go runtime_error ai_generated true

goroutine 阻塞在 select 上，没有就绪的 case（死锁或长时间停滞）

goroutine blocked in select with no ready case (deadlock or long stall)

ID: go/select-no-case-ready-block

其他格式: JSON · Markdown 中文 · English
80%修复率
85%置信度
0证据数
2024-12-09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

没有 default 的 select 语句会阻塞直到某个 case 可以执行。如果所有 channel 永远不会就绪，goroutine 将无限期停滞。

English

A select statement with no default blocks until one of its cases can proceed. If none of the channels ever become ready, the goroutine stalls indefinitely.

generic

解决方案

  1. 90% 成功率 
    select {
case v := <-ch:
	use(v)
case <-time.After(5 * time.Second):
	return errors.New("timeout waiting for value")
}
  2. 90% 成功率 
    select {
case v := <-ch:
	use(v)
case <-ctx.Done():
	return ctx.Err()
}

无效尝试

常见但无效的做法:

  1. 90% 失败

    A default with a loop spins the CPU at 100% and does not make any channel ready.

  2. 80% 失败

    If the channels are never written to, more cases do not help; the goroutine still blocks.