Public bug reported:
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.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1318116
Title:
kworker uses 100% CPU when nfs-kernel-server is active
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