One of my websites gives a lot of internal server errors. When I restart httpd they are gone for a while. But after some time they come back. And once or twice they have frozen the whole server/VPS.
When I check the log files I come across these errors: * glibc detected * /usr/sbin/httpd: free(): invalid pointer: 0x00007f1d55342fa8 *** And sometimes also preceded with: zend_mm_heap corrupted
I am running CentOS 6.5 and use VestaCP as a hosting control panel. VestaCP installed Apache/2.2.15, PHP 5.4.21, APC 3.1.15
My server runs 4-5 tiny websites on a VPS with 4GB RAM. The site giving the problems is build with Drupal 7. My other websites are build with Laravel and don't seem to cause any problems. But I am not sure if it is a problem with that Drupal website or server configuration.
Can anyone show me the right direction to solve this problem? Thank you.