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Message #60929
[Bug 1318116] Re: kworker uses 100% CPU when nfs-kernel-server is active
** Description changed:
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]
+ 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
+ USER PID ACCESS COMMAND
+ /dev/snd/controlC1: username 4414 F.... pulseaudio
+ username 4778 F.... pulseaudio
+ /dev/snd/controlC0: username 4414 F.... pulseaudio
+ username 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.
+ 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
+ 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
+ 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.
--
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: username 4414 F.... pulseaudio
username 4778 F.... pulseaudio
/dev/snd/controlC0: username 4414 F.... pulseaudio
username 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.
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References
