It seems that when I send a process too many non-blocking messages (with MPI_Isend) , MPI_Iprobe/MPI_Recv sometimes returns a buffer

with corrupted data for some of the messages.   Usually the corrupted data objects are at the end of the array that was sent.  I checked the

buffers passed to MPI_Isend, and they are uncorrupted.

1. Is there a way to detect this kind of overload with an MPI call?
2. Is there an upper bound on the number of messages that can be “in flight”?
3. Is there a upper bound on message length?

Thanks,

Kurt