Comment # 3 on bug 1120087 from Neil Brown

Thanks.
After the suspend/resume we see:

/proc/fs/nfsd/threads:0

where is was '4' before hand. So the nfs server had been stopped - no threads
running any more.

Also 4 services have disappears from sys systemctl listing:
 nfsserver.service
 nfs-mountd.service
 nfs-server.service
 nfs-idmapd.service

Presumably that have been stopped - inactive services aren't matched by
wildcards.

It might be useful to see
  systemctl status nfsserver nfs-mountd nfs-server nfs-idmapd
after the suspend/resume.

It seems like something ran
   systemctl stop nfs-server

or similar.  I cannot think of anything that would do that.

running
  systemctl restart nfs-server

after the suspend/resume would getting you working again, but you don't really
want to do that.

Maybe getting systemd debug logs would help.  You would need to reboot and add
  debug printk.devkmsg=on
to the command line (interrupt grub with 'e' to edit)
Then suspend/resume, then
  dmesg > file
and attach the file.