Recursion problem while using GMP

[Emre Sevinc]

Hi,

I have a problem with calling the same function within itself (even at 
the first step)
when the the function includes one of the mpz_set functions. For example
look at my (dummy, just for problem demonstration) IsPrime function below:

int IsPrime(mpz_t N)
{
static int recursion = 0;
mpz_t R, R_1, Q, ROP, ONE, HUNDRED, temp2, ROP2;
 ... a few other variable declarations

mpf_t log_N;
... a few other variable declarations

mpz_init (temp2);
... a few other variable initializations

/*mpz_set_str (R, "2", 10);*/
/*mpz_set_ui(R, (unsigned int) 2);*/
/*mpz_set_str (ONE, "1", 10); */

printf("Recursion depth = %d\n", recursion);

if ( recursion > 5 )
{
    return 1;
}
else
{
    recursion++;
    mpz_sub_ui(N, N, (unsigned int) 1);
    IsPrime(N);
}
}

This version works without any problems and calls itself 5 times but if 
I just comment out
one of the mpz_set functions and run the program  receive :

    0 [main] a 2636 open_stackdumpfile: Dumping stack trace to 
a.exe.stackdump

Segmentation fault (core dumped)

However, as you may see another GMP library function like mpz_sub_ui 
works without
any problems.

Is it impossible to use recursion when using the GMP mpz_set functions? 
Am I doing
something wrong?

I need recursion, calling the same function within itself because of the 
Indian Primality
algorithm includes a recursion in itself (5. line of the algorithm).

I'll be really glad if somebody out there can enlighten me.

Thanks in advance.