT @@global.wsrep_provider_options;
-@@global.wsrep_provider_options
-
-SET @@global.wsrep_provider_options='hyphenated-name:value';
-ERROR HY000: WSREP (galera) not started
-SELECT @@global.wsrep_provider_options;
-@@global.wsrep_provider_options
-
-SET @@global.wsrep_provider_options=default;
-ERROR HY000: WSREP (galera) not started
-SELECT @@global.wsrep_provider_options;
-@@global.wsrep_provider_options
-
-
-# invalid values
-SET @@global.wsrep_provider_options=1;
-ERROR 42000: Incorrect argument type to variable 'wsrep_provider_options'
-SELECT @@global.wsrep_provider_options;
-@@global.wsrep_provider_options
-
-SET @@global.wsrep_provider_options=NULL;
-Got one of the listed errors
-SELECT @@global.wsrep_provider_options;
-@@global.wsrep_provider_options
-
-# End of test
diff --git a/mysql-test/suite/sys_vars/t/wsrep_notify_cmd_basic.test b/mysql-test/suite/sys_vars/t/wsrep_notify_cmd_basic.test
deleted file mode 100644
index 6d1535ba148..00000000000
--- a/mysql-test/suite/sys_vars/t/wsrep_notify_cmd_basic.test
+++ /dev/null
@@ -1,43 +0,0 @@
---source include/have_wsrep.inc
-
---echo #
---echo # wsrep_notify_cmd
---echo #
-
-call mtr.add_suppression("WSREP: Failed to get provider options");
-
---echo # save the initial value
-SET @wsrep_notify_cmd_global_saved = @@global.wsrep_notify_cmd;
-
---echo # default
-SELECT @@global.wsrep_notify_cmd;
-
---echo
---echo # scope
---error ER_INCORRECT_GLOBAL_LOCAL_VAR
-SELECT @@session.wsrep_notify_cmd;
-SET @@global.wsrep_notify_cmd='notify_cmd';
-SELECT @@global.wsrep_notify_cmd;
-
---echo
---echo # valid values
-SET @@global.wsrep_notify_cmd='command';
-SELECT @@global.wsrep_notify_cmd;
-SET @@global.wsrep_notify_cmd='hyphenated-command';
-SELECT @@global.wsrep_notify_cmd;
-SET @@global.wsrep_notify_cmd=default;
-SELECT @@global.wsrep_notify_cmd;
-SET @@global.wsrep_notify_cmd=NULL;
-SELECT @@global.wsrep_notify_cmd;
-
---echo
---echo # invalid values
---error ER_WRONG_TYPE_FOR_VAR
-SET @@global.wsrep_notify_cmd=1;
-SELECT @@global.wsrep_notify_cmd;
-
---echo
---echo # restore the initial value
-SET @@global.wsrep_notify_cmd = @wsrep_notify_cmd_global_saved;
-
---echo # End of test
diff --git a/mysql-test/suite/sys_vars/t/wsrep_provider_basic.test b/mysql-test/suite/sys_vars/t/wsrep_provider_basic.test
deleted file mode 100644
index 1190ab41bb0..00000000000
--- a/mysql-test/suite/sys_vars/t/wsrep_provider_basic.test
+++ /dev/null
@@ -1,39 +0,0 @@
---source include/have_wsrep.inc
-
---echo #
---echo # wsrep_provider
---echo #
-
---echo # save the initial value
-SET @wsrep_provider_global_saved = @@global.wsrep_provider;
-
---echo # default
-SELECT @@global.wsrep_provider;
-
---echo
---echo # scope
---error ER_INCORRECT_GLOBAL_LOCAL_VAR
-SELECT @@session.wsrep_provider;
-SELECT @@global.wsrep_provider;
-
---echo
---echo # valid values
-SET @@global.wsrep_provider=default;
-SELECT @@global.wsrep_provider;
-
---echo
---echo # invalid values
---error ER_WRONG_VALUE_FOR_VAR
-SET @@global.wsrep_provider='/invalid/libgalera_smm.so';
---error ER_WRONG_VALUE_FOR_VAR
-SET @@global.wsrep_provider=NULL;
-SELECT @@global.wsrep_provider;
---error ER_WRONG_TYPE_FOR_VAR
-SET @@global.wsrep_provider=1;
-SELECT @@global.wsrep_provider;
-
---echo
---echo # restore the initial value
-SET @@global.wsrep_provider = @wsrep_provider_global_saved;
-
---echo # End of test
diff --git a/mysql-test/suite/sys_vars/t/wsrep_provider_options_basic.test b/mysql-test/suite/sys_vars/t/wsrep_provider_options_basic.test
deleted file mode 100644
index 6eb3a94b6a4..00000000000
--- a/mysql-test/suite/sys_vars/t/wsrep_provider_options_basic.test
+++ /dev/null
@@ -1,41 +0,0 @@
---source include/have_wsrep.inc
-
---echo #
---echo # wsrep_provider_options
---echo #
-
-call mtr.add_suppression("WSREP: Failed to get provider options");
-
---echo # default
-SELECT @@global.wsrep_provider_options;
-
---echo
---echo # scope
---error ER_INCORRECT_GLOBAL_LOCAL_VAR
-SELECT @@session.wsrep_provider_options;
---error 0,ER_WRONG_ARGUMENTS
-SET @@global.wsrep_provider_options='option1';
-SELECT @@global.wsrep_provider_options;
-
---echo
---echo # valid values
---error ER_WRONG_ARGUMENTS
-SET @@global.wsrep_provider_options='name1=value1;name2=value2';
-SELECT @@global.wsrep_provider_options;
---error ER_WRONG_ARGUMENTS
-SET @@global.wsrep_provider_options='hyphenated-name:value';
-SELECT @@global.wsrep_provider_options;
---error ER_WRONG_ARGUMENTS
-SET @@global.wsrep_provider_options=default;
-SELECT @@global.wsrep_provider_options;
-
---echo
---echo # invalid values
---error ER_WRONG_TYPE_FOR_VAR
-SET @@global.wsrep_provider_options=1;
-SELECT @@global.wsrep_provider_options;
---error ER_WRONG_ARGUMENTS,ER_WRONG_ARGUMENTS
-SET @@global.wsrep_provider_options=NULL;
-SELECT @@global.wsrep_provider_options;
-
---echo # End of test
diff --git a/mysql-test/suite/wsrep/disabled.def b/mysql-test/suite/wsrep/disabled.def
index 11577bfe8b0..a1c8165d165 100644
--- a/mysql-test/suite/wsrep/disabled.def
+++ b/mysql-test/suite/wsrep/disabled.def
@@ -10,3 +10,7 @@
 #
 ##############################################################################
 
+
+mdev_6832: wsrep_provider is read-only for security reasons
+MDEV-23092: wsrep_provider is read-only for security reasons
+wsrep_variables_no_provider: wsrep_provider is read-only for security reasons
diff --git a/mysql-test/suite/wsrep/r/variables.result b/mysql-test/suite/wsrep/r/variables.result
index 9ef1b3290af..8bb0b426380 100644
--- a/mysql-test/suite/wsrep/r/variables.result
+++ b/mysql-test/suite/wsrep/r/variables.result
@@ -14,7 +14,6 @@ SET SESSION wsrep_replicate_myisam= ON;
 ERROR HY000: Variable 'wsrep_replicate_myisam' is a GLOBAL variable and should be set with SET GLOBAL
 SET GLOBAL wsrep_replicate_myisam= ON;
 SET GLOBAL wsrep_replicate_myisam= OFF;
-SET GLOBAL wsrep_provider=none;
 #
 # MDEV#5790: SHOW GLOBAL STATUS LIKE does not show the correct list of
 # variables when using "_"
@@ -26,7 +25,6 @@ wsrep_local_state_comment	#
 # Should show nothing.
 SHOW STATUS LIKE 'x';
 Variable_name	Value
-SET GLOBAL wsrep_provider=none;
 
 SHOW STATUS LIKE 'wsrep_local_state_uuid';
 Variable_name	Value
@@ -35,7 +33,6 @@ wsrep_local_state_uuid	#
 SHOW STATUS LIKE 'wsrep_last_committed';
 Variable_name	Value
 wsrep_last_committed	#
-SET GLOBAL wsrep_provider=none;
 
 #
 # MDEV#6206: wsrep_slave_threads subtracts from max_connections
@@ -49,7 +46,7 @@ SELECT @@global.wsrep_slave_threads;
 1
 SELECT @@global.wsrep_cluster_address;
 @@global.wsrep_cluster_address
-
+gcomm://
 SELECT @@global.wsrep_on;
 @@global.wsrep_on
 1
@@ -58,14 +55,14 @@ Variable_name	Value
 Threads_connected	1
 SHOW STATUS LIKE 'wsrep_thread_count';
 Variable_name	Value
-wsrep_thread_count	0
+wsrep_thread_count	2
 
 SELECT @@global.wsrep_provider;
 @@global.wsrep_provider
 libgalera_smm.so
 SELECT @@global.wsrep_cluster_address;
 @@global.wsrep_cluster_address
-
+gcomm://
 SELECT @@global.wsrep_on;
 @@global.wsrep_on
 1
@@ -74,11 +71,10 @@ Variable_name	Value
 Threads_connected	1
 SHOW STATUS LIKE 'wsrep_thread_count';
 Variable_name	Value
-wsrep_thread_count	0
+wsrep_thread_count	2
 
 # Setting wsrep_cluster_address triggers the creation of
 # applier/rollbacker threads.
-SET GLOBAL wsrep_cluster_address= 'gcomm://';
 # Wait for applier thread to get created 1.
 # Wait for applier thread to get created 2.
 SELECT VARIABLE_VALUE AS EXPECT_1 FROM INFORMATION_SCHEMA.GLOBAL_STATUS WHERE VARIABLE_NAME = 'wsrep_applier_thread_count';
diff --git a/mysql-test/suite/wsrep/t/variables.test b/mysql-test/suite/wsrep/t/variables.test
index cae2fe5d6db..6dc63db12aa 100644
--- a/mysql-test/suite/wsrep/t/variables.test
+++ b/mysql-test/suite/wsrep/t/variables.test
@@ -22,7 +22,7 @@ SET GLOBAL wsrep_replicate_myisam= ON;
 
 # Reset it back.
 SET GLOBAL wsrep_replicate_myisam= OFF;
-SET GLOBAL wsrep_provider=none;
+#SET GLOBAL wsrep_provider=none;
 
 --echo #
 --echo # MDEV#5790: SHOW GLOBAL STATUS LIKE does not show the correct list of
@@ -31,9 +31,7 @@ SET GLOBAL wsrep_provider=none;
 
 CALL mtr.add_suppression("WSREP: Could not open saved state file for reading.*");
 
---disable_query_log
-eval SET GLOBAL wsrep_provider= '$WSREP_PROVIDER';
---enable_query_log
+#evalp SET GLOBAL wsrep_provider= '$WSREP_PROVIDER';
 
 --replace_column 2 #
 SHOW GLOBAL STATUS LIKE 'wsrep_local_state_comment';
@@ -42,11 +40,9 @@ SHOW GLOBAL STATUS LIKE 'wsrep_local_state_comment';
 SHOW STATUS LIKE 'x';
 
 # Reset it back.
-SET GLOBAL wsrep_provider=none;
+#SET GLOBAL wsrep_provider=none;
 
---disable_query_log
-eval SET GLOBAL wsrep_provider= '$WSREP_PROVIDER';
---enable_query_log
+#evalp SET GLOBAL wsrep_provider= '$WSREP_PROVIDER';
 
 # The following 2 variables are used by mariabackup
 # SST.
@@ -58,7 +54,7 @@ SHOW STATUS LIKE 'wsrep_local_state_uuid';
 SHOW STATUS LIKE 'wsrep_last_committed';
 
 # Reset it back.
-SET GLOBAL wsrep_provider=none;
+#SET GLOBAL wsrep_provider=none;
 
 --echo
 --echo #
@@ -66,9 +62,7 @@ SET GLOBAL wsrep_provider=none;
 --echo #
 call mtr.add_suppression("WSREP: Failed to get provider options");
 
---disable_query_log
-eval SET GLOBAL wsrep_provider= '$WSREP_PROVIDER';
---enable_query_log
+#evalp SET GLOBAL wsrep_provider= '$WSREP_PROVIDER';
 
 --replace_regex /.*libgalera.*smm.*/libgalera_smm.so/
 SELECT @@global.wsrep_provider;
@@ -79,9 +73,7 @@ SHOW STATUS LIKE 'threads_connected';
 SHOW STATUS LIKE 'wsrep_thread_count';
 --echo
 
---disable_query_log
-eval SET GLOBAL wsrep_provider= '$WSREP_PROVIDER';
---enable_query_log
+#evalp SET GLOBAL wsrep_provider= '$WSREP_PROVIDER';
 
 --replace_regex /.*libgalera.*smm.*/libgalera_smm.so/
 SELECT @@global.wsrep_provider;
@@ -93,7 +85,7 @@ SHOW STATUS LIKE 'wsrep_thread_count';
 
 --echo # Setting wsrep_cluster_address triggers the creation of
 --echo # applier/rollbacker threads.
-SET GLOBAL wsrep_cluster_address= 'gcomm://';
+#SET GLOBAL wsrep_cluster_address= 'gcomm://';
 
 --echo # Wait for applier thread to get created 1.
 --let $wait_condition = SELECT VARIABLE_VALUE = 1 FROM INFORMATION_SCHEMA.GLOBAL_STATUS WHERE VARIABLE_NAME = 'wsrep_applier_thread_count';
@@ -154,15 +146,6 @@ SET @@global.wsrep_sst_auth= NULL;
 SELECT @@global.wsrep_sst_auth;
 SET @@global.wsrep_sst_auth= @wsrep_sst_auth_saved;
 
-# Reset (for mtr internal checks)
-
---disable_query_log
-SET GLOBAL wsrep_slave_threads= @wsrep_slave_threads_saved;
-eval SET GLOBAL wsrep_provider= '$WSREP_PROVIDER';
-SET GLOBAL wsrep_cluster_address= @wsrep_cluster_address_saved;
-SET GLOBAL wsrep_provider_options= @wsrep_provider_options_saved;
---enable_query_log
-
 --source include/galera_wait_ready.inc
 
 --echo # End of test.
diff --git a/sql/sys_vars.cc b/sql/sys_vars.cc
index 87ab62c4261..a39928309d8 100644
--- a/sql/sys_vars.cc
+++ b/sql/sys_vars.cc
@@ -5418,7 +5418,7 @@ static Sys_var_tz Sys_time_zone(
 
 static Sys_var_charptr Sys_wsrep_provider(
        "wsrep_provider", "Path to replication provider library",
-       PREALLOCATED GLOBAL_VAR(wsrep_provider), CMD_LINE(REQUIRED_ARG),
+       PREALLOCATED READ_ONLY GLOBAL_VAR(wsrep_provider), CMD_LINE(REQUIRED_ARG),
        IN_FS_CHARSET, DEFAULT(WSREP_NONE),
        NO_MUTEX_GUARD, NOT_IN_BINLOG,
        ON_CHECK(wsrep_provider_check), ON_UPDATE(wsrep_provider_update));
@@ -5634,7 +5634,7 @@ static Sys_var_ulong Sys_wsrep_max_ws_rows (
 
 static Sys_var_charptr Sys_wsrep_notify_cmd(
        "wsrep_notify_cmd", "",
-       GLOBAL_VAR(wsrep_notify_cmd),CMD_LINE(REQUIRED_ARG),
+       READ_ONLY GLOBAL_VAR(wsrep_notify_cmd), CMD_LINE(REQUIRED_ARG),
        IN_SYSTEM_CHARSET, DEFAULT(""));
 
 static Sys_var_mybool Sys_wsrep_certify_nonPK(
diff --git a/sql/wsrep_notify.cc b/sql/wsrep_notify.cc
index 1d6d13ea6d2..d2d08e92ae7 100644
--- a/sql/wsrep_notify.cc
+++ b/sql/wsrep_notify.cc
@@ -27,10 +27,12 @@ void wsrep_notify_status(enum wsrep::server_state::state status,
     return;
   }
 
-  char  cmd_buf[1 << 16]; // this can be long
-  long  cmd_len= sizeof(cmd_buf) - 1;
-  char* cmd_ptr= cmd_buf;
-  long  cmd_off= 0;
+  const long  cmd_len = (1 << 16) - 1;
+  char* cmd_ptr = (char*) my_malloc(cmd_len + 1, MYF(MY_WME));
+  long  cmd_off = 0;
+
+  if (!cmd_ptr)
+    return; // the warning is in the log
 
   cmd_off += snprintf (cmd_ptr + cmd_off, cmd_len - cmd_off, "%s",
                        wsrep_notify_cmd);
@@ -73,6 +75,7 @@ void wsrep_notify_status(enum wsrep::server_state::state status,
   {
     WSREP_ERROR("Notification buffer too short (%ld). Aborting notification.",
                cmd_len);
+    my_free(cmd_ptr);
     return;
   }
 
@@ -86,5 +89,6 @@ void wsrep_notify_status(enum wsrep::server_state::state status,
     WSREP_ERROR("Notification command failed: %d (%s): \"%s\"",
                 err, strerror(err), cmd_ptr);
   }
+  my_free(cmd_ptr);
 }