(gdb) c
Continuing.
[New Thread 0x7fffd32f4700 (LWP 502833)]

Thread 13 "mariadbd" received signal SIGABRT, Aborted.
[Switching to Thread 0x7fffd32f4700 (LWP 502833)]
__GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:50
50      ../sysdeps/unix/sysv/linux/raise.c: No such file or directory.
(gdb) bt
#0  __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:50
#1  0x00007ffff7654859 in __GI_abort () at abort.c:79
#2  0x00007ffff7654729 in __assert_fail_base (
    fmt=0x7ffff77ea588 "%s%s%s:%u: %s%sAssertion `%s' failed.\n%n",
    assertion=0x555557b9053c "pos->field != __null || pos->item != __null",
    file=0x555557b90138 "/home/mariadb/sql/filesort.cc", line=663,
    function=<optimized out>) at assert.c:94
#3  0x00007ffff7665fd6 in __GI___assert_fail (
    assertion=0x555557b9053c "pos->field != __null || pos->item != __null",
    file=0x555557b90138 "/home/mariadb/sql/filesort.cc", line=663,
    function=0x555557b90444 "Sort_keys *Filesort::make_sortorder(THD *, JOIN *, table_map)") at assert.c:103
#4  0x000055555677c83f in Filesort::make_sortorder (
    this=this@entry=0x7fffd32f2ad0, thd=thd@entry=0x62c0001d0288,
    join=join@entry=0x0, first_table_bit=first_table_bit@entry=0)
    at /home/mariadb/sql/filesort.cc:663
#5  0x0000555556778acd in filesort (thd=0x7fffd32f2110, thd@entry=0x62c0001d0288,
    table=table@entry=0x619000073108, filesort=0x2,
    filesort@entry=0x7fffd32f2ad0, tracker=0x6290000e8868, join=join@entry=0x0,
    first_table_bit=first_table_bit@entry=0) at /home/mariadb/sql/filesort.cc:230
#6  0x00005555563f7b4c in Sql_cmd_update::update_single_table (
    this=this@entry=0x6290000e6d30, thd=thd@entry=0x62c0001d0288)
    at /home/mariadb/sql/sql_update.cc:712
#7  0x0000555556405bf4 in Sql_cmd_update::execute_inner (this=0x6290000e6d30,
    thd=0x62c0001d0288) at /home/mariadb/sql/sql_update.cc:3076
#8  0x0000555556312883 in Sql_cmd_dml::execute (this=0x6290000e6d30,
    thd=0x62c0001d0288) at /home/mariadb/sql/sql_select.cc:33587
#9  0x00005555561e0877 in mysql_execute_command (thd=thd@entry=0x62c0001d0288,
    is_called_from_prepared_stmt=52) at /home/mariadb/sql/sql_parse.cc:4375
#10 0x00005555561d19e8 in mysql_parse (thd=thd@entry=0x62c0001d0288,
    rawbuf=0x6290000e62a8 "UPDATE v0 SET v1 = 2147483647 ORDER BY AVG ( v1 ) DESC", length=<optimized out>, parser_state=parser_state@entry=0x7fffd32f3400)
    at /home/mariadb/sql/sql_parse.cc:7798
#11 0x00005555561cd644 in dispatch_command (command=command@entry=COM_QUERY,
    thd=thd@entry=0x62c0001d0288,
    packet=packet@entry=0x6290000dc289 "UPDATE v0 SET v1 = 2147483647 ORDER BY AVG ( v1 ) DESC", packet_length=packet_length@entry=54, blocking=156)
    at /home/mariadb/sql/sql_parse.cc:1893
#12 0x00005555561d2812 in do_command (thd=0x62c0001d0288, blocking=100)
    at /home/mariadb/sql/sql_parse.cc:1406
#13 0x00005555564ad3f6 in do_handle_one_connection (connect=<optimized out>,
    connect@entry=0x611000026048, put_in_cache=4)
    at /home/mariadb/sql/sql_connect.cc:1417
#14 0x00005555564acfbc in handle_one_connection (arg=arg@entry=0x611000026048)
--Type <RET> for more, q to quit, c to continue without paging--
    at /home/mariadb/sql/sql_connect.cc:1319
#15 0x0000555556e345ff in pfs_spawn_thread (arg=0x618000006108)
    at /home/mariadb/storage/perfschema/pfs.cc:2201
#16 0x00007ffff7c1a609 in start_thread (arg=<optimized out>)
    at pthread_create.c:477
#17 0x00007ffff7751353 in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95