# panic：关闭已关闭的 channel

- **ID:** `go/panic-close-of-closed-channel`
- **领域:** go
- **类别:** runtime_error
- **验证级别:** ai_generated
- **修复率:** 80%

## 根因

close(ch) 被调用多次，通常来自多条清理路径或多个 defer 关闭。

## 版本兼容性

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

## 解决方案

1. **** (95% 成功率)
   ```
   var once sync.Once
once.Do(func() { close(ch) })
   ```
2. **** (93% 成功率)
   ```
   go func() {
    defer close(ch)
    for v := range src { ch <- v }
}()
   ```

## 无效尝试

- **** — Silently swallows a logic bug; downstream consumers may still observe inconsistent state. (70% 失败率)
- **** — Multiple goroutines closing the same channel guarantees the panic. (95% 失败率)