Looks like this was fixed in 3.2.33

commit f42ce0ca9eaf8a71f95dd0909c3ade7ab9cd824d
Author: J. Bruce Fields <bfie...@redhat.com>
Date:   Wed Aug 29 15:21:58 2012 -0700

    nfsd4: fix nfs4 stateid leak
    
    commit cf9182e90b2af04245ac4fae497fe73fc71285b4 upstream.
    
    Processes that open and close multiple files may end up setting this
    oo_last_closed_stid without freeing what was previously pointed to.
    This can result in a major leak, visible for example by watching the
    nfsd4_stateids line of /proc/slabinfo.
    
    Reported-by: Cyril B. <c...@excellency.fr>
    Tested-by: Cyril B. <c...@excellency.fr>
    Signed-off-by: J. Bruce Fields <bfie...@redhat.com>
    Signed-off-by: Ben Hutchings <b...@decadent.org.uk>

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https://bugs.launchpad.net/bugs/1047566

Title:
  Memory leaks when using NFS

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