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/usr/share/openmpi/help-rcache-base.txt is in openmpi-common 2.1.1-8.

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# -*- text -*-
#
# Copyright (c) 2007-2009 Cisco Systems, Inc.  All rights reserved.
# Copyright (c) 2015      Los Alamos National Security, LLC. All rights
#                         reserved.
# $COPYRIGHT$
#
# Additional copyrights may follow
#
# $HEADER$
#
[leave pinned failed]
A process attempted to use the "leave pinned" MPI feature, but no
memory registration hooks were found on the system at run time.  This
may be the result of running on a system that does not support memory
hooks or having some other software subvert Open MPI's use of the
memory hooks.  You can disable Open MPI's use of memory hooks by
setting both the mpi_leave_pinned and mpi_leave_pinned_pipeline MCA
parameters to 0.

Open MPI will disable any transports that are attempting to use the
leave pinned functionality; your job may still run, but may fall back
to a slower network transport (such as TCP).

  rcache name: %s
  Process:     %s
  Local host:  %s
#
[cannot deregister in-use memory]
Open MPI intercepted a call to free memory that is still being used by
an ongoing MPI communication.  This usually reflects an error in the
MPI application; it may signify memory corruption.  Open MPI will now
abort your job.

  rcache name:    %s
  Local host:     %s
  Buffer address: %p
  Buffer size:    %lu