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/waitgroup-misuse-reused-before-wait

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80%修复率
87%置信度
0证据数
2024-07-08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

在上一次 Wait 尚未返回时（另一 goroutine）就再次 Add，违反了 Add 必须先于 Wait 的规则。

English

A WaitGroup is reused (Add called) while a previous Wait from another goroutine has not yet returned, violating the rule that Add must happen before Wait.

generic

解决方案

  1. 94% 成功率 
    Use a fresh WaitGroup per batch instead of reusing one:
for _, batch := range batches {
    var wg sync.WaitGroup
    for _, x := range batch { wg.Add(1); go func(x T){ defer wg.Done(); work(x) }(x) }
    wg.Wait()
}

无效尝试

常见但无效的做法:

  1. 85% 失败

    Timing-based synchronization is nondeterministic and the panic can still occur under load.