------- Comment From [email protected] 2015-10-30 22:58 EDT-------
Ahhh.  (In reply to comment #42)
> Sorry about the idmapd misdirection based on my cursory read of the stack.
> Since they are mounting with sec=sys, idmappng should be disabled.
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

I think this is the trigger we have been missing.  This change does not
appear to be in place for the kernel version the customer is running on
his NFS server.  But it does appear to be the default behavior for the
servers we have been trying to replicate with.  Because of this,
mounting sec=sys is causing our test servers to send back uid/gid
information instead of name mapping (so our client code doesn't need the
callout).   I will try to install a down-rev system as a server for
validation if someone else doesn't beat me to the punch first.

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https://bugs.launchpad.net/bugs/1509120

Title:
  Process accounting deadlock with idmapd callout when writing to NFSv4
  mount

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