go resource_error ai_generated true

goroutine 泄漏：runtime.NumGoroutine() 无限增长；pprof 显示 goroutine 阻塞在 chan send

goroutine leak: runtime.NumGoroutine() grows unbounded; pprof shows goroutines blocked in chan send

ID: go/goroutine-leak-runtime-numgoroutine-grows-unbounded-ppro

其他格式: JSON · Markdown 中文 · English

80%修复率

85%置信度

0证据数

2024-08-27首次发现

版本兼容性

版本	状态	引入	弃用	备注
1.19	active	—	—	—
1.21	active	—	—	—
1.23	active	—	—	—

根因分析

生产者 goroutine 因消费者提前返回（错误/超时）而永久阻塞在无缓冲 channel 的发送上，且无人再消费该 channel。

English

Producer goroutines block forever on an unbuffered channel because the consumer returned early (error/timeout) and nobody drains the channel.

generic

解决方案

95% 成功率

go func() {
    defer close(out)
    for _, x := range items {
        select {
        case out <- x:
        case <-ctx.Done():
            return
        }
    }
}()

88% 成功率
```
defer func() {
    for range out {}
}()
```

无效尝试

常见但无效的做法:

80% 失败
Delays the leak; once the buffer fills under sustained load the goroutines block again.
95% 失败
GC does not collect blocked goroutines; they remain referenced by the scheduler.