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[Launchpad Bug Tracker <1590799@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package nfs-utils - 1:1.2.8-9.2ubuntu2

---------------
nfs-utils (1:1.2.8-9.2ubuntu2) zesty; urgency=medium

  * Fixing nfs-mountd dependency on rpcbind (race condition) (LP: #1590799)
    by adding "rpcbind.socket" to "nfs-mountd.service"  as a dependency
    to avoid race conditions:
    - Add systemd-Fix-nfs-mountd-dependency-on-rpcbind.patch
    - Add systemd-unit-files-fix-up-dependencies-on-rpcbind.patch

 -- Rafael David Tinoco <rafael.tinoco@xxxxxxxxxxxxx>  Fri, 17 Mar 2017
12:19:53 +0100

** Changed in: nfs-utils (Ubuntu Zesty)
       Status: In Progress => Fix Released

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https://bugs.launchpad.net/bugs/1590799

Title:
  nfs-kernel-server does not start because of dependency failure

Status in nfs-utils package in Ubuntu:
  Fix Released
Status in nfs-utils source package in Xenial:
  In Progress
Status in nfs-utils source package in Yakkety:
  In Progress
Status in nfs-utils source package in Zesty:
  Fix Released

Bug description:
  [Impact]

   * nfs-mountd doesn't get started because of a race condition happening when rpcbind.socket is not specified as a needed service for it to start.
   * nfs-server using rpcbind.target instead of using rpcbind.socket. Target should not be used (Comment #24)

  [Test Case]

   * Install nfs-kernel-server inside a xenial lxc guest and restart it until nfs-mountd doesn't start complaining on rpc error.
   * Comment #25

  [Regression Potential]

   * Cons: Systemd dependencies could brake for nfs-server and nfs-mountd.
   * Pros: Patches have been accepted upstream (and tested).

  [Other Info]
   
  # Original Bug Description

  Immediately after boot:

  root@feynmann:~# systemctl status nfs-kernel-server
  ● nfs-server.service - NFS server and services
     Loaded: loaded (/lib/systemd/system/nfs-server.service; enabled; vendor preset: enabled)
     Active: inactive (dead)

  Jun 09 14:35:47 feynmann systemd[1]: Dependency failed for NFS server and services.
  Jun 09 14:35:47 feynmann systemd[1]: nfs-server.service: Job nfs-server.service/start failed

  root@feynmann:~# systemctl status nfs-mountd.service
  ● nfs-mountd.service - NFS Mount Daemon
     Loaded: loaded (/lib/systemd/system/nfs-mountd.service; static; vendor preset: enabled)
     Active: failed (Result: exit-code) since Thu 2016-06-09 14:35:47 BST; 7min ago
    Process: 1321 ExecStart=/usr/sbin/rpc.mountd $RPCMOUNTDARGS (code=exited, status=1/FAILURE)

  Jun 09 14:35:47 feynmann systemd[1]: Starting NFS Mount Daemon...
  Jun 09 14:35:47 feynmann rpc.mountd[1321]: mountd: could not create listeners
  Jun 09 14:35:47 feynmann systemd[1]: nfs-mountd.service: Control process exited, code=exited
  Jun 09 14:35:47 feynmann systemd[1]: Failed to start NFS Mount Daemon.
  Jun 09 14:35:47 feynmann systemd[1]: nfs-mountd.service: Unit entered failed state.
  Jun 09 14:35:47 feynmann systemd[1]: nfs-mountd.service: Failed with result 'exit-code'.

  root@feynmann:~# systemctl list-dependencies nfs-kernel-server
  nfs-kernel-server.service
  ● ├─auth-rpcgss-module.service
  ● ├─nfs-config.service
  ● ├─nfs-idmapd.service
  ● ├─nfs-mountd.service
  ● ├─proc-fs-nfsd.mount
  ● ├─rpc-svcgssd.service
  ● ├─system.slice
  ● ├─network.target
  ● └─rpcbind.target
  ●   └─rpcbind.service

  root@feynmann:~# systemctl list-dependencies nfs-mountd.service
  nfs-mountd.service
  ● ├─nfs-config.service
  ● ├─nfs-server.service
  ● ├─proc-fs-nfsd.mount
  ● └─system.slice
  root@feynmann:~#

  root@feynmann:~# lsb_release -rd
  Description:	Ubuntu 16.04 LTS
  Release:	16.04

  root@feynmann:~# apt-cache policy nfs-kernel-server
  nfs-kernel-server:
    Installed: 1:1.2.8-9ubuntu12
    Candidate: 1:1.2.8-9ubuntu12
    Version table:
   *** 1:1.2.8-9ubuntu12 500
          500 http://gb.archive.ubuntu.com/ubuntu xenial/main amd64 Packages
          100 /var/lib/dpkg/status

  Additional comments:

      1. There seems to be a circular dependency between nfs-mountd and nfs-kernel-server
      2. I can get it working by changing the AFter,Requires in /lib/ssystemd/system/nfs-{mountd|server}.service files. I have managed to get nfs-kernel-server to start but not nfs-mountd.
      3. /usr/lib/systemd/scripts/nfs-utils_env.sh references /etc/sysconfig/nfs which is Centos/RedHat location of this file. Also /etc/default/nfs does not exist. (possibly unrelated to this bug)
      4. A file "/lib/systemd/system/-.slice" exists. this file prevents execution of 'ls *' or 'grep xxx *' commands in that directory. I am unsure whether this is intended by the systemd developers but it is unfriendly when investigating this bug.

  Attempted solution:

      1. Edit /lib/systemd/system/nfs-server.service (original lines are
  commented out:

  [Unit]
  Description=NFS server and services
  DefaultDependencies=no
  Requires=network.target proc-fs-nfsd.mount rpcbind.target
  # Requires=nfs-mountd.service
  Wants=nfs-idmapd.service

  After=local-fs.target
  #After=network.target proc-fs-nfsd.mount rpcbind.target nfs-mountd.service
  After=network.target proc-fs-nfsd.mount rpcbind.target
  After=nfs-idmapd.service rpc-statd.service
  #Before=rpc-statd-notify.service
  Before=nfs-mountd.service rpc-statd-notify.service
  ...

  followed by a systemctl daemon-reload and a reboot.

  This results in nfs-kernel-server starting correctly but nfs-mountd
  not so. However starting nfs-mountd manually after reboot is
  successful:

  root@feynmann:~# systemctl status nfs-kernel-server.service
  ● nfs-server.service - NFS server and services
     Loaded: loaded (/lib/systemd/system/nfs-server.service; enabled; vendor preset: enabled)
     Active: active (exited) since Thu 2016-06-09 15:07:23 BST; 1min 25s ago
    Process: 1391 ExecStart=/usr/sbin/rpc.nfsd $RPCNFSDARGS (code=exited, status=0/SUCCESS)
    Process: 1384 ExecStartPre=/usr/sbin/exportfs -r (code=exited, status=0/SUCCESS)
   Main PID: 1391 (code=exited, status=0/SUCCESS)
      Tasks: 0
     Memory: 0B
        CPU: 0
     CGroup: /system.slice/nfs-server.service

  Jun 09 15:07:23 feynmann systemd[1]: Starting NFS server and services...
  Jun 09 15:07:23 feynmann systemd[1]: Started NFS server and services.

  root@feynmann:~# systemctl status nfs-mountd.service
  ● nfs-mountd.service - NFS Mount Daemon
     Loaded: loaded (/lib/systemd/system/nfs-mountd.service; static; vendor preset: enabled)
     Active: inactive (dead)

  root@feynmann:~# systemctl start nfs-mountd.service

  root@feynmann:~# systemctl status nfs-mountd.service
  ● nfs-mountd.service - NFS Mount Daemon
     Loaded: loaded (/lib/systemd/system/nfs-mountd.service; static; vendor preset: enabled)
     Active: active (running) since Thu 2016-06-09 15:09:02 BST; 3s ago
    Process: 2044 ExecStart=/usr/sbin/rpc.mountd $RPCMOUNTDARGS (code=exited, status=0/SUCCESS)
   Main PID: 2046 (rpc.mountd)
      Tasks: 1
     Memory: 904.0K
        CPU: 12ms
     CGroup: /system.slice/nfs-mountd.service
             └─2046 /usr/sbin/rpc.mountd --manage-gids

  Jun 09 15:09:02 feynmann systemd[1]: Starting NFS Mount Daemon...
  Jun 09 15:09:02 feynmann rpc.mountd[2046]: Version 1.2.8 starting
  Jun 09 15:09:02 feynmann systemd[1]: Started NFS Mount Daemon.

  Enabling nfs-mountd.service (systemctl enable nfs-mountd.service) has
  no effect in this case.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: nfs-kernel-server 1:1.2.8-9ubuntu12 [modified: lib/systemd/system/nfs-server.service]
  ProcVersionSignature: Ubuntu 4.4.0-22.40-generic 4.4.8
  Uname: Linux 4.4.0-22-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.1
  Architecture: amd64
  Date: Thu Jun  9 14:38:58 2016
  InstallationDate: Installed on 2016-06-08 (1 days ago)
  InstallationMedia: Ubuntu-Server 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.3)
  ProcEnviron:
   SHELL=/bin/bash
   TERM=linux
   PATH=(custom, no user)
   LANG=en_GB.UTF-8
   LANGUAGE=en_GB:en
  SourcePackage: nfs-utils
  UpgradeStatus: No upgrade log present (probably fresh install)

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