golang test race (pointer is not safe neither)

race.go

package main

// ➜  race go test -race -run TestNoRace .
// ok  	_/Users/shaun.fu/test/go/race	1.288s
// ➜  race go test -race -run TestRace .

import (
	"sync"
	"testing"
)

func TestRace(t *testing.T) {
	var x = &xx{
		n: 6,
	}

	go func() {
		for {
			if x.n == 0 {
				panic("")
			}
		}
	}()

	for i := 1; i < 1e5; i++ {
		x = &xx{
			n: i,
		}
	}
}

func TestNoRace(t *testing.T) {
	var rw sync.RWMutex
	var x = &xx{
		n: 6,
	}

	go func() {
		for {
			rw.RLock()
			if x.n == 0 {
				panic("")
			}
			rw.RUnlock()
		}
	}()

	for i := 1; i < 1e5; i++ {
		rw.Lock()
		x = &xx{
			n: i,
		}
		rw.Unlock()
	}
}