Unable to clear session lock record & failed to read session data: memcached

[ipokkel]

Describe the bug A clear and concise description of what the bug is. Please be as descriptive as possible; issues lacking detail, or for any other reason than to report a bug, may be closed or left unattended.

When session_start() is called WordPress debug log returns: Unable to clear session lock record in /public_html/wp/wp-content/plugins/paid-memberships-pro/includes/sessions.php on line 21 Failed to read session data: memcached path(server1-IP:11211;server2-IP:11211;server3-IP:11211) in /public_html/wp/wp-content/plugins/paid-memberships-pro/includes/sessions.php on line 21

Isolating the problem (mark completed items with an [x]):

• [x] I have deactivated other plugins and confirmed this bug occurs when only Paid Memberships Pro plugin is active.
• [x] This bug happens with a default WordPress theme active, or Memberlite.
• [x] I can reproduce this bug consistently using the steps above.

WordPress Environment

``` Please share non-sensitive information about your hosting environment such as WordPress version, PHP version, Paid Memberships Pro and any related plugins versions. ```

PMPro v2.0.7 PHP v7.3.3 WordPress v5.2.2

Memcached Version | 3.1.3 libmemcached version | 1.0.18

[ipokkel]

Researching the topic hints that this may be a bug with PHP 7+ and/or Memcached

• https://github.com/php-memcached-dev/php-memcached/issues/399
• https://github.com/php-memcached-dev/php-memcached/issues/269#issuecomment-271123804
• https://bugs.php.net/bug.php?id=71962