MariaDB [(none)]> select * from mysql.func;

Empty set (0.001 sec)

MariaDB [(none)]> insert into mysql.func(ret) values(1);

Query OK, 1 row affected (0.001 sec)

MariaDB [(none)]> select * from mysql.func;

+------+-----+----+----------+

| name | ret | dl | type     |

+------+-----+----+----------+

|      |   1 |    | function |

+------+-----+----+----------+

1 row in set (0.001 sec) 

Thread pointer: 0x5557ed51dad8

Attempting backtrace. You can use the following information to find out

where mysqld died. If you see no messages after this, something went

terribly wrong...

stack_bottom = 0x7ffd6e777958 thread_stack 0x49000

/data/server/build/sql/mariadbd(my_print_stacktrace+0x2e)[0x5557eb49f97e]

mysys/stacktrace.c:307(my_print_stacktrace)[0x5557eaf20daf]

sigaction.c:0(__restore_rt)[0x7f3eac7bf5f0]

:0(__strlen_sse2_pminub)[0x7f3eaae0a641]

sql/sql_udf.cc:209(udf_init())[0x5557eadd01d6]

sql/mysqld.cc:5533(mysqld_main(int, char**))[0x5557eac7a564]

??:0(__libc_start_main)[0x7f3eaacbd505]

/data/server/build/sql/mariadbd(+0x682973)[0x5557eac6e973]

the gdb core stack is:

#0  0x00007f3c8ba68a61 in pthread_kill () from /lib64/libpthread.so.0

#1  0x0000563837533557 in my_write_core (sig=<optimized out>) at /data/server/mysys/stacktrace.c:518

#2  0x0000563836fb4e1e in handle_fatal_signal (sig=11) at /data/server/sql/signal_handler.cc:330

#3  <signal handler called>

#4  0x00007f3c8a0b6641 in __strlen_sse2_pminub () from /lib64/libc.so.6

#5  0x0000563836e6418f in udf_init () at /data/server/sql/sql_udf.cc:209

#6  0x0000563836d0e564 in mysqld_main (argc=27, argv=0x563839740890) at /data/server/sql/mysqld.cc:5531

#7  0x00007f3c89f69505 in __libc_start_main () from /lib64/libc.so.6

#8  0x0000563836d02973 in _start ()