spider tests failed in buildbot with valgrind

spider.spider_fixes_part                 w2 [ fail ]  Found warnings/errors in server log file!

        Test ended at 2017-05-14 13:23:23

line

==15440== Thread 25:

==15440== Invalid read of size 8

==15440==    at 0x5E0BC6: thd_increment_bytes_sent (sql_class.cc:4054)

==15440==    by 0x55B5E6: net_real_write (net_serv.cc:710)

==15440==    by 0x55AAE3: net_flush (net_serv.cc:363)

==15440==    by 0x55AEFE: net_write_command (net_serv.cc:501)

==15440==    by 0x82A82E: cli_advanced_command (client.c:701)

==15440==    by 0x831950: mysql_close_slow_part (client.c:3949)

==15440==    by 0x8319C5: mysql_close (client.c:3961)

==15440==    by 0x1375115F: spider_db_mysql::disconnect() (spd_db_mysql.cc:1644)

==15440==    by 0x136A798D: spider_db_disconnect(st_spider_conn*) (spd_db_conn.cc:275)

==15440==    by 0x136C96AE: spider_free_conn_alloc(st_spider_conn*) (spd_conn.cc:156)

==15440==    by 0x136CB6D0: spider_free_conn(st_spider_conn*) (spd_conn.cc:1112)

==15440==    by 0x136C9B7E: spider_free_conn_from_trx(st_spider_transaction*, st_spider_conn*, bool, bool, int*) (spd_conn.cc:268)

==15440==  Address 0x13b6e6e0 is 4,352 bytes inside a block of size 21,912 free'd

==15440==    at 0x4C291ED: free (vg_replace_malloc.c:530)

==15440==    by 0xF18DB2: my_free (my_malloc.c:217)

==15440==    by 0x558D63: ilink::operator delete(void*, unsigned long) (sql_list.h:638)

==15440==    by 0x5DA2D2: THD::~THD() (sql_class.cc:1707)

==15440==    by 0x136D131F: spider_bg_sts_action(void*) (spd_conn.cc:2893)

==15440==    by 0x4E3C0DA: start_thread (in /lib64/libpthread-2.18.so)

==15440==    by 0x6B28E3C: clone (in /lib64/libc-2.18.so)

==15440==  Block was alloc'd at

==15440==    at 0x4C280F3: malloc (vg_replace_malloc.c:299)

==15440==    by 0xF188C6: my_malloc (my_malloc.c:101)

==15440==    by 0x136A631A: ilink::operator new(unsigned long) (sql_list.h:634)

==15440==    by 0x136D0B5C: spider_bg_sts_action(void*) (spd_conn.cc:2773)

==15440==    by 0x4E3C0DA: start_thread (in /lib64/libpthread-2.18.so)

==15440==    by 0x6B28E3C: clone (in /lib64/libc-2.18.so)

==15440== Invalid write of size 8

==15440==    at 0x5E0BD8: thd_increment_bytes_sent (sql_class.cc:4054)

==15440==    by 0x55B5E6: net_real_write (net_serv.cc:710)

==15440==    by 0x55AAE3: net_flush (net_serv.cc:363)

==15440==    by 0x55AEFE: net_write_command (net_serv.cc:501)

==15440==    by 0x82A82E: cli_advanced_command (client.c:701)

==15440==    by 0x831950: mysql_close_slow_part (client.c:3949)

==15440==    by 0x8319C5: mysql_close (client.c:3961)

==15440==    by 0x1375115F: spider_db_mysql::disconnect() (spd_db_mysql.cc:1644)

==15440==    by 0x136A798D: spider_db_disconnect(st_spider_conn*) (spd_db_conn.cc:275)

==15440==    by 0x136C96AE: spider_free_conn_alloc(st_spider_conn*) (spd_conn.cc:156)

==15440==    by 0x136CB6D0: spider_free_conn(st_spider_conn*) (spd_conn.cc:1112)

==15440==    by 0x136C9B7E: spider_free_conn_from_trx(st_spider_transaction*, st_spider_conn*, bool, bool, int*) (spd_conn.cc:268)

==15440==  Address 0x13b6e6e0 is 4,352 bytes inside a block of size 21,912 free'd

==15440==    at 0x4C291ED: free (vg_replace_malloc.c:530)

==15440==    by 0xF18DB2: my_free (my_malloc.c:217)

==15440==    by 0x558D63: ilink::operator delete(void*, unsigned long) (sql_list.h:638)

==15440==    by 0x5DA2D2: THD::~THD() (sql_class.cc:1707)

==15440==    by 0x136D131F: spider_bg_sts_action(void*) (spd_conn.cc:2893)

==15440==    by 0x4E3C0DA: start_thread (in /lib64/libpthread-2.18.so)

==15440==    by 0x6B28E3C: clone (in /lib64/libc-2.18.so)

==15440==  Block was alloc'd at

==15440==    at 0x4C280F3: malloc (vg_replace_malloc.c:299)

==15440==    by 0xF188C6: my_malloc (my_malloc.c:101)

==15440==    by 0x136A631A: ilink::operator new(unsigned long) (sql_list.h:634)

==15440==    by 0x136D0B5C: spider_bg_sts_action(void*) (spd_conn.cc:2773)

==15440==    by 0x4E3C0DA: start_thread (in /lib64/libpthread-2.18.so)

==15440==    by 0x6B28E3C: clone (in /lib64/libc-2.18.so)