diff --git a/config/ac-macros/character_sets.m4 b/config/ac-macros/character_sets.m4
index a9f7bd73858..24bdd92b083 100644
--- a/config/ac-macros/character_sets.m4
+++ b/config/ac-macros/character_sets.m4
@@ -5,6 +5,9 @@ dnl you must also create strings/ctype-$charset_name.c
 
 AC_DIVERT_PUSH(0)
 
+# Any changes to the available character sets must also go into
+# include/config-win.h
+
 define(CHARSETS_AVAILABLE0,binary)
 define(CHARSETS_AVAILABLE1,armscii8 ascii big5 cp1250 cp1251 cp1256 cp1257)
 define(CHARSETS_AVAILABLE2,cp850 cp852 cp866 cp932 dec8 eucjpms euckr gb2312 gbk geostd8)
diff --git a/include/config-win.h b/include/config-win.h
index c8b9004eb8a..ab0926af864 100644
--- a/include/config-win.h
+++ b/include/config-win.h
@@ -197,11 +197,6 @@ typedef uint rf_SetTimer;
 #define SIGNAL_WITH_VIO_CLOSE
 #endif
 
-/* Use all character sets in MySQL */
-#define USE_MB 1
-#define USE_MB_IDENT 1
-#define USE_STRCOLL 1
-
 /* All windows servers should support .sym files */
 #undef USE_SYMDIR
 #define USE_SYMDIR
@@ -371,9 +366,6 @@ inline ulonglong double2ulonglong(double d)
 #define shared_memory_buffer_length 16000
 #define default_shared_memory_base_name "MYSQL"
 
-#define MYSQL_DEFAULT_CHARSET_NAME "latin1"
-#define MYSQL_DEFAULT_COLLATION_NAME "latin1_swedish_ci"
-
 #define HAVE_SPATIAL 1
 #define HAVE_RTREE_KEYS 1
 
@@ -383,40 +375,54 @@ inline ulonglong double2ulonglong(double d)
 #define COMMUNITY_SERVER 1
 #define ENABLED_PROFILING 1
 
-/* Define charsets you want */
-/* #undef HAVE_CHARSET_armscii8 */
-/* #undef HAVE_CHARSET_ascii */
+/*
+  Our Windows binaries include all character sets which MySQL supports.
+  Any changes to the available character sets must also go into
+  config/ac-macros/character_sets.m4
+*/
+
+#define MYSQL_DEFAULT_CHARSET_NAME "latin1"
+#define MYSQL_DEFAULT_COLLATION_NAME "latin1_swedish_ci"
+
+#define USE_MB 1
+#define USE_MB_IDENT 1
+#define USE_STRCOLL 1
+
+#define HAVE_CHARSET_armscii8
+#define HAVE_CHARSET_ascii
 #define HAVE_CHARSET_big5 1
 #define HAVE_CHARSET_cp1250 1
-/* #undef HAVE_CHARSET_cp1251 */
-/* #undef HAVE_CHARSET_cp1256 */
-/* #undef HAVE_CHARSET_cp1257 */
-/* #undef HAVE_CHARSET_cp850 */
-/* #undef HAVE_CHARSET_cp852 */
-/* #undef HAVE_CHARSET_cp866 */
+#define HAVE_CHARSET_cp1251
+#define HAVE_CHARSET_cp1256
+#define HAVE_CHARSET_cp1257
+#define HAVE_CHARSET_cp850
+#define HAVE_CHARSET_cp852
+#define HAVE_CHARSET_cp866
 #define HAVE_CHARSET_cp932 1
-/* #undef HAVE_CHARSET_dec8 */
+#define HAVE_CHARSET_dec8
 #define HAVE_CHARSET_eucjpms 1
 #define HAVE_CHARSET_euckr 1
 #define HAVE_CHARSET_gb2312 1
 #define HAVE_CHARSET_gbk 1
-/* #undef HAVE_CHARSET_greek */
-/* #undef HAVE_CHARSET_hebrew */
-/* #undef HAVE_CHARSET_hp8 */
-/* #undef HAVE_CHARSET_keybcs2 */
-/* #undef HAVE_CHARSET_koi8r */
-/* #undef HAVE_CHARSET_koi8u */
+#define HAVE_CHARSET_geostd8
+#define HAVE_CHARSET_greek
+#define HAVE_CHARSET_hebrew
+#define HAVE_CHARSET_hp8
+#define HAVE_CHARSET_keybcs2
+#define HAVE_CHARSET_koi8r
+#define HAVE_CHARSET_koi8u
 #define HAVE_CHARSET_latin1 1
 #define HAVE_CHARSET_latin2 1
-/* #undef HAVE_CHARSET_latin5 */
-/* #undef HAVE_CHARSET_latin7 */
-/* #undef HAVE_CHARSET_macce */
-/* #undef HAVE_CHARSET_macroman */
+#define HAVE_CHARSET_latin5
+#define HAVE_CHARSET_latin7
+#define HAVE_CHARSET_macce
+#define HAVE_CHARSET_macroman
 #define HAVE_CHARSET_sjis 1
-/* #undef HAVE_CHARSET_swe7 */
+#define HAVE_CHARSET_swe7
 #define HAVE_CHARSET_tis620 1
 #define HAVE_CHARSET_ucs2 1
 #define HAVE_CHARSET_ujis 1
 #define HAVE_CHARSET_utf8 1
+
 #define HAVE_UCA_COLLATIONS 1
 #define HAVE_BOOL 1
diff --git a/mysql-test/include/rpl_events.inc b/mysql-test/include/rpl_events.inc
index 34ceba81a38..0effa8c4e5c 100644
--- a/mysql-test/include/rpl_events.inc
+++ b/mysql-test/include/rpl_events.inc
@@ -62,7 +62,9 @@ SELECT db, name, status, originator FROM mysql.event WHERE db = 'test' AND name
 DROP EVENT IF EXISTS test.slave_once;
 --enable_warnings
 
-CREATE EVENT test.slave_once ON SCHEDULE EVERY 5 MINUTE DO 
+# Create an event on slave and check its state. An event shouldn't be executed 
+# so set start time in 1 hour.
+CREATE EVENT test.slave_once ON SCHEDULE EVERY 5 MINUTE STARTS CURRENT_TIMESTAMP + INTERVAL 1 HOUR DO 
   INSERT IGNORE INTO t1(id, c) VALUES (3, 'from slave_once');
 
 --echo "Checking event status on the slave for originator value = slave's server_id"
@@ -81,8 +83,11 @@ connection master;
 DROP EVENT IF EXISTS test.justonce;
 --enable_warnings
 
+# Create an event on master and check its state on slave. An event shouldn't be executed 
+# so set start time in 1 hour. Check that changes of event statement replicated to slave
+
 --echo "Creating event test.er on the master"
-CREATE EVENT test.er ON SCHEDULE EVERY 3 SECOND DO 
+CREATE EVENT test.er ON SCHEDULE EVERY 3 SECOND STARTS CURRENT_TIMESTAMP + INTERVAL 1 HOUR DO 
   INSERT IGNORE INTO t1(id, c) VALUES (4, 'from er');
 
 --echo "Checking event status on the master"
@@ -95,7 +100,7 @@ SELECT db, name, status, originator, body FROM mysql.event WHERE db = 'test' AND
 
 connection master;
 --echo "Altering event test.er on the master"
-ALTER EVENT test.er ON SCHEDULE EVERY 5 SECOND DO 
+ALTER EVENT test.er ON SCHEDULE EVERY 5 SECOND STARTS CURRENT_TIMESTAMP + INTERVAL 1 HOUR DO 
   INSERT IGNORE INTO t1(id, c) VALUES (5, 'from alter er');
 
 --echo "Checking event status on the master"
@@ -123,8 +128,11 @@ SELECT db, name, status, originator FROM mysql.event WHERE db = 'test';
 # test the DISABLE ON SLAVE for setting event SLAVESIDE_DISABLED as status
 # on CREATE EVENT
 
+# Create an event on slave and check its status. An event shouldn't be executed 
+# so set start time in 1 hour.
+
 --echo "Creating event test.slave_terminate on the slave"
-CREATE EVENT test.slave_terminate ON SCHEDULE EVERY 3 SECOND DO 
+CREATE EVENT test.slave_terminate ON SCHEDULE EVERY 3 SECOND STARTS CURRENT_TIMESTAMP + INTERVAL 1 HOUR DO 
   INSERT IGNORE INTO t1(id, c) VALUES (6, 'from slave_terminate');
 
 --echo "Checking event status on the slave"
diff --git a/mysql-test/r/character_set_database_func.result b/mysql-test/r/character_set_database_func.result
index 95b65eacfd2..60628c30187 100644
--- a/mysql-test/r/character_set_database_func.result
+++ b/mysql-test/r/character_set_database_func.result
@@ -2,6 +2,7 @@
 SET @global_character_set_database = @@global.character_set_database;
 SET @session_character_set_database = @@session.character_set_database;
 SET @session_character_set_server = @@session.character_set_server;
+SET @global_character_set_server = @@global.character_set_server;
 SET @@global.character_set_database = utf8;
 'connect (con1,localhost,root,,,,)'
 'connection con1'
@@ -71,6 +72,15 @@ SELECT count(*) FROM t1 WHERE CHAR_LENGTH(a)>1;
 count(*)
 1
 DROP TABLE IF EXISTS t1;
+'Bug#27208: If no current database, character_set_database !=character_set_server'
+SET GLOBAL character_set_server=latin5;
+CREATE DATABASE csdb CHARACTER SET = utf8;
+USE csdb;
+DROP DATABASE csdb;
+SELECT @@character_set_database;
+@@character_set_database
+latin5
 SET @@global.character_set_database = @global_character_set_database;
 SET @@session.character_set_database = @session_character_set_database;
 SET @@session.character_set_server = @session_character_set_server;
+SET @@global.character_set_server = @global_character_set_server;
diff --git a/mysql-test/r/date_formats.result b/mysql-test/r/date_formats.result
index 99ae6d85fee..7e185daa668 100644
--- a/mysql-test/r/date_formats.result
+++ b/mysql-test/r/date_formats.result
@@ -1,14 +1,20 @@
 drop table if exists t1;
-SHOW GLOBAL VARIABLES LIKE "%e_format";
-Variable_name	Value
-date_format	%d.%m.%Y
-datetime_format	%Y-%m-%d %H:%i:%s
-time_format	%H.%i.%s
-SHOW SESSION VARIABLES LIKE "%e_format";
-Variable_name	Value
-date_format	%d.%m.%Y
-datetime_format	%Y-%m-%d %H:%i:%s
-time_format	%H.%i.%s
+SELECT variable_name, variable_value
+FROM information_schema.global_variables
+WHERE variable_name IN ('date_format', 'datetime_format', 'time_format')
+ORDER BY variable_name;
+variable_name	variable_value
+DATETIME_FORMAT	%Y-%m-%d %H:%i:%s
+DATE_FORMAT	%d.%m.%Y
+TIME_FORMAT	%H.%i.%s
+SELECT variable_name, variable_value
+FROM information_schema.session_variables
+WHERE variable_name IN ('date_format', 'datetime_format', 'time_format')
+ORDER BY variable_name;
+variable_name	variable_value
+DATETIME_FORMAT	%Y-%m-%d %H:%i:%s
+DATE_FORMAT	%d.%m.%Y
+TIME_FORMAT	%H.%i.%s
 SET time_format='%H%i%s';
 SET time_format='%H:%i:%s.%f';
 SET time_format='%h-%i-%s.%f%p';
@@ -26,11 +32,14 @@ set datetime_format= '%H:%i:%s %Y-%m-%d';
 set datetime_format= '%H:%i:%s.%f %m-%d-%Y';
 set datetime_format= '%h:%i:%s %p %Y-%m-%d';
 set datetime_format= '%h:%i:%s.%f %p %Y-%m-%d';
-SHOW SESSION VARIABLES LIKE "%e_format";
-Variable_name	Value
-date_format	%m-%d-%Y
-datetime_format	%h:%i:%s.%f %p %Y-%m-%d
-time_format	%h:%i:%s%p
+SELECT variable_name, variable_value
+FROM information_schema.session_variables
+WHERE variable_name IN ('date_format', 'datetime_format', 'time_format')
+ORDER BY variable_name;
+variable_name	variable_value
+DATETIME_FORMAT	%h:%i:%s.%f %p %Y-%m-%d
+DATE_FORMAT	%m-%d-%Y
+TIME_FORMAT	%h:%i:%s%p
 SET time_format='%h:%i:%s';
 ERROR 42000: Variable 'time_format' can't be set to the value of '%h:%i:%s'
 SET time_format='%H %i:%s';
diff --git a/mysql-test/r/having.result b/mysql-test/r/having.result
index a5a96fd4958..9c3cc8fc89e 100644
--- a/mysql-test/r/having.result
+++ b/mysql-test/r/having.result
@@ -424,3 +424,10 @@ select f1 from t1 group by f1 having max(f1)=f1;
 f1
 set session sql_mode='';
 drop table t1;
+CREATE TABLE t1 ( a INT, b INT);
+INSERT INTO t1 VALUES (1, 1), (2,2), (3, NULL);
+SELECT b, COUNT(DISTINCT a) FROM t1 GROUP BY b HAVING b is NULL;
+b	COUNT(DISTINCT a)
+NULL	1
+DROP TABLE t1;
+End of 5.0 tests
diff --git a/mysql-test/r/innodb-semi-consistent.result b/mysql-test/r/innodb-semi-consistent.result
index 6173048c320..55e3cb5c7b4 100644
--- a/mysql-test/r/innodb-semi-consistent.result
+++ b/mysql-test/r/innodb-semi-consistent.result
@@ -1,6 +1,6 @@
 drop table if exists t1;
 set binlog_format=mixed;
-set session transaction isolation level read committed;
+set session transaction isolation level repeatable read;
 create table t1(a int not null) engine=innodb DEFAULT CHARSET=latin1;
 insert into t1 values (1),(2),(3),(4),(5),(6),(7);
 set autocommit=0;
@@ -8,11 +8,12 @@ select * from t1 where a=3 lock in share mode;
 a
 3
 set binlog_format=mixed;
-set session transaction isolation level read committed;
+set session transaction isolation level repeatable read;
 set autocommit=0;
 update t1 set a=10 where a=5;
 ERROR HY000: Lock wait timeout exceeded; try restarting transaction
 commit;
+set session transaction isolation level read committed;
 update t1 set a=10 where a=5;
 select * from t1 where a=2 for update;
 ERROR HY000: Lock wait timeout exceeded; try restarting transaction
diff --git a/mysql-test/r/myisampack.result b/mysql-test/r/myisampack.result
index 7ed9b86d887..50d700ab7a2 100644
--- a/mysql-test/r/myisampack.result
+++ b/mysql-test/r/myisampack.result
@@ -48,4 +48,9 @@ Table	Op	Msg_type	Msg_text
 test.t1	optimize	error	Table 'test.t1' is read only
 Warnings:
 Error	1036	Table 't1' is read only
+repair table t1;
+Table	Op	Msg_type	Msg_text
+test.t1	repair	error	Table 'test.t1' is read only
+Warnings:
+Error	1036	Table 't1' is read only
 drop table t1;
diff --git a/mysql-test/r/partition_innodb_semi_consistent.result b/mysql-test/r/partition_innodb_semi_consistent.result
index 1bb39af043a..471da4c1c2e 100644
--- a/mysql-test/r/partition_innodb_semi_consistent.result
+++ b/mysql-test/r/partition_innodb_semi_consistent.result
@@ -1,6 +1,6 @@
 drop table if exists t1;
 set binlog_format=mixed;
-set session transaction isolation level read committed;
+set session transaction isolation level repeatable read;
 create table t1(a int not null)
 engine=innodb
 DEFAULT CHARSET=latin1
@@ -13,11 +13,12 @@ select * from t1 where a=3 lock in share mode;
 a
 3
 set binlog_format=mixed;
-set session transaction isolation level read committed;
+set session transaction isolation level repeatable read;
 set autocommit=0;
 update t1 set a=10 where a=5;
 ERROR HY000: Lock wait timeout exceeded; try restarting transaction
 commit;
+set session transaction isolation level read committed;
 update t1 set a=10 where a=5;
 select * from t1 where a=2 for update;
 ERROR HY000: Lock wait timeout exceeded; try restarting transaction
diff --git a/mysql-test/r/query_cache_notembedded.result b/mysql-test/r/query_cache_notembedded.result
index ec78c2267d2..b236320a6dd 100644
--- a/mysql-test/r/query_cache_notembedded.result
+++ b/mysql-test/r/query_cache_notembedded.result
@@ -346,6 +346,22 @@ id
 drop table t1;
 drop function f1;
 set GLOBAL query_cache_size=0;
+DROP TABLE IF EXISTS t1;
+FLUSH STATUS;
+SET GLOBAL query_cache_size=1048576;
+CREATE TABLE t1 (a INT);
+INSERT INTO t1 VALUES (1),(2),(3),(4),(5);
+SHOW STATUS LIKE 'Qcache_queries_in_cache';
+Variable_name	Value
+Qcache_queries_in_cache	0
+LOCK TABLES t1 WRITE;
+SELECT * FROM t1;
+UNLOCK TABLES;
+SHOW STATUS LIKE 'Qcache_queries_in_cache';
+Variable_name	Value
+Qcache_queries_in_cache	0
+DROP TABLE t1;
+SET GLOBAL query_cache_size= default;
 SET GLOBAL log_bin_trust_function_creators = 0;
 DROP DATABASE IF EXISTS bug30269;
 FLUSH STATUS;
diff --git a/mysql-test/suite/rpl/r/rpl_cross_version.result b/mysql-test/suite/rpl/r/rpl_cross_version.result
new file mode 100644
index 00000000000..de5dd134516
--- /dev/null
+++ b/mysql-test/suite/rpl/r/rpl_cross_version.result
@@ -0,0 +1,12 @@
+==== Initialize ====
+Setting up fake replication from MYSQL_TEST_DIR/suite/binlog/std_data/binlog_old_version_4_1.000001
+==== Test ====
+start slave sql_thread;
+==== a prove that the fake has been processed successfully ====
+SELECT COUNT(*) - 17920 as zero FROM t3;
+zero
+0
+==== Clean up ====
+stop slave sql_thread;
+Cleaning up after setup_fake_relay_log.inc
+drop table t1, t3;
diff --git a/mysql-test/suite/rpl/r/rpl_events.result b/mysql-test/suite/rpl/r/rpl_events.result
index e4a412cb1d5..b797183f9d2 100644
--- a/mysql-test/suite/rpl/r/rpl_events.result
+++ b/mysql-test/suite/rpl/r/rpl_events.result
@@ -1,10 +1,11 @@
-set global event_scheduler=1;
 stop slave;
 drop table if exists t1,t2,t3,t4,t5,t6,t7,t8,t9;
 reset master;
 reset slave;
 drop table if exists t1,t2,t3,t4,t5,t6,t7,t8,t9;
 start slave;
+SET @old_event_scheduler = @@global.event_scheduler;
+set global event_scheduler=1;
 set binlog_format=row;
 DROP EVENT IF EXISTS test.justonce;
 drop table if exists t1,t2;
@@ -34,7 +35,7 @@ db	name	status	originator
 test	justonce	SLAVESIDE_DISABLED	1
 "Dropping event test.slave_once on the slave"
 DROP EVENT IF EXISTS test.slave_once;
-CREATE EVENT test.slave_once ON SCHEDULE EVERY 5 MINUTE DO 
+CREATE EVENT test.slave_once ON SCHEDULE EVERY 5 MINUTE STARTS CURRENT_TIMESTAMP + INTERVAL 1 HOUR DO 
 INSERT IGNORE INTO t1(id, c) VALUES (3, 'from slave_once');
 "Checking event status on the slave for originator value = slave's server_id"
 SELECT db, name, status, originator FROM mysql.event WHERE db = 'test' AND name = 'slave_once';
@@ -45,7 +46,7 @@ DROP EVENT IF EXISTS test.slave_once;
 "Dropping event test.justonce on the master"
 DROP EVENT IF EXISTS test.justonce;
 "Creating event test.er on the master"
-CREATE EVENT test.er ON SCHEDULE EVERY 3 SECOND DO 
+CREATE EVENT test.er ON SCHEDULE EVERY 3 SECOND STARTS CURRENT_TIMESTAMP + INTERVAL 1 HOUR DO 
 INSERT IGNORE INTO t1(id, c) VALUES (4, 'from er');
 "Checking event status on the master"
 SELECT db, name, status, originator, body FROM mysql.event WHERE db = 'test' AND name = 'er';
@@ -56,7 +57,7 @@ SELECT db, name, status, originator, body FROM mysql.event WHERE db = 'test' AND
 db	name	status	originator	body
 test	er	SLAVESIDE_DISABLED	1	INSERT IGNORE INTO t1(id, c) VALUES (4, 'from er')
 "Altering event test.er on the master"
-ALTER EVENT test.er ON SCHEDULE EVERY 5 SECOND DO 
+ALTER EVENT test.er ON SCHEDULE EVERY 5 SECOND STARTS CURRENT_TIMESTAMP + INTERVAL 1 HOUR DO 
 INSERT IGNORE INTO t1(id, c) VALUES (5, 'from alter er');
 "Checking event status on the master"
 SELECT db, name, status, originator, body FROM mysql.event WHERE db = 'test' AND name = 'er';
@@ -75,7 +76,7 @@ db	name	status	originator
 SELECT db, name, status, originator FROM mysql.event WHERE db = 'test';
 db	name	status	originator
 "Creating event test.slave_terminate on the slave"
-CREATE EVENT test.slave_terminate ON SCHEDULE EVERY 3 SECOND DO 
+CREATE EVENT test.slave_terminate ON SCHEDULE EVERY 3 SECOND STARTS CURRENT_TIMESTAMP + INTERVAL 1 HOUR DO 
 INSERT IGNORE INTO t1(id, c) VALUES (6, 'from slave_terminate');
 "Checking event status on the slave"
 SELECT db, name, status, originator FROM mysql.event WHERE db = 'test' AND name = 'slave_terminate';
@@ -123,7 +124,7 @@ db	name	status	originator
 test	justonce	SLAVESIDE_DISABLED	1
 "Dropping event test.slave_once on the slave"
 DROP EVENT IF EXISTS test.slave_once;
-CREATE EVENT test.slave_once ON SCHEDULE EVERY 5 MINUTE DO 
+CREATE EVENT test.slave_once ON SCHEDULE EVERY 5 MINUTE STARTS CURRENT_TIMESTAMP + INTERVAL 1 HOUR DO 
 INSERT IGNORE INTO t1(id, c) VALUES (3, 'from slave_once');
 "Checking event status on the slave for originator value = slave's server_id"
 SELECT db, name, status, originator FROM mysql.event WHERE db = 'test' AND name = 'slave_once';
@@ -134,7 +135,7 @@ DROP EVENT IF EXISTS test.slave_once;
 "Dropping event test.justonce on the master"
 DROP EVENT IF EXISTS test.justonce;
 "Creating event test.er on the master"
-CREATE EVENT test.er ON SCHEDULE EVERY 3 SECOND DO 
+CREATE EVENT test.er ON SCHEDULE EVERY 3 SECOND STARTS CURRENT_TIMESTAMP + INTERVAL 1 HOUR DO 
 INSERT IGNORE INTO t1(id, c) VALUES (4, 'from er');
 "Checking event status on the master"
 SELECT db, name, status, originator, body FROM mysql.event WHERE db = 'test' AND name = 'er';
@@ -145,7 +146,7 @@ SELECT db, name, status, originator, body FROM mysql.event WHERE db = 'test' AND
 db	name	status	originator	body
 test	er	SLAVESIDE_DISABLED	1	INSERT IGNORE INTO t1(id, c) VALUES (4, 'from er')
 "Altering event test.er on the master"
-ALTER EVENT test.er ON SCHEDULE EVERY 5 SECOND DO 
+ALTER EVENT test.er ON SCHEDULE EVERY 5 SECOND STARTS CURRENT_TIMESTAMP + INTERVAL 1 HOUR DO 
 INSERT IGNORE INTO t1(id, c) VALUES (5, 'from alter er');
 "Checking event status on the master"
 SELECT db, name, status, originator, body FROM mysql.event WHERE db = 'test' AND name = 'er';
@@ -164,7 +165,7 @@ db	name	status	originator
 SELECT db, name, status, originator FROM mysql.event WHERE db = 'test';
 db	name	status	originator
 "Creating event test.slave_terminate on the slave"
-CREATE EVENT test.slave_terminate ON SCHEDULE EVERY 3 SECOND DO 
+CREATE EVENT test.slave_terminate ON SCHEDULE EVERY 3 SECOND STARTS CURRENT_TIMESTAMP + INTERVAL 1 HOUR DO 
 INSERT IGNORE INTO t1(id, c) VALUES (6, 'from slave_terminate');
 "Checking event status on the slave"
 SELECT db, name, status, originator FROM mysql.event WHERE db = 'test' AND name = 'slave_terminate';
@@ -190,4 +191,5 @@ select * from t28953;
 END;|
 ALTER EVENT event1 RENAME TO event2;
 DROP EVENT event2;
+SET @@global.event_scheduler= @old_event_scheduler;
 DROP TABLE t28953;
diff --git a/mysql-test/suite/rpl/t/rpl_cross_version-master.opt b/mysql-test/suite/rpl/t/rpl_cross_version-master.opt
new file mode 100644
index 00000000000..815a8f81d32
--- /dev/null
+++ b/mysql-test/suite/rpl/t/rpl_cross_version-master.opt
@@ -0,0 +1 @@
+--replicate-same-server-id --relay-log=slave-relay-bin
diff --git a/mysql-test/suite/rpl/t/rpl_cross_version.test b/mysql-test/suite/rpl/t/rpl_cross_version.test
new file mode 100644
index 00000000000..bb2ca350152
--- /dev/null
+++ b/mysql-test/suite/rpl/t/rpl_cross_version.test
@@ -0,0 +1,36 @@
+# ==== Purpose ====
+#
+# Verify cross-version replication from an old master to the up-to-date slave
+#
+# ==== Implementation ====
+#
+# Feed to the slave server a binlog recorded on an old version master 
+# via setting up slave-to-slave replication. The latter is done by means of
+# the opt file and include/setup_fake_relay_log.inc.
+# The master's binlog is treated as a relay log that the SQL thread executes.
+#
+
+--source include/have_log_bin.inc
+
+#
+# Bug#31240 load data infile replication between (4.0 or 4.1) and 5.1 fails
+#
+
+--echo ==== Initialize ====
+# the relay log contains create t1, t3 tables and load data infile
+--let $fake_relay_log = $MYSQL_TEST_DIR/suite/binlog/std_data/binlog_old_version_4_1.000001
+--source include/setup_fake_relay_log.inc
+
+--echo ==== Test ====
+start slave sql_thread;
+--let $slave_param = Exec_Master_Log_Pos
+# end_log_pos of the last event of the relay log
+--let $slave_param_value = 149436
+--source include/wait_for_slave_param.inc
+--echo ==== a prove that the fake has been processed successfully ====
+SELECT COUNT(*) - 17920 as zero FROM t3;
+
+--echo ==== Clean up ====
+stop slave sql_thread;
+--source include/cleanup_fake_relay_log.inc
+drop table t1, t3;
diff --git a/mysql-test/suite/rpl/t/rpl_events.test b/mysql-test/suite/rpl/t/rpl_events.test
index 2a9cf86fe55..d06a3118389 100644
--- a/mysql-test/suite/rpl/t/rpl_events.test
+++ b/mysql-test/suite/rpl/t/rpl_events.test
@@ -5,11 +5,12 @@
 # in both row based and statement based format                   #
 ##################################################################
 
-set global event_scheduler=1;
-
 --source include/not_embedded.inc
 --source include/master-slave.inc
 
+SET @old_event_scheduler = @@global.event_scheduler;
+set global event_scheduler=1;
+
 let $engine_type= MyISAM;
 
 set binlog_format=row;
@@ -51,5 +52,6 @@ sync_slave_with_master;
 # that there is no bad timing cauing it to try to access the table.
 
 connection master;
+SET @@global.event_scheduler= @old_event_scheduler;
 DROP TABLE t28953;
 sync_slave_with_master;
diff --git a/mysql-test/t/character_set_database_func.test b/mysql-test/t/character_set_database_func.test
index b2d2d017d64..5ba8669c816 100644
--- a/mysql-test/t/character_set_database_func.test
+++ b/mysql-test/t/character_set_database_func.test
@@ -29,6 +29,7 @@
 SET @global_character_set_database = @@global.character_set_database;
 SET @session_character_set_database = @@session.character_set_database;
 SET @session_character_set_server = @@session.character_set_server;
+SET @global_character_set_server = @@global.character_set_server;
 
 SET @@global.character_set_database = utf8;
 --echo 'connect (con1,localhost,root,,,,)'
@@ -106,10 +107,30 @@ SELECT count(*) FROM t1 WHERE CHAR_LENGTH(a)>1;
 DROP TABLE IF EXISTS t1;
 --enable_warnings
 
+
+#==============================================================================
+--echo 'Bug#27208: If no current database, character_set_database !=character_set_server'
+#==============================================================================
+
+SET GLOBAL character_set_server=latin5;
+
+connect (con2, localhost, root,,);
+connection con2;
+
+CREATE DATABASE csdb CHARACTER SET = utf8;
+USE csdb;
+DROP DATABASE csdb;
+SELECT @@character_set_database;
+
+connection default;
+disconnect con2;
+
+
 #restore
 SET @@global.character_set_database = @global_character_set_database;
 SET @@session.character_set_database = @session_character_set_database;
 SET @@session.character_set_server = @session_character_set_server;
+SET @@global.character_set_server = @global_character_set_server;
 ############################################################
 # End of functionality Testing for character_set_database  #
 ############################################################
diff --git a/mysql-test/t/date_formats.test b/mysql-test/t/date_formats.test
index e474fac8a2a..e5dc7ffa53e 100644
--- a/mysql-test/t/date_formats.test
+++ b/mysql-test/t/date_formats.test
@@ -6,10 +6,15 @@
 drop table if exists t1;
 --enable_warnings
 
---replace_result ROW <format> STATEMENT <format> MIXED <format>
-SHOW GLOBAL VARIABLES LIKE "%e_format";
---replace_result ROW <format> STATEMENT <format> MIXED <format>
-SHOW SESSION VARIABLES LIKE "%e_format";
+SELECT variable_name, variable_value
+FROM information_schema.global_variables
+WHERE variable_name IN ('date_format', 'datetime_format', 'time_format')
+ORDER BY variable_name;
+
+SELECT variable_name, variable_value
+FROM information_schema.session_variables
+WHERE variable_name IN ('date_format', 'datetime_format', 'time_format')
+ORDER BY variable_name;
 
 #
 # Test setting a lot of different formats to see which formats are accepted and
@@ -36,8 +41,10 @@ set datetime_format= '%H:%i:%s.%f %m-%d-%Y';
 set datetime_format= '%h:%i:%s %p %Y-%m-%d';
 set datetime_format= '%h:%i:%s.%f %p %Y-%m-%d';
 
---replace_result ROW <format> STATEMENT <format> MIXED <format>
-SHOW SESSION VARIABLES LIKE "%e_format";
+SELECT variable_name, variable_value
+FROM information_schema.session_variables
+WHERE variable_name IN ('date_format', 'datetime_format', 'time_format')
+ORDER BY variable_name;
 
 --error 1231
 SET time_format='%h:%i:%s';
@@ -121,7 +128,7 @@ SET datetime_format=default;
 # Test of str_to_date
 #
 
-# PS doesn't support fraction of a seconds
+# PS doesn't support fractions of a second
 --disable_ps_protocol
 select str_to_date(concat('15-01-2001',' 2:59:58.999'),
 	           concat('%d-%m-%Y',' ','%H:%i:%s.%f'));
diff --git a/mysql-test/t/having.test b/mysql-test/t/having.test
index 683abfd3783..af9af4fe1fc 100644
--- a/mysql-test/t/having.test
+++ b/mysql-test/t/having.test
@@ -432,3 +432,14 @@ select f1 from t1 having max(f1)=f1;
 select f1 from t1 group by f1 having max(f1)=f1;
 set session sql_mode='';
 drop table t1;
+
+
+#
+# Bug #38637: COUNT DISTINCT prevents NULL testing in HAVING clause
+#
+CREATE TABLE t1 ( a INT, b INT);
+INSERT INTO t1 VALUES (1, 1), (2,2), (3, NULL);
+SELECT b, COUNT(DISTINCT a) FROM t1 GROUP BY b HAVING b is NULL;
+DROP TABLE t1;
+
+--echo End of 5.0 tests
diff --git a/mysql-test/t/innodb-semi-consistent-master.opt b/mysql-test/t/innodb-semi-consistent-master.opt
index 2746e4e184e..e76299453d3 100644
--- a/mysql-test/t/innodb-semi-consistent-master.opt
+++ b/mysql-test/t/innodb-semi-consistent-master.opt
@@ -1 +1 @@
---innodb_locks_unsafe_for_binlog=true --innodb_lock_wait_timeout=2
+--innodb_lock_wait_timeout=2
diff --git a/mysql-test/t/innodb-semi-consistent.test b/mysql-test/t/innodb-semi-consistent.test
index a3496625e95..6d3020bb560 100644
--- a/mysql-test/t/innodb-semi-consistent.test
+++ b/mysql-test/t/innodb-semi-consistent.test
@@ -11,7 +11,7 @@ connect (a,localhost,root,,);
 connect (b,localhost,root,,);
 connection a;
 set binlog_format=mixed;
-set session transaction isolation level read committed;
+set session transaction isolation level repeatable read;
 create table t1(a int not null) engine=innodb DEFAULT CHARSET=latin1;
 insert into t1 values (1),(2),(3),(4),(5),(6),(7);
 set autocommit=0;
@@ -19,13 +19,15 @@ set autocommit=0;
 select * from t1 where a=3 lock in share mode;
 connection b;
 set binlog_format=mixed;
-set session transaction isolation level read committed;
+set session transaction isolation level repeatable read;
 set autocommit=0;
 -- error ER_LOCK_WAIT_TIMEOUT
 update t1 set a=10 where a=5;
 connection a;
 commit;
 connection b;
+# perform a semi-consisent read (and unlock non-matching rows)
+set session transaction isolation level read committed;
 update t1 set a=10 where a=5;
 connection a;
 -- error ER_LOCK_WAIT_TIMEOUT
@@ -33,6 +35,7 @@ select * from t1 where a=2 for update;
 # this should lock the records (1),(2)
 select * from t1 where a=2 limit 1 for update;
 connection b;
+# semi-consistent read will skip non-matching locked rows a=1, a=2
 update t1 set a=11 where a=6;
 -- error ER_LOCK_WAIT_TIMEOUT
 update t1 set a=12 where a=2;
diff --git a/mysql-test/t/myisampack.test b/mysql-test/t/myisampack.test
index 3b55154d433..8d4bb83dc01 100644
--- a/mysql-test/t/myisampack.test
+++ b/mysql-test/t/myisampack.test
@@ -34,6 +34,8 @@ DROP TABLE t1;
 
 #
 # Bug#40949 Debug version of MySQL server crashes when run OPTIMIZE on compressed table.
+# expanded with testcase for
+# BUG#41574 - REPAIR TABLE: crashes for compressed tables
 #
 --disable_warnings
 drop table if exists t1;
@@ -55,4 +57,5 @@ insert into t1 select * from t1;
 flush tables;
 --exec $MYISAMPACK $MYSQLTEST_VARDIR/master-data/test/t1
 optimize table t1;
+repair table t1;
 drop table t1;
diff --git a/mysql-test/t/partition_innodb_semi_consistent.test b/mysql-test/t/partition_innodb_semi_consistent.test
index cfa170f575b..6a6a7cf958e 100644
--- a/mysql-test/t/partition_innodb_semi_consistent.test
+++ b/mysql-test/t/partition_innodb_semi_consistent.test
@@ -14,7 +14,7 @@ connect (a,localhost,root,,);
 connect (b,localhost,root,,);
 connection a;
 set binlog_format=mixed;
-set session transaction isolation level read committed;
+set session transaction isolation level repeatable read;
 create table t1(a int not null)
 engine=innodb
 DEFAULT CHARSET=latin1
@@ -27,7 +27,7 @@ set autocommit=0;
 select * from t1 where a=3 lock in share mode;
 connection b;
 set binlog_format=mixed;
-set session transaction isolation level read committed;
+set session transaction isolation level repeatable read;
 set autocommit=0;
 -- error ER_LOCK_WAIT_TIMEOUT
 update t1 set a=10 where a=5;
@@ -35,6 +35,8 @@ connection a;
 #DELETE FROM t1 WHERE a=5;
 commit;
 connection b;
+# perform a semi-consisent read (and unlock non-matching rows)
+set session transaction isolation level read committed;
 update t1 set a=10 where a=5;
 connection a;
 -- error ER_LOCK_WAIT_TIMEOUT
@@ -42,6 +44,7 @@ select * from t1 where a=2 for update;
 # this should lock the records (1),(2)
 select * from t1 where a=2 limit 1 for update;
 connection b;
+# semi-consistent read will skip non-matching locked rows a=1, a=2
 update t1 set a=11 where a=6;
 -- error ER_LOCK_WAIT_TIMEOUT
 update t1 set a=12 where a=2;
diff --git a/mysql-test/t/query_cache_notembedded.test b/mysql-test/t/query_cache_notembedded.test
index 929b93e10d5..967b15d3d95 100644
--- a/mysql-test/t/query_cache_notembedded.test
+++ b/mysql-test/t/query_cache_notembedded.test
@@ -224,6 +224,38 @@ disconnect con2;
 connection default;
 
 set GLOBAL query_cache_size=0;
+
+#
+# Bug#40264: Aborted cached query causes query to hang indefinitely on next cache hit
+#
+
+--disable_warnings
+DROP TABLE IF EXISTS t1;
+--enable_warnings
+
+FLUSH STATUS;
+SET GLOBAL query_cache_size=1048576;
+CREATE TABLE t1 (a INT);
+INSERT INTO t1 VALUES (1),(2),(3),(4),(5);
+SHOW STATUS LIKE 'Qcache_queries_in_cache';
+LOCK TABLES t1 WRITE;
+connect(con1,localhost,root,,);
+--send SELECT * FROM t1
+connection default;
+let $show_type= open tables where `table`='t1' and in_use=2;
+let $show_pattern= '%t1%2%';
+--source include/wait_show_pattern.inc
+dirty_close con1;
+UNLOCK TABLES;
+let $show_type= open tables where `table`='t1' and in_use=0;
+let $show_pattern= '%t1%0%';
+--source include/wait_show_pattern.inc
+SHOW STATUS LIKE 'Qcache_queries_in_cache';
+DROP TABLE t1;
+SET GLOBAL query_cache_size= default;
+
+# End of 5.0 tests
+
 SET GLOBAL log_bin_trust_function_creators = 0;
 
 #
diff --git a/sql/item.cc b/sql/item.cc
index d3f933dc13f..2ee6de97ad0 100644
--- a/sql/item.cc
+++ b/sql/item.cc
@@ -2090,6 +2090,12 @@ bool Item_field::val_bool_result()
 }
 
 
+bool Item_field::is_null_result()
+{
+  return (null_value=result_field->is_null());
+}
+
+
 bool Item_field::eq(const Item *item, bool binary_cmp) const
 {
   Item *real_item= ((Item *) item)->real_item();
@@ -5800,6 +5806,15 @@ double Item_ref::val_result()
 }
 
 
+bool Item_ref::is_null_result()
+{
+  if (result_field)
+    return (null_value=result_field->is_null());
+
+  return is_null();
+}
+
+
 longlong Item_ref::val_int_result()
 {
   if (result_field)
@@ -5905,7 +5920,9 @@ String *Item_ref::val_str(String* tmp)
 bool Item_ref::is_null()
 {
   DBUG_ASSERT(fixed);
-  return (*ref)->is_null();
+  bool tmp=(*ref)->is_null_result();
+  null_value=(*ref)->null_value;
+  return tmp;
 }
 
 
diff --git a/sql/item.h b/sql/item.h
index 8c58f0cebe9..be9daf672f0 100644
--- a/sql/item.h
+++ b/sql/item.h
@@ -729,6 +729,7 @@ public:
   virtual my_decimal *val_decimal_result(my_decimal *val)
   { return val_decimal(val); }
   virtual bool val_bool_result() { return val_bool(); }
+  virtual bool is_null_result() { return is_null(); }
 
   /* bit map of tables used by item */
   virtual table_map used_tables() const { return (table_map) 0L; }
@@ -1436,6 +1437,7 @@ public:
   String *str_result(String* tmp);
   my_decimal *val_decimal_result(my_decimal *);
   bool val_bool_result();
+  bool is_null_result();
   bool send(Protocol *protocol, String *str_arg);
   void reset_field(Field *f);
   bool fix_fields(THD *, Item **);
@@ -2178,6 +2180,7 @@ public:
   String *str_result(String* tmp);
   my_decimal *val_decimal_result(my_decimal *);
   bool val_bool_result();
+  bool is_null_result();
   bool send(Protocol *prot, String *tmp);
   void make_field(Send_field *field);
   bool fix_fields(THD *, Item **);
diff --git a/sql/item_func.cc b/sql/item_func.cc
index 3cf1671bfa7..ff0c22ecfa9 100644
--- a/sql/item_func.cc
+++ b/sql/item_func.cc
@@ -4307,6 +4307,15 @@ my_decimal *Item_func_set_user_var::val_decimal_result(my_decimal *val)
 }
 
 
+bool Item_func_set_user_var::is_null_result()
+{
+  DBUG_ASSERT(fixed == 1);
+  check(TRUE);
+  update();					// Store expression
+  return is_null();
+}
+
+
 void Item_func_set_user_var::print(String *str, enum_query_type query_type)
 {
   str->append(STRING_WITH_LEN("(@"));
diff --git a/sql/item_func.h b/sql/item_func.h
index 512da28589a..e2937a4daf8 100644
--- a/sql/item_func.h
+++ b/sql/item_func.h
@@ -1335,6 +1335,7 @@ public:
   longlong val_int_result();
   String *str_result(String *str);
   my_decimal *val_decimal_result(my_decimal *);
+  bool is_null_result();
   bool update_hash(void *ptr, uint length, enum Item_result type,
   		   CHARSET_INFO *cs, Derivation dv, bool unsigned_arg);
   bool send(Protocol *protocol, String *str_arg);
diff --git a/sql/log_event.cc b/sql/log_event.cc
index 3a3350a4eb8..be209b6c6c7 100644
--- a/sql/log_event.cc
+++ b/sql/log_event.cc
@@ -5945,8 +5945,15 @@ void Create_file_log_event::pack_info(Protocol *protocol)
 #endif /* defined(HAVE_REPLICATION) && !defined(MYSQL_CLIENT) */
 
 
-/*
+/**
   Create_file_log_event::do_apply_event()
+  Constructor for Create_file_log_event to intantiate an event
+  from the relay log on the slave.
+
+  @retval
+    0           Success
+  @retval
+    1           Failure
 */
 
 #if defined(HAVE_REPLICATION) && !defined(MYSQL_CLIENT)
@@ -6015,7 +6022,7 @@ err:
   if (fd >= 0)
     my_close(fd, MYF(0));
   thd_proc_info(thd, 0);
-  return error == 0;
+  return error != 0;
 }
 #endif /* defined(HAVE_REPLICATION) && !defined(MYSQL_CLIENT) */
 
diff --git a/sql/sql_cache.cc b/sql/sql_cache.cc
index 5e098edbd7f..7c97ee4cf32 100644
--- a/sql/sql_cache.cc
+++ b/sql/sql_cache.cc
@@ -781,6 +781,9 @@ void query_cache_end_of_result(THD *thd)
   if (thd->net.query_cache_query == 0)
     DBUG_VOID_RETURN;
 
+  /* Ensure that only complete results are cached. */
+  DBUG_ASSERT(thd->main_da.is_eof());
+
   if (thd->killed)
   {
     query_cache_abort(&thd->net);
diff --git a/storage/innobase/handler/ha_innodb.cc b/storage/innobase/handler/ha_innodb.cc
index 6358f7ce055..5d895833f42 100644
--- a/storage/innobase/handler/ha_innodb.cc
+++ b/storage/innobase/handler/ha_innodb.cc
@@ -128,7 +128,7 @@ static my_bool	innobase_file_per_table			= FALSE;
 static my_bool	innobase_locks_unsafe_for_binlog	= FALSE;
 static my_bool	innobase_rollback_on_timeout		= FALSE;
 static my_bool	innobase_create_status_file		= FALSE;
-static my_bool innobase_stats_on_metadata		= TRUE;
+static my_bool	innobase_stats_on_metadata		= TRUE;
 static my_bool	innobase_adaptive_hash_index	= TRUE;
 
 static char*	internal_innobase_data_file_path	= NULL;
@@ -461,7 +461,7 @@ innodb_srv_conc_exit_innodb(
 /*========================*/
 	trx_t*	trx)	/* in: transaction handle */
 {
-	if (UNIV_LIKELY(!srv_thread_concurrency)) {
+	if (UNIV_LIKELY(!trx->declared_to_be_inside_innodb)) {
 
 		return;
 	}
@@ -1713,8 +1713,6 @@ innobase_init(
 	srv_max_n_open_files = (ulint) innobase_open_files;
 	srv_innodb_status = (ibool) innobase_create_status_file;
 
-	srv_stats_on_metadata = (ibool) innobase_stats_on_metadata;
-
 	srv_use_adaptive_hash_indexes =
 		(ibool) innobase_adaptive_hash_index;
 
@@ -2510,6 +2508,8 @@ retry:
 	prebuilt = row_create_prebuilt(ib_table);
 
 	prebuilt->mysql_row_len = table->s->reclength;
+	prebuilt->default_rec = table->s->default_values;
+	ut_ad(prebuilt->default_rec);
 
 	/* Looks like MySQL-3.23 sometimes has primary key number != 0 */
 
@@ -3687,7 +3687,7 @@ no_commit:
 
 			/* We don't want to mask autoinc overflow errors. */
 			if (prebuilt->autoinc_error != DB_SUCCESS) {
-				error = prebuilt->autoinc_error;
+				error = (int) prebuilt->autoinc_error;
 
 				goto report_error;
 			}
@@ -4129,7 +4129,8 @@ ha_innobase::unlock_row(void)
 	switch (prebuilt->row_read_type) {
 	case ROW_READ_WITH_LOCKS:
 		if (!srv_locks_unsafe_for_binlog
-		|| prebuilt->trx->isolation_level == TRX_ISO_READ_COMMITTED) {
+		    && prebuilt->trx->isolation_level
+		    != TRX_ISO_READ_COMMITTED) {
 			break;
 		}
 		/* fall through */
@@ -5976,7 +5977,7 @@ ha_innobase::info(
 	ib_table = prebuilt->table;
 
 	if (flag & HA_STATUS_TIME) {
-		if (srv_stats_on_metadata) {
+		if (innobase_stats_on_metadata) {
 			/* In sql_show we call with this flag: update
 			then statistics so that they are up-to-date */
 
@@ -6024,11 +6025,13 @@ ha_innobase::info(
 			n_rows++;
 		}
 
-		/* Fix bug#29507: TRUNCATE shows too many rows affected.
-		Do not show the estimates for TRUNCATE command. */
+		/* Fix bug#40386: Not flushing query cache after truncate.
+		n_rows can not be 0 unless the table is empty, set to 1
+		instead. The original problem of bug#29507 is actually
+		fixed in the server code. */
 		if (thd_sql_command(user_thd) == SQLCOM_TRUNCATE) {
 
-			n_rows = 0;
+			n_rows = 1;
 
 			/* We need to reset the prebuilt value too, otherwise
 			checks for values greater than the last value written
@@ -8236,7 +8239,7 @@ static MYSQL_SYSVAR_BOOL(status_file, innobase_create_status_file,
   NULL, NULL, FALSE);
 
 static MYSQL_SYSVAR_BOOL(stats_on_metadata, innobase_stats_on_metadata,
-  PLUGIN_VAR_OPCMDARG | PLUGIN_VAR_NOSYSVAR,
+  PLUGIN_VAR_OPCMDARG,
   "Enable statistics gathering for metadata commands such as SHOW TABLE STATUS (on by default)",
   NULL, NULL, TRUE);
 
diff --git a/storage/innobase/include/data0type.ic b/storage/innobase/include/data0type.ic
index b8c24bb074a..ad0f95755d2 100644
--- a/storage/innobase/include/data0type.ic
+++ b/storage/innobase/include/data0type.ic
@@ -558,5 +558,5 @@ dtype_get_sql_null_size(
 	const dtype_t*	type)	/* in: type */
 {
 	return(dtype_get_fixed_size_low(type->mtype, type->prtype, type->len,
-					type->mbminlen, type->mbmaxlen) > 0);
+					type->mbminlen, type->mbmaxlen));
 }
diff --git a/storage/innobase/include/hash0hash.ic b/storage/innobase/include/hash0hash.ic
index 49bcc7b31d0..d246d8ee831 100644
--- a/storage/innobase/include/hash0hash.ic
+++ b/storage/innobase/include/hash0hash.ic
@@ -58,7 +58,8 @@ hash_get_mutex_no(
 	hash_table_t*	table,	/* in: hash table */
 	ulint		fold)	/* in: fold */
 {
-	return(ut_2pow_remainder(fold, table->n_mutexes));
+	return(ut_2pow_remainder(hash_calc_hash(fold, table),
+				 table->n_mutexes));
 }
 
 /****************************************************************
diff --git a/storage/innobase/include/row0mysql.h b/storage/innobase/include/row0mysql.h
index 9c3ba558d3c..9b2f3250486 100644
--- a/storage/innobase/include/row0mysql.h
+++ b/storage/innobase/include/row0mysql.h
@@ -594,6 +594,8 @@ struct row_prebuilt_struct {
 	byte*		ins_upd_rec_buff;/* buffer for storing data converted
 					to the Innobase format from the MySQL
 					format */
+	const byte*	default_rec;	/* the default values of all columns
+					(a "default row") in MySQL format */
 	ulint		hint_need_to_fetch_extra_cols;
 					/* normally this is set to 0; if this
 					is set to ROW_RETRIEVE_PRIMARY_KEY,
diff --git a/storage/innobase/include/srv0srv.h b/storage/innobase/include/srv0srv.h
index 91daa6816b2..2516937565d 100644
--- a/storage/innobase/include/srv0srv.h
+++ b/storage/innobase/include/srv0srv.h
@@ -124,8 +124,6 @@ extern ulint	srv_fast_shutdown;	 /* If this is 1, do not do a
 					 transactions). */
 extern ibool	srv_innodb_status;
 
-extern ibool	srv_stats_on_metadata;
-
 extern ibool	srv_use_doublewrite_buf;
 extern ibool	srv_use_checksums;
 
diff --git a/storage/innobase/row/row0mysql.c b/storage/innobase/row/row0mysql.c
index d76af54b420..088d944cb91 100644
--- a/storage/innobase/row/row0mysql.c
+++ b/storage/innobase/row/row0mysql.c
@@ -342,7 +342,7 @@ row_mysql_store_col_in_innobase_format(
 		/* In some cases we strip trailing spaces from UTF-8 and other
 		multibyte charsets, from FIXED-length CHAR columns, to save
 		space. UTF-8 would otherwise normally use 3 * the string length
-		bytes to store a latin1 string! */
+		bytes to store an ASCII string! */
 
 		/* We assume that this CHAR field is encoded in a
 		variable-length character set where spaces have
@@ -620,6 +620,7 @@ row_create_prebuilt(
 	prebuilt->ins_node = NULL;
 
 	prebuilt->ins_upd_rec_buff = NULL;
+	prebuilt->default_rec = NULL;
 
 	prebuilt->upd_node = NULL;
 	prebuilt->ins_graph = NULL;
@@ -1485,12 +1486,13 @@ row_unlock_for_mysql(
 	ut_ad(prebuilt && trx);
 	ut_ad(trx->mysql_thread_id == os_thread_get_curr_id());
 
-	if (!(srv_locks_unsafe_for_binlog
-	      || trx->isolation_level == TRX_ISO_READ_COMMITTED)) {
+	if (UNIV_UNLIKELY
+	    (!srv_locks_unsafe_for_binlog
+	     && trx->isolation_level != TRX_ISO_READ_COMMITTED)) {
 
 		fprintf(stderr,
 			"InnoDB: Error: calling row_unlock_for_mysql though\n"
-			"InnoDB: srv_locks_unsafe_for_binlog is FALSE and\n"
+			"InnoDB: innodb_locks_unsafe_for_binlog is FALSE and\n"
 			"InnoDB: this session is not using"
 			" READ COMMITTED isolation level.\n");
 
diff --git a/storage/innobase/row/row0sel.c b/storage/innobase/row/row0sel.c
index 79f107ce77d..f53dfe8a686 100644
--- a/storage/innobase/row/row0sel.c
+++ b/storage/innobase/row/row0sel.c
@@ -2597,6 +2597,7 @@ row_sel_store_mysql_rec(
 	ulint			i;
 
 	ut_ad(prebuilt->mysql_template);
+	ut_ad(prebuilt->default_rec);
 	ut_ad(rec_offs_validate(rec, NULL, offsets));
 
 	if (UNIV_LIKELY_NULL(prebuilt->blob_heap)) {
@@ -2683,58 +2684,14 @@ row_sel_store_mysql_rec(
 					&= ~(byte) templ->mysql_null_bit_mask;
 			}
 		} else {
-			/* MySQL seems to assume the field for an SQL NULL
-			value is set to zero or space. Not taking this into
-			account caused seg faults with NULL BLOB fields, and
-			bug number 154 in the MySQL bug database: GROUP BY
-			and DISTINCT could treat NULL values inequal. */
-			int	pad_char;
+			/* MySQL assumes that the field for an SQL
+			NULL value is set to the default value. */
 
 			mysql_rec[templ->mysql_null_byte_offset]
 				|= (byte) templ->mysql_null_bit_mask;
-			switch (templ->type) {
-			case DATA_VARCHAR:
-			case DATA_BINARY:
-			case DATA_VARMYSQL:
-				if (templ->mysql_type
-				    == DATA_MYSQL_TRUE_VARCHAR) {
-					/* This is a >= 5.0.3 type
-					true VARCHAR.  Zero the field. */
-					pad_char = 0x00;
-					break;
-				}
-				/* Fall through */
-			case DATA_CHAR:
-			case DATA_FIXBINARY:
-			case DATA_MYSQL:
-				/* MySQL pads all string types (except
-				BLOB, TEXT and true VARCHAR) with space. */
-				if (UNIV_UNLIKELY(templ->mbminlen == 2)) {
-					/* Treat UCS2 as a special case. */
-					data = mysql_rec
-						+ templ->mysql_col_offset;
-					len = templ->mysql_col_len;
-					/* There are two UCS2 bytes per char,
-					so the length has to be even. */
-					ut_a(!(len & 1));
-					/* Pad with 0x0020. */
-					while (len) {
-						*data++ = 0x00;
-						*data++ = 0x20;
-						len -= 2;
-					}
-					continue;
-				}
-				pad_char = 0x20;
-				break;
-			default:
-				pad_char = 0x00;
-				break;
-			}
-
-			ut_ad(!pad_char || templ->mbminlen == 1);
-			memset(mysql_rec + templ->mysql_col_offset,
-			       pad_char, templ->mysql_col_len);
+			memcpy(mysql_rec + templ->mysql_col_offset,
+			       prebuilt->default_rec + templ->mysql_col_offset,
+			       templ->mysql_col_len);
 		}
 	}
 
diff --git a/storage/innobase/srv/srv0srv.c b/storage/innobase/srv/srv0srv.c
index e8b7bd4cee2..e2d8bd4c600 100644
--- a/storage/innobase/srv/srv0srv.c
+++ b/storage/innobase/srv/srv0srv.c
@@ -283,13 +283,16 @@ ulong	srv_commit_concurrency	= 0;
 
 os_fast_mutex_t	srv_conc_mutex;		/* this mutex protects srv_conc data
 					structures */
-lint	srv_conc_n_threads	= 0;	/* number of OS threads currently
-					inside InnoDB; it is not an error
-					if this drops temporarily below zero
-					because we do not demand that every
-					thread increments this, but a thread
-					waiting for a lock decrements this
-					temporarily */
+lint	srv_conc_n_threads	= 0;	/* number of transactions that
+					have declared_to_be_inside_innodb
+					set. It used to be a non-error
+					for this value to drop below
+					zero temporarily. This is no
+					longer true. We'll, however,
+					keep the lint datatype to add
+					assertions to catch any corner
+					cases that we may have
+					missed. */
 ulint	srv_conc_n_waiting_threads = 0;	/* number of OS threads waiting in the
 					FIFO for a permission to enter InnoDB
 					*/
@@ -328,8 +331,6 @@ ulint	srv_fast_shutdown	= 0;
 /* Generate a innodb_status.<pid> file */
 ibool	srv_innodb_status	= FALSE;
 
-ibool	srv_stats_on_metadata	= TRUE;
-
 ibool	srv_use_doublewrite_buf	= TRUE;
 ibool	srv_use_checksums = TRUE;
 
@@ -1022,6 +1023,8 @@ retry:
 		return;
 	}
 
+	ut_ad(srv_conc_n_threads >= 0);
+
 	if (srv_conc_n_threads < (lint)srv_thread_concurrency) {
 
 		srv_conc_n_threads++;
@@ -1148,6 +1151,8 @@ srv_conc_force_enter_innodb(
 		return;
 	}
 
+	ut_ad(srv_conc_n_threads >= 0);
+
 	os_fast_mutex_lock(&srv_conc_mutex);
 
 	srv_conc_n_threads++;
@@ -1169,11 +1174,6 @@ srv_conc_force_exit_innodb(
 {
 	srv_conc_slot_t*	slot	= NULL;
 
-	if (UNIV_LIKELY(!srv_thread_concurrency)) {
-
-		return;
-	}
-
 	if (trx->mysql_thd != NULL
 	    && thd_is_replication_slave_thread(trx->mysql_thd)) {
 
@@ -1187,6 +1187,7 @@ srv_conc_force_exit_innodb(
 
 	os_fast_mutex_lock(&srv_conc_mutex);
 
+	ut_ad(srv_conc_n_threads > 0);
 	srv_conc_n_threads--;
 	trx->declared_to_be_inside_innodb = FALSE;
 	trx->n_tickets_to_enter_innodb = 0;
diff --git a/storage/innobase/trx/trx0trx.c b/storage/innobase/trx/trx0trx.c
index 69b72451f2b..1fceaa3562c 100644
--- a/storage/innobase/trx/trx0trx.c
+++ b/storage/innobase/trx/trx0trx.c
@@ -287,6 +287,10 @@ trx_free(
 		      "InnoDB: inside InnoDB.\n", stderr);
 		trx_print(stderr, trx, 600);
 		putc('\n', stderr);
+
+		/* This is an error but not a fatal error. We must keep
+		the counters like srv_conc_n_threads accurate. */
+		srv_conc_force_exit_innodb(trx);
 	}
 
 	if (trx->n_mysql_tables_in_use != 0
diff --git a/storage/innobase/trx/trx0undo.c b/storage/innobase/trx/trx0undo.c
index 2aa7752d292..b31580d0ce0 100644
--- a/storage/innobase/trx/trx0undo.c
+++ b/storage/innobase/trx/trx0undo.c
@@ -410,7 +410,7 @@ trx_undo_seg_create(
 	if (slot_no == ULINT_UNDEFINED) {
 		ut_print_timestamp(stderr);
 		fprintf(stderr,
-			"InnoDB: Warning: cannot find a free slot for"
+			"  InnoDB: Warning: cannot find a free slot for"
 			" an undo log. Do you have too\n"
 			"InnoDB: many active transactions"
 			" running concurrently?\n");