Coding error detected, it must be fixed by a programmer: A lock was created but not released at:
[dirroot]/admin/tool/objectfs/classes/local/store/object_file_system.php on line 317
Code should look like:
$factory = \core\lock\lock_config::get_lock_factory('type');
$lock = $factory->get_lock(0b72c7ac7d7d1dcb6eaf5f797a2881181eee2669);
$lock->release(); // Locks must ALWAYS be released like this.
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