go runtime_error ai_generated true

致命错误：所有协程都处于睡眠状态 - 死锁！（for-select没有default）

fatal error: all goroutines are asleep - deadlock! (for-select with no default)

ID: go/goroutine-for-select-no-default

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80%修复率
84%置信度
0证据数
2025-04-18首次发现

版本兼容性

版本状态引入弃用备注
1.0 active — — —
1.20 active — — —

根因分析

一个没有default情况的for-select循环，所有通道都阻塞，导致协程永远睡眠。

English

A for-select loop with no default case and all channels blocked causes goroutine to sleep forever.

generic

解决方案

  1. 95% 成功率 Add default case to avoid blocking 
    for {
    select {
    case <-ch:
        // handle
    default:
        // non-blocking
    }
}
  2. 90% 成功率 Use a done channel to break out of loop 
    done := make(chan struct{})
for {
    select {
    case <-ch:
        // handle
    case <-done:
        return
    }
}

无效尝试

常见但无效的做法:

  1. Adding time.Sleep inside loop 90% 失败

    Sleep doesn't unblock channels; goroutine still blocked.

  2. Using break statement to exit loop 80% 失败

    Break only exits select, not for loop; goroutine re-enters select and blocks again.