Excessive CPU usage every 58 seconds

Bug #2012149 reported by Timothy Krause
This bug affects 1 person
Affects Status Importance Assigned to Milestone
udev (Ubuntu)

Bug Description

After the system has been running for several hours the CPU usage spikes approximately every 58 seconds. I ran 'top' and noticed that systemd and dbus were using the CPU. I then ran 'dbus-monitor --system' and saw a large stream of messages corresponding to the CPU consumption. I've attached the output of 'dbus-monitor' with the bug report. The output represents about 8 seconds of monitoring and it is over 3M. If you look at it you'll notice that it is mostly the same message from several diskseq devices referring to /sys/devices/pci0000:00/0000:00:02.4/0000:01:00.0/usb4/4-1/4-1:1.0/host10/target10:0:0/10:0:0:0/block/sdc
  The output of 'systemctl list-units' references the same device and notes that it is a memory card reader.

ProblemType: Bug
DistroRelease: Ubuntu 22.10
Package: udev 251.4-1ubuntu7.1
ProcVersionSignature: Ubuntu 5.19.0-35.36-generic 5.19.17
Uname: Linux 5.19.0-35-generic x86_64
ApportVersion: 2.23.1-0ubuntu3
Architecture: amd64
CasperMD5CheckResult: unknown
CurrentDesktop: ubuntu:GNOME
CustomUdevRuleFiles: 70-snap.snapd-desktop-integration.rules rtl-sdr.rules 70-snap.gedit.rules 70-snap.core.rules 70-snap.snap-store.rules 70-snap.gimp.rules 70-snap.gnome-clocks.rules 70-snap.firefox.rules
Date: Sat Mar 18 12:40:09 2023
InstallationDate: Installed on 2020-01-22 (1150 days ago)
InstallationMedia: Ubuntu 19.10 "Eoan Ermine" - Release amd64 (20191017)
MachineType: HP HP Pavilion Desktop PC 570-p0xx
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.19.0-35-generic root=UUID=acff58a0-5af3-4b02-8865-72bc014e551c ro quiet splash vt.handoff=7
SourcePackage: systemd
UpgradeStatus: Upgraded to kinetic on 2023-02-25 (20 days ago)
dmi.bios.date: 10/30/2017
dmi.bios.release: 5.12
dmi.bios.vendor: AMI
dmi.bios.version: F.20
dmi.board.asset.tag: CNV7500FYH
dmi.board.name: 82FE
dmi.board.vendor: HP
dmi.board.version: 11
dmi.chassis.asset.tag: CNV7500FYH
dmi.chassis.type: 3
dmi.chassis.vendor: HP
dmi.modalias: dmi:bvnAMI:bvrF.20:bd10/30/2017:br5.12:svnHP:pnHPPavilionDesktopPC570-p0xx:pvr:rvnHP:rn82FE:rvr11:cvnHP:ct3:cvr:skuZ5P18AA#ABL:
dmi.product.family: 103C_53311M HP Pavilion
dmi.product.name: HP Pavilion Desktop PC 570-p0xx
dmi.product.sku: Z5P18AA#ABL
dmi.sys.vendor: HP

Revision history for this message
Timothy Krause (tmkrs4482) wrote :
description: updated
affects: ubuntu → udev (Ubuntu)
summary: - Excessive CPU usage every 9 seconds
+ Excessive CPU usage every 58 seconds
description: updated
description: updated
Revision history for this message
Timothy Krause (tmkrs4482) wrote :

There is also output from 'udevadm monitor'. I've added an attachment for the output.

Revision history for this message
Timothy Krause (tmkrs4482) wrote :

To get more information on the devices I used 'systemctl list-units'. I've attached the output from that. The device referenced in the other attachments appears to be a memory card reader.

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