Description of problem: 
rpc.nfsd from nfs-utils 1.3.3 refused to start on the first call, but starts on the second. 

How reproducible:
Always

Steps to Reproduce:

# /usr/sbin/rpc.nfsd -d 8
rpc.nfsd: knfsd is currently down
rpc.nfsd: Writing version string to kernel: -2 +3 +4 
rpc.nfsd: Creating AF_INET TCP socket.
rpc.nfsd: Creating AF_INET UDP socket.
rpc.nfsd: Creating AF_INET6 TCP socket.
rpc.nfsd: address family AF_INET6 not supported by protocol TCP
rpc.nfsd: unable to set any sockets for nfsd

# pgrep -c nfsd 
0

# /usr/sbin/rpc.nfsd -d 8
rpc.nfsd: knfsd is currently up

# pgrep -c nfsd 
10


Additional info:
Works with nfs-utils 1.3.2 and seems to be related to commit 2f8a60200f4cc599bb421eb22de3212488d28701. If I revert the commit, rpc.nfsd starts on the first call again.

System: up-to-date CRUX 3.1