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https://bugs.launchpad.net/ubuntu/+source/linux-meta/+bug/1785788/+attachment/5172471/+files/version.log

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https://bugs.launchpad.net/bugs/1785788

Title:
  NFS breaks after wake from suspend

Status in linux-meta package in Ubuntu:
  New

Bug description:
  Hello,

  I am observing all symptoms of debian bug 898060 
(https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=898060) on ubuntu bionic 
4.15.0-23-generic x86_64 clients
  with a Centos7 NFS server (3.10.0-693.21.1.el7.x86_64).

  After a wake from suspend the server always logs
  kernel: NFSD: client 2001:638:redacted testing state ID with incorrect client 
ID
  which is not observed with ubuntu 16.04 (kernel 4.4) clients. Sporadically 
after wake from suspend (takes days to weeks to trigger) the server logs are 
flooded with messages of the type
  kernel: RPC request reserved 84 but used 276
  and NFS on the client does not work any more. This also has not been observed 
with our 20 or so ubuntu 16.04 NFS clients in the last two years.

  Rebooting the client appears to stop the log flooding on the server
  and NFS works normally after the reboot. Remark: systemd hangs during
  shutdown, presumably waiting for the NFS mount to stop, the power
  button is the only remaining option.

  I will upgrade to the latest bionic kernel later and try to trigger
  this again.

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