[Bug 1956787] Re: nfs v3 locking fails - rpc-statd not started after minor upgrade

[Charles Hedrick]

That's a sensible approach, but there are loads of web pages telling
people how to set up NFS, and they all claim that on current
distributions you no longer need to enable individual services. That's
not true for Ubuntu 20.

Please do make sure it's fix in 22.04.

The original reasoning had a hole in it: with the scripts, there were
three states: on, off, and default. Default was on. With the patch the
default is off. I see no way in systemd to duplicate the way the scripts
worked purely within systemd.

This problem is particularly insidious. First, the symptoms aren't
obvious. It took us a couple of days to figure out what was going on.
Second, the problem doesn't occur if you mount anything by NFS3. So
things worked in testing, but failed the first time we rebooting in
production.

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https://bugs.launchpad.net/bugs/1956787

Title:
  nfs v3 locking fails - rpc-statd not started after minor upgrade

Status in nfs-utils package in Ubuntu:
  Confirmed

Bug description:
  We just upgraded our nfs servers from 5.4.0-72 to 5.4.0-92.

  We are using NFS v3 in a large computer science department, with
  several hundred clients.

  Lots of applications are now failing because locks don't work.

  /var/log/syslog on the client reports lockd not responding. tcpdump
  shows that the client tries to connect to lockd but there is no
  response to the TCP SYN.

  netstat on the server shows some connections open, with lots of bytes
  in the receive queue.

  The problem probably occurs only with lots of clients. I believe any
  typical test would work fine.

  The problem is new. That is, it didn't happen in 5.4.0-72.

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: kernel-common (not installed)
  ProcVersionSignature: Ubuntu 5.4.0-92.103-generic 5.4.157
  Uname: Linux 5.4.0-92-generic x86_64
  NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
  ApportVersion: 2.20.11-0ubuntu27.21
  Architecture: amd64
  CasperMD5CheckResult: pass
  Date: Fri Jan  7 13:07:34 2022
  InstallationDate: Installed on 2020-10-14 (450 days ago)
  InstallationMedia: Ubuntu-Server 20.04.1 LTS "Focal Fossa" - Release amd64 (20200731)
  SourcePackage: kernel-package
  UpgradeStatus: No upgrade log present (probably fresh install)
  modified.conffile..etc.default.apport: [modified]
  mtime.conffile..etc.default.apport: 2020-10-14T13:53:33.474467

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