[Bugs] [Bug 1615307] New: Error disabling sockopt IPV6_V6ONLY

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1615307

            Bug ID: 1615307
           Summary: Error disabling sockopt IPV6_V6ONLY
           Product: GlusterFS
           Version: 4.1
         Component: transport
          Assignee: bugs at gluster.org
          Reporter: kompastver at gmail.com
                CC: bugs at gluster.org



Description of problem:
We're getting warnings like this:

[2018-08-13 09:38:45.428086] W [socket.c:3352:socket_connect] 0-glustershd:
Error disabling sockopt IPV6_V6ONLY: "Operation not supported"

Therefore glusterfs listen on both IPv6 and IPv6
Glusterfs compiled with --with-ipv6-default. And the server has IPv6 address.
Actually glusterfs already use socket with v6only:0:

~ $ sudo ss -ltnep | grep 24007
LISTEN     0      10          :::24007                   :::*                  
users:(("glusterd",pid=13103,fd=10)) ino:317954466 sk:f8 v6only:0 <->

~ $ sudo sysctl net.ipv6.bindv6only
net.ipv6.bindv6only = 0


Version-Release number of selected component (if applicable):
4.1.2

Steps to Reproduce:
1. assign IPv6 address for network interface
2. compile glusterfs with --with-ipv6-default option
3. setup glusterfs cluster

Actual results:
Warnings about disabling IPV6_V6ONLY for socket

Expected results:
Disable IPV6_V6ONLY for socket without errors

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