go runtime_error ai_generated true

致命错误：并发读取和写入 map

fatal error: concurrent map read and map write

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

其他格式: JSON · Markdown 中文 · English
80%修复率
90%置信度
0证据数
2024-03-19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 读取 map 的同时另一个 goroutine 写入该 map。运行时的 map 竞争检测器触发并导致进程崩溃。

English

One goroutine reads a map while another writes it. The runtime's map race detector fires and crashes the process.

generic

解决方案

  1. 95% 成功率 
    Use sync.RWMutex: mu.RLock() for reads, mu.Lock() for writes; ensure reads also hold the lock
  2. 85% 成功率 
    Pass map snapshots through channels so only one goroutine owns the map

无效尝试

常见但无效的做法:

  1. 90% 失败

    Reads racing writes still trigger the fatal error

  2. 85% 失败

    The copy itself iterates the map while it is being written, still racing