go runtime_error ai_generated true

fatal error: concurrent map writes

ID: go/data-race-map-concurrent-write

Also available as: JSON · Markdown · 中文
80%Fix Rate
89%Confidence
0Evidence
2024-04-03First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
1.16 active — — —
1.21 active — — —
1.22 active — — —

Root Cause

Two goroutines write to the same map without synchronization. The runtime detects concurrent writes and aborts the process.

generic

中文

两个 goroutine 在无同步的情况下写入同一个 map。运行时检测到并发写并中止进程。

Workarounds

  1. 92% success 
    var m sync.Map
m.Store(k, v)
v, ok := m.Load(k)
  2. 96% success 
    var mu sync.RWMutex
mu.Lock()
m[k] = v
mu.Unlock()

Dead Ends

Common approaches that don't work:

  1. 90% fail

    Other writes still race; the runtime aborts on the first detected concurrent pair.

  2. 85% fail

    Sleeps don't eliminate races under real load; the crash just becomes intermittent.