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Full Discussion: Redhat nfs client hangs after 5 minutes
Operating Systems Linux Red Hat Redhat nfs client hangs after 5 minutes Post 302348464 by hpg4815 on Friday 28th of August 2009 10:10:54 AM
Old 08-28-2009
Redhat nfs client hangs after 5 minutes
New at NFS.
3 machines at hand

1 RedHat nfs Client which is connected to a spectrometer (chemistry Instrument):
Code:
[root@BH083108 ~]# uname -a
Linux BH083108 2.6.9-78.0.17.ELsmp #1 SMP Thu Mar 5 04:52:17 EST 2009 i686 i686 i386 GNU/Linux
[root@BH083108 ~]# cat /proc/version 
Linux version 2.6.9-78.0.17.ELsmp (mockbuild@hs20-bc1-5.build.redhat.com) (gcc version 3.4.6 20060404 (Red Hat 3.4.6-10)) #1 SMP Thu Mar 5 04:52:17 EST 2009
(dated kernel and OS version  on RedHat box is a requirement for the sepectrometer software)
/etc/fstab/
fs:/home /server                 nfs     rw,suid,proto=tcp               0 0
/dev/scd0               /media/cdrecorder       auto    pamconsole,exec,noauto,managed 
0 0


1 freebsd nfs client
Code:
mount_nfs -b machine_name:/home /mnt
( No issues with this nfs client at all)


1 freebsd nfs server:
Code:
FreeBSD machine_name 7.2-RELEASE FreeBSD 7.2-RELEASE #1: Wed Aug 19 14:20:21 EDT 2009     sysadm@machine_name:/usr/obj/usr/src/sys/KERNEL_FILE  amd64
/etc/exports
/home -alldirs <ip of freebsd nfs client> <ip of redhat nfs client>

From a fresh boot on nfs redhat client and freebsd nfs server, the freshly mounted redhat desktop hangs when there isn't any activity on the redhat box for roughly 5 minutes or so. Hangs on df -h or when cd to the /server mount point. /var/log/messages on the redhat client report:
Aug 27 17:37:12 localhost kernel: nfs_statfs: statfs error = 512
Aug 27 17:37:27 localhost kernel: RPC: error 512 connecting to server machine_name

there is also this error:
Code:
Aug 27 17:37:28 localhost kdesktop_lock:

Code:
redhat:
[root@BH083108 ~]# umount -f /mnt
umount2: Device or resource busy
umount: /mnt: device is busy
umount2: Device or resource busy
umount: /mnt: device is busy

DNS is good, nothing seems wrong there.

There is a auto mount setup for the cdROM

Could this be a kernel issue on the client redhat box?

Like I said works great util its not used for about 5 minutes.
Code:
[root@BH083108 /]# ps aux | grep rpc
rpcuser   3796  0.0  0.0  1688  712 ?        Ss   Aug27   0:00 rpc.statd
root      3827  0.0  0.0  5604  416 ?        Ss   Aug27   0:00 rpc.idmapd
root      4056  0.0  0.0  2540  328 ?        S    Aug27   0:00 rpc.bootparamd
root      4089  0.0  0.0  4384  232 ?        Ss   Aug27   0:00 rpc.rquotad
root      4098  0.0  0.0     0    0 ?        S    Aug27   0:00 [rpciod]
root      4106  0.0  0.0  2636  288 ?        Ss   Aug27   0:00 rpc.mountd
rpc      11678  0.0  0.0  3012  400 ?        Ss   Aug27   0:00 portmap
root     16763  0.0  0.0  3864  640 pts/4    S+   09:56   0:00 grep rpc

[root@BH083108 /]# ps aux | grep nfs
root      4093  0.0  0.0     0    0 ?        S    Aug27   0:00 [nfsd]
root      4094  0.0  0.0     0    0 ?        S    Aug27   0:00 [nfsd]
root      4095  0.0  0.0     0    0 ?        S    Aug27   0:00 [nfsd]
root      4096  0.0  0.0     0    0 ?        S    Aug27   0:00 [nfsd]
root      4099  0.0  0.0     0    0 ?        S    Aug27   0:00 [nfsd]
root      4100  0.0  0.0     0    0 ?        S    Aug27   0:00 [nfsd]
root      4101  0.0  0.0     0    0 ?        S    Aug27   0:00 [nfsd]
root      4102  0.0  0.0     0    0 ?        S    Aug27   0:00 [nfsd]

root 16765 0.0 0.0 5424 636 pts/4 S+ 09:56 0:00 grep nfs


The other client works fine all the time.

Nothing in /var/log/messages on the nfs server
 

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