After some thinking time I decided to compile perl 5.8.0 on the older system that did have 5.6.1. It would seem it has nothing to do with perl 5.8.0. I compiled perl 5.8.0 on the older system and preloading worked just like it should.
Now I know that it does not have anything to do with perl or mod_perl but
rather the newer gcc and glibc on the newer system.
New system: gcc-3.2.2 glibc-2.3.2
Old system glibc-2.2.4 gcc-2.96
Has anyone else had problems with gcc-3.2.2 or glibc-2.3.2 and shared memory?
Ask at the glibc list? or may be p5p, as there are quite a few knowledgeable folks over there...
Next I am going to try perl 5.8.1 snapshot to see what happens.
Probably nothing will change on the sharing front, but you will get a better perl ;)
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