rpc.mountd sends strings that are too long over RPC channels

Solution Unverified - Updated -

Issue

  • exports with a user in a large number of individual netgroups(more than 60) fails to mount on some clients
  • Some clients may receive EPERM error.
  • Failure also produces the following error message in the server:
Apr 12 12:04:22 srv rpc.mountd[12143]: qword_printhex: fwrite failed: errno 22 (Invalid argument)
Apr 12 12:04:22 srv rpc.mountd[12143]: qword_eol: fflush failed: errno 22 (Invalid argument)
Apr 12 12:04:22 srv rpc.mountd[12143]: Cannot export /export/..., possibly unsupported filesystem or fsid= required

Environment

  • Red Hat Enterprise Linux 6.2

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