Comment 7 for bug 1246802

I can also reproduce with something this simple:

        std::vector<int> v = {
                207089,
                202585,
                180067,
                157549,
                211592,
                216096,
                207089
        };

-D_GLIBCXX_DEBUG reveals that we are dereferencing a past-the-end iterator. We badly need a quick fix. Say 2-3 day max or we have to revert the fix for 58437.