Loading a shared object library - c

Question

I have this little program that I took from some example around the web:
#include <stdio.h>
#include <stdlib.h>
#include <dlfcn.h>
int
main(int argc, char **argv)
{
void *handle;
double (*cosine)(double);
char *error;
handle = dlopen("libzapi_v2.so.1", RTLD_LAZY);
if (!handle) {
printf("no handle \n");
fprintf(stderr, "%s\n", dlerror());
exit(EXIT_FAILURE);
}
dlerror(); /* Clear any existing error */
/* Writing: cosine = (double (*)(double)) dlsym(handle, "cos");
would seem more natural, but the C99 standard leaves
casting from "void *" to a function pointer undefined.
The assignment used below is the POSIX.1-2003 (Technical
Corrigendum 1) workaround; see the Rationale for the
POSIX specification of dlsym(). */
fprintf(stderr, "handle is here \n");
*(void **) (&cosine) = dlsym(handle, "cos");
if ((error = dlerror()) != NULL) {
fprintf(stderr, "%s\n", error);
exit(EXIT_FAILURE);
}
printf("%f\n", (*cosine)(2.0));
dlclose(handle);
exit(EXIT_SUCCESS);
}
I compile it with gcc -rdynamic -o np np.c and then when I run with ./np
I get the following error:
ld-elf.so.1: assert failed: /usr/src/libexec/rtld-elf/rtld.c:1046
Abort (core dumped)
I search and searched for people with similar issues, but can't find anything. Can anyone offer some troubleshooting suggestions ?
This is on latest freebsd.