using sql_service within encryption key management plugin segfaults

#1  0x000055b88831064a in my_write_core (sig=11) at /home/dan/repos/mariadb-server-10.4/mysys/stacktrace.c:386

#2  0x000055b8879b13fa in handle_fatal_signal (sig=11) at /home/dan/repos/mariadb-server-10.4/sql/signal_handler.cc:369

#3  <signal handler called>

#4  0x000055b88830eb65 in my_thread_name () at /home/dan/repos/mariadb-server-10.4/mysys/my_thr_init.c:426

#5  0x000055b88832018a in wt_thd_lazy_init (thd=0x7f3e28004d78, ds=0x7f3e28002198, ts=0x7f3e28002190, dl=0x7f3e280021a8, tl=0x7f3e280021a0)

    at /home/dan/repos/mariadb-server-10.4/mysys/waiting_threads.c:513

#6  0x000055b8875d16c1 in THD::THD (this=0x7f3e280016e0, id=0, is_wsrep_applier=false)

    at /home/dan/repos/mariadb-server-10.4/sql/sql_class.cc:782

#7  0x000055b887686064 in mysql_real_connect_local (mysql=0x7f3e28000e40) at /home/dan/repos/mariadb-server-10.4/sql/sql_prepare.cc:6207

#8  0x00007f3e8046d36f in connect_local ()

    at /home/dan/repos/mariadb-server-10.4/plugin/example_keymgt_sql_service/example_keymgt_sql_service.cc:63

#9  0x00007f3e8046d3ff in get_latest_key_version (key_id=1)

    at /home/dan/repos/mariadb-server-10.4/plugin/example_keymgt_sql_service/example_keymgt_sql_service.cc:84

#10 0x000055b8881d8a92 in fil_space_crypt_t::key_get_latest_version (this=0x7f3e28000b70)

    at /home/dan/repos/mariadb-server-10.4/storage/innobase/fil/fil0crypt.cc:141

#11 0x000055b8881dfbd7 in fil_space_crypt_t::fil_space_crypt_t (this=0x7f3e28000b70, new_type=0, new_min_key_version=0, new_key_id=1,

    new_encryption=FIL_ENCRYPTION_DEFAULT) at /home/dan/repos/mariadb-server-10.4/storage/innobase/include/fil0crypt.h:135

#12 0x000055b8881d8c96 in fil_space_create_crypt_data (type=0, encrypt_mode=FIL_ENCRYPTION_DEFAULT, min_key_version=0, key_id=1)

    at /home/dan/repos/mariadb-server-10.4/storage/innobase/fil/fil0crypt.cc:231

#13 0x000055b8881d8cf2 in fil_space_create_crypt_data (encrypt_mode=FIL_ENCRYPTION_DEFAULT, key_id=1)

    at /home/dan/repos/mariadb-server-10.4/storage/innobase/fil/fil0crypt.cc:251

#14 0x000055b8881db1c9 in fil_crypt_start_encrypting_space (space=0x55b88a63e460)

    at /home/dan/repos/mariadb-server-10.4/storage/innobase/fil/fil0crypt.cc:1141

#15 0x000055b8881db8c6 in fil_crypt_space_needs_rotation (state=0x7f3e597f9bf0, key_state=0x7f3e597f9be4, recheck=0x7f3e597f9bcb)

    at /home/dan/repos/mariadb-server-10.4/storage/innobase/fil/fil0crypt.cc:1326

#16 0x000055b8881dc564 in fil_crypt_find_space_to_rotate (key_state=0x7f3e597f9be4, state=0x7f3e597f9bf0, recheck=0x7f3e597f9bcb)

    at /home/dan/repos/mariadb-server-10.4/storage/innobase/fil/fil0crypt.cc:1754

#17 0x000055b8881de74d in fil_crypt_thread () at /home/dan/repos/mariadb-server-10.4/storage/innobase/fil/fil0crypt.cc:2456

Thread 12 received signal SIGSEGV, Segmentation fault.

0x00000000006f1271 in THD::store_globals (this=0x7ff8680354d8) at /home/dan/repos/mariadb-server-11.3/sql/sql_class.cc:2193

2193      mysys_var->id=      thread_id;

(rr) p mysys_var

$5 = (st_my_thread_var *) 0x0

(rr) bt

#0  0x00000000006f1271 in THD::store_globals (this=0x7ff8680354d8) at /home/dan/repos/mariadb-server-11.3/sql/sql_class.cc:2193

#1  0x000000000076a634 in mysql_real_connect_local (mysql=0x7ff868034d98) at /home/dan/repos/mariadb-server-11.3/sql/sql_prepare.cc:6276

#2  0x00007ff8a8fa4318 in connect_local ()

    at /home/dan/repos/mariadb-server-11.3/plugin/example_keymgt_sql_service/example_keymgt_sql_service.cc:62

#3  0x00007ff8a8fa4409 in get_latest_key_version (key_id=<optimized out>)

    at /home/dan/repos/mariadb-server-11.3/plugin/example_keymgt_sql_service/example_keymgt_sql_service.cc:83

#4  0x0000000000d32db4 in fil_space_crypt_t::key_get_latest_version (this=0x7ff868007ce8)

    at /home/dan/repos/mariadb-server-11.3/storage/innobase/fil/fil0crypt.cc:139

#5  fil_space_crypt_t::fil_space_crypt_t (this=this@entry=0x7ff868007ce8, new_type=new_type@entry=0,

    new_min_key_version=new_min_key_version@entry=0, new_key_id=new_key_id@entry=1,

    new_encryption=new_encryption@entry=FIL_ENCRYPTION_DEFAULT)

    at /home/dan/repos/mariadb-server-11.3/storage/innobase/include/fil0crypt.h:129

#6  0x0000000000d30578 in fil_space_create_crypt_data (type=0, encrypt_mode=FIL_ENCRYPTION_DEFAULT, min_key_version=0, key_id=1)

    at /home/dan/repos/mariadb-server-11.3/storage/innobase/fil/fil0crypt.cc:222

#7  fil_space_create_crypt_data (encrypt_mode=FIL_ENCRYPTION_DEFAULT, key_id=1)

    at /home/dan/repos/mariadb-server-11.3/storage/innobase/fil/fil0crypt.cc:245

#8  fil_crypt_start_encrypting_space (space=0x4287608) at /home/dan/repos/mariadb-server-11.3/storage/innobase/fil/fil0crypt.cc:954

#9  fil_crypt_space_needs_rotation (state=0x7ff884fb1900, key_state=<optimized out>, recheck=<optimized out>)

    at /home/dan/repos/mariadb-server-11.3/storage/innobase/fil/fil0crypt.cc:1116

#10 fil_crypt_find_space_to_rotate (state=<optimized out>, key_state=<optimized out>, recheck=<optimized out>)

    at /home/dan/repos/mariadb-server-11.3/storage/innobase/fil/fil0crypt.cc:1527

#11 fil_crypt_thread () at /home/dan/repos/mariadb-server-11.3/storage/innobase/fil/fil0crypt.cc:2035

#12 0x00007ff8a82e31b3 in execute_native_thread_routine () from /lib64/libstdc++.so.6

#13 0x00007ff8a80ac897 in start_thread () from /lib64/libc.so.6

#14 0x00007ff8a8133524 in clone () from /lib64/libc.so.6