go runtime_error ai_generated true

fatal error: 所有 goroutine 都处于休眠状态 - 死锁！（nil channel 接收）

fatal error: all goroutines are asleep - deadlock! (nil channel receive)

ID: go/channel-receive-from-nil-channel

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80%修复率

87%置信度

0证据数

2024-09-03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

某个 goroutine 尝试从 nil channel 接收数据，这会永久阻塞。如果所有 goroutine 都阻塞在 nil channel 上，运行时会检测到死锁。

English

A goroutine attempted to receive from a nil channel, which blocks forever. If all goroutines are blocked on nil channels, the runtime detects a deadlock.

generic

解决方案

98% 成功率

ch := make(chan int)
// or ch := make(chan int, 1)

90% 成功率

select {
case v := <-ch:
    // use v
case <-time.After(1 * time.Second):
    return errors.New("timeout: channel may be nil")
}

无效尝试

常见但无效的做法:

90% 失败
A nil channel is not the same as an uninitialized variable; you must explicitly create it with make().
85% 失败
A select with a nil channel case will block if no other case is ready; default only helps if you want non-blocking behavior.