Bug 1313480 - (nfsd) nfs server spins and has high load even with no clients connected
(nfsd) nfs server spins and has high load even with no clients connected
Status: CLOSED EOL
Product: Fedora
Classification: Fedora
Component: kernel (Show other bugs)
22
armv7l Linux
unspecified Severity high
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Assigned To: Kernel Maintainer List
Fedora Extras Quality Assurance
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Depends On:
Blocks:
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Reported: 2016-03-01 11:38 EST by Derek Atkins
Modified: 2016-07-19 15:24 EDT (History)
6 users (show)

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Doc Type: Bug Fix
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Last Closed: 2016-07-19 15:24:53 EDT
Type: Bug
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Description Derek Atkins 2016-03-01 11:38:25 EST
Description of problem:

Running Fedora-22 on an ARM Wandboard.  Trying to set up an NFS server to share a 2TB drive connected via SATA.  When the nfs servers are running at least two of them are spinning and using significant load.  This load also results in missed interrupts and reduces network capability.

This spinning happens regardless of whether anything is connected to the server.

Version-Release number of selected component (if applicable):

kernel-4.3.4-200.fc22.armv7hl
nfs-utils-1.3.3-6.rc3.fc22.armv7hl

How reproducible:

Seems to be completely reproducible on my system.  If I run:
service nfs-server start
it will start up and nfsd will start spinning.  If I run
service nfs-server stop
then it will shut down and the system will run normally.

Steps to Reproduce:
1. service nfs-server start
2.
3.

Actual results:

top - 16:19:30 up 23:36,  1 user,  load average: 2.79, 2.75, 2.66
Tasks: 118 total,   5 running, 113 sleeping,   0 stopped,   0 zombie
%Cpu(s):  0.3 us, 38.5 sy,  0.0 ni, 40.7 id,  0.0 wa,  0.0 hi, 20.6 si,  0.0 st
KiB Mem :  2064876 total,    62132 free,    73572 used,  1929172 buff/cache
KiB Swap:   249852 total,   249432 free,      420 used.  1935800 avail Mem 

  PID USER      PR  NI    VIRT    RES    SHR S  %CPU %MEM     TIME+ COMMAND     
 1024 root      20   0       0      0      0 R  77.6  0.0   1154:25 nfsd        
 1023 root      20   0       0      0      0 R  76.6  0.0   1150:27 nfsd        
    3 root      20   0       0      0      0 R  47.4  0.0 602:37.59 ksoftirqd/0 
   60 root      20   0       0      0      0 R  13.8  0.0  36:23.26 kswapd0     
  981 root      20   0  356948  29000  18440 S   4.6  1.4 158:47.23 mythbackend 
   13 root      20   0       0      0      0 S   1.0  0.0  10:25.97 ksoftirqd/1 
   18 root      20   0       0      0      0 S   1.0  0.0   9:19.12 ksoftirqd/2 
 8556 root      20   0    8908   3556   3060 R   1.0  0.2   0:00.16 top         


Expected results:

nfsd shouldn't spin.

Additional info:

/etc/exports contains:
/data   1.2.3.0/24(ro,insecure,all_squash) 192.168.1.0/24(ro,insecure,all_squash)

and I added the following to the end of /etc/sysconfig/nfs:
RPCNFSDCOUNT=2
LOCKD_TCPPORT=4001
LOCKD_UDPPORT=4001
MOUNTD_PORT=4002
STATD_PORT=4000
Comment 1 Fedora End Of Life 2016-07-19 15:24:53 EDT
Fedora 22 changed to end-of-life (EOL) status on 2016-07-19. Fedora 22 is
no longer maintained, which means that it will not receive any further
security or bug fix updates. As a result we are closing this bug.

If you can reproduce this bug against a currently maintained version of
Fedora please feel free to reopen this bug against that version. If you
are unable to reopen this bug, please file a new report against the
current release. If you experience problems, please add a comment to this
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