go runtime_error ai_generated true

WARNING: DATA RACE Write at 0x... by goroutine N: main.foo() Previous read at 0x... by goroutine M: main.bar()

ID: go/race-detector-warning

Also available as: JSON · Markdown · 中文
80%Fix Rate
90%Confidence
0Evidence
2024-12-01First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
1.1+ active — — —

Root Cause

Two goroutines accessed the same memory location without synchronization, at least one being a write. Detected only when built with -race.

generic

中文

两个 goroutine 在无同步的情况下访问同一内存位置，且至少有一个是写操作。仅在 -race 构建时能被检测到。

Workarounds

  1. 97% success 
    var mu sync.Mutex
mu.Lock()
counter++
mu.Unlock()
// or
atomic.AddInt64(&counter, 1)
  2. 92% success 
    for _, item := range items {
    item := item // capture by value
    go func() { process(item) }()
}

Dead Ends

Common approaches that don't work:

  1. 90% fail

    Does not create a happens-before relationship between the two accesses; race detector still fires.

  2. 95% fail

    Hides real bugs; production may corrupt data or crash non-deterministically.