go runtime_error ai_generated true

fatal error: 并发 map 迭代与 map 写入

fatal error: concurrent map iteration and map write

ID: go/concurrent-map-write-during-range

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80%修复率
90%置信度
0证据数
2024-02-27首次发现

版本兼容性

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

根因分析

一个 goroutine 正在 range 遍历 map，同时另一个 goroutine 写入同一个 map，违反了 Go 的 map 安全规则。

English

A map is being range-iterated in one goroutine while another goroutine writes to the same map, violating Go's map safety rules.

generic

解决方案

  1. 97% 成功率 
    var mu sync.RWMutex
mu.RLock()
for k, v := range m { _ = k; _ = v }
mu.RUnlock()
// writer:
mu.Lock()
m[k] = v
mu.Unlock()
  2. 90% 成功率 
    var m sync.Map
m.Range(func(k, v any) bool { return true })
m.Store(key, val)

无效尝试

常见但无效的做法:

  1. 90% 失败

    Timing-based avoidance is unreliable; the runtime can still detect concurrent access under load.

  2. 95% 失败

    This is a fatal runtime error, not a panic; recover cannot catch it and the process exits.