Unstick

Unstick is a tiny module that does its best to get cron unstuck.

Specifically, unstick is designed to address the error message: Attempting to re-run cron while it is already running when you know cron is not actually running.

Pressing the unstick button is the same as running the following SQL queries:

DELETE FROM `variable` WHERE name = 'cron_semaphore';
DELETE FROM `variable` WHERE name = 'cron_last';

and flushing the cache.

An alternative

Please consider Drupal Tweaks, which has this exact same functionality and more. Had I known about Tweaks, it is unlikely I would have written unstick.

http://drupal.org/project/drupal_tweaks

Credits

Unstick was developed by Inner File Software, which offers custom Drupal module development in Washington, DC.