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# ==== Purpose ==== # # Test verifies that there is no deadlock when following commands are executed # in parallel. # # SHOW BINARY LOGS # # SELECT * FROM performance_schema.session_variables WHERE VARIABLE_NAME LIKE # 'binlog_transaction_dependency_tracking' # # PURGE BINARY LOGS BEFORE $date; # # ==== Implementation ==== # # With the help of DEBUG_SYNC operations simulate the deadlock environment. # # 1) PURGE LOGS BEFORE date # Owns: MYSQL_BIN_LOG::LOCK_index # Waits for: THD::LOCK_thd_data # # 2) select query on performance_schema.session_variables table # Owns: THD::LOCK_thd_data # Waits for: MYSQL_BIN_LOG::LOCK_log # # 3) SHOW BINARY LOGS # Owns: MYSQL_BIN_LOG::LOCK_log # Waits for: MYSQL_BIN_LOG::LOCK_index # # ==== References ==== # # Bug#28511326: DEADLOCK DURING PURGE_LOGS_BEFORE_DATE --source include/have_debug_sync.inc --source include/have_log_bin.inc --source include/have_perfschema.inc --echo # --echo # Bug 92108: Deadlock by concurrent SHOW BINLOGS, --echo # performance_schema.session_variables query, and binlog purge --echo # RESET MASTER; FLUSH LOGS; --enable_connect_log --connect(con1,localhost,root,,) SET DEBUG_SYNC="purge_logs_after_lock_index_before_thread_count SIGNAL purge_ready WAIT_FOR finish_purge"; --send PURGE BINARY LOGS BEFORE '2038-01-19' --connect(con2,localhost,root,,) SET DEBUG_SYNC="materialize_session_variable_array_THD_locked SIGNAL pfs_ready WAIT_FOR finish_pfs"; --send SELECT * FROM performance_schema.session_variables WHERE VARIABLE_NAME LIKE 'binlog_transaction_dependency_tracking'; --connect(con3,localhost,root,,) SET DEBUG_SYNC="show_binlogs_after_lock_log_before_lock_index SIGNAL show_ready WAIT_FOR finish_show"; --send SHOW BINARY LOGS --connection default SET DEBUG_SYNC="now WAIT_FOR purge_ready"; SET DEBUG_SYNC="now WAIT_FOR pfs_ready"; SET DEBUG_SYNC="now WAIT_FOR show_ready"; SET DEBUG_SYNC="now SIGNAL finish_purge"; SET DEBUG_SYNC="now SIGNAL finish_pfs"; SET DEBUG_SYNC="now SIGNAL finish_show"; --connection con1 replace_regex /\.[\\\/]master/master/; reap; --disconnect con1 --connection con2 reap; --disconnect con2 --connection con3 --disable_result_log reap; --enable_result_log --disconnect con3 --connection default SET DEBUG_SYNC= 'RESET'; --disable_connect_log