kernel:unregister_netdevice: waiting for lo to become free. Usage count = 1
用ssh登录阿里云centos7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
写回答
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kernel:unregister_netdevice: waiting for lo to become free. Usage count = 1
SOLUTION VERIFIED - Updated July 6 2017 at 10:42 AM - English
Environment
Red Hat Enterprise Linux 7.4 or earlier
TCP connection over loopback interface lo
Issue
kernel:unregister_netdevice: waiting for lo to become free. Usage count = 1
Above message is logged constantly on console or in dmesg or /var/log/messages file or in systemd journal
Resolution
Update to RHEL 7.5 when available.Root Cause
A bug resulted in the loopback device having a reference count which was increased but never decreased.This was resolved by upstream patch tcp: reset sk_rx_dst in tcp_disconnect() in Linux Kernel v4.12 and backported to RHEL 7.5 on Red Hat Private Bug 1467770.
Diagnostic Steps
Use the reproducer described at unregister_netdevice: waiting for lo to become free. Usage count = 1Run it in a netns once and delete the netns:
Raw
make tcp-bug
ip netns add test1
ip netns exec test1 ip link set dev lo up
ip netns exec test1 ./tcp-bug
ip netns del test1
In the error condition kernel:unregister_netdevice: waiting for lo to become free. Usage count = 1 is printed on console and in dmesg.In the working condition, no error is printed and the netns is successfully deleted.
2019-07-17 18:35:32赞同 展开评论 打赏 -
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我也遇到一样的问题，
$ cat /etc/os-release NAME="Ubuntu" VERSION="14.04.5 LTS, Trusty Tahr" ID=ubuntu ID_LIKE=debian PRETTY_NAME="Ubuntu 14.04.5 LTS" VERSION_ID="14.04" HOME_URL="http://www.ubuntu.com/" SUPPORT_URL="http://help.ubuntu.com/" BUG_REPORT_URL="http://bugs.launchpad.net/ubuntu/" $ uname -a Linux yt-imd-03 4.4.0-46-generic #67~14.04.1-Ubuntu SMP Fri Oct 21 16:04:40 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux $ docker --version Docker version 1.12.2, build bb80604内存很快被撑满，然后无法ssh上去，系统就挂住了，使用web 控制打开，报这个错
2019-07-17 18:35:32赞同 展开评论 打赏 -
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