I am seeing this:

"Abort(105) on node 0 (rank 0 in comm 0): Fatal error in PMPI_Isend: Unknown error class"

This is after my float vector I am sending to the nodes has increased to a size of ~70 elements.  I cannot find any documentation about what this means.  I tracked down where this fails and upon sending it to the 300th process (of 600), the MPI_ISend() command dies and this error shows.

Is there anything I can do to further diagnose the issue?  

Best,

Brent