go runtime_error ai_generated true

恐慌：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
85%置信度
0证据数
2024-02-10首次发现

版本兼容性

版本状态引入弃用备注
1.0 active — — —
1.21 active — — —

根因分析

调用 Done() 的次数多于 Add() 的次数，导致计数器减到负数。

English

Calling Done() more times than Add() was called, decrementing counter below zero.

generic

解决方案

  1. 95% 成功率 Ensure Add() is called exactly once per goroutine that will call Done() 
    var wg sync.WaitGroup
for i := 0; i < n; i++ {
    wg.Add(1)
    go func() { defer wg.Done(); work() }()
}
wg.Wait()
  2. 90% 成功率 Use defer wg.Done() immediately after wg.Add() in the goroutine 
    go func() { defer wg.Done(); ... }()

无效尝试

常见但无效的做法:

  1. Increasing Add() count arbitrarily 85% 失败

    If Done() is called extra times, the counter still goes negative.

  2. Ignoring the panic and continuing 100% 失败

    Panic stops execution; ignoring it is not possible.