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Bug: [Memcached] session_start(): Unable to clear session lock record #7604

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Bug: [Memcached] session_start(): Unable to clear session lock record#7604
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bugVerified issues on the current code behavior or pull requests that will fix themcan of worms

Description

@sandydevvns
sandydevvns
opened on Jun 21, 2023

PHP Version

8.2

CodeIgniter4 Version

4.3.2

CodeIgniter4 Installation Method

Composer (using codeigniter4/appstarter)

Which operating systems have you tested for this bug?

Linux

Which server did you use?

fpm-fcgi

Database

Mysql 5.7

What happened?

I have configured session store as memcached, it was working fine in PHP 7.1 with codeIgniter 2,

After upgrading PHP 7.1 to 8.2 and codeIgniter 2 to 4 I am getting an error on multiple async ajax call

session_start(): Unable to clear session lock record
in SYSTEMPATH/Session/Session.php on line 928.
 1 [internal function]: CodeIgniter\Debug\Exceptions->errorHandler()
 2 SYSTEMPATH/Session/Session.php(928): session_start()
 3 SYSTEMPATH/Session/Session.php(250): CodeIgniter\Session\Session->startSession()
 4 SYSTEMPATH/Config/Services.php(674): CodeIgniter\Session\Session->start()
 5 SYSTEMPATH/Config/BaseService.php(252): CodeIgniter\Config\Services::session()
 6 SYSTEMPATH/Config/BaseService.php(193): CodeIgniter\Config\BaseService::__callStatic()
 7 SYSTEMPATH/Config/Services.php(641): CodeIgniter\Config\BaseService::getSharedInstance()
 8 SYSTEMPATH/Config/BaseService.php(252): CodeIgniter\Config\Services::session()
 9 SYSTEMPATH/Common.php(988): CodeIgniter\Config\BaseService::__callStatic()

codeIgniter official website also suggests to use session_write_close() for resolving this issue. But this did not work for ajax concurrent call.

Steps to Reproduce

When I am calling multiple sync ajax than getting error

Expected Output

Getting Json Response

Anything else?

No response

Activity

  1. sandydevvns
    added
    bugVerified issues on the current code behavior or pull requests that will fix them
    on Jun 21, 2023
  2. kenjis
    changed the title [-]Bug: [/-] [+]Bug: session_start(): Unable to clear session lock record[/+] on Jun 21, 2023

  3. kenjis commented on Jun 21, 2023

    @kenjis
    kenjis
    on Jun 21, 2023
    Member

    Do you use the same version of Memcached with CI2 and CI4?

  4. kenjis commented on Jun 21, 2023

    @kenjis
    kenjis
    on Jun 21, 2023
    Member

    Try:

    [memcached]
memcached.sess_lock_wait_min = 100;
memcached.sess_lock_wait_max = 1000;
memcached.sess_lock_retries = 30;

  5. sandeephealthians190 commented on Jun 22, 2023

    @sandeephealthians190
    sandeephealthians190
    on Jun 22, 2023

    Do you use the same version of Memcached with CI2 and CI4?

    yes I am using same version of memcached 1.6.6

  6. kenjis
    changed the title [-]Bug: session_start(): Unable to clear session lock record[/-] [+]Bug: [Memcached] session_start(): Unable to clear session lock record[/+] on Jun 23, 2023

  7. kenjis commented on Dec 12, 2023

    @kenjis
    kenjis
    on Dec 12, 2023
    Member

    See bcit-ci/CodeIgniter#5382

  8. michalsn
    added
    can of worms
    on Feb 19, 2026
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