iOS应用上架被拒

在开发中遇到了下面的问题：

The app references non-public symbols : _getcontext, _makecontext, _setcontext. If method names in your source code match the private Apple APIs listed above, altering your method names will help prevent this app from being flagged in future submissions. In addition, note that one or more of the above APIs may be located in a static library that was included with your app. If so, they must be removed. If you think this message was sent in error and that you have only used Apple-published APIs in accordance with the guidelines, send the app's Apple ID, along with detailed information about why you believe the above APIs were incorrectly flagged, to appreview@apple.com.

使用私有方法被拒，但是应用并没有使用上面的哪些方法，猜测可能是一些第三方库使用了私有方法。