(gdb) c
Continuing.
[New Thread 0x7fe254069700 (LWP 5186)]

Thread 13 "mariadbd" received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0x7fe254069700 (LWP 5186)]
0x000055b72ac9a3c3 in Item_func_n--Type <RET> for more, q to quit, c to continue without paging--
ot::fix_fields (
    this=0x7fe21c0148d0, thd=
    0x7fe21c000c58, ref=0x0)
    at /home/mariadb/sql/item_cmpfunc.cc:6634
6634          rc= (*ref= new_item)->fix_fields(thd, ref);
(gdb) bt
#0  0x000055b72ac9a3c3 in Item_func_not::fix_fields (
    this=0x7fe21c0148d0, 
    thd=0x7fe21c000c58, ref=0x0)
    at /home/mariadb/sql/item_cmpfunc.cc:6634
#1  0x000055b72a35b587 in st_select_lex::pushdown_from_having_into_where (this=0x7fe21c013768, 
--Type <RET> for more, q to quit, c to continue without paging--
    0x7fe21c000c58, having=0x0) at /home/mariadb/sql/sql_lex.cc:11274
#2  0x000055b72a5652c6 in JOIN::optimize_inner (this=0x7fe21c0165b8)
    at /home/mariadb/sql/sql_select.cc:2380
#3  0x000055b72a5721fa in JOIN::optimize (this=0x7fe21c0165b8)
    at /home/mariadb/sql/sql_select.cc:1944
#4  0x000055b72a6893e5 in st_select_lex_unit::optimize (
    this=this@entry=0x7fe21c004f10) at /home/mariadb/sql/sql_union.cc:2262
#5  0x000055b72a689798 in st_select_lex_unit::exec_inner (
    this=0x7fe21c004f10) at /home/mariadb/sql/sql_union.cc:2309
--Type <RET> for more, q to quit, c to continue without paging--
#6  0x000055b72a694a78 in mysql_union (thd=thd@entry=0x7fe21c000c58, 
    lex=lex@entry=0x7fe21c004e30, result=result@entry=0x7fe21c0164a0, 
    unit=unit@entry=0x7fe21c004f10, 
    setup_tables_done_option=<optimized out>)
    at /home/mariadb/sql/sql_union.cc:45
#7  0x000055b72a5734bd in handle_select (thd=thd@entry=0x7fe21c000c58, 
    lex=lex@entry=0x7fe21c004e30, result=result@entry=0x7fe21c0164a0, 
    setup_tables_done_option=setup_tables_done_option@entry=0)
    at /home/mariadb/sql/sql_select.cc:618
--Type <RET> for more, q to quit, c to continue without paging--
#8  0x000055b72a399ac5 in execute_sqlcom_select (thd=0x7fe21c000c58, 
    all_tables=0x7fe21c013d98) at /home/mariadb/sql/sql_parse.cc:6029
#9  0x000055b72a3c709f in mysql_execute_command (thd=0x7fe21c000c58, 
    is_called_from_prepared_stmt=<optimized out>)
    at /home/mariadb/sql/sql_parse.cc:3924
#10 0x000055b72a38acce in mysql_parse (thd=0x7fe21c000c58, 
    rawbuf=<optimized out>, length=<optimized out>, 
    parser_state=<optimized out>) at /home/mariadb/sql/sql_parse.cc:7748
#11 0x000055b72a3ac755 in dispatch_command (command=COM_QUERY, 
--Type <RET> for more, q to quit, c to continue without paging--
    thd=0x7fe21c000c58, packet=<optimized out>, 
    packet_length=<optimized out>, blocking=<optimized out>)
    at /home/mariadb/sql/sql_class.h:1551
#12 0x000055b72a3b41ad in do_command (thd=0x7fe21c000c58, 
    blocking=blocking@entry=true) at /home/mariadb/sql/sql_parse.cc:1406
#13 0x000055b72a7b4732 in do_handle_one_connection (
    connect=<optimized out>, put_in_cache=true)
    at /home/mariadb/sql/sql_connect.cc:1418
#14 0x000055b72a7b543d in handle_one_connection (
--Type <RET> for more, q to quit, c to continue without paging--
    arg=arg@entry=0x55b72f0bd9b8) at /home/mariadb/sql/sql_connect.cc:1320
#15 0x000055b72b379c88 in pfs_spawn_thread (arg=0x55b72f0e5448)
    at /home/mariadb/storage/perfschema/pfs.cc:2201
#16 0x00007fe26b067609 in start_thread (arg=<optimized out>)
    at pthread_create.c:477
#17 0x00007fe26ac38353 in clone ()
    at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95