We had this suspicion as well but it's hard to prove what might be the culprit since it's not readily reproducible. We did recently discover ImageMagick is seg-faulting when we run our app on a 64-bit OS so it's possible there may be some memory corruption going on there that doesn't result in a seg-fault on 32-bit.
I'm not sure what qualifies as "weird" XS modules but scanning through the list of .so's I don't see anything sticking out. Everything we have is pretty standard CPAN stuff. This is mod_perl (v2.0.4) and Apache (2.2.17) however, so there's lots of stuff going on in the same memory space.
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