[Bug 1378691] Re: nfs4 id mapping unstable

[Andrew]

Is anyone else getting this?  Do you need more information or anything
testing?

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Title:
  nfs4 id mapping unstable

Status in “nfs-utils” package in Ubuntu:
  New

Bug description:
  Ubuntu 14.04 LTS
  Mounting an NFS4 share from a EMC nas and using ldap to get ids through nsswitch.

  This works but occasionally an id is lost suddenly and ls -l shows the
  file owner and group as nfsnobody.

  I tried using sysctl to increase kernel.keys (it didn't help)
  kernel.keys.root_maxkeys = 10000
  kernel.keys.root_maxbytes = 200000
  kernel.keys.maxkeys = 10000
  kernel.keys.maxbytes = 200000

  I tried changing the timeout in /etc/request-key.d/id_resolver.conf to 10 seconds (it didn't help)
  create  id_resolver     *       *       /usr/sbin/nfsidmap -t 10 %k %d

  To fix the problem I have manually upgraded the kernel to
  3.13.0-36-generic and I continually clear the id keys using "watch
  nfsidmap -c".  This seems to have reduced the problem so that I
  haven't seen it so far after 2 hours.

  It seems that occasionally a bad id lookup happens, and then gets
  cached as bad for a very long time, and that my clearing the cache
  manually gets it to do another lookup. (Does the key return bad when
  it times-out instead of re-looking up?)

  root# cat /proc/keys
  ...
  29dccc9d I--Q---     1   9m 3b010000     0     0 id_legacy uid:aj-hart at uwe.ac.uk: 5

  and that the "-t 10" setting is ignored and is set to 600~9m instead.

  I am hoping for a better fix than my "watch nfsidmap -c" hack if
  possible.

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