diff --git a/debian/autobake-deb.sh b/debian/autobake-deb.sh
index 37630714d5055..b1e7a8453efa9 100755
--- a/debian/autobake-deb.sh
+++ b/debian/autobake-deb.sh
@@ -30,9 +30,12 @@ then
   # build is not running on Travis or Gitlab-CI
   sed '/-DPLUGIN_COLUMNSTORE=NO/d' -i debian/rules
   # Take the files and part of control from MCS directory
-  cp -v storage/columnstore/columnstore/debian/mariadb-plugin-columnstore.* debian/
-  echo >> debian/control
-  cat storage/columnstore/columnstore/debian/control >> debian/control
+  if [ ! -f debian/mariadb-plugin-columnstore.install ]
+  then
+    cp -v storage/columnstore/columnstore/debian/mariadb-plugin-columnstore.* debian/
+    echo >> debian/control
+    cat storage/columnstore/columnstore/debian/control >> debian/control
+  fi
 fi
 
 # Look up distro-version specific stuff
@@ -128,6 +131,11 @@ case "${CODENAME}" in
     exit 1
 esac
 
+if [ -n "${AUTOBAKE_PREP_CONTROL_RULES_ONLY:-}" ]
+then
+  exit 0
+fi
+
 # Adjust changelog, add new version
 echo "Incrementing changelog and starting build scripts"
 
diff --git a/debian/rules b/debian/rules
index d3d7d5f8934e0..aaca566d55780 100755
--- a/debian/rules
+++ b/debian/rules
@@ -112,7 +112,7 @@ override_dh_auto_build:
 	@echo "RULES.$@"
 	# Print build env info to help debug builds on different platforms
 	dpkg-architecture
-	cd $(BUILDDIR) && $(MAKE)
+	cd $(BUILDDIR) && $(MAKE) --output-sync=target
 
 override_dh_auto_test:
 	@echo "RULES.$@"
diff --git a/debian/salsa-ci.yml b/debian/salsa-ci.yml
index 1659f3e597267..3a69c45ead995 100644
--- a/debian/salsa-ci.yml
+++ b/debian/salsa-ci.yml
@@ -34,7 +34,7 @@ build:
     - mv ${CCACHE_WORK_DIR} ${CCACHE_TMP_DIR}
     # Run Salsa-CI .build-script equivalent, with extra devscripts so autobake-deb.sh can run 'dch'
     - export CCACHE_DIR=${CCACHE_TMP_DIR}
-    - apt-get update && eatmydata apt-get install --no-install-recommends -y ccache fakeroot build-essential devscripts
+    - apt-get update && eatmydata apt-get install --no-install-recommends -y ccache fakeroot build-essential devscripts lsb-release
     - cd ${WORKING_DIR}/${SOURCE_DIR}
     - eatmydata apt-get build-dep --no-install-recommends -y .
     - update-ccache-symlinks; ccache -z # Zero out ccache counters
diff --git a/extra/innochecksum.cc b/extra/innochecksum.cc
index befd89290c1a9..4dc65c8d9bc69 100644
--- a/extra/innochecksum.cc
+++ b/extra/innochecksum.cc
@@ -1790,6 +1790,18 @@ int main(
 			}
 
 			if (ferror(fil_in)) {
+#ifdef _AIX
+				/*
+				  AIX fseeko can go past eof without error.
+				  the error occurs on read, hence output the
+				  same error here as would show up on other
+				  platforms. This shows up in the mtr test
+				  innodb_zip.innochecksum_3-4k,crc32,innodb
+				*/
+				if (errno == EFBIG) {
+					goto unexpected_eof;
+				}
+#endif
 				fprintf(stderr, "Error reading " ULINTPF " bytes",
 					physical_page_size);
 				perror(" ");
diff --git a/mysql-test/main/information_schema.result b/mysql-test/main/information_schema.result
index ad78f413ea1e2..0ce5cbea37d72 100644
--- a/mysql-test/main/information_schema.result
+++ b/mysql-test/main/information_schema.result
@@ -2532,3 +2532,24 @@ progress
 #
 # End of 10.3 tests
 #
+#
+# Start of 10.5 tests
+#
+#
+# MDEV-26507 Assertion `tmp != ((long long) 0x8000000000000000LL)' failed in TIME_from_longlong_datetime_packed
+#
+CREATE TABLE t1 (a int);
+CREATE ALGORITHM=TEMPTABLE VIEW i AS
+SELECT a.created
+FROM t1 w JOIN INFORMATION_SCHEMA.routines a
+WHERE a.routine_name='not existing'
+  ORDER BY a.last_altered;
+SET SESSION sql_mode='ALLOW_INVALID_DATES';
+SELECT * FROM i;
+created
+SET SESSION sql_mode=DEFAULT;
+DROP VIEW i;
+DROP TABLE t1;
+#
+# End of 10.5 tests
+#
diff --git a/mysql-test/main/information_schema.test b/mysql-test/main/information_schema.test
index 0c403caa59914..27f5dd6103d49 100644
--- a/mysql-test/main/information_schema.test
+++ b/mysql-test/main/information_schema.test
@@ -2111,3 +2111,27 @@ select progress from information_schema.processlist limit 1;
 --echo #
 --echo # End of 10.3 tests
 --echo #
+
+--echo #
+--echo # Start of 10.5 tests
+--echo #
+
+--echo #
+--echo # MDEV-26507 Assertion `tmp != ((long long) 0x8000000000000000LL)' failed in TIME_from_longlong_datetime_packed
+--echo #
+
+CREATE TABLE t1 (a int);
+CREATE ALGORITHM=TEMPTABLE VIEW i AS
+  SELECT a.created
+  FROM t1 w JOIN INFORMATION_SCHEMA.routines a
+  WHERE a.routine_name='not existing'
+  ORDER BY a.last_altered;
+SET SESSION sql_mode='ALLOW_INVALID_DATES';
+SELECT * FROM i;
+SET SESSION sql_mode=DEFAULT;
+DROP VIEW i;
+DROP TABLE t1;
+
+--echo #
+--echo # End of 10.5 tests
+--echo #
diff --git a/mysql-test/main/keywords.result b/mysql-test/main/keywords.result
index 2765c05b3cbe7..483a8f7e7e88e 100644
--- a/mysql-test/main/keywords.result
+++ b/mysql-test/main/keywords.result
@@ -391,3 +391,424 @@ END
 $$
 compressed
 1
+#
+# Testing various keywords in various contexts
+#
+CREATE PROCEDURE p1(query TEXT, var TEXT)
+BEGIN
+DECLARE errmsg TEXT DEFAULT '';
+DECLARE CONTINUE HANDLER
+FOR SQLEXCEPTION
+BEGIN
+GET DIAGNOSTICS CONDITION 1 errmsg = MESSAGE_TEXT;
+SET errmsg= REPLACE(errmsg, 'You have an error in your SQL ', '..');
+SET errmsg= REPLACE(errmsg, '; check the manual that corresponds to your MariaDB server version for the right syntax to use', '..');
+END;
+SET query=REPLACE(query, '$(VAR)', var);
+EXECUTE IMMEDIATE query;
+SELECT CONCAT(query, '; -- ', LEFT(COALESCE(errmsg,''),40)) AS `--------`;
+END;
+$$
+CREATE PROCEDURE p2(query TEXT)
+BEGIN
+FOR row IN (SELECT word FROM t1 ORDER BY category, word)
+DO
+CALL p1(query, row.word);
+END FOR;
+END;
+$$
+CREATE TABLE t1 (word TEXT, category TEXT);
+INSERT INTO t1 VALUES ('non_keyword', '00 Simple identifier');
+INSERT INTO t1 VALUES ('lpad', '01 Built-in native function');
+INSERT INTO t1 VALUES ('rpad', '01 Built-in native function');
+INSERT INTO t1 VALUES ('adddate',     '02 function_call_nonkeyword');
+INSERT INTO t1 VALUES ('substr',      '02 function_call_nonkeyword');
+INSERT INTO t1 VALUES ('substring',   '02 function_call_nonkeyword');
+INSERT INTO t1 VALUES ('trim_oracle', '02 function_call_nonkeyword');
+INSERT INTO t1 VALUES ('ascii',         '03 function_call_conflict');
+INSERT INTO t1 VALUES ('replace',       '03 function_call_conflict');
+INSERT INTO t1 VALUES ('weight_string', '03 function_call_conflict');
+INSERT INTO t1 VALUES ('char', '04 function_call_keyword');
+INSERT INTO t1 VALUES ('trim', '04 function_call_keyword');
+INSERT INTO t1 VALUES ('year', '04 function_call_keyword');
+INSERT INTO t1 VALUES ('create', '05 Reserved keyword');
+CALL p2('SELECT @@$(VAR)');
+--------
+SELECT @@non_keyword; -- Unknown system variable 'non_keyword'
+--------
+SELECT @@lpad; -- Unknown system variable 'lpad'
+--------
+SELECT @@rpad; -- Unknown system variable 'rpad'
+--------
+SELECT @@adddate; -- Unknown system variable 'adddate'
+--------
+SELECT @@substr; -- Unknown system variable 'substr'
+--------
+SELECT @@substring; -- Unknown system variable 'substring'
+--------
+SELECT @@trim_oracle; -- Unknown system variable 'trim_oracle'
+--------
+SELECT @@ascii; -- Unknown system variable 'ascii'
+--------
+SELECT @@replace; -- ..syntax.. near 'replace' at line 1
+--------
+SELECT @@weight_string; -- Unknown system variable 'weight_string'
+--------
+SELECT @@char; -- ..syntax.. near 'char' at line 1
+--------
+SELECT @@trim; -- Unknown system variable 'trim'
+--------
+SELECT @@year; -- Unknown system variable 'year'
+--------
+SELECT @@create; -- ..syntax.. near 'create' at line 1
+CALL p2('SELECT @@global.$(VAR)');
+--------
+SELECT @@global.non_keyword; -- Unknown system variable 'non_keyword'
+--------
+SELECT @@global.lpad; -- Unknown system variable 'lpad'
+--------
+SELECT @@global.rpad; -- Unknown system variable 'rpad'
+--------
+SELECT @@global.adddate; -- Unknown system variable 'adddate'
+--------
+SELECT @@global.substr; -- Unknown system variable 'substr'
+--------
+SELECT @@global.substring; -- Unknown system variable 'substring'
+--------
+SELECT @@global.trim_oracle; -- Unknown system variable 'trim_oracle'
+--------
+SELECT @@global.ascii; -- Unknown system variable 'ascii'
+--------
+SELECT @@global.replace; -- Unknown system variable 'replace'
+--------
+SELECT @@global.weight_string; -- Unknown system variable 'weight_string'
+--------
+SELECT @@global.char; -- Unknown system variable 'char'
+--------
+SELECT @@global.trim; -- Unknown system variable 'trim'
+--------
+SELECT @@global.year; -- Unknown system variable 'year'
+--------
+SELECT @@global.create; -- Unknown system variable 'create'
+CALL p2('SELECT @@global.$(VAR)()');
+--------
+SELECT @@global.non_keyword(); -- Unknown system variable 'non_keyword'
+--------
+SELECT @@global.lpad(); -- Unknown system variable 'lpad'
+--------
+SELECT @@global.rpad(); -- Unknown system variable 'rpad'
+--------
+SELECT @@global.adddate(); -- Unknown system variable 'adddate'
+--------
+SELECT @@global.substr(); -- Unknown system variable 'substr'
+--------
+SELECT @@global.substring(); -- Unknown system variable 'substring'
+--------
+SELECT @@global.trim_oracle(); -- Unknown system variable 'trim_oracle'
+--------
+SELECT @@global.ascii(); -- Unknown system variable 'ascii'
+--------
+SELECT @@global.replace(); -- Unknown system variable 'replace'
+--------
+SELECT @@global.weight_string(); -- Unknown system variable 'weight_string'
+--------
+SELECT @@global.char(); -- Unknown system variable 'char'
+--------
+SELECT @@global.trim(); -- Unknown system variable 'trim'
+--------
+SELECT @@global.year(); -- Unknown system variable 'year'
+--------
+SELECT @@global.create(); -- Unknown system variable 'create'
+CALL p2('SELECT $(VAR)()');
+--------
+SELECT non_keyword(); -- FUNCTION test.non_keyword does not exist
+--------
+SELECT lpad(); -- Incorrect parameter count in the call to
+--------
+SELECT rpad(); -- Incorrect parameter count in the call to
+--------
+SELECT adddate(); -- ..syntax.. near ')' at line 1
+--------
+SELECT substr(); -- ..syntax.. near ')' at line 1
+--------
+SELECT substring(); -- ..syntax.. near ')' at line 1
+--------
+SELECT trim_oracle(); -- ..syntax.. near ')' at line 1
+--------
+SELECT ascii(); -- ..syntax.. near ')' at line 1
+--------
+SELECT replace(); -- ..syntax.. near ')' at line 1
+--------
+SELECT weight_string(); -- ..syntax.. near ')' at line 1
+--------
+SELECT char(); -- ..syntax.. near ')' at line 1
+--------
+SELECT trim(); -- ..syntax.. near ')' at line 1
+--------
+SELECT year(); -- ..syntax.. near ')' at line 1
+--------
+SELECT create(); -- ..syntax.. near 'create()' at line 1
+CALL p2('SELECT test.$(VAR)()');
+--------
+SELECT test.non_keyword(); -- FUNCTION test.non_keyword does not exist
+--------
+SELECT test.lpad(); -- FUNCTION test.lpad does not exist
+--------
+SELECT test.rpad(); -- FUNCTION test.rpad does not exist
+--------
+SELECT test.adddate(); -- FUNCTION test.adddate does not exist. Ch
+--------
+SELECT test.substr(); -- FUNCTION test.substr does not exist. Che
+--------
+SELECT test.substring(); -- FUNCTION test.substring does not exist. 
+--------
+SELECT test.trim_oracle(); -- FUNCTION test.trim_oracle does not exist
+--------
+SELECT test.ascii(); -- FUNCTION test.ascii does not exist. Chec
+--------
+SELECT test.replace(); -- FUNCTION test.replace does not exist. Ch
+--------
+SELECT test.weight_string(); -- FUNCTION test.weight_string does not exi
+--------
+SELECT test.char(); -- FUNCTION test.char does not exist. Check
+--------
+SELECT test.trim(); -- FUNCTION test.trim does not exist. Check
+--------
+SELECT test.year(); -- FUNCTION test.year does not exist. Check
+--------
+SELECT test.create(); -- FUNCTION test.create does not exist. Che
+CALL p2('SELECT $(VAR) FROM t1');
+--------
+SELECT non_keyword FROM t1; -- Unknown column 'non_keyword' in 'field l
+--------
+SELECT lpad FROM t1; -- Unknown column 'lpad' in 'field list'
+--------
+SELECT rpad FROM t1; -- Unknown column 'rpad' in 'field list'
+--------
+SELECT adddate FROM t1; -- Unknown column 'adddate' in 'field list'
+--------
+SELECT substr FROM t1; -- Unknown column 'substr' in 'field list'
+--------
+SELECT substring FROM t1; -- Unknown column 'substring' in 'field lis
+--------
+SELECT trim_oracle FROM t1; -- Unknown column 'trim_oracle' in 'field l
+--------
+SELECT ascii FROM t1; -- Unknown column 'ascii' in 'field list'
+--------
+SELECT replace FROM t1; -- ..syntax.. near 'FROM t1' at line 1
+--------
+SELECT weight_string FROM t1; -- Unknown column 'weight_string' in 'field
+--------
+SELECT char FROM t1; -- ..syntax.. near 'FROM t1' at line 1
+--------
+SELECT trim FROM t1; -- Unknown column 'trim' in 'field list'
+--------
+SELECT year FROM t1; -- Unknown column 'year' in 'field list'
+--------
+SELECT create FROM t1; -- ..syntax.. near 'create FROM t1' at line
+CALL p2('SELECT t1.$(VAR) FROM t1');
+--------
+SELECT t1.non_keyword FROM t1; -- Unknown column 't1.non_keyword' in 'fiel
+--------
+SELECT t1.lpad FROM t1; -- Unknown column 't1.lpad' in 'field list'
+--------
+SELECT t1.rpad FROM t1; -- Unknown column 't1.rpad' in 'field list'
+--------
+SELECT t1.adddate FROM t1; -- Unknown column 't1.adddate' in 'field li
+--------
+SELECT t1.substr FROM t1; -- Unknown column 't1.substr' in 'field lis
+--------
+SELECT t1.substring FROM t1; -- Unknown column 't1.substring' in 'field 
+--------
+SELECT t1.trim_oracle FROM t1; -- Unknown column 't1.trim_oracle' in 'fiel
+--------
+SELECT t1.ascii FROM t1; -- Unknown column 't1.ascii' in 'field list
+--------
+SELECT t1.replace FROM t1; -- Unknown column 't1.replace' in 'field li
+--------
+SELECT t1.weight_string FROM t1; -- Unknown column 't1.weight_string' in 'fi
+--------
+SELECT t1.char FROM t1; -- Unknown column 't1.char' in 'field list'
+--------
+SELECT t1.trim FROM t1; -- Unknown column 't1.trim' in 'field list'
+--------
+SELECT t1.year FROM t1; -- Unknown column 't1.year' in 'field list'
+--------
+SELECT t1.create FROM t1; -- Unknown column 't1.create' in 'field lis
+CALL p2('DROP TABLE $(VAR)');
+--------
+DROP TABLE non_keyword; -- Unknown table 'test.non_keyword'
+--------
+DROP TABLE lpad; -- Unknown table 'test.lpad'
+--------
+DROP TABLE rpad; -- Unknown table 'test.rpad'
+--------
+DROP TABLE adddate; -- Unknown table 'test.adddate'
+--------
+DROP TABLE substr; -- Unknown table 'test.substr'
+--------
+DROP TABLE substring; -- Unknown table 'test.substring'
+--------
+DROP TABLE trim_oracle; -- Unknown table 'test.trim_oracle'
+--------
+DROP TABLE ascii; -- Unknown table 'test.ascii'
+--------
+DROP TABLE replace; -- ..syntax.. near 'replace' at line 1
+--------
+DROP TABLE weight_string; -- Unknown table 'test.weight_string'
+--------
+DROP TABLE char; -- ..syntax.. near 'char' at line 1
+--------
+DROP TABLE trim; -- Unknown table 'test.trim'
+--------
+DROP TABLE year; -- Unknown table 'test.year'
+--------
+DROP TABLE create; -- ..syntax.. near 'create' at line 1
+CALL p2('DROP TABLE test.$(VAR)');
+--------
+DROP TABLE test.non_keyword; -- Unknown table 'test.non_keyword'
+--------
+DROP TABLE test.lpad; -- Unknown table 'test.lpad'
+--------
+DROP TABLE test.rpad; -- Unknown table 'test.rpad'
+--------
+DROP TABLE test.adddate; -- Unknown table 'test.adddate'
+--------
+DROP TABLE test.substr; -- Unknown table 'test.substr'
+--------
+DROP TABLE test.substring; -- Unknown table 'test.substring'
+--------
+DROP TABLE test.trim_oracle; -- Unknown table 'test.trim_oracle'
+--------
+DROP TABLE test.ascii; -- Unknown table 'test.ascii'
+--------
+DROP TABLE test.replace; -- Unknown table 'test.replace'
+--------
+DROP TABLE test.weight_string; -- Unknown table 'test.weight_string'
+--------
+DROP TABLE test.char; -- Unknown table 'test.char'
+--------
+DROP TABLE test.trim; -- Unknown table 'test.trim'
+--------
+DROP TABLE test.year; -- Unknown table 'test.year'
+--------
+DROP TABLE test.create; -- Unknown table 'test.create'
+CALL p2('CREATE FUNCTION $(VAR)() RETURNS OOPS');
+--------
+CREATE FUNCTION non_keyword() RETURNS OOPS; -- Unknown data type: 'OOPS'
+--------
+CREATE FUNCTION lpad() RETURNS OOPS; -- Unknown data type: 'OOPS'
+--------
+CREATE FUNCTION rpad() RETURNS OOPS; -- Unknown data type: 'OOPS'
+--------
+CREATE FUNCTION adddate() RETURNS OOPS; -- Unknown data type: 'OOPS'
+--------
+CREATE FUNCTION substr() RETURNS OOPS; -- ..syntax.. near 'substr() RETURNS OOPS' 
+--------
+CREATE FUNCTION substring() RETURNS OOPS; -- ..syntax.. near 'substring() RETURNS OOP
+--------
+CREATE FUNCTION trim_oracle() RETURNS OOPS; -- Unknown data type: 'OOPS'
+--------
+CREATE FUNCTION ascii() RETURNS OOPS; -- Unknown data type: 'OOPS'
+--------
+CREATE FUNCTION replace() RETURNS OOPS; -- ..syntax.. near 'replace() RETURNS OOPS'
+--------
+CREATE FUNCTION weight_string() RETURNS OOPS; -- Unknown data type: 'OOPS'
+--------
+CREATE FUNCTION char() RETURNS OOPS; -- ..syntax.. near 'char() RETURNS OOPS' at
+--------
+CREATE FUNCTION trim() RETURNS OOPS; -- ..syntax.. near 'trim() RETURNS OOPS' at
+--------
+CREATE FUNCTION year() RETURNS OOPS; -- Unknown data type: 'OOPS'
+--------
+CREATE FUNCTION create() RETURNS OOPS; -- ..syntax.. near 'create() RETURNS OOPS' 
+CALL p2('CREATE FUNCTION test.$(VAR)() RETURNS OOPS');
+--------
+CREATE FUNCTION test.non_keyword() RETURNS OOPS; -- Unknown data type: 'OOPS'
+--------
+CREATE FUNCTION test.lpad() RETURNS OOPS; -- Unknown data type: 'OOPS'
+--------
+CREATE FUNCTION test.rpad() RETURNS OOPS; -- Unknown data type: 'OOPS'
+--------
+CREATE FUNCTION test.adddate() RETURNS OOPS; -- Unknown data type: 'OOPS'
+--------
+CREATE FUNCTION test.substr() RETURNS OOPS; -- Unknown data type: 'OOPS'
+--------
+CREATE FUNCTION test.substring() RETURNS OOPS; -- Unknown data type: 'OOPS'
+--------
+CREATE FUNCTION test.trim_oracle() RETURNS OOPS; -- Unknown data type: 'OOPS'
+--------
+CREATE FUNCTION test.ascii() RETURNS OOPS; -- Unknown data type: 'OOPS'
+--------
+CREATE FUNCTION test.replace() RETURNS OOPS; -- Unknown data type: 'OOPS'
+--------
+CREATE FUNCTION test.weight_string() RETURNS OOPS; -- Unknown data type: 'OOPS'
+--------
+CREATE FUNCTION test.char() RETURNS OOPS; -- Unknown data type: 'OOPS'
+--------
+CREATE FUNCTION test.trim() RETURNS OOPS; -- Unknown data type: 'OOPS'
+--------
+CREATE FUNCTION test.year() RETURNS OOPS; -- Unknown data type: 'OOPS'
+--------
+CREATE FUNCTION test.create() RETURNS OOPS; -- Unknown data type: 'OOPS'
+CALL p2('DROP FUNCTION $(VAR)');
+--------
+DROP FUNCTION non_keyword; -- FUNCTION test.non_keyword does not exist
+--------
+DROP FUNCTION lpad; -- FUNCTION test.lpad does not exist
+--------
+DROP FUNCTION rpad; -- FUNCTION test.rpad does not exist
+--------
+DROP FUNCTION adddate; -- FUNCTION test.adddate does not exist
+--------
+DROP FUNCTION substr; -- FUNCTION test.substr does not exist
+--------
+DROP FUNCTION substring; -- FUNCTION test.substring does not exist
+--------
+DROP FUNCTION trim_oracle; -- FUNCTION test.trim_oracle does not exist
+--------
+DROP FUNCTION ascii; -- FUNCTION test.ascii does not exist
+--------
+DROP FUNCTION replace; -- ..syntax.. near 'replace' at line 1
+--------
+DROP FUNCTION weight_string; -- FUNCTION test.weight_string does not exi
+--------
+DROP FUNCTION char; -- ..syntax.. near 'char' at line 1
+--------
+DROP FUNCTION trim; -- FUNCTION test.trim does not exist
+--------
+DROP FUNCTION year; -- FUNCTION test.year does not exist
+--------
+DROP FUNCTION create; -- ..syntax.. near 'create' at line 1
+CALL p2('DROP FUNCTION test.$(VAR)');
+--------
+DROP FUNCTION test.non_keyword; -- FUNCTION test.non_keyword does not exist
+--------
+DROP FUNCTION test.lpad; -- FUNCTION test.lpad does not exist
+--------
+DROP FUNCTION test.rpad; -- FUNCTION test.rpad does not exist
+--------
+DROP FUNCTION test.adddate; -- FUNCTION test.adddate does not exist
+--------
+DROP FUNCTION test.substr; -- FUNCTION test.substr does not exist
+--------
+DROP FUNCTION test.substring; -- FUNCTION test.substring does not exist
+--------
+DROP FUNCTION test.trim_oracle; -- FUNCTION test.trim_oracle does not exist
+--------
+DROP FUNCTION test.ascii; -- FUNCTION test.ascii does not exist
+--------
+DROP FUNCTION test.replace; -- FUNCTION test.replace does not exist
+--------
+DROP FUNCTION test.weight_string; -- FUNCTION test.weight_string does not exi
+--------
+DROP FUNCTION test.char; -- FUNCTION test.char does not exist
+--------
+DROP FUNCTION test.trim; -- FUNCTION test.trim does not exist
+--------
+DROP FUNCTION test.year; -- FUNCTION test.year does not exist
+--------
+DROP FUNCTION test.create; -- FUNCTION test.create does not exist
+DROP TABLE t1;
+DROP PROCEDURE p1;
+DROP PROCEDURE p2;
diff --git a/mysql-test/main/keywords.test b/mysql-test/main/keywords.test
index a745aada1065f..e6a3fc4953d13 100644
--- a/mysql-test/main/keywords.test
+++ b/mysql-test/main/keywords.test
@@ -295,3 +295,80 @@ BEGIN NOT ATOMIC
 END
 $$
 DELIMITER ;$$
+
+
+--echo #
+--echo # Testing various keywords in various contexts
+--echo #
+
+DELIMITER $$;
+CREATE PROCEDURE p1(query TEXT, var TEXT)
+BEGIN
+  DECLARE errmsg TEXT DEFAULT '';
+  DECLARE CONTINUE HANDLER
+    FOR SQLEXCEPTION
+  BEGIN
+    GET DIAGNOSTICS CONDITION 1 errmsg = MESSAGE_TEXT;
+    SET errmsg= REPLACE(errmsg, 'You have an error in your SQL ', '..');
+    SET errmsg= REPLACE(errmsg, '; check the manual that corresponds to your MariaDB server version for the right syntax to use', '..');
+  END;
+  SET query=REPLACE(query, '$(VAR)', var);
+  EXECUTE IMMEDIATE query;
+  SELECT CONCAT(query, '; -- ', LEFT(COALESCE(errmsg,''),40)) AS `--------`;
+END;
+$$
+CREATE PROCEDURE p2(query TEXT)
+BEGIN
+  FOR row IN (SELECT word FROM t1 ORDER BY category, word)
+  DO
+    CALL p1(query, row.word);
+  END FOR;
+END;
+$$
+DELIMITER ;$$
+
+CREATE TABLE t1 (word TEXT, category TEXT);
+
+INSERT INTO t1 VALUES ('non_keyword', '00 Simple identifier');
+
+INSERT INTO t1 VALUES ('lpad', '01 Built-in native function');
+INSERT INTO t1 VALUES ('rpad', '01 Built-in native function');
+
+INSERT INTO t1 VALUES ('adddate',     '02 function_call_nonkeyword');
+INSERT INTO t1 VALUES ('substr',      '02 function_call_nonkeyword');
+INSERT INTO t1 VALUES ('substring',   '02 function_call_nonkeyword');
+INSERT INTO t1 VALUES ('trim_oracle', '02 function_call_nonkeyword');
+
+INSERT INTO t1 VALUES ('ascii',         '03 function_call_conflict');
+INSERT INTO t1 VALUES ('replace',       '03 function_call_conflict');
+INSERT INTO t1 VALUES ('weight_string', '03 function_call_conflict');
+
+INSERT INTO t1 VALUES ('char', '04 function_call_keyword');
+INSERT INTO t1 VALUES ('trim', '04 function_call_keyword');
+INSERT INTO t1 VALUES ('year', '04 function_call_keyword');
+
+INSERT INTO t1 VALUES ('create', '05 Reserved keyword');
+
+CALL p2('SELECT @@$(VAR)');
+CALL p2('SELECT @@global.$(VAR)');
+CALL p2('SELECT @@global.$(VAR)()');
+
+CALL p2('SELECT $(VAR)()');
+CALL p2('SELECT test.$(VAR)()');
+
+CALL p2('SELECT $(VAR) FROM t1');
+CALL p2('SELECT t1.$(VAR) FROM t1');
+
+CALL p2('DROP TABLE $(VAR)');
+CALL p2('DROP TABLE test.$(VAR)');
+
+CALL p2('CREATE FUNCTION $(VAR)() RETURNS OOPS');
+CALL p2('CREATE FUNCTION test.$(VAR)() RETURNS OOPS');
+
+CALL p2('DROP FUNCTION $(VAR)');
+CALL p2('DROP FUNCTION test.$(VAR)');
+
+DROP TABLE t1;
+
+DROP PROCEDURE p1;
+DROP PROCEDURE p2;
diff --git a/mysql-test/main/thread_pool_info.test b/mysql-test/main/thread_pool_info.test
index cd906454d8c88..84dce94d778e8 100644
--- a/mysql-test/main/thread_pool_info.test
+++ b/mysql-test/main/thread_pool_info.test
@@ -1,4 +1,5 @@
 source include/not_embedded.inc;
+source include/not_aix.inc;
 
 let $have_plugin = `SELECT COUNT(*) FROM INFORMATION_SCHEMA.PLUGINS WHERE PLUGIN_STATUS='ACTIVE' AND PLUGIN_NAME = 'THREAD_POOL_GROUPS'`;
 if(!$have_plugin)
diff --git a/mysql-test/suite/innodb_i_s/innodb_trx.result b/mysql-test/suite/innodb_i_s/innodb_trx.result
index 912ae49b7604d..2c4b9281c9259 100644
--- a/mysql-test/suite/innodb_i_s/innodb_trx.result
+++ b/mysql-test/suite/innodb_i_s/innodb_trx.result
@@ -28,3 +28,21 @@ CREATE TEMPORARY TABLE t1 LIKE INFORMATION_SCHEMA.INNODB_TRX;
 DROP TEMPORARY TABLE t1;
 CREATE TEMPORARY TABLE t1 AS SELECT * FROM INFORMATION_SCHEMA.INNODB_TRX LIMIT 0;
 DROP TEMPORARY TABLE t1;
+#
+# Start of 10.5 tests
+#
+#
+# MDEV-26507 Assertion `tmp != ((long long) 0x8000000000000000LL)' failed in TIME_from_longlong_datetime_packed
+#
+CREATE ALGORITHM=TEMPTABLE VIEW i AS
+SELECT a.trx_started
+FROM INFORMATION_SCHEMA.innodb_lock_waits w
+JOIN INFORMATION_SCHEMA.innodb_trx a
+ORDER BY a.trx_wait_started;
+SET SESSION sql_mode='ALLOW_INVALID_DATES';
+SELECT * FROM i;
+SET SESSION sql_mode=DEFAULT;
+DROP VIEW i;
+#
+# End of 10.5 tests
+#
diff --git a/mysql-test/suite/innodb_i_s/innodb_trx.test b/mysql-test/suite/innodb_i_s/innodb_trx.test
index 90fa3467b50f2..2a66750ed9ffc 100644
--- a/mysql-test/suite/innodb_i_s/innodb_trx.test
+++ b/mysql-test/suite/innodb_i_s/innodb_trx.test
@@ -7,3 +7,28 @@ DROP TEMPORARY TABLE t1;
 
 CREATE TEMPORARY TABLE t1 AS SELECT * FROM INFORMATION_SCHEMA.INNODB_TRX LIMIT 0;
 DROP TEMPORARY TABLE t1;
+
+
+--echo #
+--echo # Start of 10.5 tests
+--echo #
+
+--echo #
+--echo # MDEV-26507 Assertion `tmp != ((long long) 0x8000000000000000LL)' failed in TIME_from_longlong_datetime_packed
+--echo #
+
+CREATE ALGORITHM=TEMPTABLE VIEW i AS
+  SELECT a.trx_started
+  FROM INFORMATION_SCHEMA.innodb_lock_waits w
+  JOIN INFORMATION_SCHEMA.innodb_trx a
+  ORDER BY a.trx_wait_started;
+SET SESSION sql_mode='ALLOW_INVALID_DATES';
+--disable_result_log
+SELECT * FROM i;
+--enable_result_log
+SET SESSION sql_mode=DEFAULT;
+DROP VIEW i;
+
+--echo #
+--echo # End of 10.5 tests
+--echo #
diff --git a/mysql-test/suite/perfschema/r/threads_mysql.result b/mysql-test/suite/perfschema/r/threads_mysql.result
index 40e6360fec7bf..d0748349af371 100644
--- a/mysql-test/suite/perfschema/r/threads_mysql.result
+++ b/mysql-test/suite/perfschema/r/threads_mysql.result
@@ -1,6 +1,6 @@
 SET GLOBAL event_scheduler = OFF;
 SELECT name, type, processlist_user, processlist_host, processlist_db,
-processlist_command, processlist_info,
+processlist_command, processlist_info, connection_type,
 IF(parent_thread_id IS NULL, parent_thread_id, 'unified parent_thread_id')
 AS unified_parent_thread_id,
 role, instrumented
@@ -14,6 +14,7 @@ processlist_host	NULL
 processlist_db	mysql
 processlist_command	NULL
 processlist_info	NULL
+connection_type	NULL
 unified_parent_thread_id	NULL
 role	NULL
 instrumented	YES
@@ -24,6 +25,7 @@ processlist_host	NULL
 processlist_db	NULL
 processlist_command	NULL
 processlist_info	NULL
+connection_type	NULL
 unified_parent_thread_id	unified parent_thread_id
 role	NULL
 instrumented	YES
@@ -34,13 +36,14 @@ processlist_host	localhost
 processlist_db	test
 processlist_command	Query
 processlist_info	SELECT name, type, processlist_user, processlist_host, processlist_db,
-processlist_command, processlist_info,
+processlist_command, processlist_info, connection_type,
 IF(parent_thread_id IS NULL, parent_thread_id, 'unified parent_thread_id')
 AS unified_parent_thread_id,
 role, instrumented
 FROM performance_schema.threads
 WHERE name LIKE 'thread/sql%'
 ORDER BY name
+connection_type	Socket
 unified_parent_thread_id	unified parent_thread_id
 role	NULL
 instrumented	YES
@@ -51,6 +54,7 @@ processlist_host	NULL
 processlist_db	NULL
 processlist_command	NULL
 processlist_info	NULL
+connection_type	NULL
 unified_parent_thread_id	unified parent_thread_id
 role	NULL
 instrumented	YES
diff --git a/mysql-test/suite/perfschema/t/threads_mysql.test b/mysql-test/suite/perfschema/t/threads_mysql.test
index c33f421863e2b..8a021055d4436 100644
--- a/mysql-test/suite/perfschema/t/threads_mysql.test
+++ b/mysql-test/suite/perfschema/t/threads_mysql.test
@@ -32,7 +32,7 @@ SET GLOBAL event_scheduler = OFF;
 #    Therefore we have to disable this protocol for the next statement.
 --disable_ps_protocol
 SELECT name, type, processlist_user, processlist_host, processlist_db,
-       processlist_command, processlist_info,
+       processlist_command, processlist_info, connection_type,
        IF(parent_thread_id IS NULL, parent_thread_id, 'unified parent_thread_id')
          AS unified_parent_thread_id,
        role, instrumented
diff --git a/storage/spider/ha_spider.cc b/storage/spider/ha_spider.cc
index f9ab08924373f..7b9173837c9af 100644
--- a/storage/spider/ha_spider.cc
+++ b/storage/spider/ha_spider.cc
@@ -1182,75 +1182,83 @@ int ha_spider::external_lock(
   int error_num = 0;
   SPIDER_TRX *trx;
   backup_error_status();
+
   DBUG_ENTER("ha_spider::external_lock");
   DBUG_PRINT("info",("spider this=%p", this));
   DBUG_PRINT("info",("spider lock_type=%x", lock_type));
-#if MYSQL_VERSION_ID < 50500
-  DBUG_PRINT("info",("spider thd->options=%x", (int) thd->options));
-#endif
-#ifdef WITH_PARTITION_STORAGE_ENGINE
-  if (
-    wide_handler->stage == SPD_HND_STAGE_EXTERNAL_LOCK &&
-    wide_handler->stage_executor != this)
+  DBUG_PRINT("info", ("spider sql_command=%d", thd_sql_command(thd)));
+
+  if (wide_handler->stage == SPD_HND_STAGE_EXTERNAL_LOCK)
   {
-    DBUG_RETURN(0);
+    /* Only the stage executor deals with table locks. */
+    if (wide_handler->stage_executor != this)
+    {
+      DBUG_RETURN(0);
+    }
+  }
+  else
+  {
+    /* Update the stage executor when the stage changes */
+    wide_handler->stage= SPD_HND_STAGE_EXTERNAL_LOCK;
+    wide_handler->stage_executor= this;
   }
-  wide_handler->stage = SPD_HND_STAGE_EXTERNAL_LOCK;
-  wide_handler->stage_executor = this;
-#endif
-#ifdef HANDLER_HAS_NEED_INFO_FOR_AUTO_INC
-  info_auto_called = FALSE;
-#endif
 
+  info_auto_called = FALSE;
+  wide_handler->external_lock_type= lock_type;
   wide_handler->sql_command = thd_sql_command(thd);
+
+  /* We treat BEGIN as if UNLOCK TABLE. */
   if (wide_handler->sql_command == SQLCOM_BEGIN)
+  {
     wide_handler->sql_command = SQLCOM_UNLOCK_TABLES;
+  }
+  if (lock_type == F_UNLCK &&
+      wide_handler->sql_command != SQLCOM_UNLOCK_TABLES)
+  {
+    DBUG_RETURN(0);
+  }
 
   trx = spider_get_trx(thd, TRUE, &error_num);
   if (error_num)
+  {
     DBUG_RETURN(error_num);
+  }
   wide_handler->trx = trx;
 
-  DBUG_PRINT("info",("spider sql_command=%d", wide_handler->sql_command));
-#ifdef HA_CAN_BULK_ACCESS
-  wide_handler->external_lock_cnt++;
-#endif
-  if (
-    lock_type == F_UNLCK &&
-    wide_handler->sql_command != SQLCOM_UNLOCK_TABLES
-  )
-    DBUG_RETURN(0);
+  /* Question: Why the following if block is necessary? Why here? */
   if (store_error_num)
+  {
     DBUG_RETURN(store_error_num);
-  wide_handler->external_lock_type = lock_type;
-#if defined(HS_HAS_SQLCOM) && defined(HAVE_HANDLERSOCKET)
-  if ((conn_kinds & SPIDER_CONN_KIND_MYSQL))
+  }
+
+  DBUG_ASSERT(wide_handler->sql_command != SQLCOM_RENAME_TABLE &&
+              wide_handler->sql_command != SQLCOM_DROP_DB);
+
+  if (wide_handler->sql_command == SQLCOM_DROP_TABLE ||
+      wide_handler->sql_command == SQLCOM_ALTER_TABLE)
   {
-#endif
-    if (
-      /* SQLCOM_RENAME_TABLE and SQLCOM_DROP_DB don't come here */
-      wide_handler->sql_command == SQLCOM_DROP_TABLE ||
-      wide_handler->sql_command == SQLCOM_ALTER_TABLE
-    ) {
-      if (trx->locked_connections)
-      {
-        my_message(ER_SPIDER_ALTER_BEFORE_UNLOCK_NUM,
-          ER_SPIDER_ALTER_BEFORE_UNLOCK_STR, MYF(0));
-        DBUG_RETURN(ER_SPIDER_ALTER_BEFORE_UNLOCK_NUM);
-      }
-      DBUG_RETURN(0);
+    if (trx->locked_connections)
+    {
+      my_message(ER_SPIDER_ALTER_BEFORE_UNLOCK_NUM,
+                 ER_SPIDER_ALTER_BEFORE_UNLOCK_STR, MYF(0));
+      DBUG_RETURN(ER_SPIDER_ALTER_BEFORE_UNLOCK_NUM);
     }
-    if (unlikely((error_num = spider_internal_start_trx(this))))
+    DBUG_RETURN(0);
+  }
+
+  if (lock_type != F_UNLCK)
+  {
+    if (unlikely((error_num= spider_internal_start_trx(this))))
     {
       DBUG_RETURN(error_num);
     }
-#if defined(HS_HAS_SQLCOM) && defined(HAVE_HANDLERSOCKET)
-  } else {
-    trans_register_ha(trx->thd, FALSE, spider_hton_ptr);
-    if (thd_test_options(trx->thd, OPTION_NOT_AUTOCOMMIT | OPTION_BEGIN))
-      trans_register_ha(trx->thd, TRUE, spider_hton_ptr);
+    if (wide_handler->sql_command != SQLCOM_SELECT &&
+        wide_handler->sql_command != SQLCOM_HA_READ)
+    {
+      trx->updated_in_this_trx= TRUE;
+      DBUG_PRINT("info", ("spider trx->updated_in_this_trx=TRUE"));
+    }
   }
-#endif
 
   if (wide_handler->lock_table_type > 0 ||
     wide_handler->sql_command == SQLCOM_UNLOCK_TABLES)
@@ -1263,12 +1271,10 @@ int ha_spider::external_lock(
     }
 
     /* lock/unlock tables */
-#ifdef WITH_PARTITION_STORAGE_ENGINE
     if (partition_handler && partition_handler->handlers)
     {
-      uint roop_count;
-      for (roop_count = 0; roop_count < partition_handler->no_parts;
-        ++roop_count)
+      for (uint roop_count= 0; roop_count < partition_handler->no_parts;
+           ++roop_count)
       {
         if (unlikely((error_num =
           partition_handler->handlers[roop_count]->lock_tables())))
@@ -1276,54 +1282,13 @@ int ha_spider::external_lock(
           DBUG_RETURN(error_num);
         }
       }
-    } else {
-#endif
-      if (unlikely((error_num = lock_tables())))
-      {
-        DBUG_RETURN(error_num);
-      }
-#ifdef WITH_PARTITION_STORAGE_ENGINE
     }
-#endif
-  }
-
-  DBUG_PRINT("info",("spider trx_start=%s",
-    trx->trx_start ? "TRUE" : "FALSE"));
-  /* need to check after spider_internal_start_trx() */
-  if (trx->trx_start)
-  {
-    switch (wide_handler->sql_command)
+    else if (unlikely((error_num= lock_tables())))
     {
-      case SQLCOM_SELECT:
-      case SQLCOM_HA_READ:
-#ifdef HS_HAS_SQLCOM
-      case SQLCOM_HS_READ:
-#endif
-        /* nothing to do */
-        break;
-      case SQLCOM_UPDATE:
-      case SQLCOM_UPDATE_MULTI:
-#ifdef HS_HAS_SQLCOM
-      case SQLCOM_HS_UPDATE:
-#endif
-      case SQLCOM_CREATE_TABLE:
-      case SQLCOM_INSERT:
-      case SQLCOM_INSERT_SELECT:
-      case SQLCOM_DELETE:
-      case SQLCOM_LOAD:
-      case SQLCOM_REPLACE:
-      case SQLCOM_REPLACE_SELECT:
-      case SQLCOM_DELETE_MULTI:
-#ifdef HS_HAS_SQLCOM
-      case SQLCOM_HS_INSERT:
-      case SQLCOM_HS_DELETE:
-#endif
-      default:
-        trx->updated_in_this_trx = TRUE;
-        DBUG_PRINT("info",("spider trx->updated_in_this_trx=TRUE"));
-        break;
+      DBUG_RETURN(error_num);
     }
   }
+
   DBUG_RETURN(0);
 }
 
diff --git a/storage/spider/mysql-test/spider/bugfix/r/mdev_27239.result b/storage/spider/mysql-test/spider/bugfix/r/mdev_27239.result
new file mode 100644
index 0000000000000..de135972a22a8
--- /dev/null
+++ b/storage/spider/mysql-test/spider/bugfix/r/mdev_27239.result
@@ -0,0 +1,20 @@
+#
+# MDEV-27239 Spider: Assertion `thd->transaction->stmt.ha_list == __null || trans == &thd->transaction->stmt' failed in ha_commit_trans on BEGIN WORK after FTWRL
+#
+for master_1
+for child2
+for child3
+CREATE DATABASE auto_test_local;
+USE auto_test_local;
+CREATE TABLE tbl_a (a INT) ENGINE=SPIDER;
+FLUSH TABLE tbl_a WITH READ LOCK;
+Warnings:
+Error	1429	Unable to connect to foreign data source: localhost
+Error	1429	Unable to connect to foreign data source: localhost
+Error	1429	Unable to connect to foreign data source: localhost
+Error	1429	Unable to connect to foreign data source: localhost
+BEGIN;
+DROP DATABASE auto_test_local;
+for master_1
+for child2
+for child3
diff --git a/storage/spider/mysql-test/spider/bugfix/t/mdev_27239.cnf b/storage/spider/mysql-test/spider/bugfix/t/mdev_27239.cnf
new file mode 100644
index 0000000000000..b0853e32654d9
--- /dev/null
+++ b/storage/spider/mysql-test/spider/bugfix/t/mdev_27239.cnf
@@ -0,0 +1,2 @@
+!include include/default_mysqld.cnf
+!include ../my_1_1.cnf
diff --git a/storage/spider/mysql-test/spider/bugfix/t/mdev_27239.test b/storage/spider/mysql-test/spider/bugfix/t/mdev_27239.test
new file mode 100644
index 0000000000000..3cf4bebd36922
--- /dev/null
+++ b/storage/spider/mysql-test/spider/bugfix/t/mdev_27239.test
@@ -0,0 +1,24 @@
+--echo #
+--echo # MDEV-27239 Spider: Assertion `thd->transaction->stmt.ha_list == __null || trans == &thd->transaction->stmt' failed in ha_commit_trans on BEGIN WORK after FTWRL
+--echo #
+
+--disable_query_log
+--disable_result_log
+--source ../../t/test_init.inc
+--enable_result_log
+--enable_query_log
+
+CREATE DATABASE auto_test_local;
+USE auto_test_local;
+
+CREATE TABLE tbl_a (a INT) ENGINE=SPIDER;
+FLUSH TABLE tbl_a WITH READ LOCK;
+BEGIN;
+
+DROP DATABASE auto_test_local;
+
+--disable_query_log
+--disable_result_log
+--source ../../t/test_deinit.inc
+--enable_result_log
+--enable_query_log
diff --git a/vio/viosocket.c b/vio/viosocket.c
index f63c76c9c7913..002ff274b7495 100644
--- a/vio/viosocket.c
+++ b/vio/viosocket.c
@@ -613,7 +613,7 @@ enum enum_vio_type vio_type(Vio* vio)
 
 static const LEX_CSTRING vio_type_names[] =
 {
-  { STRING_WITH_LEN("Error") }, // cannot happen
+  { STRING_WITH_LEN("") }, // internal threads
   { STRING_WITH_LEN("TCP/IP") },
   { STRING_WITH_LEN("Socket") },
   { STRING_WITH_LEN("Named Pipe") },