source include/have_debug.inc;
set @old_dbug=@@global.debug_dbug;

#
# use after free if need plugin change and auth aborted
#
set global debug_dbug='+d,auth_disconnect';
create user 'bad' identified by 'worse';
--error 1
--exec $MYSQL --default-auth=mysql_old_password --user=bad --password=worse
set global debug_dbug=@old_dbug;
drop user bad;