opal_unpack_general_function might upack too much data #2535
Description
@bosilca can you please take care of that ?
the following program works fine if both task run on homogeneous nodes, but fail otherwise.
i strongly suspect the root cause is opal_unpack_general_function that does not exit when the unpacked data reaches *max_data
#include <assert.h>
#include <mpi.h>
/* simple bug reproducer
* task 0 MPI_Recv 2 MPI_INT but task 1 only MPI_Send 1 MPI_INT
* ok on homogeneous node(s), ko on heterogeneous nodes */
int main(int argc, char *argv[]) {
int b[2];
int rank;
MPI_Status status;
int count;
int err;
MPI_Init(&argc, &argv);
MPI_Comm_rank(MPI_COMM_WORLD, &rank);
if (0 == rank) {
b[0] = -1;
b[1] = -1;
err = MPI_Recv(b, 2, MPI_INT, 1, 0, MPI_COMM_WORLD, &status);
assert(MPI_SUCCESS == err);
err = MPI_Get_elements(&status, MPI_INT, &count);
assert(MPI_SUCCESS == err);
assert(1 == count);
assert(0 == b[0]);
assert(-1 == b[1]); // currently fails on heterogeneous nodes
} else if (1 == rank) {
b[0] = 0;
b[1] = 2;
MPI_Send(b, 1, MPI_INT, 0, 0, MPI_COMM_WORLD);
}
MPI_Finalize();
return 0;
}