go runtime_error ai_generated true

panic：向已关闭的 channel 发送数据

panic: send on closed channel

ID: go/panic-send-on-closed-channel

其他格式: JSON · Markdown 中文 · English
80%修复率
90%置信度
0证据数
2024-03-11首次发现

版本兼容性

版本状态引入弃用备注
1.0+ active — — —

根因分析

某个 goroutine 在另一个 goroutine 调用 close() 之后仍向该 channel 发送数据，违反了单一关闭者/关闭后不发送的规则。

English

A goroutine sends on a channel after another goroutine called close() on it, violating the single-closer / no-send-after-close rule.

generic

解决方案

  1. 95% 成功率 
    done := make(chan struct{})
go func() {
    for {
        select {
        case <-done:
            return
        case ch <- v:
        }
    }
}()
  2. 88% 成功率 
    mu.Lock()
if !closed {
    ch <- v
}
mu.Unlock()

无效尝试

常见但无效的做法:

  1. 85% 失败

    Recover only protects the current goroutine; other senders still panic and the channel remains closed.

  2. 90% 失败

    len() is racy; the channel can be closed between the check and the send.