我加了锁，可还是报错。
fatal error: concurrent map iteration and map write
这是为何呢？百度的各种方法也都试了，都不行。
```go
package main
import (
"fmt"
"sync"
)
func main() {
var counter = struct{
sync.RWMutex
m map[string]int
}{m: make(map[string]int)}
for i := 0; i < 2; i++ {
go func() {
for j := 0; j < 1000000; j++ {
counter.Lock()
counter.m["some_key"]++
counter.Unlock()
}
}()
}
fmt.Println(counter)
}
```
所有崩溃都可以很容易在崩溃后打印的调用堆栈里面找到原因
fatal error: concurrent map iteration and map write
goroutine 7 [running]:
runtime.throw(0x4aae87, 0x26)
/usr/local/go/src/runtime/panic.go:596 +0x95 fp=0xc42003a840 sp=0xc42003a820
runtime.mapiternext(0xc420086060)
/usr/local/go/src/runtime/hashmap.go:737 +0x7ee fp=0xc42003a8f0 sp=0xc42003a840
reflect.mapiternext(0xc420086060)
/usr/local/go/src/runtime/hashmap.go:1156 +0x2b fp=0xc42003a908 sp=0xc42003a8f0
reflect.Value.MapKeys(0x490200, 0xc42007a078, 0xb5, 0x0, 0x76, 0x2)
/usr/local/go/src/reflect/value.go:1112 +0x1bc fp=0xc42003a9b8 sp=0xc42003a908
fmt.(*pp).printValue(0xc420082000, 0x490200, 0xc42007a078, 0xb5, 0x76, 0x1)
/usr/local/go/src/fmt/print.go:741 +0xedf fp=0xc42003abb0 sp=0xc42003a9b8
fmt.(*pp).printValue(0xc420082000, 0x492c40, 0xc42007a060, 0x99, 0x76, 0x0)
/usr/local/go/src/fmt/print.go:778 +0x21de fp=0xc42003ada8 sp=0xc42003abb0
fmt.(*pp).printArg(0xc420082000, 0x492c40, 0xc42007a060, 0x76)
/usr/local/go/src/fmt/print.go:682 +0x217 fp=0xc42003ae30 sp=0xc42003ada8
fmt.(*pp).doPrintln(0xc420082000, 0xc42003af98, 0x1, 0x1)
/usr/local/go/src/fmt/print.go:1138 +0xa1 fp=0xc42003aea8 sp=0xc42003ae30
fmt.Fprintln(0x4f7160, 0xc42000c018, 0xc42003af98, 0x1, 0x1, 0xc42007a060, 0xc42003afa8, 0xc42007a060)
/usr/local/go/src/fmt/print.go:247 +0x5c fp=0xc42003af10 sp=0xc42003aea8
fmt.Println(0xc42003af98, 0x1, 0x1, 0xc42007a060, 0x0, 0x0)
/usr/local/go/src/fmt/print.go:257 +0x57 fp=0xc42003af60 sp=0xc42003af10
main.main.func2(0xc42000a1a0)
/home/marlon/projects/t.go:26 +0xb1 fp=0xc42003afd8 sp=0xc42003af60
runtime.goexit()
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