This also seems to apply to already-compiled binaries, e.g. if I compile the aforementioned testcase with libstdc++6 version 4.8.0-7, which results in correct output, and then upgrade libstdc++6 to version 4.8.0-8, re-running the testcase without recompilation results in faulty output. So since this affects unrelated binaries making use of std::chrono, without requiring recompilation, I guess the impact of this bug is quite a bit higher...