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After updating my Drupal test server to have a fresh copy of the database and code from the production system, "drush cc all" would fail with a message saying

PHP Fatal error: Call to undefined function user_load() in /usr/share/pear/drush/includes/drupal.inc on line 138

I'm running drush version 6.2.0 with a drupal 7.25 system. I'm using memcache as cache_default_class.

  • Can you clear caches via the Performance screen? Does the site work otherwise? – jmking Jan 13 '14 at 22:09
  • The site was completely dead, white screen and a fatal PHP error in the apache error log: "PHP Fatal error: Call to undefined function system_run_automated_cron() in /srv/www/www.imsa.edu/drupal1/includes/common.inc on line 2706" – Fred Yankowski Jan 14 '14 at 15:05
  • Sounds like you're missing some files. Are you sure you copied everything from production? – jmking Jan 14 '14 at 15:06
  • jmking, that's what I thought too, but I diffed the files between test and production and they matched exactly (except for settings.php, of course). – Fred Yankowski Jan 14 '14 at 15:11
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The problem went away after I restarted memcached.

I discovered that by running drush with -d and seeing a PHP error about a $theme value not being a valid index. Tracing the code showed that access to cache_bootstrap was getting empty arrays for the module and theme data.

From now on I plan to restart memcached or flush its cache on my test server after rebuilding its database. (I've done this kind of rebuilding dozens of times before with no issues.)

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