Hi all, we found another integer overflow when using MPI_Sendrecv_replace, see attached file. When the buffer size exceeds MAX_INT, a segmentation fault occurs. I could reproduce this with the MPICH 3.3a2 installation on my Ubuntu desktop. @Jeff: I could reproduce the segfault as well as with IntelMPI 2018 IntelMPI 2019 detects a message truncation Best Joachim -- Dipl.-Inf. Joachim Protze IT Center Group: High Performance Computing Division: Computational Science and Engineering RWTH Aachen University Seffenter Weg 23 D 52074 Aachen (Germany) Tel: +49 241 80- 24765 Fax: +49 241 80-624765 [email protected] www.itc.rwth-aachen.de