#0 0x3533f3d in my_dir /home/kevg/work/m/bb-10.2-kevgs/build_ubsan/../mysys/my_lib.c:186:20

    #1 0x160a3dd in mysql_rm_db_internal(THD*, char*, bool, bool) /home/kevg/work/m/bb-10.2-kevgs/build_ubsan/../sql/sql_db.cc:861:15

    #2 0x1609d9c in mysql_rm_db(THD*, char*, bool) /home/kevg/work/m/bb-10.2-kevgs/build_ubsan/../sql/sql_db.cc:1071:10

    #3 0x1719434 in mysql_execute_command(THD*) /home/kevg/work/m/bb-10.2-kevgs/build_ubsan/../sql/sql_parse.cc:4735:10

    #4 0x17eb46d in Prepared_statement::execute(String*, bool) /home/kevg/work/m/bb-10.2-kevgs/build_ubsan/../sql/sql_prepare.cc:4837:14

    #5 0x17e067a in Prepared_statement::execute_loop(String*, bool, unsigned char*, unsigned char*) /home/kevg/work/m/bb-10.2-kevgs/build_ubsan/../sql/sql_prepare.cc:4266:10

    #6 0x17dfe8e in mysql_sql_stmt_execute(THD*) /home/kevg/work/m/bb-10.2-kevgs/build_ubsan/../sql/sql_prepare.cc:3374:16

    #7 0x170ae11 in mysql_execute_command(THD*) /home/kevg/work/m/bb-10.2-kevgs/build_ubsan/../sql/sql_parse.cc:3547:5

    #8 0x16fc816 in mysql_parse(THD*, char*, unsigned int, Parser_state*, bool, bool) /home/kevg/work/m/bb-10.2-kevgs/build_ubsan/../sql/sql_parse.cc:7739:18

    #9 0x16f3a09 in handle_bootstrap_impl(THD*) /home/kevg/work/m/bb-10.2-kevgs/build_ubsan/../sql/sql_parse.cc:1049:5

    #10 0x16f2748 in do_handle_bootstrap(THD*) /home/kevg/work/m/bb-10.2-kevgs/build_ubsan/../sql/sql_parse.cc:1101:3

    #11 0x16f2480 in handle_bootstrap /home/kevg/work/m/bb-10.2-kevgs/build_ubsan/../sql/sql_parse.cc:1084:3

    #12 0x7fd89f761668 in start_thread /build/glibc-t7JzpG/glibc-2.30/nptl/pthread_create.c:479:8

    #13 0x7fd89ec2a322 in clone /build/glibc-t7JzpG/glibc-2.30/misc/../sysdeps/unix/sysv/linux/x86_64/clone.S:95