go runtime_error ai_generated true

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

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

ID: go/channel-send-to-nil-channel

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
1.0+	active	—	—	—

某个 goroutine 尝试向 nil channel 发送数据，这会永久阻塞。如果没有其他 goroutine 可以继续执行，运行时会检测到死锁。

A goroutine attempted to send to a nil channel, which blocks forever. If no other goroutine can proceed, the runtime detects a deadlock.

generic

98% 成功率

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

90% 成功率

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

常见但无效的做法:

90% 失败
A nil channel in a select will never be ready, so the default case will always be taken, silently dropping the send.
85% 失败
Checking for nil is not atomic and does not guarantee the channel is initialized; it may still be nil at send time.