go runtime_error ai_generated true

fatal error: sync: RUnlock of unlocked RWMutex

ID: go/rwmutex-unlock-of-unlocked

Also available as: JSON · Markdown · 中文
80%Fix Rate
86%Confidence
0Evidence
2024-10-05First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
1.18 active — — —
1.21 active — — —
1.22 active — — —

Root Cause

RUnlock() is called without a matching RLock(), often because the lock was acquired with Lock() but released with RUnlock().

generic

中文

在没有对应 RLock() 的情况下调用 RUnlock()，常见于用 Lock() 加锁却用 RUnlock() 解锁的情况。

Workarounds

  1. 94% success 
    mu.RLock()
defer mu.RUnlock()
// read-only section
  2. 85% success 
    type RLocked struct{ mu *sync.RWMutex }
func (r RLocked) Unlock() { r.mu.RUnlock() }

Dead Ends

Common approaches that don't work:

  1. 80% fail

    Hides the panic but leaves the RWMutex in a corrupted state, causing deadlocks later.

  2. 55% fail

    It removes read concurrency and may mask but not fix the mismatched lock/unlock pairs.