go runtime_error ai_generated true

panic: 关闭已关闭的 channel

panic: close of closed channel

ID: go/channel-close-receive-panic

其他格式: JSON · Markdown 中文 · English
80%修复率
90%置信度
0证据数
2024-05-12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

试图关闭一个已经关闭的 channel。

English

Attempting to close a channel that has already been closed.

generic

解决方案

  1. 98% 成功率 
    var once sync.Once
closeCh := func() {
    once.Do(func() { close(ch) })
}
  2. 95% 成功率 
    go func() {
    defer close(ch)
    // send values
}()

无效尝试

常见但无效的做法:

  1. 80% 失败

    Hides double-close bug, may lead to inconsistent state

  2. 70% 失败

    No built-in way to check if channel is closed without receiving