[Bug 1759836]

[jgwphd]

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!

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https://bugs.launchpad.net/bugs/1759836

Title:
  systemd-udevd consumes 100% of CPU

Status in linux:
  Confirmed
Status in The Ubuntu Power Consumption Project:
  New
Status in bluez package in Ubuntu:
  Invalid
Status in linux package in Ubuntu:
  Incomplete
Status in systemd package in Ubuntu:
  Confirmed

Bug description:
  The systemd-udevd proccess consumes 100% of a thread everytime, but
  i'm not noticing any difference in my computer.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: systemd 237-3ubuntu6
  ProcVersionSignature: Ubuntu 4.15.0-13.14-generic 4.15.10
  Uname: Linux 4.15.0-13-generic x86_64
  NonfreeKernelModules: wl
  ApportVersion: 2.20.9-0ubuntu2
  Architecture: amd64
  CurrentDesktop: ubuntu:GNOME
  Date: Thu Mar 29 08:52:54 2018
  InstallationDate: Installed on 2018-03-05 (23 days ago)
  InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Alpha amd64 (20180304)
  MachineType: Dell Inc. Inspiron N5010
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-13-generic root=UUID=3c29e292-f1ae-45e1-a0ed-a82524278ce1 ro quiet splash vt.handoff=1
  SourcePackage: systemd
  SystemdDelta:
   [EXTENDED]   /lib/systemd/system/rc-local.service → /lib/systemd/system/rc-local.service.d/debian.conf
   [EXTENDED]   /lib/systemd/system/user at .service → /lib/systemd/system/user at .service.d/timeout.conf

   2 overridden configuration files found.
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 01/25/2011
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A12
  dmi.board.name: 08R0GW
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A12
  dmi.chassis.type: 8
  dmi.chassis.vendor: Dell Inc.
  dmi.chassis.version: A12
  dmi.modalias: dmi:bvnDellInc.:bvrA12:bd01/25/2011:svnDellInc.:pnInspironN5010:pvrA12:rvnDellInc.:rn08R0GW:rvrA12:cvnDellInc.:ct8:cvrA12:
  dmi.product.name: Inspiron N5010
  dmi.product.version: A12
  dmi.sys.vendor: Dell Inc.

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