B4BY.588
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# -- Bug#20201006: Spamming show processlist prevents old connection # -- threads from cleaning up. SET @saved_max_connections = @@global.max_connections; SET GLOBAL max_connections = 2; # -- Check that we allow only max_connections + 1 connections here connect con_1, localhost, root; connect con_2, localhost, root; connect(localhost,root,,test,MYSQL_PORT,MYSQL_SOCK); connect con_3, localhost, root; ERROR HY000: Too many connections # -- Ensure we have max_connections + 1 connections. SELECT count(*)= @@global.max_connections + 1 FROM information_schema.processlist; count(*)= @@global.max_connections + 1 1 # -- Take LOCK_thd_remove and close one connection then # attempt new one [should fail]... SET DEBUG_SYNC='fill_schema_processlist_after_copying_threads SIGNAL disconnect_connection WAIT_FOR continue'; SELECT user FROM INFORMATION_SCHEMA.PROCESSLIST GROUP BY user;; connection default; SET DEBUG_SYNC='now WAIT_FOR disconnect_connection'; disconnect con_1; connect(localhost,root,,test,MYSQL_PORT,MYSQL_SOCK); connect con_3, localhost, root; ERROR HY000: Too many connections # -- Release the lock. Now new connection should go through SET DEBUG_SYNC='now SIGNAL continue'; connection con_2; user root SET DEBUG_SYNC='RESET'; # -- Waiting for connection to close... connect con_3, localhost, root; # -- Closing connections... disconnect con_3; disconnect con_2; connection default; # -- Resetting variables... SET GLOBAL max_connections= @saved_max_connections; # -- End of Bug#20201006.