[Chicken-users] Chicken segfaults with large-ish inputs

[Sam Hardwick]

Hello everyone - I have a bug report. I'm sending it here because 
someone on #chicken told me it's ok if I'm too lazy to register to the 
bug tracker. This is my solution to exercise 1.29 in SICP:

***

(define (sum term a next b)
  (if (> a b)
      0
      (+ (term a)
         (sum term (next a) next b))))

(define (adder n) (lambda (x) (+ x n)))

(define (integral f a b n)
  (let ((h (/ (- b a) n)))
    (define (y k) (f (+ a (* k h))))
    (*
     (/ h 3)
     (+ a b
        (* 4 (sum y 1 (adder 2) (- n 1)))
        (* 2 (sum y 2 (adder 2) (- n 2)))))))

***

When I exercise it with intervals divided into up to 100000 it works 
fine, but with eg.

***

(define (cube x) (* x x x))
(integral cube 0 1 1000000)

***

I get a segfault. This is (reportedly) remedied by compiling or using 
numbers (the module or whatever it's called).

I'm using the Chicken in Debian 6.0:

Version 4.5.0
linux-unix-gnu-x86 [ manyargs dload ptables ]
compiled 2010-06-17 on biber (Linux)

Although other people had the same problem on very recent versions as 
well (many other Scheme implementations also barf, some more elegantly, 
some less).

I'm not subscribed, so if you want to ask me anything, please reply to 
me directly.

Thanks,
Sam Hardwick