MPI error with mpich

[LudwigBoess]

I encounter a crash when compiling with mpich/3.2.1 and gcc/10.2.0:

Fatal error in PMPI_Allgather: Invalid buffer pointer, error stack:
PMPI_Allgather(1000): MPI_Allgather(sbuf=0x490bc70, scount=1, MPI_FLOAT, rbuf=0x490bc70, rcount=1, MPI_FLOAT, MPI_COMM_WORLD) failed
PMPI_Allgather(945).: Buffers must not be aliased
[unset]: write_line error; fd=-1 buf=:cmd=abort exitcode=201926145

[haykh]

closing this as merged. feel free to reopen if problem persists.