go runtime_error ai_generated true

panic: 向已关闭的 channel 发送数据（在 select 语句中）

panic: send on closed channel (inside select statement)

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

其他格式: JSON · Markdown 中文 · English
80%修复率
88%置信度
0证据数
2024-05-01首次发现

版本兼容性

版本状态引入弃用备注
1.18 active — — —
1.22 active — — —

根因分析

select 的某个 case 尝试向已被其他 goroutine 关闭的 channel 发送数据，尽管通常认为 select 能保护发送操作。

English

A select case attempts to send on a channel that has been closed by another goroutine, even though select is often assumed to protect sends.

generic

解决方案

  1. 90% 成功率 
    select {
case ch <- v:
case <-done:
    return
}
  2. 92% 成功率 
    // only the owner closes; producers send via a request channel

无效尝试

常见但无效的做法:

  1. 90% 失败

    default does not prevent the panic when the send case is selected and the channel is closed.

  2. 85% 失败

    Buffering delays but does not prevent the panic; a closed channel rejects all sends regardless of buffer.