[Bug 1759836] Re: systemd-udevd consumes 100% of CPU

[Jón Bjarni Bjarnason]

Sorry for the late reply. Here comes the output:
KERNEL[90619.640204] remove   /module/nvidia (module)
UDEV  [90619.659490] add      /kernel/slab/:0012288 (slab)
KERNEL[90619.696504] add      /module/nvidia (module)
KERNEL[90619.697757] add      /kernel/slab/:0012288 (slab)
KERNEL[90619.697792] add      /bus/pci/drivers/nvidia-nvswitch (drivers)
KERNEL[90619.698144] remove   /bus/pci/drivers/nvidia-nvswitch (drivers)
UDEV  [90619.734780] add      /bus/pci/drivers/nvidia-nvswitch (drivers)
KERNEL[90619.760125] remove   /kernel/slab/:0012288 (slab)
KERNEL[90619.780134] remove   /module/nvidia (module)
UDEV  [90619.799634] add      /module/nvidia (module)
UDEV  [90619.863581] remove   /module/nvidia (module)
UDEV  [90619.914399] remove   /bus/pci/drivers/nvidia-nvswitch (drivers)
UDEV  [90619.980993] remove   /kernel/slab/:0012288 (slab)
KERNEL[90619.987727] add      /kernel/slab/:A-0000256/cgroup/filp(351529:nvidia-persistenced.service) (cgroup)
KERNEL[90619.987765] add      /kernel/slab/dentry/cgroup/dentry(351529:nvidia-persistenced.service) (cgroup)
KERNEL[90619.987787] add      /kernel/slab/inode_cache/cgroup/inode_cache(351529:nvidia-persistenced.service) (cgroup)
KERNEL[90619.987807] add      /kernel/slab/:A-0000128/cgroup/pid(351529:nvidia-persistenced.service) (cgroup)
KERNEL[90619.987827] add      /kernel/slab/sock_inode_cache/cgroup/sock_inode_cache(351529:nvidia-persistenced.service) (cgroup)
KERNEL[90619.987846] add      /kernel/slab/:A-0001024/cgroup/UNIX(351529:nvidia-persistenced.service) (cgroup)
KERNEL[90619.987873] add      /kernel/slab/skbuff_head_cache/cgroup/skbuff_head_cache(351529:nvidia-persistenced.service) (cgroup)
KERNEL[90619.987893] add      /kernel/slab/kmalloc-512/cgroup/kmalloc-512(351529:nvidia-persistenced.service) (cgroup)
KERNEL[90619.987918] add      /kernel/slab/:A-0000192/cgroup/cred_jar(351529:nvidia-persistenced.service) (cgroup)
KERNEL[90619.987938] add      /kernel/slab/mm_struct/cgroup/mm_struct(351529:nvidia-persistenced.service) (cgroup)
KERNEL[90619.987956] add      /kernel/slab/:A-0000208/cgroup/vm_area_struct(351529:nvidia-persistenced.service) (cgroup)
KERNEL[90619.988007] add      /kernel/slab/:A-0000064/cgroup/anon_vma_chain(351529:nvidia-persistenced.service) (cgroup)
KERNEL[90619.988029] add      /kernel/slab/anon_vma/cgroup/anon_vma(351529:nvidia-persistenced.service) (cgroup)
KERNEL[90619.988058] add      /kernel/slab/kmalloc-192/cgroup/kmalloc-192(351529:nvidia-persistenced.service) (cgroup)
KERNEL[90619.988076] add      /kernel/slab/kmalloc-1k/cgroup/kmalloc-1k(351529:nvidia-persistenced.service) (cgroup)
KERNEL[90619.988094] add      /kernel/slab/task_struct/cgroup/task_struct(351529:nvidia-persistenced.service) (cgroup)
KERNEL[90619.988113] add      /kernel/slab/:A-0000080/cgroup/task_delay_info(351529:nvidia-persistenced.service) (cgroup)
KERNEL[90619.988128] add      /kernel/slab/:A-0000704/cgroup/files_cache(351529:nvidia-persistenced.service) (cgroup)
KERNEL[90619.988144] add      /kernel/slab/sighand_cache/cgroup/sighand_cache(351529:nvidia-persistenced.service) (cgroup)
KERNEL[90619.988159] add      /kernel/slab/:A-0001088/cgroup/signal_cache(351529:nvidia-persistenced.service) (cgroup)
KERNEL[90619.989100] add      /kernel/slab/shmem_inode_cache/cgroup/shmem_inode_cache(351529:nvidia-persistenced.service) (cgroup)
KERNEL[90619.989133] add      /kernel/slab/:A-0000040/cgroup/pde_opener(351529:nvidia-persistenced.service) (cgroup)
KERNEL[90619.989163] add      /kernel/slab/kmalloc-4k/cgroup/kmalloc-4k(351529:nvidia-persistenced.service) (cgroup)
KERNEL[90620.018974] add      /module/nvidia (module)
KERNEL[90620.019912] add      /kernel/slab/:0012288 (slab)
KERNEL[90620.019938] add      /bus/pci/drivers/nvidia-nvswitch (drivers)
KERNEL[90620.020631] remove   /bus/pci/drivers/nvidia-nvswitch (drivers)
KERNEL[90620.080127] remove   /kernel/slab/:0012288 (slab)
KERNEL[90620.104154] remove   /module/nvidia (module)
KERNEL[90620.137366] add      /module/nvidia (module)
KERNEL[90620.138144] add      /kernel/slab/:0012288 (slab)
KERNEL[90620.138175] add      /bus/pci/drivers/nvidia-nvswitch (drivers)
KERNEL[90620.138657] remove   /bus/pci/drivers/nvidia-nvswitch (drivers)


** Attachment added: "longer log"
   https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1759836/+attachment/5287861/+files/udevd.log

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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:
  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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