/usr/src/linux-headers-3.13.0-126-lowlatency/block is in linux-headers-3.13.0-126-lowlatency 3.13.0-126.175.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/src/linux-headers-3.13.0-126-lowlatency/../linux-headers-3.13.0-126/block