LP #1334570: Valgrind: memory leak in scalability_metrics

**Reported in Launchpad by Laurynas Biveinis last update 15-09-2014 09:26:35

./mysql-test-run scalability_metrics

main.scalability_metrics [ pass ] 899
worker[1] Valgrind report from /home/laurynas/percona/lp-mysql-server/valgrind-fixes-5.5/obj-valgrind/mysql-test/var/log/mysqld.1.err after tests:
main.scalability_metrics
--------------------------------------------------------------------------
HEAP SUMMARY:
in use at exit: 30,570,392 bytes in 215 blocks
total heap usage: 61,713 allocs, 61,498 frees, 90,904,355 bytes allocated

32 bytes in 1 blocks are definitely lost in loss record 30 of 100
at 0x4C2CC70: calloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
by 0x1202F43A: ???
by 0x1202F877: ???
by 0x1202FC88: ???
by 0x6ED1E3: plugins_dispatch(THD*, st_plugin_int*, void) (sql_audit.cc:457)
by 0x6ED28A: event_class_dispatch(THD*, unsigned int, void const*) (sql_audit.cc:493)
by 0x6EC352: general_class_handler(THD*, unsigned int, __va_list_tag*) (sql_audit.cc:90)
by 0x6ECC92: mysql_audit_notify(THD*, unsigned int, unsigned int, ...) (sql_audit.cc:215)
by 0x5F65CF: mysql_audit_general(THD*, unsigned int, int, char const*) (sql_audit.h:177)
by 0x5F9DD6: dispatch_command(enum_server_command, THD*, char*, unsigned int) (sql_parse.cc:1467)
by 0x5F7CC0: do_command(THD*) (sql_parse.cc:789)
by 0x6F0C0D: do_handle_one_connection(THD*) (sql_connect.cc:1409)
by 0x6F073C: handle_one_connection (sql_connect.cc:1324)
by 0x9BBB8F: pfs_spawn_thread (pfs.cc:1015)
by 0x525A181: start_thread (pthread_create.c:312)
by 0x5FB230C: clone (clone.S:111)

64 bytes in 2 blocks are definitely lost in loss record 61 of 100
at 0x4C2CC70: calloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
by 0x1202F43A: ???
by 0x1202FCEF: ???
by 0x6ED1E3: plugins_dispatch(THD*, st_plugin_int*, void) (sql_audit.cc:457)
by 0x6ED28A: event_class_dispatch(THD*, unsigned int, void const*) (sql_audit.cc:493)
by 0x6EC9A4: connection_class_handler(THD*, unsigned int, __va_list_tag*) (sql_audit.cc:114)
by 0x6ECC92: mysql_audit_notify(THD*, unsigned int, unsigned int, ...) (sql_audit.cc:215)
by 0x6F09DF: thd_prepare_connection(THD*) (sql_connect.cc:1333)
by 0x6F0BE4: do_handle_one_connection(THD*) (sql_connect.cc:1399)
by 0x6F073C: handle_one_connection (sql_connect.cc:1324)
by 0x9BBB8F: pfs_spawn_thread (pfs.cc:1015)
by 0x525A181: start_thread (pthread_create.c:312)
by 0x5FB230C: clone (clone.S:111)

plugins_dispatch is the last function in the server code, ??? and ??? are likely to be in plugin. There is a single calloc site in the plugin source, sm_thd_data_get.