Is there any known bug in the session library of CodeIgniter 2.1.0? Why do I get kicked out? [closed]

Question

I'm working on a website which is created with CodeIgniter 2.1.0.

I've noticed sometimes when I reload a page couple of times or open a couple of pages very fast or when I have an error in the code (these errors are not related to sessions) I get logged out.

This website is using a library called Ion_authand for identifications:

public function logged_in()
{
  $identity = $this->ci->config->item('identity', 'ion_auth');
  return (bool) $this->ci->session->userdata($identity);
}

Is there a bug or something that I should know about?

$config['sess_cookie_name']  = 'cisession';
$config['sess_expiration']  = 7200;
$config['sess_expire_on_close'] = TRUE;
$config['sess_encrypt_cookie'] = FALSE;
$config['sess_use_database'] = TRUE;
$config['sess_table_name']  = 'cisession';
$config['sess_match_ip']  = FALSE;
$config['sess_match_useragent'] = TRUE;
$config['sess_time_to_update'] = 300;

On this website, sessions get updated almost on every page.

Answer 1

Here is what I found:

There is a bug in the session library of CodeIgniter which destroys the session with rapid requests.

Here you can find more about this bug:

https://github.com/EllisLab/CodeIgniter/issues/154

This bug still exist in the latest stable version which is 2.1.3.

I've fixed this by replacing my session library with the one from CI3-DEV from GitHub:

https://github.com/EllisLab/CodeIgniter/blob/b211adee89f5fd2192051e9c0826146bd150f469/system/libraries/Session.php

And putting a long sess_expiration and sess_time_to_update in my configuration ... mine are 86400 and 86500.