Found Bug: Passing false request_array address
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onewayforever commented
191 if (!flag_sends) {
192 MPI_Testall((k+1)/2, &request_array[(k+1)/2-1], &flag_sends, &status_array[(k+1)/2-1]);
193 if (flag_sends) { TIME_END_SEND; }
194 }
should be
192 MPI_Testall((k+1)/2, &request_array[(k+1)/2], &flag_sends, &status_array[(k+1)/2]);