go runtime_error ai_generated true

panic：sync：WaitGroup 在上一次 Wait 返回前被重用

panic: sync: WaitGroup is reused before previous Wait has returned

ID: go/panic-waitgroup-misuse-add-inside-goroutine

其他格式: JSON · Markdown 中文 · English
80%修复率
88%置信度
0证据数
2024-08-22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

在 wg.Wait 返回后又调用 wg.Add，或 Add 在 goroutine 内与 Wait 竞态调用。

English

wg.Add is called after wg.Wait has returned, or Add is called inside a goroutine racing with Wait.

generic

解决方案

  1. 95% 成功率 
    wg.Add(len(items))
for _, it := range items {
    go func(x Item) { defer wg.Done(); process(x) }(it)
}
wg.Wait()
  2. 93% 成功率 
    g := new(errgroup.Group)
for _, it := range items {
    it := it
    g.Go(func() error { return process(it) })
}
return g.Wait()

无效尝试

常见但无效的做法:

  1. 90% 失败

    Races with Wait; Wait may observe zero counter and return early.

  2. 85% 失败

    WaitGroup is not designed for reuse until Wait returns; runtime panics.