Hello, The following piece of code generates Valgrind errors with OpenMPI 4.1.0, while it is Valgrind-clean with MPICH and OpenMPI 4.0.5. I don’t think I’m doing anything illegal, so could this be a regression introduced in 4.1.0?
Thanks, Pierre $ /opt/openmpi-4.1.0/bin/mpicxx ompi.cxx -g -O0 -std=c++11 $ /opt/openmpi-4.1.0/bin/mpirun -n 4 valgrind --log-file=dump.%p.log ./a.out
ompi.cxx
Description: Binary data
==528== Invalid read of size 2 ==528== at 0x4011EB: main::{lambda(void*, void*, int*, ompi_datatype_t**)#1}::operator()(void*, void*, int*, ompi_datatype_t**) const (ompi.cxx:15) ==528== by 0x40127B: main::{lambda(void*, void*, int*, ompi_datatype_t**)#1}::_FUN(void*, void*, int*, ompi_datatype_t**) (ompi.cxx:19) ==528== by 0x48EFFED: ompi_coll_base_allreduce_intra_ring (in /opt/openmpi-4.1.0/lib/libmpi.so.40.30.0) ==528== by 0x77CD93A: ompi_coll_tuned_allreduce_intra_dec_fixed (in /opt/openmpi-4.1.0/lib/openmpi/mca_coll_tuned.so) ==528== by 0x48AAF00: PMPI_Allreduce (in /opt/openmpi-4.1.0/lib/libmpi.so.40.30.0) ==528== by 0x401317: main (ompi.cxx:21) ==528== Address 0x7139f74 is 0 bytes after a block of size 4 alloc'd ==528== at 0x4839809: malloc (vg_replace_malloc.c:307) ==528== by 0x48EF940: ompi_coll_base_allreduce_intra_ring (in /opt/openmpi-4.1.0/lib/libmpi.so.40.30.0) ==528== by 0x77CD93A: ompi_coll_tuned_allreduce_intra_dec_fixed (in /opt/openmpi-4.1.0/lib/openmpi/mca_coll_tuned.so) ==528== by 0x48AAF00: PMPI_Allreduce (in /opt/openmpi-4.1.0/lib/libmpi.so.40.30.0) ==528== by 0x401317: main (ompi.cxx:21) ==528== ==528== Invalid read of size 2 ==528== at 0x40120E: main::{lambda(void*, void*, int*, ompi_datatype_t**)#1}::operator()(void*, void*, int*, ompi_datatype_t**) const (ompi.cxx:16) ==528== by 0x40127B: main::{lambda(void*, void*, int*, ompi_datatype_t**)#1}::_FUN(void*, void*, int*, ompi_datatype_t**) (ompi.cxx:19) ==528== by 0x48EFFED: ompi_coll_base_allreduce_intra_ring (in /opt/openmpi-4.1.0/lib/libmpi.so.40.30.0) ==528== by 0x77CD93A: ompi_coll_tuned_allreduce_intra_dec_fixed (in /opt/openmpi-4.1.0/lib/openmpi/mca_coll_tuned.so) ==528== by 0x48AAF00: PMPI_Allreduce (in /opt/openmpi-4.1.0/lib/libmpi.so.40.30.0) ==528== by 0x401317: main (ompi.cxx:21) ==528== Address 0x7139f76 is 2 bytes after a block of size 4 alloc'd ==528== at 0x4839809: malloc (vg_replace_malloc.c:307) ==528== by 0x48EF940: ompi_coll_base_allreduce_intra_ring (in /opt/openmpi-4.1.0/lib/libmpi.so.40.30.0) ==528== by 0x77CD93A: ompi_coll_tuned_allreduce_intra_dec_fixed (in /opt/openmpi-4.1.0/lib/openmpi/mca_coll_tuned.so) ==528== by 0x48AAF00: PMPI_Allreduce (in /opt/openmpi-4.1.0/lib/libmpi.so.40.30.0) ==528== by 0x401317: main (ompi.cxx:21) ==528== ==528== Invalid read of size 2 ==528== at 0x401231: main::{lambda(void*, void*, int*, ompi_datatype_t**)#1}::operator()(void*, void*, int*, ompi_datatype_t**) const (ompi.cxx:18) ==528== by 0x40127B: main::{lambda(void*, void*, int*, ompi_datatype_t**)#1}::_FUN(void*, void*, int*, ompi_datatype_t**) (ompi.cxx:19) ==528== by 0x48EFFED: ompi_coll_base_allreduce_intra_ring (in /opt/openmpi-4.1.0/lib/libmpi.so.40.30.0) ==528== by 0x77CD93A: ompi_coll_tuned_allreduce_intra_dec_fixed (in /opt/openmpi-4.1.0/lib/openmpi/mca_coll_tuned.so) ==528== by 0x48AAF00: PMPI_Allreduce (in /opt/openmpi-4.1.0/lib/libmpi.so.40.30.0) ==528== by 0x401317: main (ompi.cxx:21) ==528== Address 0x7139f78 is 4 bytes after a block of size 4 alloc'd ==528== at 0x4839809: malloc (vg_replace_malloc.c:307) ==528== by 0x48EF940: ompi_coll_base_allreduce_intra_ring (in /opt/openmpi-4.1.0/lib/libmpi.so.40.30.0) ==528== by 0x77CD93A: ompi_coll_tuned_allreduce_intra_dec_fixed (in /opt/openmpi-4.1.0/lib/openmpi/mca_coll_tuned.so) ==528== by 0x48AAF00: PMPI_Allreduce (in /opt/openmpi-4.1.0/lib/libmpi.so.40.30.0) ==528== by 0x401317: main (ompi.cxx:21)