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This looks like a stack overflow.  There's not much python 
can do when the stack runs out of memory, which is why the 
default recursion limit is set to 1000.

Also, at least in the reproducable, the number you are building 
is going to consume excessive amounts of memory.

I ran this test (to avoid creating a giant long number) and still 
got the segfault.

from sys import *
n = 30000
setrecursionlimit(n+1)

def nofact(n):
    if n==1: 
        return 1
    return nofact(n-1)

nofact(n)