loop-bound does not work for nested while loop

[Muqi-Zou]

looks like "bound=1" does not work on following code:

int test6(int input,int input2){
    int temp3;
    temp3 = 1;
    while(input < 120){
        temp3 = temp3+ 1;
        input = input - 1;

        while(input2 < 120){
            temp3 = temp3+ 1;
            input2 = input2 - 1;

        }
    }
    return temp3;
}

You may run pypy3 angr_running.py ./test_whileloop 0 test6 to check it. bug_loop_bound.zip

[Muqi-Zou]

Btw, a few issues here: 1. It looks like the order of successors from the loop_seer is reversed, I mean not the same as what it is without "bound=1"

2. For the nested forloop (function test4 in the test_whileloop.c), though angr terminates, I do not think it terminates at the correct position, i.e., when bound=1, angr terminates the explored state after executing the same branch instruction third times, which should be twice.

[Muqi-Zou]

I may find the issue there, we may need a handler to handle exits is null.