In my particular scenario I am using Ubuntu 14.04. With NFS mount and AUFS. And am seeing the same result of kworker0:1 going to and staying 100%. I have tried adjusting the acpi settings to off, but this has not helped.
Rebooting the server itself does not help. I'll post any needed logs to help fixing it. Turning off nfs-server has helped. ----- I am running kernel 3.13.0-19-generic. -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1318116 Title: kworker uses 100% CPU when nfs-kernel-server is active Status in “linux” package in Ubuntu: Confirmed Bug description: I have a clean install of 14.04 on an i7-860 with 16GB RAM. I'm using NFS to share a home directory. The volume is ~2TB, formatted JFS, and it has a single client. I recently noticed that I had a [kworker] process using 100% CPU: PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 9253 root 20 0 0 0 0 R 99.9 0.0 0:30.17 [kworker/3:1] Rebooting didn't help. After some troubleshooting I found that it went away immediately when I stopped the nfs-kernel-server daemon. When I start it, it comes back after a minute or two, still using 99-100% CPU. The load goes away when the client is turned off and the NFS server is restarted, but it comes back as soon as it reconnects. The only line in /etc/exports is: /home 192.168.1.0/24(rw,sync,no_root_squash) version_signature: Ubuntu 3.13.0-24.47-generic 3.13.9 # dpkg -l nfs-kernel-server Desired=Unknown/Install/Remove/Purge/Hold | Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend |/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad) ||/ Name Version Architecture Description +++-==============-============-============-================================== ii nfs-kernel-ser 1:1.2.8-6ubu amd64 support for NFS kernel server Description: Ubuntu 14.04 LTS Release: 14.04 I don't think this is related to my hardware but I can provide lspci output if necessary. --- ApportVersion: 2.14.1-0ubuntu3 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC1: gdexter 4414 F.... pulseaudio gdexter 4778 F.... pulseaudio /dev/snd/controlC0: gdexter 4414 F.... pulseaudio gdexter 4778 F.... pulseaudio DistroRelease: Ubuntu 14.04 HibernationDevice: RESUME=UUID=de6e2d52-86c9-4867-8d37-31964953e1e6 InstallationDate: Installed on 2014-05-01 (9 days ago) InstallationMedia: Kubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140416.1) IwConfig: eth0 no wireless extensions. eth1 no wireless extensions. lo no wireless extensions. MachineType: Gigabyte Technology Co., Ltd. P55A-UD4P NonfreeKernelModules: nvidia Package: linux (not installed) ProcEnviron: TERM=xterm PATH=(custom, no user) LANG=en_US.UTF-8 SHELL=/bin/bash ProcFB: ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.13.0-24-generic root=/dev/mapper/hostname-newestroot ro quiet splash ProcVersionSignature: Ubuntu 3.13.0-24.47-generic 3.13.9 PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No PulseAudio daemon running, or not running as session daemon. RelatedPackageVersions: linux-restricted-modules-3.13.0-24-generic N/A linux-backports-modules-3.13.0-24-generic N/A linux-firmware 1.127 RfKill: Tags: trusty Uname: Linux 3.13.0-24-generic x86_64 UpgradeStatus: No upgrade log present (probably fresh install) UserGroups: _MarkForUpload: True dmi.bios.date: 10/16/2009 dmi.bios.vendor: Award Software International, Inc. dmi.bios.version: F3 dmi.board.name: P55A-UD4P dmi.board.vendor: Gigabyte Technology Co., Ltd. dmi.board.version: x.x dmi.chassis.type: 3 dmi.chassis.vendor: Gigabyte Technology Co., Ltd. dmi.modalias: dmi:bvnAwardSoftwareInternational,Inc.:bvrF3:bd10/16/2009:svnGigabyteTechnologyCo.,Ltd.:pnP55A-UD4P:pvr:rvnGigabyteTechnologyCo.,Ltd.:rnP55A-UD4P:rvrx.x:cvnGigabyteTechnologyCo.,Ltd.:ct3:cvr: dmi.product.name: P55A-UD4P dmi.sys.vendor: Gigabyte Technology Co., Ltd. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1318116/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
