BUG#25463 (Memory allocation problems in replication slave thread):

The problem is (most probably) caused by whole server shutting down before a 
slave thread terminates correctly. Fixing this requires fixing server shutdown
code which has been done in 5.1 tree. Thus we ignore the issue in 5.0 assuming 
that it is fixed in 5.1.  

mysql-test/valgrind.supp

@@ -346,3 +346,20 @@
    fun:_ZN19TransporterRegistry11performSendEv
    fun:_ZN19TransporterRegistry14forceSendCheckEi
 }
+
+#
+# BUG#25463: Probable cause - slave thread doesn't have time to terminate properly
+# because rest of the server shuts down before that. The server shutdown code has
+# been fixed in 5.1 and there this leak should not happen. Suppression has been 
+# approved by Monty.
+#
+# Important: do not propagate this rule to 5.1 tree!
+#
+
+{
+   Slave thread shutdown (BUG#25463)
+   Memcheck:Leak
+   fun:calloc
+   fun:my_thread_init
+   fun:handle_slave_io
+}