go runtime_error ai_generated true

panic: sync: 负的 WaitGroup 计数器

panic: sync: negative WaitGroup counter

ID: go/negative-waitgroup-counter

其他格式: JSON · Markdown 中文 · English
80%修复率
88%置信度
0证据数
2024-03-11首次发现

版本兼容性

版本状态引入弃用备注
1.16+ active — — —

根因分析

wg.Done() 的调用次数多于 wg.Add()，通常发生在 goroutine 内 defer Done 且提前返回，或 Add 在 goroutine 内部调用时。

English

wg.Done() called more times than wg.Add(), commonly when Done is deferred inside a goroutine that also returns early or when Add is called inside the goroutine itself.

generic

解决方案

  1. 95% 成功率 
    wg.Add(1)
go func() {
    defer wg.Done()
    doWork()
}()
wg.Wait()
  2. 92% 成功率 
    g := new(errgroup.Group)
for _, item := range items {
    item := item
    g.Go(func() error { return process(item) })
}
if err := g.Wait(); err != nil { return err }

无效尝试

常见但无效的做法:

  1. 85% 失败

    recover cannot catch this panic reliably across goroutine boundaries and masks the real imbalance, causing the Wait() to return prematurely.

  2. 90% 失败

    The counter imbalance is structural; sleeping only changes timing and the panic still fires when Done exceeds Add.