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fix: use MPI_STATUS_SIZE=6 for Open MPI (avoids 4-byte stack overflow) #137

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fix: use MPI_STATUS_SIZE=6 for Open MPI (avoids 4-byte stack overflow) #137

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9 changes: 9 additions & 0 deletions src/mpi.f90
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Expand Up @@ -26,7 +26,16 @@ module mpi
integer, parameter :: MPI_MAX = -2301
integer, parameter :: MPI_LOR = -2302
integer, parameter :: MPI_INFO_NULL = -2000
! MPI_STATUS_SIZE must match sizeof(MPI_Status)/sizeof(int) of the underlying
! C library. Open MPI 5.x uses a 6-int (24-byte) MPI_Status, whereas MPICH
! and older Open MPI releases used a 5-int (20-byte) layout. If the two
! disagree the native MPI_Recv/etc. will write past the Fortran status
! buffer and corrupt the surrounding stack.
#ifdef OPEN_MPI
integer, parameter :: MPI_STATUS_SIZE = 6
#else
integer, parameter :: MPI_STATUS_SIZE = 5
#endif
integer :: MPI_STATUS_IGNORE = 0
! NOTE: I've no idea for how to implement this, refer
! see section 2.5.4 page 21 of mpi40-report.pdf
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