go runtime_error ai_generated true

致命错误：并发读 map 和写 map

fatal error: concurrent map read and map write

ID: go/concurrent-map-read-and-write

其他格式: JSON · Markdown 中文 · English
80%修复率
90%置信度
0证据数
2024-03-05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 — — —

根因分析

一个 goroutine 读 map 的同时另一个 goroutine 写同一个 map。运行时检测到这种不一致访问会终止程序。

English

One goroutine read a map while another wrote to it. The runtime's map implementation detects this inconsistent access and aborts the program.

generic

解决方案

  1. 93% 成功率 
    var mu sync.RWMutex
// writer
mu.Lock(); m[k]=v; mu.Unlock()
// reader
mu.RLock(); v := m[k]; mu.RUnlock()
  2. 85% 成功率 
    type req struct{ key string; resp chan int }
// single owner goroutine processes reqs serially

无效尝试

常见但无效的做法:

  1. 85% 失败

    Copying a map being concurrently written also races and may panic or produce corrupted data.

  2. 87% 失败

    Timing-based synchronization is unreliable and breaks under load or different GOMAXPROCS.