void push(int x) {
        s1.push(x);
        while(!s1.empty()){
            s2.push(s1.top());
            s1.pop();
        }
        s1 = s2;
        while(!s2.empty()){
            s2.pop();
        }
        
    }

Look at the above function. I am implementing queue using stack. While running this, I am getting the following error

Line 176: Char 16: runtime error: reference binding to misaligned address 0xbebebebebebec0ba for type ‘int’, which requires 4 byte alignment (stl_deque.h)
0xbebebebebebec0ba: note: pointer points here

SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior /usr/bin/../lib/gcc/x86_64-linux-gnu/11/../../../../include/c++/11/bits/stl_deque.h:181:16

Could anyone please tell what’s wrong with the code ?

I expected the above stack to function like a queue.