go runtime_error ai_generated true

WARNING: DATA RACE (goroutine write)

ID: go/goroutine-race-condition-write

Also available as: JSON · Markdown · 中文
80%Fix Rate
88%Confidence
0Evidence
2024-09-10First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
1.21 active — — —
1.22 active — — —

Root Cause

Multiple goroutines access the same variable concurrently, with at least one write, without synchronization.

generic

中文

多个协程并发访问同一变量，且至少有一个写操作，没有同步机制。

Workarounds

  1. 98% success Use sync.Mutex to protect shared variable 
    var mu sync.Mutex
var counter int
for i := 0; i < 10; i++ {
    go func() {
        mu.Lock()
        counter++
        mu.Unlock()
    }()
}
  2. 95% success Use atomic operations for simple types 
    var counter int64
for i := 0; i < 10; i++ {
    go func() {
        atomic.AddInt64(&counter, 1)
    }()
}

Dead Ends

Common approaches that don't work:

  1. Ignoring the race warning 95% fail

    Data races lead to undefined behavior, crashes, or corrupted data.

  2. Using time.Sleep to synchronize 90% fail

    Sleep does not guarantee ordering or atomicity; races persist.