Public bug reported: Please see upstream php bug report: https://bugs.php.net/bug.php?id=73497
And the associated memcached bug report, which includes a patch: https://bugs.php.net/bug.php?id=73539 If more than one backend servers are configured, memcached tries to allocate 2^64 bytes of memory and fails. This issue manifest itself after the release of php 7.0.13. Description: Ubuntu 16.04.1 LTS Release: 16.04 php-memcached: Installed: 2.2.0-51-ge573a6e+2.2.0-2build2 php7.0-fpm: Installed: 7.0.13-0ubuntu0.16.04.1 php7.0-common: Installed: 7.0.13-0ubuntu0.16.04.1 >From php error log: [12-Jan-2017 08:54:10 America/New_York] PHP Fatal error: Out of memory (allocated 2097152) (tried to allocate 18446744073709551612 bytes) in /var/www/index.php on line 18 ** Affects: php-memcached (Ubuntu) Importance: Undecided Status: New -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1656023 Title: memcached fails when more than one backend server is configured. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/php-memcached/+bug/1656023/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs