Cron failed with drush: Segmentation fault In Drupal 6, whenever I run cron from web interface I get an Internal server error and when I run 

drush cron 


I just get

Segmentation fault


What can be wrong here and how can I fix it?
It sounds like a resource problem.  Memory limits tend to be the culprit.

Check to see that drush is using the same php.ini file your site is.

drush status


Tells you what php you are using for drush.

Running the following will give you memory output information when running cron

drush cron -d


if that memory stack is near what your php.ini limit is.. raise it up an integer of 32Mb. (i.e. 128mb to 160mb)  and then test again.