go runtime_error ai_generated true

fatal error: concurrent map writes

ID: go/goroutine-race-on-map

Also available as: JSON · Markdown · 中文
80%Fix Rate
89%Confidence
0Evidence
2024-02-10First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
1.20 active — — —
1.21 active — — —

Root Cause

Multiple goroutines attempt to write to a map simultaneously without synchronization, causing a runtime panic.

generic

中文

多个 goroutine 同时尝试向 map 写入数据而没有同步，导致运行时恐慌。

Workarounds

  1. 95% success 
    var mu sync.Mutex; mu.Lock(); myMap[key] = value; mu.Unlock()
  2. 90% success 
    var sm sync.Map; sm.Store(key, value)

Dead Ends

Common approaches that don't work:

  1. 55% fail

    If not correctly implemented, channel can still cause races or deadlocks.

  2. 90% fail

    Race condition persists; timing is unreliable.