title: MPI_ERR_BUFFER: invalid buffer pointer
body: <p>What is the most common reason for this error </p>
  
  <pre><code> MPI_ERR_BUFFER: invalid buffer pointer
  </code></pre>
  
  <p>which results from MPI_Bsend() and MPI_Rcev() calls?
  The program works fine when the number of parallel processes is small (&lt;14), but when I increase the number of processes I get this error. </p>