systemd-udevd eats cpu in infinite loop when nvidia card is not plugged

[Gaétan QUENTIN]

i have a roaming ssd disk ubuntu 18.04 with proprietaty nvidia drivers installed from ubuntu thid party repository:

ii nvidia-cuda-dev 9.1.85-3ubuntu1 amd64 NVIDIA CUDA development files
ii nvidia-cuda-doc 9.1.85-3ubuntu1 all NVIDIA CUDA and OpenCL documentation
ii nvidia-cuda-gdb 9.1.85-3ubuntu1 amd64 NVIDIA CUDA Debugger (GDB)
ii nvidia-cuda-toolkit 9.1.85-3ubuntu1 amd64 NVIDIA CUDA development toolkit
ii nvidia-dkms-396 396.24-0ubuntu0~gpu18.04.1 amd64 NVIDIA DKMS package
ii nvidia-kernel-common-396 396.24-0ubuntu0~gpu18.04.1 amd64 Shared files used with the kernel module
ii nvidia-kernel-source-396 396.24-0ubuntu0~gpu18.04.1 amd64 NVIDIA kernel source package
ii nvidia-profiler 9.1.85-3ubuntu1 amd64 NVIDIA Profiler for CUDA and OpenCL
ii nvidia-settings 396.24-0ubuntu0~gpu18.04.1 amd64 Tool for configuring the NVIDIA graphics driver
ii nvidia-visual-profiler 9.1.85-3ubuntu1 amd64 NVIDIA Visual Profiler for CUDA and OpenCL
r

When i boot on my nvidia system , no problem.

when i boot on other system , with other card, systemd-udevd eats lots cpu (nearby 100% or little more) and in logs i see infinite loop logging:

Jun 2 11:23:16 localhost [19963]: failed to execute '/usr/bin/nvidia-smi' '/usr/bin/nvidia-smi': No such file or directory
Jun 2 11:23:16 localhost systemd-udevd[492]: Process '/usr/bin/nvidia-smi' failed with exit code 2.
Jun 2 11:23:16 localhost systemd[1]: nvidia-persistenced.service: Start request repeated too quickly.
Jun 2 11:23:16 localhost systemd[1]: nvidia-persistenced.service: Failed with result 'exit-code'.
Jun 2 11:23:16 localhost systemd[1]: Failed to start NVIDIA Persistence Daemon.
Jun 2 11:23:16 localhost kernel: [ 2227.682538] nvidia-nvlink: Nvlink Core is being initialized, major device number 241
Jun 2 11:23:16 localhost kernel: [ 2227.682917] NVRM: No NVIDIA graphics adapter found!
Jun 2 11:23:16 localhost kernel: [ 2227.683149] nvidia-nvlink: Unregistered the Nvlink Core, major device number 241
Jun 2 11:23:16 localhost systemd-udevd[492]: Process '/sbin/modprobe nvidia-modeset' failed with exit code 1.
Jun 2 11:23:16 localhost kernel: [ 2227.756646] nvidia-nvlink: Nvlink Core is being initialized, major device number 241
Jun 2 11:23:16 localhost kernel: [ 2227.756971] NVRM: No NVIDIA graphics adapter found!
Jun 2 11:23:16 localhost kernel: [ 2227.757149] nvidia-nvlink: Unregistered the Nvlink Core, major device number 241
Jun 2 11:23:16 localhost systemd-udevd[492]: Process '/sbin/modprobe nvidia-drm' failed with exit code 1.
Jun 2 11:23:16 localhost kernel: [ 2227.824072] nvidia-nvlink: Nvlink Core is being initialized, major device number 241
Jun 2 11:23:16 localhost kernel: [ 2227.824383] NVRM: No NVIDIA graphics adapter found!
Jun 2 11:23:16 localhost kernel: [ 2227.824596] nvidia-nvlink: Unregistered the Nvlink Core, major device number 241
Jun 2 11:23:16 localhost systemd-udevd[492]: Process '/sbin/modprobe nvidia-uvm' failed with exit code 1.
Jun 2 11:23:16 localhost [19972]: failed to execute '/usr/bin/nvidia-smi' '/usr/bin/nvidia-smi': No such file or directory
Jun 2 11:23:16 localhost systemd-udevd[492]: Process '/usr/bin/nvidia-smi' failed with exit code 2.
Jun 2 11:23:16 localhost systemd[1]: nvidia-persistenced.service: Start request repeated too quickly.
Jun 2 11:23:16 localhost systemd[1]: nvidia-persistenced.service: Failed with result 'exit-code'.
Jun 2 11:23:16 localhost systemd[1]: Failed to start NVIDIA Persistence Daemon.

the nvidia-uvm module is listed in /etc/modules.

# /etc/modules: kernel modules to load at boot time.
#
# This file contains the names of kernel modules that should be loaded
# at boot time, one per line. Lines beginning with "#" are ignored.
nvidia-uvm

it should just fail at boot time and do nothing else.

when stopping systemd-udevd and starting it again, the problem disappear.

i hadn't this problem with ubuntu 16.X/17.X.
 it may be a nvidia driver/software pb too, so i will do a bug report on nvidia driver too.

Regards

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: udev 237-3ubuntu10
ProcVersionSignature: Ubuntu 4.15.0-22.24-generic 4.15.17
Uname: Linux 4.15.0-22-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.1
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
CustomUdevRuleFiles: 60-vlan-network-interface.rules 70-snap.core.rules
Date: Sat Jun 2 11:16:41 2018
EcryptfsInUse: Yes
InstallationDate: Installed on 2017-04-25 (402 days ago)
InstallationMedia: Ubuntu 17.04 "Zesty Zapus" - Release amd64 (20170412)
MachineType: GIGABYTE MRHM3AP
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=fr_FR.UTF-8
 SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.15.0-22-generic root=UUID=9ed36b5d-9fea-4544-b33c-a7c75c2cdfa5 ro rootflags=subvol=@ disablemodules=nouveau pci=noaer elevator=noop net.ifnames=0 ipv6.disable=1 quiet splash vt.handoff=1
SourcePackage: systemd
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 01/29/2014
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: F7
dmi.board.asset.tag: To be filled by O.E.M.
dmi.board.name: MRHM3AP
dmi.board.vendor: GIGABYTE
dmi.board.version: To be filled by O.E.M.
dmi.chassis.asset.tag: To Be Filled By O.E.M.
dmi.chassis.type: 3
dmi.chassis.vendor: To Be Filled By O.E.M.
dmi.chassis.version: To Be Filled By O.E.M.
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrF7:bd01/29/2014:svnGIGABYTE:pnMRHM3AP:pvrTobefilledbyO.E.M.:rvnGIGABYTE:rnMRHM3AP:rvrTobefilledbyO.E.M.:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.:
dmi.product.family: To be filled by O.E.M.
dmi.product.name: MRHM3AP
dmi.product.version: To be filled by O.E.M.
dmi.sys.vendor: GIGABYTE

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Dan Streetman (ddstreet)]

please reopen if this is still an issue