GCC Segfault in function template with thread_local variable within internal structure

Perhaps best to get to the code:

#include <iostream>
#include <vector>

using namespace std;

struct A {
    template <typename T>
    void foo(T& f) {
        struct auto_logger {
            ~auto_logger() {
                static thread_local vector<char> b; // Segfault here
            }
        } inst;
    }
};

int main(void) {
    A a;
    vector<char> b;
    a.foo(b);
}

The above code (which I think is valid?) compiles okay if foo() is not a template, however as it stands, this causes GCC to segfault. Probably is a compiler bug - but would like to know if I'm doing something wrong?

The idea is I want to execute something always when that function exits (even with an exception - unless there's a better way?)

I tested on coliru and locally with 5.2.1... Seems to compile fine on clang though.