RPC messages in logs after disabling IPv6

Environment

• Red Hat Enterprise Linux 10
• Red Hat Enterprise Linux 9
• Red Hat Enterprise Linux 8
• Red Hat Enterprise Linux 7
• nfs-utils

Issue

• After disabling IPv6 by adding ipv6.disable=1 boot parameter, the following message was output in /var/log/messages.

  rpc.statd[PID]: Failed to create listener xprt (statd, 1, udp6)
  rpc.statd[PID]: Failed to create listener xprt (statd, 1, tcp6)
  

Resolution

• The messages are just a warning and they can be ignored.

• If you do not want messages displayed in the logs, edit the file /etc/netconfig and modify the entries for udp6 and tcp6:

  ## udp6       tpi_clts      v     inet6    udp     -       -
  ## tcp6       tpi_cots_ord  v     inet6    tcp     -       -
  udp6          tpi_clts      -     inet6    udp     -       -
  tcp6          tpi_cots_ord  -     inet6    tcp     -       -
  

Root Cause

• These messages are a side effect of an Content from git.linux-nfs.org is not included.upstream commit that was merged in the kernel to help debugging rpcbind failures, by making sure that all errors would be logged.

Diagnostic Steps

• Disable the IPv6 protocol and reboot the system.

• Once the system is up again, start the rpc-statd service:

  # systemctl start rpc-statd
  

• Check the logs and look for the Failed to create listener xprt messages:

  # journalctl --unit=rpc-statd
  May 27 01:38:32 localhost.localdomain systemd[1]: Starting rpc-statd.service - NFS status monitor for NFSv2/3 locking....
  May 27 01:38:32 localhost.localdomain rpc.statd[1787]: Version 2.8.2 starting
  May 27 01:38:32 localhost.localdomain rpc.statd[1787]: Flags: TI-RPC
  May 27 01:38:32 localhost.localdomain rpc.statd[1787]: Initializing NSM state
  May 27 01:38:32 localhost.localdomain rpc.statd[1787]: Failed to create listener xprt (statd, 1, udp6)
  May 27 01:38:32 localhost.localdomain rpc.statd[1787]: Failed to create listener xprt (statd, 1, tcp6)
  May 27 01:38:32 localhost.localdomain systemd[1]: Started rpc-statd.service - NFS status monitor for NFSv2/3 locking..
  

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