Session doesn't work after update from 2.2.1 to 3

have you tried the files driver?
https://codeigniter.com/user_guide/libra...les-driver

Yeah actually I am using database driver .
$config['sess_driver'] = 'database';
$config['sess_cookie_name'] = 'ci_session';
$config['sess_expiration'] = 86400;
$config['sess_save_path'] = 'ci_sessions';
$config['sess_match_ip'] = FALSE;
$config['sess_time_to_update'] = 86400;
$config['sess_regenerate_destroy'] = FALSE;