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Since I upgraded from Ubuntu 16 to 18.04, CPU usage is high. Sometimes 100% cpu usage, and when that happens we can't do anything. If we check on the process systemd-udevd, we find it is using 100% CPU. I have followed an answer to this question: Ubuntu 18.04 systemd-udevd uses high CPU, conflict with nvidia graphics but now I can't use any browser.

I ran the command sudo mv /lib/udev/rules.d/71-nvidia.rules ~ and now I can't install a new browser or use the old one, and I still have this 100% CPU issue.

Here's a detailed list of my system hardware

Note: I have installed Mint 19 version and found the same issue. I just downgraded to Mint 18.3 and CPU and memory usage are fine. Many others also reported the same issue.

I also faced the same issue after upgrade on my DELL laptop.

My workaround

Soon after booting, stopping and starting systed-udev eliminates all bind and unbind problems and response drastically improves. I used the following two commands in sequence:

sudo systemctl stop systemd-udevd systemd-udevd-kernel.socket systemd-udevd-control.socket

sudo systemctl start systemd-udevd systemd-udevd-kernel.socket systemd-udevd-control.socket

My understanding

Before all hardware is discovered properly, bind/unbind starts executing when no procedures are available and does not get reinitialized. After stopping and starting, it gets all the procedures in place. Probably, this is a boot sequence problem.

laptop Dell vostro 3300

:~$ cat /etc/lsb-release 

DISTRIB_ID=Ubuntu

DISTRIB_RELEASE=18.10

DISTRIB_CODENAME=cosmic

DISTRIB_DESCRIPTION="Ubuntu 18.10"



:~$ lscpu

Architecture:        x86_64

CPU op-mode(s):      32-bit, 64-bit

Byte Order:          Little Endian

CPU(s):              4

On-line CPU(s) list: 0-3

Thread(s) per core:  2

Core(s) per socket:  2

Socket(s):           1

NUMA node(s):        1

Vendor ID:           GenuineIntel

CPU family:          6

Model:               37

Model name:          Intel(R) Core(TM) i5 CPU       M 430  @ 2.27GHz

Stepping:            2

CPU MHz:             1570.403

CPU max MHz:         2262,0000

CPU min MHz:         1197,0000

BogoMIPS:            4521.91

Virtualization:      VT-x

L1d cache:           32K

L1i cache:           32K

L2 cache:            256K

L3 cache:            3072K

NUMA node0 CPU(s):   0-3

create file in /etc/init.d/

sudo nano /etc/init.d/systemd-udevd-solv.sh

paste -->

#!/bin/sh



sudo systemctl stop systemd-udevd systemd-udevd-kernel.socket systemd-udevd-control.socket



sleep 5



sudo systemctl start systemd-udevd systemd-udevd-kernel.socket systemd-udevd-control.socket

ctrl + x to save file and confirm exit

change permission

sudo chmod a+x /etc/init.d/systemd-udevd-solv.sh