go runtime_error ai_generated true

fatal error: 并发读取和写入 map

fatal error: concurrent map read and map write

ID: go/map-concurrent-read-write

其他格式: JSON · Markdown 中文 · English
80%修复率
90%置信度
0证据数
2024-05-02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

一个 goroutine 读取 map 的同时另一个 goroutine 写入该 map，且无同步，运行时检测到冲突并中止。

English

One goroutine reads a map while another writes it, without synchronization. The runtime detects the conflict and aborts.

generic

解决方案

  1. 94% 成功率 
    mu.RLock()
v := m[key]
mu.RUnlock()
  2. 88% 成功率 
    type req struct{ key string; resp chan int }
for r := range reqs {
    r.resp <- m[r.key]
}

无效尝试

常见但无效的做法:

  1. 75% 失败

    Copying itself iterates the map and races with concurrent writes, triggering the same fatal error.

  2. 85% 失败

    Unlocked reads still race with locked writes; the detector fires on read/write overlap.