Cron causes segmentation fault

It appeared cron had been running for several days and every time it would run it would generate the error that it was already running.

Searching here I found that I should run:

delete from variable where name='cron_semaphore' or name='cron_last';
delete from cache;

and then re-run cron.

I attempted cron from inside drush and I get:

Segmentation Fault

I'm not sure how to begin troubleshooting this but I deeply appreciate any help.