MDEV-17948 Assertion `thd_killed(thd) || !m_active_tranxs ..

Simulation of a big-sized event in rpl.rpl_semi_sync_skip_repl did not clean
up after itself so screw the last binlog event offset which could jump
backwards.
The test is refined to rotate a binlog file with simulation and use the next
one for logics of the test incl master-slave synchonization.

mysql-test/suite/rpl/r/rpl_semi_sync_skip_repl.result

@@ -5,19 +5,22 @@ SET @@GLOBAL.rpl_semi_sync_master_enabled = 1;
 SET @@GLOBAL.rpl_semi_sync_master_timeout=100;
 include/stop_slave.inc
 SET @@GLOBAL.replicate_events_marked_for_skip=FILTER_ON_MASTER;
-SET @@GLOBAL. rpl_semi_sync_slave_enabled = 1;
+SET @@GLOBAL.rpl_semi_sync_slave_enabled = 1;
 include/start_slave.inc
 CREATE TABLE t1 (a INT) ENGINE=innodb;
-SET @@GLOBAL.debug_dbug= "d,dbug_master_binlog_over_2GB";
+SET @@GLOBAL.debug_dbug="d,dbug_master_binlog_over_2GB";
 SET @@SESSION.skip_replication=1;
 INSERT INTO t1 SET a=1;
 SET @@SESSION.skip_replication=0;
 INSERT INTO t1 SET a=0;
 SET @@GLOBAL.debug_dbug="";
-SET @@GLOBAL. rpl_semi_sync_master_timeout = 10000;
-SET @@GLOBAL. rpl_semi_sync_master_enabled = 0;
+FLUSH LOGS;
+SET @@GLOBAL.debug_dbug=@@GLOBAL.debug_dbug;
+SET @@GLOBAL.rpl_semi_sync_master_timeout = 10000;
+SET @@GLOBAL.rpl_semi_sync_master_enabled = 0;
 DROP TABLE t1;
 include/stop_slave.inc
-SET @@GLOBAL. rpl_semi_sync_slave_enabled = 0;
+SET @@GLOBAL.rpl_semi_sync_slave_enabled = 0;
 SET @@GLOBAL.replicate_events_marked_for_skip = REPLICATE;
+include/start_slave.inc
 include/rpl_end.inc

mysql-test/suite/rpl/t/rpl_semi_sync_skip_repl.test

@@ -16,29 +16,34 @@ source include/master-slave.inc;
 # Suppress warnings that might be generated during the test
 call mtr.add_suppression("Timeout waiting for reply of binlog");
 
---let $sav_enabled_master=`SELECT @@GLOBAL.rpl_semi_sync_master_enabled `
---let $sav_timeout_master=`SELECT @@GLOBAL.rpl_semi_sync_master_timeout `
+--let $sav_enabled_master=`SELECT @@GLOBAL.rpl_semi_sync_master_enabled`
+--let $sav_timeout_master=`SELECT @@GLOBAL.rpl_semi_sync_master_timeout`
 SET @@GLOBAL.rpl_semi_sync_master_enabled = 1;
 SET @@GLOBAL.rpl_semi_sync_master_timeout=100;
 
 --connection slave
+--let $sav_skip_marked_slave=`SELECT @@GLOBAL.replicate_events_marked_for_skip`
+--let $sav_enabled_slave=`SELECT @@GLOBAL.rpl_semi_sync_slave_enabled`
 source include/stop_slave.inc;
---let $sav_skip_marked_slave=`SELECT @@GLOBAL.replicate_events_marked_for_skip `
 SET @@GLOBAL.replicate_events_marked_for_skip=FILTER_ON_MASTER;
---let $sav_enabled_slave=`SELECT @@GLOBAL.rpl_semi_sync_slave_enabled `
-SET @@GLOBAL. rpl_semi_sync_slave_enabled = 1;
-
+SET @@GLOBAL.rpl_semi_sync_slave_enabled = 1;
 source include/start_slave.inc;
 
 --connection master
 CREATE TABLE t1 (a INT) ENGINE=innodb;
 
 # Make the following events as if they offset over 2GB from the beginning of binlog
-SET @@GLOBAL.debug_dbug= "d,dbug_master_binlog_over_2GB";
+--let $sav_debug_dbug=@@GLOBAL.debug_dbug
+SET @@GLOBAL.debug_dbug="d,dbug_master_binlog_over_2GB";
 SET @@SESSION.skip_replication=1;
 INSERT INTO t1 SET a=1;
 SET @@SESSION.skip_replication=0;
 INSERT INTO t1 SET a=0;
+SET @@GLOBAL.debug_dbug="";
+
+# The current binlog is inconsistent so let's rotate it away
+# to clean up simulation results.
+FLUSH LOGS;
 
 --sync_slave_with_master
 
@@ -46,17 +51,17 @@ INSERT INTO t1 SET a=0;
 # Clean up
 #
 --connection master
-SET @@GLOBAL.debug_dbug="";
---eval SET @@GLOBAL. rpl_semi_sync_master_timeout = $sav_timeout_master
---eval SET @@GLOBAL. rpl_semi_sync_master_enabled = $sav_enabled_master
+--eval SET @@GLOBAL.debug_dbug=$sav_debug_dbug
+--eval SET @@GLOBAL.rpl_semi_sync_master_timeout = $sav_timeout_master
+--eval SET @@GLOBAL.rpl_semi_sync_master_enabled = $sav_enabled_master
 
 --connection master
 DROP TABLE t1;
 
 --sync_slave_with_master
 source include/stop_slave.inc;
---eval SET @@GLOBAL. rpl_semi_sync_slave_enabled = $sav_enabled_slave
+--eval SET @@GLOBAL.rpl_semi_sync_slave_enabled = $sav_enabled_slave
 --eval SET @@GLOBAL.replicate_events_marked_for_skip = $sav_skip_marked_slave
 
---let $rpl_only_running_threads= 1
+source include/start_slave.inc;
 --source include/rpl_end.inc