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############################################################################### # Bug#21179199 ZOMBIE DUMP THREADS ARE NOT DISCONNECTED, # CAN ALSO LEAD TO A CRASH # # Problem: Zombie dump threads on Master (>= MySQL-5.6 version) # that are created to server slaves which are on lower # versions than MySQL-5.6 version are not getting killed. # Steps to reproduce: # # 1) A simulation point on slave to fake that server MySQL version is lower # than MySQL-5.6 (i.e., no slave_uuid set in initial replication protocol) # # 2) Start IO thread on Slave which will start a dump thread on Master. # # 3) Restart the IO thread (Master should kill existing dump thread before # starting a new dump thread) # # 4) Now count the number of dump threads on Master, it should be only '1'. # ############################################################################### --source include/have_debug.inc --source include/have_binlog_format_statement.inc --let rpl_skip_start_slave= 1 --source include/master-slave.inc # When this test script is running in combination with other tests, # it is possible that dump threads from those tests are not killed. # (rpl_end.inc does not kill dump threads). # Hence doing the cleanup here as this test depends on counting the # active dump threads. --source include/stop_dump_threads.inc # Step-1) A simulation point on slave to fake that server MySQL version # is lower than MySQL-5.6 (i.e., no slave_uuid set in initial replication # protocol). --source include/rpl_connection_slave.inc SET @save_debug = @@GLOBAL.debug; SET GLOBAL debug="d,fake_5_5_version_slave"; # Step-2) Start IO thread on Slave which will start a dump thread on Master. --source include/start_slave_io.inc # Step-3) Restart the IO thread (Master should kill existing dump thread before # starting a new dump thread) --source include/stop_slave_io.inc --source include/start_slave_io.inc # Step-4) Count the number of dump threads on Master, it should be eventually # become '1'. --source include/rpl_connection_master.inc --let $wait_condition= SELECT COUNT(*) = 1 FROM information_schema.processlist WHERE COMMAND LIKE 'Binlog Dump%' --source include/wait_condition.inc # Cleanup --source include/rpl_connection_slave.inc SET GLOBAL debug=@save_debug; # We do not care about SQL thread for this test scenario --let $rpl_only_running_threads= 1 --source include/rpl_end.inc