WordpressMulti - exit signal Segmentation fault (11)

WP-MU Version 2.8.4 running on PHP Version 5.2.4-2ubuntu5.7 , MySQL Version 5.0.51a-3ubuntu5.4, Apache/2.2.8 (Ubuntu) I have big problem with my Wordpress MU Every hit on the blog generate exit signal segmentation fault (11) in Apache logs. Some times Apache even get frozen and doesn't serv any website while heating 95% of the CPU. It looks like this: [Thu Oct 22 09:07:01 2009] [notice] child pid 30490 exit signal Segmentation fault (11) I have been checking postings in diffrent forums but nobody seems to have a solution for this. Many says the problem is not with Wordpress multi and that it must be the server but i cannot find the problem. I have tested on 2 of my servers and both get same problem