Macos – Unknown ending signal when using debugger gdb

I have installed GDB on Mac OS X and to test that it works I have used this following C program.

#include <stdio.h>
#include <stdlib.h>

int main(int argc, char *argv[]) {

    int *my_array = (int *) malloc(5 * sizeof(int));
    int i;
    for (i = 0; i < 1000000; i++) {
        my_array[i] = i;
    }

    free(my_array);

    return 0;

}

I have an error when compiling it, which is normal (segmentation fault)

However, when adding the -g flag in the compiling command and running gdb on my compiled program, I have this message after launching the command run

During startup program terminated with signal ?, Unknown signal.

Really don't know where it comes from. I have added a certificate to ensure that gdb works correctly on OS X but I have found nothing to fix this issue.