linux/tools/testing/selftests/bpf/progs/test_global_func12.c

// SPDX-License-Identifier: GPL-2.0-only
#include <stddef.h>
#include <linux/bpf.h>
#include <bpf/bpf_helpers.h>
#include "bpf_misc.h"

struct S {
	int x;
};

__noinline int foo(const struct S *s)
{
	return bpf_get_prandom_u32() < s->x;
}

SEC("cgroup_skb/ingress")
__failure __msg("invalid mem access 'mem_or_null'")
int global_func12(struct __sk_buff *skb)
{
	const struct S s = {.x = skb->len };

	foo(&s);

	return 1;
}