Comment 21 for bug 752583

I looked into this a while back, because like you Raoul, I'm running on a system with only IPv6 resolvers.

It seems to be a bug in upstream glibc, see https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=528992#44

"""
It seems that the change in submitted-resolv-ipv6-nameservers.diff[1]
is causing a regression with the mtr package (and probably other
packages).

The change in question is for statp->nscount to now only count IPv4
nameservers. This now causes mtr to fail on systems where only IPv6
nameservers are specified.
"""