This was fixed in the latest 4.15 kernels (linux-hwe 4.15.0-60.67)

** Changed in: linux (Ubuntu Bionic)
       Status: Confirmed => Fix Released

** Changed in: linux-hwe (Ubuntu)
       Status: New => Fix Released

** Changed in: linux-hwe (Ubuntu Bionic)
       Status: New => Invalid

** Changed in: linux-hwe (Ubuntu Xenial)
       Status: New => Fix Released

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https://bugs.launchpad.net/bugs/1802585

Title:
  NFS v4.0: Stale data after file is renamed while another process has
  an open file handle

Status in linux package in Ubuntu:
  Fix Released
Status in linux-hwe package in Ubuntu:
  Fix Released
Status in linux source package in Xenial:
  Confirmed
Status in linux-hwe source package in Xenial:
  Fix Released
Status in linux source package in Bionic:
  Fix Released
Status in linux-hwe source package in Bionic:
  Invalid
Status in linux source package in Cosmic:
  Won't Fix
Status in linux-hwe source package in Cosmic:
  Won't Fix
Status in linux source package in Disco:
  Fix Released
Status in linux-hwe source package in Disco:
  Won't Fix

Bug description:
  NOTE: This bug has been fixed in the upstream mainline kernel via
  
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?h=be189f7e7f03de35887e5a85ddcf39b91b5d7fc1
  and merged in the latest NFS client patches in
  
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?h=c7a2c49ea6c9eebbe44ff2c08b663b2905ee2c13.

  The full patchset is here: https://marc.info/?l=linux-
  nfs&m=153816500525563&w=2

  I'm repeating the report I sent to the NFS maintainers on the mailing
  list:

  On Ubuntu 16.04 (4.4.0-130) with NFS v4.0, I'm seeing an issue where
  stale data is shown if a file remains open on one machine, and the
  file is overwritten via a rename() on another. Here's my test:

  1. On node A, create two different files on a shared NFS mount:
  "test1.txt" and "test2.txt".
  2. On node B, continuously show the contents of the first file: "while
  true; do cat test1.txt; done"
  3. On node B, run a process that keeps "test1.txt" open. For example,
  with Python, run:
       f = open('/nfs-mount/test1.txt', 'r')
  4. Rename test2.txt via "mv -f test2.txt test1.txt"

  On node B, I see the contents of the original test1.txt indefinitely,
  even after I disabled attribute caching and the lookup cache. I can
  make the while loop in step 2 show the new content if I perform one of
  these actions:

  1. Run "ls /nfs-mount"
  2. Close the open file in step 3

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