golang 的 data race 示例，没太理解

代码：

package main
func main() {
	c := make(chan bool)
	m := make(map[string]string)
	go func() {
		m["1"] = "a" // First conflicting access.
		c <- true
	}()
	m["2"] = "b" // Second conflicting access.
	<-c
	for k, v := range m {
		fmt.Println(k, v)
	}
}

执行 go run -race test.go,结果为

WARNING: DATA RACE
Write at 0x00c00011c180 by goroutine 7:
  runtime.mapassign_faststr()
      /usr/local/Cellar/go/1.18/libexec/src/runtime/map_faststr.go:203 +0x0
  main.main.func1()
      /Users/admin/Downloads/test.go:9 +0x50

Previous write at 0x00c00011c180 by main goroutine:
  runtime.mapassign_faststr()
      /usr/local/Cellar/go/1.18/libexec/src/runtime/map_faststr.go:203 +0x0
  main.main()
      /Users/admin/Downloads/test.go:12 +0x127

Goroutine 7 (running) created at:
  main.main()
      /Users/admin/Downloads/test.go:8 +0x10a
==================
1 a
2 b
Found 1 data race(s)
exit status 66

官方文档： https://go.dev/doc/articles/race_detector

大概了解了一下 Memory Model ，还有 CPU 的乱序执行什么的，对这个例子还是不太理解，有没有大佬指点一二。