Bug#907308: Bug depends on glibc version

[Daniel Lange]

as discussed with jwilk on irc:

This bug depends on the (g)libc version:

* stock Stretch is unaffected (libc6-2.24-11+deb9u3)
* Stretch with glibc from unstable (libc6-2.27-5) is affected
* stock Ubuntu 18.04.1 (libc6-2.27-3ubuntu1) is affected