No documentation for process "kworker"

Hi klausner,

Please be sure to confirm this issue exists with the latest development release of Ubuntu. ISO CD images are available from http://cdimage.ubuntu.com/daily/current/ . If the issue remains, please run the following command from a Terminal (Applications->Accessories->Terminal). It will automatically gather and attach updated debug information to this report.

apport-collect -p linux 700335

Also, if you could test the latest upstream kernel available that would be great. It will allow additional upstream developers to examine the issue. Refer to https://wiki.ubuntu.com/KernelMainlineBuilds . Once you've tested the upstream kernel, please remove the 'needs-upstream-testing' tag. This can be done by clicking on the yellow pencil icon next to the tag located at the bottom of the bug description and deleting the 'needs-upstream-testing' text. Please let us know your results.

Thanks in advance.

    [This is an automated message. Apologies if it has reached you inappropriately; please just reply to this message indicating so.]

Currently with a fresh install of 11.04 AMD64 I have over 90 instances of kworker running, mostly sleeping. Why? What possible use is this undocumented process?

Same problem cpu only goes 100% while on battery

 Linux mdclinux 2.6.38-8-generic #42-Ubuntu SMP Mon Apr 11 03:31:24 UTC 2011 x86_64 x86_64 x86_64 GNU/Linux

hardware Dell Latitude E6500 4gb memory

any debug needed test please ask happy to help

[Expired for linux (Ubuntu) because there has been no activity for 60 days.]

in this thread:

http://ubuntuforums.org/showthread.php?s=ad014bb3386aef40fcb3b4ae44473cfa&t=1630347&page=4

It seems either to do witk kernel queing of processes or acpi stuff - in any case kernel stuff which seems to bug quite a lot of people of all distros using newer kernels, and it does not seem to be fixed...

Still, because its unclear to me what kworker really does some documentation of the process would be nice.

kworker seems to be related to ACPI.

The bug affects also to Linus Torvalds: http://lkml.org/lkml/2010/8/15/111

Some issues related:
- high cpu usage
- usb mouse & keyboard freeze
- random hangs

AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.23.
Architecture: amd64
ArecordDevices:
 **** List of CAPTURE Hardware Devices ****
 card 0: Intel [HDA Intel], device 0: STAC92xx Analog [STAC92xx Analog]
   Subdevices: 1/1
   Subdevice #0: subdevice #0
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: rockape 1826 F.... pulseaudio
CRDA: Error: [Errno 2] No such file or directory
Card0.Amixer.info:
 Card hw:0 'Intel'/'HDA Intel at 0xdd000000 irq 49'
   Mixer name : 'Nvidia MCP77/78 HDMI'
   Components : 'HDA:111d76b2,103c3610,00100302 HDA:10de0006,10de0101,00100000'
   Controls : 25
   Simple ctrls : 14
DistroRelease: Ubuntu 11.04
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release amd64 (20110427.1)
MachineType: Hewlett-Packard HP HDX18 Notebook PC
NonfreeKernelModules: nvidia
Package: linux (not installed)
ProcEnviron:
 LANGUAGE=en_US:en
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-2.6.38-13-generic root=UUID=db5a47b3-c0f9-442d-afa8-fe1bee908e63 ro quiet splash vt.handoff=7
ProcVersionSignature: Ubuntu 2.6.38-13.53-generic 2.6.38.8
RelatedPackageVersions:
 linux-restricted-modules-2.6.38-13-generic N/A
 linux-backports-modules-2.6.38-13-generic N/A
 linux-firmware 1.52.4
Tags: natty
Uname: Linux 2.6.38-13-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare
dmi.bios.date: 01/05/2008
dmi.bios.vendor: Hewlett-Packard
dmi.bios.version: F.20
dmi.board.asset.tag: Base Board Asset Tag
dmi.board.name: 3610
dmi.board.vendor: Quanta
dmi.board.version: 15.26
dmi.chassis.type: 10
dmi.chassis.vendor: Quanta
dmi.chassis.version: N/A
dmi.modalias: dmi:bvnHewlett-Packard:bvrF.20:bd01/05/2008:svnHewlett-Packard:pnHPHDX18NotebookPC:pvrRev1:rvnQuanta:rn3610:rvr15.26:cvnQuanta:ct10:cvrN/A:
dmi.product.name: HP HDX18 Notebook PC
dmi.product.version: Rev 1
dmi.sys.vendor: Hewlett-Packard

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[Expired for linux (Ubuntu) because there has been no activity for 60 days.]

Still no documentation and yet this still is big problem.

klausner, thank you for reporting this and helping make Ubuntu better. kworker, like other kernel related information, is in fact quite well documented in the Headline of the linux kernel commits. For more on the initial commit of kworker please see http://kernel.ubuntu.com/git?p=ubuntu/ubuntu-trusty.git;a=commit;h=c34056a3fdde777c079cc8a70785c2602f2586cb .

Feel free to report any future bugs you may find.