input/output errors from "make check"

[Carl Ponder]

I'm building HPC tools on a shared cluster, and trying to "bulletproof" 
them as much as possible by enabling all the capabilities and running 
all the built-in validation tests.
In this case I'm building PNetCDF 1.6.0 using OpenMPI 1.8.5 and GCC/5.1.0.
Here are some oddities from the "make check" that I ran:

    ./nf_test       -d .
    rank 0: MPI error (MPI_File_delete) : MPI_ERR_IO: input/output error
    rank 0: MPI error (MPI_File_delete) : MPI_ERR_IO: input/output error
    *** TESTING F77 ./nf_test for CDF-1                               
    ------ pass
    ./nf_test -c -2 -d .
    ./nf_test -2    -d .
    rank 0: MPI error (MPI_File_delete) : MPI_ERR_IO: input/output error
    rank 0: MPI error (MPI_File_delete) : MPI_ERR_IO: input/output error
    *** TESTING F77 ./nf_test for CDF-2                               
    ------ pass
    ./nf_test -c -5 -d .
    ./nf_test -5    -d .
    rank 0: MPI error (MPI_File_delete) : MPI_ERR_IO: input/output error
    rank 0: MPI error (MPI_File_delete) : MPI_ERR_IO: input/output error
    *** TESTING F77 ./nf_test for CDF-5                               
    ------ pass
    ./nf90_test       -d .
    rank 0: MPI error (MPI_File_delete) : MPI_ERR_IO: input/output error
    rank 0: MPI error (MPI_File_delete) : MPI_ERR_IO: input/output error
    *** TESTING F90 ./nf90_test for CDF-1                             
    ------ pass
    ./nf90_test -c -2 -d .
    ./nf90_test -2    -d .
    rank 0: MPI error (MPI_File_delete) : MPI_ERR_IO: input/output error
    rank 0: MPI error (MPI_File_delete) : MPI_ERR_IO: input/output error
    *** TESTING F90 ./nf90_test for CDF-2                             
    ------ pass
    ./nf90_test -c -5 -d .
    ./nf90_test -5    -d .
    rank 0: MPI error (MPI_File_delete) : MPI_ERR_IO: input/output error
    rank 0: MPI error (MPI_File_delete) : MPI_ERR_IO: input/output error
    *** TESTING F90 ./nf90_test for CDF-5                             
    ------ pass

So the tests are listed as passing, but the messages indicate that an 
error had occurred.
Are there any global MPI settings that I need to make in order for these 
tests to work?
Or did these tests really run OK?
Also when I used the PGI 15.5 compiler instead of the GCC compiler, I 
got similar messages on the F77 tests.
But when it started the first F90 test, it hanged.

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