I have recently started having core dump files in public_html folder. I've downloaded a couple of them and run "gdb -c" on them, and it tells me they were generated by wp-cron.php.
So I installed a cron view plugin to see what's set up. The only two things which happen as frequently as the core files are generated are the following...
Jul 4, 2013 @ 23:32 (1372980771) Every 5 Mins membership_communications_process
Jul 4, 2013 @ 23:37 (1372981068) Every 15 Mins membership_perform_cron_processes_quarterhourly
So it looks like it's pointing to the membership plugin. Are there any open issues on this?
Am I safe to verify my theory by deactivating the membership plugin? I have a site that is going live in 3 days and cannot risk losing all the membership setup!
Though I have seen core files 1 minute apart - which is obviously more often than the 5 minutes cron.
I am running WP3.5.2 with all plugins up to date.