go runtime_error ai_generated true

恐慌：运行时错误：向已关闭的通道发送数据（上下文取消）

panic: runtime error: send on closed channel (context cancellation)

ID: go/context-cancellation-ignore

其他格式: JSON · Markdown 中文 · English
80%修复率
87%置信度
0证据数
2024-09-10首次发现

版本兼容性

版本状态引入弃用备注
1.7 active — — —
1.23 active — — —

根因分析

当上下文被取消时，其通道被关闭；向其发送数据会导致恐慌。

English

When a context is cancelled, its channel is closed; sending on it causes a panic.

generic

解决方案

  1. 95% 成功率 Use select with context.Done() to avoid sending on closed channel 
    select {
case ch <- data:
case <-ctx.Done():
    return ctx.Err()
}
  2. 90% 成功率 Create a new channel for each operation and close it safely 
    ch := make(chan int, 1)
select {
case ch <- data:
case <-ctx.Done():
    close(ch)
    return ctx.Err()
}

无效尝试

常见但无效的做法:

  1. Checking context.Err() before send but not handling race condition 70% 失败

    Context can be cancelled between check and send.

  2. Using a separate channel that is not closed on cancellation 60% 失败

    Ignores the cancellation signal, leading to resource leaks.