软件版本为v5 。如何进入隐藏模式，查询异常栈？

<H3C>sys

System View: return to User View with Ctrl+Z.

[H3C]_h

Now you enter a hidden command view for developer's testing, some commands may affect operation by wrong use, please carefully use it with our engineer's direction.

[H3C-hidecmd]

先system进系统模式，然后_hi进隐藏模式

这个最好问下专家吧，异常栈什么的需要专门分析相关代码吧