go runtime_error ai_generated true

致命错误：所有 goroutine 都处于休眠状态 - 死锁！（RWMutex 写锁）

fatal error: all goroutines are asleep - deadlock! (RWMutex write lock)

ID: go/rwmutex-write-lock-deadlock

其他格式: JSON · Markdown 中文 · English
80%修复率
85%置信度
0证据数
2024-07-10首次发现

版本兼容性

版本状态引入弃用备注
1.0 active — — —
1.21 active — — —

根因分析

持有读锁的 goroutine 尝试获取写锁，导致死锁，因为写锁需要等待所有读锁释放。

English

A goroutine holding a read lock tries to acquire a write lock, causing a deadlock because write lock waits for all read locks to release.

generic

解决方案

  1. 95% 成功率 Avoid holding read lock when acquiring write lock; release read lock first 
    rw.RUnlock()
rw.Lock()
// write
rw.Unlock()
rw.RLock() // if needed again
  2. 90% 成功率 Use a single mutex instead of RWMutex if write locks are frequent 
    var mu sync.Mutex
mu.Lock()
// write
mu.Unlock()

无效尝试

常见但无效的做法:

  1. Using a separate mutex for writes 80% 失败

    Does not address the recursive locking issue; may still deadlock.

  2. Increasing the number of goroutines 90% 失败

    More goroutines can exacerbate the deadlock.