# 致命错误：并发写入 map

- **ID:** `go/panic-concurrent-map-write`
- **领域:** go
- **类别:** runtime_error
- **验证级别:** ai_generated
- **修复率:** 80%

## 根因

两个 goroutine 在无同步的情况下同时修改同一个 map，运行时检测到竞态并中止。

## 版本兼容性

| 版本 | 状态 | 引入 | 弃用 |
|------|------|------|------|
| 1.0+ | active | — | — |

## 解决方案

1. **** (90% 成功率)
   ```
   var m sync.Map
m.Store("k", 1)
v, _ := m.Load("k")
   ```
2. **** (95% 成功率)
   ```
   var mu sync.RWMutex
mu.Lock()
m[k] = v
mu.Unlock()
   ```

## 无效尝试

- **** — Narrows the race window but does not eliminate it; still fatal under load. (85% 失败率)
- **** — atomic.Value requires whole-value replacement; concurrent in-place writes still race. (80% 失败率)