SEGV in expr.cc from small_vector.hh

[Starkeus]

Sounds good.
Seeing a segmentation fault in small_vector.hh when performing the push_back at line 167. This is creating issues at the ELF parser level.
In expr.cc, line 42:

stack.reserve(arguments.size());
for (const taddr *elt = arguments.end() - 1;
elt >= arguments.begin(); elt--)
stack.push_back(*elt); // <- The value of elt is 0xfffffffffffffff8, which means the loop should be auto, despite which the seg fault occurs.

Which uses small_vector.hh's:

void push_back(const T& x)
{
        reserve(size() + 1);
        new (end) T(x);
        end++;
}

How can I fix this and can anyone provide an ELF file they have tested with?
On my end, I also changed the loop and I threw in an expression error and I actually got "empty stack while initializing DWARF expression" multiple times. Wondering why the small_vector stack becomes empty and the seg fault happens?
stack.reserve(arguments.size());
for (auto elt = arguments.begin(); elt != arguments.end(); ++elt)
stack.push_back(*elt);
// Check if the stack is empty before using stack.back()
if (stack.empty()) {
throw expr_error("empty stack while initializing DWARF expression");
}
This also looks similar to this issue: #36