Sequences of tests fail with valgrind warnings in buildbot (blocks are still reachable in loss record in malloc)

main.udf_notembedded                     w11 [ fail ]  Found warnings/errors in server log file!

        Test ended at 2017-01-05 00:53:14

line

==17254== 32 bytes in 1 blocks are still reachable in loss record 3 of 5

==17254==    at 0x4C28BE3: malloc (vg_replace_malloc.c:299)

==17254==    by 0x4014C93: _dl_close_worker (in /usr/lib64/ld-2.17.so)

==17254==    by 0x401529B: _dl_close (in /usr/lib64/ld-2.17.so)

==17254==    by 0x400F313: _dl_catch_error (in /usr/lib64/ld-2.17.so)

==17254==    by 0x6426DCE: __libc_dlclose (in /usr/lib64/libc-2.17.so)

==17254==    by 0x6459FA6: free_mem (in /usr/lib64/libc-2.17.so)

==17254==    by 0x6459CF1: __libc_freeres (in /usr/lib64/libc-2.17.so)

==17254==    by 0x4A23749: _vgnU_freeres (vg_preloaded.c:77)

==17254==    by 0x632F1DA: __run_exit_handlers (in /usr/lib64/libc-2.17.so)

==17254==    by 0x632F264: exit (in /usr/lib64/libc-2.17.so)

==17254==    by 0x552F8B: mysqld_exit(int) (mysqld.cc:1767)

==17254==    by 0x558920: mysqld_main(int, char**) (mysqld.cc:5069)

==17254==    by 0x5508FF: main (main.cc:25)

^ Found warnings in /dev/shm/var/11/log/mysqld.1.err

main.type_bit main.type_blob main.type_date main.type_datetime main.type_decimal main.type_enum main.type_float main.type_nchar main.type_newdecimal main.type_ranges main.type_set main.type_time main.type_timestamp main.type_uint main.type_varchar main.type_year main.udf main.udf_debug_sync main.udf_notembedded