main.group_min_max fails in buildbot with valgrind

main.group_min_max                       w1 [ fail ]  Found warnings/errors in server log file!

        Test ended at 2015-04-04 07:38:32

line

==25800== Thread 5:

==25800== Invalid read of size 4

==25800==    at 0x7B3383: Field_newdate::cmp(unsigned char const*, unsigned char const*) (field.cc:6000)

==25800==    by 0x8B38A9: key_cmp(st_key_part_info*, unsigned char const*, unsigned int) (key.cc:526)

==25800==    by 0x9014B6: QUICK_GROUP_MIN_MAX_SELECT::next_max_in_range() (opt_range.cc:14934)

==25800==    by 0x901907: QUICK_GROUP_MIN_MAX_SELECT::next_max() (opt_range.cc:14575)

==25800==    by 0x907671: QUICK_GROUP_MIN_MAX_SELECT::get_next() (opt_range.cc:14433)

==25800==    by 0x927808: rr_quick(READ_RECORD*) (records.cc:346)

==25800==    by 0x635A72: sub_select(JOIN*, st_join_table*, bool) (sql_select.cc:17891)

==25800==    by 0x65FF1C: do_select(JOIN*, List<Item>*, TABLE*, Procedure*) (sql_select.cc:17551)

==25800==    by 0x6614F5: JOIN::exec_inner() (sql_select.cc:3094)

==25800==    by 0x663432: JOIN::exec() (sql_select.cc:2394)

==25800==    by 0x66377F: mysql_select(THD*, Item***, TABLE_LIST*, unsigned int, List<Item>&, Item*, unsigned int, st_order*, st_order*, Item*, st_order*, unsigned long long, select_result*, st_select_lex_unit*, st_select_lex*) (sql_select.cc:3322)

==25800==    by 0x664593: handle_select(THD*, LEX*, select_result*, unsigned long) (sql_select.cc:373)

==25800==    by 0x5F746C: execute_sqlcom_select(THD*, TABLE_LIST*) (sql_parse.cc:5782)

==25800==    by 0x5FCE0B: mysql_execute_command(THD*) (sql_parse.cc:2926)

==25800==    by 0x603E69: mysql_parse(THD*, char*, unsigned int, Parser_state*) (sql_parse.cc:7165)

==25800==    by 0x607091: dispatch_command(enum_server_command, THD*, char*, unsigned int) (sql_parse.cc:1462)

==25800==  Address 0xaba853d is 13 bytes inside a block of size 16 alloc'd

==25800==    at 0x4C25DD6: malloc (vg_replace_malloc.c:270)

==25800==    by 0xE52DEA: my_malloc (my_malloc.c:100)

==25800==    by 0x901460: QUICK_GROUP_MIN_MAX_SELECT::next_max_in_range() (opt_range.cc:14928)

==25800==    by 0x901907: QUICK_GROUP_MIN_MAX_SELECT::next_max() (opt_range.cc:14575)

==25800==    by 0x907671: QUICK_GROUP_MIN_MAX_SELECT::get_next() (opt_range.cc:14433)

==25800==    by 0x927808: rr_quick(READ_RECORD*) (records.cc:346)

==25800==    by 0x635A72: sub_select(JOIN*, st_join_table*, bool) (sql_select.cc:17891)

==25800==    by 0x65FF1C: do_select(JOIN*, List<Item>*, TABLE*, Procedure*) (sql_select.cc:17551)

==25800==    by 0x6614F5: JOIN::exec_inner() (sql_select.cc:3094)

==25800==    by 0x663432: JOIN::exec() (sql_select.cc:2394)

==25800==    by 0x66377F: mysql_select(THD*, Item***, TABLE_LIST*, unsigned int, List<Item>&, Item*, unsigned int, st_order*, st_order*, Item*, st_order*, unsigned long long, select_result*, st_select_lex_unit*, st_select_lex*) (sql_select.cc:3322)

==25800==    by 0x664593: handle_select(THD*, LEX*, select_result*, unsigned long) (sql_select.cc:373)

==25800==    by 0x5F746C: execute_sqlcom_select(THD*, TABLE_LIST*) (sql_parse.cc:5782)

==25800==    by 0x5FCE0B: mysql_execute_command(THD*) (sql_parse.cc:2926)

==25800==    by 0x603E69: mysql_parse(THD*, char*, unsigned int, Parser_state*) (sql_parse.cc:7165)

==25800==    by 0x607091: dispatch_command(enum_server_command, THD*, char*, unsigned int) (sql_parse.cc:1462)

^ Found warnings in /dev/shm/var_auto_Axsl/1/log/mysqld.1.err

ok