chenBright commented on PR #3053:
URL: https://github.com/apache/brpc/pull/3053#issuecomment-3182592138
```shell
bthread1 bthread2
bthread_sem_timedwait
rwlock->reader_count->fetch_add(RWLockMaxReaders);
bthread_sem_post_n
bthread_mutex_unlock
rwlock->reader_count->fetch_add
```
In this case, `reader_sema` has been posted. Subsequently, there may be a
problem where the write lock and read lock enter the critical section at the
same time.
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