I couldn't get it to reproduce on a VM (VirtualBox) either. I'm wondering if the SSE-optimized version of the glibc doesn't work the same way in a VM as it does on host hardware (i.e. SSE instructions are virtualized to some degree). Since the hardware doesn't support it, the library falls back to a version that won't trigger the bug.

(Again, this is just an unconfirmed theory.)