Apache22. Child pid exit signal Illegal instruction (4)

I have two almost the same servers, with one application - eGroupWare. On one sometimes I get an Apache error :
Code:
Child pid exit signal Illegal instruction (4)
With another one everything is alright. How do I found the reason?

The server with the problem: 9.2-RELEASE, Apache/2.2.25 and PHP 5.2.17, all the libraries the same. The server without problems: all (Apache, PHP and libraries) the same but 9.1-RELEASE-p4.
 
It's very likely the problems are caused by an out of date PHP.
 
SirDice said:
It's very likely the problems are caused by an out of date PHP.
No. I said that I have two servers, one of which has been working just fine, for years. And I also tried different PHP versions; doesn't help.
 
idle said:
And I also tried different PHP version, doesn't help.
Which ones? Apparently there's no problem updating PHP so I would really suggest using the latest version. PHP 5.2 contains some very nasty security bugs.
 
I don't want to upgrade PHP, at this moment. I want to find out the reason of this error.
 
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