[Bug 1759836] Re: systemd-udevd consumes 100% of CPU due to hid2hci udev rule from bluez

[Dan Streetman]

> Sorry for the late reply. Here comes the output:
> KERNEL[90619.640204] remove /module/nvidia (module)
> KERNEL[90619.696504] add /module/nvidia (module)

ok, your problem is that something is constantly adding and removing the
nvidia module (and, doing other related device processing).  That has
nothing to do with this bug's problem, which is ONLY for udev looping
due to rules in the bluez package's hid2hci rules file.  I updated the
bug subject to clarify that (scanning back through all the comments, I
think most if not all of the discussion focuses on this specific package
and rule).

You do seem to be having some other problem, which probably is with the
nvidia-persistenced.service, provided by the nvidia-compute-utils-NNN
package (with NNN being a number).  Check:

$ dpkg -l | grep nvidia

to see the specific package name/version on your system.  I don't really
know what the problem is there, but you could try removing the package
(if you don't need it), or searching for and/or opening a new bug for
the problem.

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

Title:
  systemd-udevd consumes 100% of CPU due to hid2hci udev rule from bluez

Status in linux:
  Confirmed
Status in The Ubuntu Power Consumption Project:
  New
Status in bluez package in Ubuntu:
  In Progress
Status in linux package in Ubuntu:
  Invalid
Status in systemd package in Ubuntu:
  Invalid
Status in bluez package in Debian:
  New

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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