*** This bug is a duplicate of bug 1322407 ***
https://bugs.launchpad.net/bugs/1322407
I am having this issue as well.
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https://bugs.launchpad.net/bugs/1322406
Title:
NFS kernel server creates a kworker with 100% CPU usage, then hangs
randomly
Status in “linux” package in Ubuntu:
Confirmed
Bug description:
This concerns the server edition of 14.04. I have set up a NFS server.
Once I attach at least one client, one kworker process starts to use
100% CPU. The runaway kworker returns to idle when I reset the NFS
server daemon with "service nfs-kernel-server stop" followed by
"service nfs-kernel-server start". With the nfs kernel server stopped,
the CPU remains idle. With the nfs kernel server running, as soon as
one client requests a connection, the kworker process jumps to 100%
CPU again.
After some random time, the nfs kernel server no longer accepts
requests from clients. Restarting the service allows clients to
reconnect. The syslog shows no relevant information.
Configration: The svcgssd is not running. I played with various
configurations (enabling/disabling NFSv3 and NFSv4), but it makes no
difference.
I tried to nable event debugging:
#> echo workqueue:workqueue_queue_work > /sys/kernel/debug/tracing/set_event
#> cat /sys/kernel/debug/tracing/trace_pipe > /var/tmp/kerntrace.txt
and found the following kernel trace in a tight loop:
[...]
kworker/2:1-86 [002] d... 161940.910668: workqueue_queue_work: work
struct=ffff8804140675e0 function=xs_tcp_setup_socket [sunrpc]
workqueue=ffff8800cfbb6a00 req_cpu=256 cpu=2
kworker/2:1-86 [002] d.s. 161940.910674: workqueue_queue_work: work
struct=ffff8800cef9f488 function=rpc_async_schedule [sunrpc]
workqueue=ffff8800cfbb6a00 req_cpu=256 cpu=2
kworker/2:1-86 [002] d... 161940.910675: workqueue_queue_work: work
struct=ffff8804140675e0 function=xs_tcp_setup_socket [sunrpc]
workqueue=ffff8800cfbb6a00 req_cpu=256 cpu=2
kworker/2:1-86 [002] d.s. 161940.910681: workqueue_queue_work: work
struct=ffff8800cef9f488 function=rpc_async_schedule [sunrpc]
workqueue=ffff8800cfbb6a00 req_cpu=256 cpu=2
kworker/2:1-86 [002] d... 161940.910682: workqueue_queue_work: work
struct=ffff8804140675e0 function=xs_tcp_setup_socket [sunrpc]
workqueue=ffff8800cfbb6a00 req_cpu=256 cpu=2
kworker/2:1-86 [002] d.s. 161940.910688: workqueue_queue_work: work
struct=ffff8800cef9f488 function=rpc_async_schedule [sunrpc]
workqueue=ffff8800cfbb6a00 req_cpu=256 cpu=2
kworker/2:1-86 [002] d... 161940.910689: workqueue_queue_work: work
struct=ffff8804140675e0 function=xs_tcp_setup_socket [sunrpc]
workqueue=ffff8800cfbb6a00 req_cpu=256 cpu=2
kworker/2:1-86 [002] d.s. 161940.910695: workqueue_queue_work: work
struct=ffff8800cef9f488 function=rpc_async_schedule [sunrpc]
workqueue=ffff8800cfbb6a00 req_cpu=256 cpu=2
kworker/2:1-86 [002] d... 161940.910696: workqueue_queue_work: work
struct=ffff8804140675e0 function=xs_tcp_setup_socket [sunrpc]
workqueue=ffff8800cfbb6a00 req_cpu=256 cpu=2
kworker/2:1-86 [002] d.s. 161940.910702: workqueue_queue_work: work
struct=ffff8800cef9f488 function=rpc_async_schedule [sunrpc]
workqueue=ffff8800cfbb6a00 req_cpu=256 cpu=2
[...]
At present, I have to consider NFS fubar.
Thanks,
Mark
ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: linux-image-3.13.0-24-generic 3.13.0-24.47
ProcVersionSignature: Ubuntu 3.13.0-24.47-generic 3.13.9
Uname: Linux 3.13.0-24-generic x86_64
AlsaVersion: Advanced Linux Sound Architecture Driver Version
k3.13.0-24-generic.
AplayDevices: Error: [Errno 2] No such file or directory: 'aplay'
ApportVersion: 2.14.1-0ubuntu3.1
Architecture: amd64
ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord'
AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/by-path',
'/dev/snd/controlC0', '/dev/snd/hwC0D0', '/dev/snd/pcmC0D0c',
'/dev/snd/pcmC0D0p', '/dev/snd/pcmC0D1p', '/dev/snd/pcmC0D2c', '/dev/snd/seq',
'/dev/snd/timer'] failed with exit code 1:
CRDA: Error: [Errno 2] No such file or directory: 'iw'
Card0.Amixer.info: Error: [Errno 2] No such file or directory: 'amixer'
Card0.Amixer.values: Error: [Errno 2] No such file or directory: 'amixer'
Date: Thu May 22 22:48:48 2014
HibernationDevice: RESUME=UUID=adcdeef5-9b46-4ea4-b9f4-b6e642ea91e8
InstallationDate: Installed on 2014-05-12 (10 days ago)
InstallationMedia: Ubuntu-Server 14.04 LTS "Trusty Tahr" - Release amd64
(20140416.2)
IwConfig:
eth0 no wireless extensions.
lo no wireless extensions.
MachineType: Gigabyte Technology Co., Ltd. GA-990XA-UD3
ProcEnviron:
TERM=xterm
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=en_US.UTF-8
SHELL=/bin/bash
ProcFB: 0 nouveaufb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-24-generic
root=UUID=6cf411b3-3e8e-41e5-8670-db14ad259f58 ro IOMMU=soft nomdmonddf
nomdmonisw
RelatedPackageVersions:
linux-restricted-modules-3.13.0-24-generic N/A
linux-backports-modules-3.13.0-24-generic N/A
linux-firmware 1.127.2
RfKill: Error: [Errno 2] No such file or directory: 'rfkill'
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
WifiSyslog:
dmi.bios.date: 10/13/2011
dmi.bios.vendor: Award Software International, Inc.
dmi.bios.version: F9
dmi.board.name: GA-990XA-UD3
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.:bvrF9:bd10/13/2011:svnGigabyteTechnologyCo.,Ltd.:pnGA-990XA-UD3:pvr:rvnGigabyteTechnologyCo.,Ltd.:rnGA-990XA-UD3:rvrx.x:cvnGigabyteTechnologyCo.,Ltd.:ct3:cvr:
dmi.product.name: GA-990XA-UD3
dmi.sys.vendor: Gigabyte Technology Co., Ltd.
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