I’ve been busy setting up a new hosting environment for a bunch of static HTML and PHP-based web sites on a Go Daddy Virtual Server. It was going swimmingly, until I came to an old CMS Made Simple site (running 0.10.x), which merely returned blank pages. Newer versions of CMS Made Simple ran fine. I could find nothing in the virtual host’s web error logs, the php log, the mysql error logs, the eaccelerator error logs, or any other system logs — except in the main Apache error log, there was:

child pid XXXXX exit signal Segmentation fault (11)

Searching around, this looks like it could be some kind of threading issue; however, I’m following the recommendations and using the Apache 2 prefork MPM.

Eventually, the (weak) solution I came up with is to turn off eaccelerator for that virtual host. This remedies the situation, although I can’t say it makes me very happy, since I don’t understand exactly what’s going on (or what the problem is).

I’d welcome insight into this.

Details: Fedora Core 4, Apache/2.0.54 (Fedora), PHP 5.0.4, eAccelerator 0.9.5.