[Bug 1274678] Re: Unable to lazy unmount nfsv3 when server is inaccessible

[John Gilmore]

The version of nfs-common that I found the bug in is:  nfs-
common-1:1.2.8-6ubuntu1.1 which is from the trusty-updates repository.

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Title:
  Unable to lazy unmount nfsv3 when server is inaccessible

Status in nfs-utils package in Ubuntu:
  Confirmed

Bug description:
  Afer haveing upgraded to Ubuntu 13.10 (3.11.0-15-generic) I an unable
  to unmount  nfsv3.

  Setting: My NAS is only running a few hours per day. I have a script
  mounting the NAS share when the NAS becomes available on the network.
  The script also tries to  unmount the shares when the NAS shut downs.
  This configuration was running without any problems under Ubuntu
  12.10. After upgrading to 13.10 the unmounting is not working anymore
  and the computer is even not shuting down completely. I used to mount
  "hard" without any problems now I tried "soft" but no success.
  Unmounting works perfect as long as NAS is accessible.

  
  georg at InaUbuntu:~$ mount
  ...
  192.168.1.10:/media on /mnt/NAS/media type nfs (rw,soft,intr,tcp,actimeo=3,addr=192.168.1.10)
  192.168.1.10:/backup on /mnt/NAS/backup type nfs (rw,soft,intr,tcp,actimeo=3,addr=192.168.1.10)

  
  == NAS is turned off ===

  georg at InaUbuntu:~$ lsof /mnt/NAS/backup

  "stalled"

  georg at InaUbuntu:~$ fuser -v /mnt/NAS/backup

  "stalled"

  georg at InaUbuntu:~$ sudo umount -l /mnt/NAS/backup
  [sudo] password for georg:

  "stalled"

  georg at InaUbuntu:~$ sudo umount -f /mnt/NAS/backup

  "stalled"

  georg at InaUbuntu:~$ sudo umount -l -f /mnt/NAS/backup

  "stalled"

  /Var/syslog & dmesg remains "clean", no nfs related messages

  
  georg at InaUbuntu:~$ nfsstat -m
  /mnt/NAS/backup from 192.168.1.10:/backup
   Flags:	rw,relatime,vers=3,rsize=131072,wsize=131072,namlen=255,acregmax=3,acdirmin=3,acdirmax=3,soft,proto=tcp,timeo=600,retrans=2,sec=sys,mountaddr=192.168.1.10,mountvers=3,mountport=3244,mountproto=tcp,local_lock=none,addr=192.168.1.10

  /mnt/NAS/media from 192.168.1.10:/media
   Flags:	rw,relatime,vers=3,rsize=131072,wsize=131072,namlen=255,acregmax=3,acdirmin=3,acdirmax=3,soft,proto=tcp,timeo=600,retrans=2,sec=sys,mountaddr=192.168.1.10,mountvers=3,mountport=3244,mountproto=tcp,local_lock=none,addr=192.168.1.10

  
  Any comments & help are highly appreciated. I cannot use nfs4 as it is not supported by NAS.

  Best regards,

  Georg

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