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Network Namespace Creation Failure

Last updated: 2022-04-06 20:30:26

    Problem Description

    When you create a new network namespace, the corresponding command gets stuck and does not continue. Dmesg message: "unregister_netdevice: waiting for lo to become free. Usage count = 1"

    Causes

    This problem is caused by a bug in the kernel. The following kernel versions have this bug:

    • Ubuntu 16.04 x86_32 kernel version: 4.4.0-92-generic.
    • Ubuntu 16.04 x86_32 kernel version: 4.4.0-92-generic.

    Solution

    Upgrade the kernel to version 4.4.0-98-generic. In this version, the bug has already been fixed.

    Directions

    1. Execute the following command to check the current kernel version.
    uname -r
    
    1. Execute the following command to check whether version 4.4.0-98-generic is available for upgrade.
    sudo apt-get update
    sudo apt-cache search linux-image-4.4.0-98-generic
    

    If the following information is displayed, it means this version exists in the source and is available for upgrade.

    linux-image-4.4.0-98-generic - Linux kernel image for version 4.4.0 on 64 bit x86 SMP
    
    1. Execute the following command to install the new kernel version and corresponding Header package.
    sudo apt-get install linux-image-4.4.0-98-generic linux-headers-4.4.0-98-generic
    
    1. Execute the following command to restart the system.
    sudo reboot
    
    1. Execute the following command to enter the system to check the kernel version.
    uname -r
    

    If the following result is displayed, it means the version upgrade is successful:

    4.4.0-98-generic
    
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