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[Bug 1452614] Re: Kworker using 100% CPU

To: kernel-packages@xxxxxxxxxxxxxxxxxxx
From: "Christopher M. Penalver" <christopher.m.penalver@xxxxxxxxx>
Date: Thu, 07 May 2015 10:09:41 -0000
Reply-to: Bug 1452614 <1452614@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx
Luis Alberto Pabón, thank you for reporting this and helping make Ubuntu
better. As per http://support.ts.fujitsu.com/Download/ShowFiles.asp an
update to your computer's buggy and outdated BIOS is available (1.18).
If you update to this following
https://help.ubuntu.com/community/BIOSUpdate does it change anything?

If it doesn't, could you please both specify what happened, and provide the output of the following terminal command:
sudo dmidecode -s bios-version && sudo dmidecode -s bios-release-date

For more on BIOS updates and linux, please see
https://help.ubuntu.com/community/ReportingBugs#Bug_reporting_etiquette
.

Please note your current BIOS is already in the Bug Description, so
posting this on the old BIOS would not be helpful. As well, you don't
have to create a new bug report.

Once the BIOS is updated, and the information above is provided, then
please mark this report Status Confirmed.

Thank you for your understanding.

** Tags added: bios-outdated-1.18

** Description changed:

  On a fresh vivid install, the kworker process is using a constant 100%
- of one of 4 virtual cores. I can work around this issue by following the
- following guide: http://askubuntu.com/questions/176565/why-does-kworker-
- cpu-usage-get-so-high and it's the same issue as in #1087010
+ of one of 4 virtual cores. This also happened on 13.10, I had to apply
+ the same workaround back then.
  
- GPE13.
- 
- This also happened on 13.10, I had to apply the same workaround back
- then.
+ WORKAROUND:  http://askubuntu.com/questions/176565/why-does-kworker-cpu-
+ usage-get-so-high
  
  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: linux-image-3.19.0-16-generic 3.19.0-16.16
  ProcVersionSignature: Ubuntu 3.19.0-16.16-generic 3.19.3
  Uname: Linux 3.19.0-16-generic x86_64
  ApportVersion: 2.17.2-0ubuntu1
  Architecture: amd64
  AudioDevicesInUse:
-  USER        PID ACCESS COMMAND
-  /dev/snd/controlC1:  development   2513 F.... pulseaudio
-  /dev/snd/controlC0:  development   2513 F.... pulseaudio
+  USER        PID ACCESS COMMAND
+  /dev/snd/controlC1:  development   2513 F.... pulseaudio
+  /dev/snd/controlC0:  development   2513 F.... pulseaudio
  Date: Thu May  7 09:32:33 2015
  HibernationDevice: RESUME=UUID=4083aed8-20c6-481f-8a0d-f43f7f15131b
  InstallationDate: Installed on 2015-05-01 (5 days ago)
  InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
  MachineType: FUJITSU LIFEBOOK A544
  ProcEnviron:
-  LANGUAGE=en_GB:en
-  TERM=xterm
-  PATH=(custom, no user)
-  LANG=en_GB.UTF-8
-  SHELL=/bin/bash
+  LANGUAGE=en_GB:en
+  TERM=xterm
+  PATH=(custom, no user)
+  LANG=en_GB.UTF-8
+  SHELL=/bin/bash
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.19.0-16-generic.efi.signed root=UUID=de8c8d39-7ff8-49e5-b4ff-3bb08f1bf5ce ro noprompt quiet splash intel_pstate=disable vt.handoff=7
  PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No PulseAudio daemon running, or not running as session daemon.
  RelatedPackageVersions:
-  linux-restricted-modules-3.19.0-16-generic N/A
-  linux-backports-modules-3.19.0-16-generic  N/A
-  linux-firmware                             1.143
+  linux-restricted-modules-3.19.0-16-generic N/A
+  linux-backports-modules-3.19.0-16-generic  N/A
+  linux-firmware                             1.143
  SourcePackage: linux
  UdevLog: Error: [Errno 2] No such file or directory: '/var/log/udev'
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 10/03/2013
  dmi.bios.vendor: FUJITSU // Phoenix Technologies Ltd.
  dmi.bios.version: Version 1.10
  dmi.board.name: FJNBB35
  dmi.board.vendor: FUJITSU
  dmi.chassis.type: 10
  dmi.chassis.vendor: FUJITSU
  dmi.modalias: dmi:bvnFUJITSU//PhoenixTechnologiesLtd.:bvrVersion1.10:bd10/03/2013:svnFUJITSU:pnLIFEBOOKA544:pvr:rvnFUJITSU:rnFJNBB35:rvr:cvnFUJITSU:ct10:cvr:
  dmi.product.name: LIFEBOOK A544
  dmi.sys.vendor: FUJITSU

** Changed in: linux (Ubuntu)
   Importance: Undecided => Low

** Changed in: linux (Ubuntu)
       Status: Confirmed => Incomplete

-- 
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https://bugs.launchpad.net/bugs/1452614

Title:
  Kworker using 100% CPU

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  On a fresh vivid install, the kworker process is using a constant 100%
  of one of 4 virtual cores. This also happened on 13.10, I had to apply
  the same workaround back then.

  WORKAROUND:  http://askubuntu.com/questions/176565/why-does-kworker-
  cpu-usage-get-so-high

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: linux-image-3.19.0-16-generic 3.19.0-16.16
  ProcVersionSignature: Ubuntu 3.19.0-16.16-generic 3.19.3
  Uname: Linux 3.19.0-16-generic x86_64
  ApportVersion: 2.17.2-0ubuntu1
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  development   2513 F.... pulseaudio
   /dev/snd/controlC0:  development   2513 F.... pulseaudio
  Date: Thu May  7 09:32:33 2015
  HibernationDevice: RESUME=UUID=4083aed8-20c6-481f-8a0d-f43f7f15131b
  InstallationDate: Installed on 2015-05-01 (5 days ago)
  InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
  MachineType: FUJITSU LIFEBOOK A544
  ProcEnviron:
   LANGUAGE=en_GB:en
   TERM=xterm
   PATH=(custom, no user)
   LANG=en_GB.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.19.0-16-generic.efi.signed root=UUID=de8c8d39-7ff8-49e5-b4ff-3bb08f1bf5ce ro noprompt quiet splash intel_pstate=disable vt.handoff=7
  PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No PulseAudio daemon running, or not running as session daemon.
  RelatedPackageVersions:
   linux-restricted-modules-3.19.0-16-generic N/A
   linux-backports-modules-3.19.0-16-generic  N/A
   linux-firmware                             1.143
  SourcePackage: linux
  UdevLog: Error: [Errno 2] No such file or directory: '/var/log/udev'
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 10/03/2013
  dmi.bios.vendor: FUJITSU // Phoenix Technologies Ltd.
  dmi.bios.version: Version 1.10
  dmi.board.name: FJNBB35
  dmi.board.vendor: FUJITSU
  dmi.chassis.type: 10
  dmi.chassis.vendor: FUJITSU
  dmi.modalias: dmi:bvnFUJITSU//PhoenixTechnologiesLtd.:bvrVersion1.10:bd10/03/2013:svnFUJITSU:pnLIFEBOOKA544:pvr:rvnFUJITSU:rnFJNBB35:rvr:cvnFUJITSU:ct10:cvr:
  dmi.product.name: LIFEBOOK A544
  dmi.sys.vendor: FUJITSU

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References

[Bug 1452614] [NEW] Kworker using 100% CPU
From: Luis Alberto Pabón, 2015-05-07