Comment 75 for bug 1759836

When I boot up every day without exception, my machine starts up with one of the CPU cores running at 100%. I see lots of posts on other forums (Unbuntu etc) going back over a year or more blaming touchpads or nvidia or WiFi. Some even say they can't use their thumb drive if it isn't plugged in when they boot. The problem also mimics a defective thumb drive where you plug it in and Ubuntu doesn't see it (because systemd-udevd doesn't have the cycles to process the newly plugged in USB device). Losing one core makes my machine slower but not too noticeably so. I do see much longer boot times and sometime it will hang entirely during boot. I assume a single core or dual core machine will be drastically slowed down or even unusable. When I search I find other non-ubuntu os's complaining about similar problems.

I have 18.10 running on my Dell studio XPS with an AMD® Phenom(tm) ii x4 945 processor × 4 and AMD® Juniper graphics. It's a quad-core 64 bit machine. I have wireless mouse and keyboard for Logitech. I have a pretty vanilla set-up. I DO NOT have a touchpad or nvidia or WiFi!

I can verify that the problem can be managed by stopping and starting systemd-udevd. I used the following commands, suggested in this bug report, in sequence in the terminal which corrects the problem until I boot again.

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

Also the problem will "sometimes" re-appear by plugging in a thumb drive!

This is a serious kernel problem and can manifest its presence in a number of ways depending on your hardware configuration.

This is a very very very annoying problem will someone PLEASE fix it soon! ...did I mention that this is a serious problem impacting many people!