docker - centos7：kernel:unregister_netdevice:

Question

用ssh登录centos主机，过一会儿会自动出现以下信息：

[root@i1234567890 ~]# 
Message from syslogd@i1234567890 at Mar 23 22:45:52 ...
 kernel:unregister_netdevice: waiting for lo to become free. Usage count = 1

在这个信息中，我这里按ctrl+c可以退回到[root@i1234567890 ~]# 提示符。想问问这个信息是什么意思？

百度了一下，好像遇到此问题的人挺多：
http://serverfault.com/questions/650377/linux-kernel-bug-w-netns-and-or-xen-guest-unregister-netdevice-waiting-for
https://github.com/docker/docker/issues/5618
但从两个帖子中没看到解决办法，只说这是bug？

操作系统信息如下：

发行版本：

[root@i1234567890 ~]# lsb_release -a
LSB Version:    :core-4.1-amd64:core-4.1-noarch:cxx-4.1-amd64:cxx-4.1-noarch:desktop-4.1-amd64:desktop-4.1-noarch:languages-4.1-amd64:languages-4.1-noarch:printing-4.1-amd64:printing-4.1-noarch
Distributor ID:    CentOS
Description:    CentOS Linux release 7.2.1511 (Core) 
Release:    7.2.1511
Codename:    Core

内核版本：

[root@i1234567890 ~]# uname -a
Linux i1234567890 4.4.5-1.el7.elrepo.x86_64 #1 SMP Thu Mar 10 11:45:51 EST 2016 x86_64 x86_64 x86_64 GNU/Linux

好像跟Docker有关，Docker版本：

[root@i1234567890 ~]# docker version  
Client:
 Version:      1.10.3
 API version:  1.22
 Go version:   go1.5.3
 Git commit:   20f81dd
 Built:        Thu Mar 10 15:39:25 2016
 OS/Arch:      linux/amd64

Server:
 Version:      1.10.3
 API version:  1.22
 Go version:   go1.5.3
 Git commit:   20f81dd
 Built:        Thu Mar 10 15:39:25 2016
 OS/Arch:      linux/amd64