selftests/bpf: Validate multiple ref release_on_unlock logic

Modify list_push_pop_multiple to alloc and insert nodes 2-at-a-time.
Without the previous patch's fix, this block of code:

  bpf_spin_lock(lock);
  bpf_list_push_front(head, &f[i]->node);
  bpf_list_push_front(head, &f[i + 1]->node);
  bpf_spin_unlock(lock);

would fail check_reference_leak check as release_on_unlock logic would miss
a ref that should've been released.
Signed-off-by: Dave Marchevsky <davemarchevsky@fb.com>
cc: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Acked-by: Yonghong Song <yhs@fb.com>
Link: https://lore.kernel.org/r/20221201183406.1203621-2-davemarchevsky@fb.comSigned-off-by: Alexei Starovoitov <ast@kernel.org>

tools/testing/selftests/bpf/progs/linked_list.c

@@ -99,13 +99,28 @@ int list_push_pop_multiple(struct bpf_spin_lock *lock, struct bpf_list_head *hea
 	struct foo *f[8], *pf;
 	int i;
 
-	for (i = 0; i < ARRAY_SIZE(f); i++) {
+	/* Loop following this check adds nodes 2-at-a-time in order to
+	 * validate multiple release_on_unlock release logic
+	 */
+	if (ARRAY_SIZE(f) % 2)
+		return 10;
+
+	for (i = 0; i < ARRAY_SIZE(f); i += 2) {
 		f[i] = bpf_obj_new(typeof(**f));
 		if (!f[i])
 			return 2;
 		f[i]->data = i;
+
+		f[i + 1] = bpf_obj_new(typeof(**f));
+		if (!f[i + 1]) {
+			bpf_obj_drop(f[i]);
+			return 9;
+		}
+		f[i + 1]->data = i + 1;
+
 		bpf_spin_lock(lock);
 		bpf_list_push_front(head, &f[i]->node);
+		bpf_list_push_front(head, &f[i + 1]->node);
 		bpf_spin_unlock(lock);
 	}