$ ./a.out
mysql_real_connect, Error: SSL connection error: (null)
mysql_real_connect, Error: SSL connection error: (null)
mysql_real_connect, Error: SSL connection error: (null)
mysql_real_connect, Error: SSL connection error: (null)
mysql_real_connect, Error: SSL connection error: (null)
mysql_real_connect, Error: SSL connection error: (null)
Success!
Success!
$ ./a.out
Segmentation fault (core dumped)

(gdb) bt
#0  0x0000000000483d4f in sha1_block_data_order_avx ()
#1  0xca62c1d6ca62c1d6 in ?? ()
#2  0xca62c1d6ca62c1d6 in ?? ()
#3  0xca62c1d6ca62c1d6 in ?? ()
#4  0xca62c1d6ca62c1d6 in ?? ()
#5  0xca62c1d6ca62c1d6 in ?? ()
#6  0xca62c1d6ca62c1d6 in ?? ()
#7  0xca62c1d6ca62c1d6 in ?? ()
#8  0xca62c1d6ca62c1d6 in ?? ()
#9  0x00007fd6199644e0 in ?? ()
#10 0x00007fd61abfb10c in malloc () from /lib64/libc.so.6
#11 0x0000000000477e68 in CRYPTO_malloc ()
#12 0x000000000047e1af in SHA1_Update ()
#13 0x0000000000566852 in ssleay_rand_bytes ()
#14 0x000000000044210d in SSL_CTX_new ()
#15 0x000000000041f5a4 in new_VioSSLFd ()
#16 0x000000000041f9a9 in new_VioSSLConnectorFd ()
#17 0x000000000040b53f in send_client_reply_packet ()
#18 0x000000000040b82d in client_mpvio_write_packet ()
#19 0x000000000040a935 in native_password_auth_client ()
#20 0x000000000040d5d0 in run_plugin_auth ()
#21 0x000000000040e189 in mysql_real_connect ()
#22 0x00000000004039ce in thread_func() ()
#23 0x0000000000404ee3 in void std::_Bind_simple<void (*())()>::_M_invoke<>(std::_Index_tuple<>) ()
#24 0x0000000000404e3d in std::_Bind_simple<void (*())()>::operator()() ()
#25 0x0000000000404dd6 in std::thread::_Impl<std::_Bind_simple<void (*())()> >::_M_run() ()
#26 0x00007fd61b7272b0 in ?? () from /lib64/libstdc++.so.6
#27 0x00007fd61af45e25 in start_thread () from /lib64/libpthread.so.0
#28 0x00007fd61ac7334d in clone () from /lib64/libc.so.6