[OMPI users] Allreduce with Op

Sat, 13 Mar 2021 01:49:59 -0800 

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

Attachment: 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)

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