一道关于多线程的问题

一道面试题问以下代码哪里错了;
我觉得是应该先释放B再释放A,不知道是不是简单了点,请求解答.先谢谢大家帮忙了

Find, correct and explain the defect in the following code snippet.

Mutex mA;
Mutex mB;

Take(mA);
Take(mB);

DoSomething();

Release(mA);
Release(mB);