slice memory leak

main.go

func main() {
	Demo1()
	runtime.GC()
	time.Sleep(1 * time.Second)
	exit()
}
func exit() {
	fmt.Println("Saving heap profile...")
	// create a  heap profile
	f, err := os.Create("heap.pprof")
	if err != nil {
		log.Fatal("could not create heap profile: ", err)
	}
	runtime.GC()
	//time.Sleep(1 * time.Second)
	//  heap profile
	if err = pprof.WriteHeapProfile(f); err != nil {
		log.Fatal("could not write heap profile: ", err)
	}
	fmt.Println("Heap profile saved in heap.pprof")
	_ = f.Close()
}

var packageStr1 []string

func Demo1() {
	for i := 0; i < 10; i++ {
		s := createStringWithLengthOnHeap(1 << 20) //1M
		packageStr1 = append(packageStr1, s[:50])
	}
}

func createStringWithLengthOnHeap(i int) string {
	s := make([]byte, i)
	for j := 0; j < i; j++ {
		s[j] = byte(j % 256 % (rand.Intn(256) + 1))
	}
	return string(s)
}