Fatal error: Call to undefined function lock_initialize()

Question

I am getting this error on a Drupal 7 site on Ubuntu 12.10. I downgraded PHP from 5.4 to 5.3, but am still getting it.

Does anyone recognize this error?

Fatal error: Call to undefined function lock_initialize() in /home/buck/drupal/cms/includes/bootstrap.inc on line 2366

Answer 1

The function is called using code similar to the following, from Drupal.

  // Initialize the lock system.
  require_once DRUPAL_ROOT . '/' . variable_get('lock_inc', 'includes/lock.inc');
  lock_initialize();

_drupal_bootstrap_variables() is the only Drupal function that calls lock_initialize().

That code could fail if the file whose name is contained in lock_inc doesn't exist, but in that case I would expect another warning/error message, or it doesn't contain a function called lock_initialize().

I would check if there is code that sets $conf['lock_inc'], and which value is used. I would also check if there is code calling variable_set('lock_inc', ...).

Answer 2

I ran into this problem too. It occurred when I mysqldump'd my drupal db from my local dev machine and dumped it into my production db. I believe one of the cache tables had an entry that was referencing a file path that doesn't exist on my production server.

My fix: truncate all cache tables

I also restarted apache after that, but restarting apache was likely unnecessary. If you're running on linux, here's an easy command to truncate all your cache tables:

echo "show tables" | mysql yourdb | fgrep cache | xargs -I {} echo "truncate {};" | mysql yourdb