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I know nothing of XSV, even if it is C or Python coded, so 
can only offer generic comment:  You are more likely to get 
attention of voluteer patchers if you can pinpoint the line of 
XSV code inducing the segfault.

>It works on Linux Mandrake 9.1, and segfaults
on redhat 7.2

The header lines displayed in interactive mode describing the 
respective builds might help explain.  A possible reason is a 
bug in the compiler or compilation mode (such as 
optimization) in one and not the other.

Good luck.  This is beyond my competance.