go runtime_error ai_generated true

致命错误：并发 map 迭代和 map 写入

fatal error: concurrent map iteration and map write

ID: go/racy-map-access

其他格式: JSON · Markdown 中文 · English
80%修复率
85%置信度
0证据数
2024-10-05首次发现

版本兼容性

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

根因分析

一个 goroutine 正在迭代 map，而另一个 goroutine 正在写入该 map，导致竞态条件。

English

One goroutine is iterating over a map while another goroutine writes to it, causing a race condition.

generic

解决方案

  1. 95% 成功率 Use sync.RWMutex to protect both reads and writes 
    var mu sync.RWMutex
mu.RLock()
for k, v := range myMap { ... }
mu.RUnlock()
mu.Lock()
myMap[key] = value
mu.Unlock()
  2. 90% 成功率 Use sync.Map for concurrent-safe map operations 
    var m sync.Map
m.Store(key, value)
m.Load(key)

无效尝试

常见但无效的做法:

  1. Using a sync.Mutex only around writes 85% 失败

    Iteration also needs protection; concurrent iteration and write still race.

  2. Using a RWMutex for reads but not for iteration 80% 失败

    Iteration is a read operation but may still race with writes if not locked.