Properly getting parent and children process pids from a linux kernel - c

Question

I have used linux for a few months now, and just recently got acquainted with LKM. I have a small module (or program) that is supposed to print the parent and children's pid for every process running, however, I keep getting negative values for children's pids which I don't think is a valid value for a pid.
So far this is what I have:
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/sched.h>
#include <linux/printk.h>
#include <linux/list.h>
#include <linux/sched/signal.h>
int mod_init(void){
struct task_struct *task;
struct list_head *cursor;
struct task_struct *child;
printk(KERN_INFO "Custom mod Loaded");
for_each_process(task) {
printk(KERN_INFO "Parent %d \n", task->pid);
list_for_each(cursor, &task->children) {
child = list_entry(cursor, struct task_struct, children);
printk(KERN_INFO "\t Child %s | PID: %d \n", child->comm, child->pid);
}
}
return 0;
}
void mod_exit(void){
printk(KERN_INFO "Custom mod loaded");
}
module_init( mod_init );
module_exit( mod_exit );
MODULE_DESCRIPTION("Trying not to be a noob, and failing hard");
MODULE_AUTHOR("jlarator");
MODULE_LICENSE("GPL");
this is the make file
obj-m += mod.o
all:
make -C /lib/modules/$(shell uname -r)/build M=$(PWD) modules
clean:
make -C /lib/modules/$(shell uname -r)/build M=$(PWD) clean
This is what some of the output looks like
when I insert the module, and then call dmesg
[ 3835.687212] Parent 2029
[ 3835.687213] Child | PID: -1903591424
[ 3835.687214] Child | PID: -1903591424
[ 3835.687215] Child | PID: -1903591424
From this I can tell that I am missing something big, my main concern is why am I getting negative numbers.