The problem is definitely in httpd. Segmentation faults are usually program specific and usually represent bugs. The problem here is that there are a ton of people running that particular configuration and NOT having trouble! If I were you I would upgrade to RH9 and see if that take care of it. If you compiled your own httpd, snag the latest of everything and recompile from scratch.
When an error starts happening when it hasn't ever happened before, the first question to ask is: what changed? If you didn't upgrade apache or change any web sites or any configuration, and the errors just started to crop up, you may have been broken into. If you compiled your own, compare the checksum of the running apache to the version you compiled.
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