encryption tests fail massively in buildbot with valgrind

encryption.innodb_encryption 'xtradb'    w1 [ fail ]  Found warnings/errors in server log file!

        Test ended at 2016-12-11 07:41:19

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==25332== Use of uninitialised value of size 8

==25332==    at 0x5B80ECA: AES_encrypt (in /usr/lib64/libcrypto.so.0.9.8)

==25332==    by 0x5BCC208: ??? (in /usr/lib64/libcrypto.so.0.9.8)

==25332==    by 0x5BCA46F: EVP_EncryptUpdate (in /usr/lib64/libcrypto.so.0.9.8)

==25332==    by 0x11B029D: MyCTX::update(unsigned char const*, unsigned int, unsigned char*, unsigned int*) (my_crypt.cc:59)

==25332==    by 0x11AFED9: my_aes_crypt_update (my_crypt.cc:244)

==25332==    by 0x11B0210: my_aes_crypt (my_crypt.cc:263)

==25332==    by 0xDCF6A0: init_crypt_key(crypt_info_t*) (log0crypt.cc:276)

==25332==    by 0xDCF795: add_crypt_info(crypt_info_t*, bool) (log0crypt.cc:324)

==25332==    by 0xDCFBA4: log_crypt_set_ver_and_key(unsigned long) (log0crypt.cc:392)

==25332==    by 0xDCAA1E: recv_recovery_from_checkpoint_start(unsigned long) (log0recv.cc:4367)

==25332==    by 0xEEA0CE: innobase_start_or_create_for_mysql() (srv0start.cc:2224)

==25332==    by 0xD361DA: innobase_init(void*) (ha_innodb.cc:4573)

encryption.innodb_encryption_is 'cbc,xtradb' w4 [ fail ]  Found warnings/errors in server log file!

        Test ended at 2016-12-11 08:18:26

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==2232== Thread 9:

==2232== Syscall param pwrite64(buf) points to uninitialised byte(s)

==2232==    at 0x4E3F3C8: ??? (in /lib64/libpthread-2.9.so)

==2232==    by 0xDE4BE9: SyncFileIO::execute(IORequest const&) (os0file.cc:2199)

==2232==    by 0xDE4CA5: os_file_io(IORequest const&, int, void*, unsigned long, unsigned long, dberr_t*) (os0file.cc:5617)

==2232==    by 0xDE59B1: os_file_pwrite(IORequest&, int, unsigned char const*, unsigned long, unsigned long, dberr_t*) (os0file.cc:5716)

==2232==    by 0xDE5AFF: os_file_write_page(IORequest&, char const*, int, unsigned char const*, unsigned long, unsigned long) (os0file.cc:5746)

==2232==    by 0xDE5F37: os_file_write_func(IORequest&, char const*, int, void const*, unsigned long, unsigned long) (os0file.cc:6291)

==2232==    by 0xDE6565: os_aio_func(IORequest&, unsigned long, char const*, int, void*, unsigned long, unsigned long, bool, fil_node_t*, void*, unsigned long*) (os0file.cc:7549)

==2232==    by 0x1048F09: pfs_os_aio_func(IORequest&, unsigned long, char const*, int, void*, unsigned long, unsigned long, bool, fil_node_t*, void*, unsigned long*, char const*, unsigned long) (os0file.ic:259)

==2232==    by 0x105444E: fil_io(IORequest const&, bool, page_id_t const&, page_size_t const&, unsigned long, unsigned long, void*, void*, unsigned long*) (fil0fil.cc:5749)

==2232==    by 0xDB7ECC: log_group_write_buf(log_group_t*, unsigned char*, unsigned long, unsigned long, unsigned long, unsigned long) (log0log.cc:1137)

==2232==    by 0xDB85FB: log_write_up_to(unsigned long, bool) (log0log.cc:1396)

==2232==    by 0xFDA4E0: buf_flush_write_block_low(buf_page_t*, buf_flush_t, bool) (buf0flu.cc:1046)

==2232==  Address 0x19e85420 is 992 bytes inside a block of size 2,097,664 alloc'd

==2232==    at 0x4C25553: calloc (vg_replace_malloc.c:711)

==2232==    by 0xDB956E: log_init() (log0log.cc:823)

==2232==    by 0xEE8EDC: innobase_start_or_create_for_mysql() (srv0start.cc:1837)

==2232==    by 0xD361DA: innobase_init(void*) (ha_innodb.cc:4573)

==2232==    by 0x9BDBD5: ha_initialize_handlerton(st_plugin_int*) (handler.cc:512)

==2232==    by 0x741957: plugin_initialize(st_mem_root*, st_plugin_int*, int*, char**, bool) (sql_plugin.cc:1415)

==2232==    by 0x745FD6: plugin_init(int*, char**, int) (sql_plugin.cc:1689)

==2232==    by 0x64AEBE: init_server_components() (mysqld.cc:5293)

==2232==    by 0x64D102: mysqld_main(int, char**) (mysqld.cc:5884)

==2232==    by 0x63B9D6: main (main.cc:25)