The first error is odd since it detected that we are passing it a GPU pointer, but then subsequently segfaults. For the second case it seems that the CUDA support wasn’t loaded
https://github.com/JuliaParallel/MPI.jl/blob/85accff77c2be82b90eeea645c82d58c2a7186f5/src/MPI.jl#L73
Can you try what Base.cconvert(MPI.MPIPtr, recv_mesg) yields?
In general I think we have been mostly testing on OpenMPI.