go runtime_error ai_generated true

fatal error: semacquire: semacquire goroutine 1 [semacquire]: sync.runtime_Semacquire(...)

ID: go/semacquire-deadlock

Also available as: JSON · Markdown · 中文
80%Fix Rate
85%Confidence
0Evidence
2024-07-09First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
1.18 active — — —
1.22 active — — —

Root Cause

A sync primitive (Mutex, WaitGroup, RWMutex) is held or waited on such that no progress is possible; runtime reports semacquire deadlock.

generic

中文

某个同步原语（Mutex、WaitGroup、RWMutex）被持有或等待，导致无法推进；运行时报告 semacquire 死锁。

Workarounds

  1. 90% success 
    // Always lock A then B, never B then A.
muA.Lock(); muB.Lock(); ...; muB.Unlock(); muA.Unlock()
  2. 80% success 
    if !mu.TryLock() {
    return errors.New("lock timeout")
}
defer mu.Unlock()

Dead Ends

Common approaches that don't work:

  1. 85% fail

    Atomics cannot express compound invariants; logic still deadlocks.

  2. 90% fail

    Does not resolve lock ordering; can still deadlock.