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diff --git a/mysql-test/main/backup_syntax.test b/mysql-test/main/backup_syntax.test
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@@ -0,0 +1,181 @@
+########################################################################
+# Tests things related to syntax of BACKUP STAGE (MDEV-5336)
+########################################################################
+
+--source include/have_innodb.inc
+--source include/have_metadata_lock_info.inc
+
+--echo #-----------------------------------------------------------------------
+--echo # Basic syntax checks
+--echo #-----------------------------------------------------------------------
+
+--echo # Check existing BACKUP STAGE statements in the sequence to be used.
+BACKUP STAGE START;
+BACKUP STAGE FLUSH;
+BACKUP STAGE BLOCK_DDL;
+BACKUP STAGE BLOCK_COMMIT;
+BACKUP STAGE END;
+
+--echo # Check invalid variants of BACKUP .... syntax.
+--error ER_PARSE_ERROR
+BACKUP LOG;
+--error ER_PARSE_ERROR
+BACKUP LOCK;
+--error ER_PARSE_ERROR
+BACKUP STAGE;
+--error ER_PARSE_ERROR
+BACKUP STAGE LOCK;
+--error ER_BACKUP_UNKNOWN_STAGE
+BACKUP STAGE not_existing;
+
+--echo #-----------------------------------------------------------------------
+--echo # BACKUP STAGE statements in various orders.
+--echo #-----------------------------------------------------------------------
+--echo # All BACKUP STAGE statements != 'BACKUP STAGE START' expect that a
+--echo # backup lock (generated by BACKUP STAGE START) already exists.
+--echo #
+
+backup stage start;
+backup stage flush;
+--error ER_BACKUP_WRONG_STAGE
+backup stage start;
+--error ER_BACKUP_WRONG_STAGE
+backup stage start;
+backup stage block_commit;
+--error ER_BACKUP_WRONG_STAGE
+backup stage flush;
+--error ER_BACKUP_WRONG_STAGE
+backup stage flush;
+backup stage end;
+--error ER_BACKUP_NOT_RUNNING
+backup stage flush;
+--error ER_BACKUP_NOT_RUNNING
+BACKUP STAGE END;
+--error ER_BACKUP_NOT_RUNNING
+BACKUP STAGE BLOCK_COMMIT;
+--error ER_BACKUP_NOT_RUNNING
+BACKUP STAGE BLOCK_DDL;
+--error ER_BACKUP_NOT_RUNNING
+BACKUP STAGE FLUSH;
+
+--echo # Ordered "give up" with 'BACKUP STAGE END' because of whatever reason.
+--echo # Some existing backup lock assumed a 'BACKUP STAGE END' is allowed in
+--echo # every situation.
+
+BACKUP STAGE START;
+BACKUP STAGE END;
+--echo #----
+BACKUP STAGE START;
+BACKUP STAGE FLUSH;
+BACKUP STAGE END;
+--echo #----
+BACKUP STAGE START;
+BACKUP STAGE FLUSH;
+BACKUP STAGE BLOCK_DDL;
+BACKUP STAGE END;
+--echo # Orders with BACKUP STAGE FLUSH omitted.
+BACKUP STAGE START;
+BACKUP STAGE BLOCK_DDL;
+BACKUP STAGE END;
+--echo #----
+BACKUP STAGE START;
+BACKUP STAGE BLOCK_DDL;
+BACKUP STAGE BLOCK_COMMIT;
+BACKUP STAGE END;
+--echo # Orders with BACKUP STAGE BLOCK_DDL omitted.
+BACKUP STAGE START;
+BACKUP STAGE FLUSH;
+BACKUP STAGE BLOCK_COMMIT;
+BACKUP STAGE END;
+--echo # Orders with BACKUP STAGE BLOCK_COMMIT omitted.
+BACKUP STAGE START;
+BACKUP STAGE FLUSH;
+BACKUP STAGE BLOCK_DDL;
+BACKUP STAGE END;
+
+--echo # Orders with doubled BACKUP STAGE statements.
+--echo # We get an error but that seems to have no bad impact on the state.
+--echo # And so we are allowed to go on with BACKUP STAGE statements.
+
+BACKUP STAGE START;
+--error ER_BACKUP_WRONG_STAGE
+BACKUP STAGE START;
+BACKUP STAGE FLUSH;
+BACKUP STAGE BLOCK_DDL;
+BACKUP STAGE BLOCK_COMMIT;
+BACKUP STAGE END;
+--echo #----
+BACKUP STAGE START;
+BACKUP STAGE FLUSH;
+--error ER_BACKUP_WRONG_STAGE
+BACKUP STAGE FLUSH;
+BACKUP STAGE END;
+--echo #----
+BACKUP STAGE START;
+BACKUP STAGE FLUSH;
+BACKUP STAGE BLOCK_DDL;
+--error ER_BACKUP_WRONG_STAGE
+BACKUP STAGE BLOCK_DDL;
+BACKUP STAGE END;
+--echo #----
+BACKUP STAGE START;
+BACKUP STAGE FLUSH;
+BACKUP STAGE BLOCK_DDL;
+BACKUP STAGE BLOCK_COMMIT;
+--error ER_BACKUP_WRONG_STAGE
+BACKUP STAGE BLOCK_COMMIT;
+BACKUP STAGE END;
+
+--echo # Scrambled orders.
+BACKUP STAGE START;
+BACKUP STAGE FLUSH;
+--error ER_BACKUP_WRONG_STAGE
+BACKUP STAGE START;
+BACKUP STAGE BLOCK_DDL;
+--error ER_BACKUP_WRONG_STAGE
+BACKUP STAGE START;
+BACKUP STAGE BLOCK_COMMIT;
+--error ER_BACKUP_WRONG_STAGE
+BACKUP STAGE START;
+BACKUP STAGE END;
+--echo #----
+BACKUP STAGE START;
+BACKUP STAGE FLUSH;
+BACKUP STAGE BLOCK_DDL;
+--error ER_BACKUP_WRONG_STAGE
+BACKUP STAGE FLUSH;
+BACKUP STAGE BLOCK_COMMIT;
+--error ER_BACKUP_WRONG_STAGE
+BACKUP STAGE FLUSH;
+BACKUP STAGE END;
+--echo #----
+BACKUP STAGE START;
+BACKUP STAGE FLUSH;
+BACKUP STAGE BLOCK_DDL;
+BACKUP STAGE BLOCK_COMMIT;
+--error ER_BACKUP_WRONG_STAGE
+BACKUP STAGE BLOCK_DDL;
+BACKUP STAGE END;
+--echo #----
+BACKUP STAGE START;
+BACKUP STAGE BLOCK_DDL;
+--error ER_BACKUP_WRONG_STAGE
+BACKUP STAGE FLUSH;
+BACKUP STAGE BLOCK_COMMIT;
+BACKUP STAGE END;
+--echo #----
+BACKUP STAGE START;
+BACKUP STAGE FLUSH;
+BACKUP STAGE BLOCK_COMMIT;
+--error ER_BACKUP_WRONG_STAGE
+BACKUP STAGE BLOCK_DDL;
+BACKUP STAGE END;
+
+--echo #
+--echo # Check Oracle syntax
+--echo #
+
+set SQL_MODE=Oracle;
+backup stage start;
+backup stage end;
+set SQL_MODE=default;