When we delete the slave's temp tables from memory, we reset

rli->save_temporary_tables and slave_open_temp_tables
(in old 4.0 you could make "SHOW STATUS LIKE 'slave_open_temp_tables'" grow
indefinitely by doing RESET SLAVE and replicating always the same CREATE
TEMPORARY TABLE).
It's critical to reset save_temporary_tables to 0 (otherwise you may later
read memory which has been freed) so this changeset should go into 4.1.

mysql-test/r/rpl_reset_slave.result

@@ -20,3 +20,13 @@ start slave;
 show slave status;
 Master_Host	Master_User	Master_Port	Connect_retry	Master_Log_File	Read_Master_Log_Pos	Relay_Log_File	Relay_Log_Pos	Relay_Master_Log_File	Slave_IO_Running	Slave_SQL_Running	Replicate_do_db	Replicate_ignore_db	Last_errno	Last_error	Skip_counter	Exec_master_log_pos	Relay_log_space
 127.0.0.1	root	MASTER_PORT	1	master-bin.001	79	slave-relay-bin.002	120	master-bin.001	Yes	Yes			0		0	79	120
+stop slave;
+reset slave;
+start slave;
+create temporary table t1 (a int);
+stop slave;
+reset slave;
+start slave;
+show status like 'slave_open_temp_tables';
+Variable_name	Value
+Slave_open_temp_tables	1

mysql-test/t/rpl_reset_slave.test

@@ -2,6 +2,8 @@
 # --master-* options from mysqld, as this is what is going to be used next time
 # slave threads will be started). In bug 985, it displayed old values (of before
 # RESET SLAVE).
+# See if slave crashes when doing a CREATE TEMPORARY TABLE twice, separated by
+# RESET SLAVE.
 
 source include/master-slave.inc;
 connection master;
@@ -24,3 +26,19 @@ start slave;
 sync_with_master;
 --replace_result $MASTER_MYPORT MASTER_PORT
 show slave status;
+
+# test of crash with temp tables & RESET SLAVE
+# (test to see if RESET SLAVE clears temp tables in memory and disk)
+stop slave;
+reset slave;
+start slave;
+connection master;
+create temporary table t1 (a int);
+save_master_pos;
+connection slave;
+sync_with_master;
+stop slave;
+reset slave;
+start slave;
+sync_with_master;
+show status like 'slave_open_temp_tables';

sql/slave.cc

@@ -337,6 +337,8 @@ void st_relay_log_info::close_temporary_tables()
     */
     close_temporary(table, 0);
   }
+  save_temporary_tables= 0;
+  slave_open_temp_tables= 0;
 }
 
 /*