[NEST Users] Assert failed running hpc_benchmark

Dear NEST Users & Developers, we're currently working on a custom OpenMPI BTL (supporting a custom FPGA-based NIC) at the National Institute for Nuclear Physics in Rome, Italy and we have an error when running hpc_benchmark(this test is currently used as simple validation test) with 2 processes (one on each of 2 hosts), the command we run is like: mpirun -n 2 -H host1:1,host2:1 --bynode --report-bindings -mca btl apelink,self,sm python hpc_benchmark.py (apelink is our custom BTL component) but then we see this error: python: [...]/NEST_with_local_ompi/nest-simulator-3.6/nestkernel/target_table.cpp:107: void nest::TargetTable::add_target(size_t, size_t, const nest::TargetData&): Assertion `syn_id < secondary_send_buffer_pos_[ tid ][ lid ].size()' failed. [host:23979] *** Process received signal *** [host:23979] Signal: Aborted (6) [host:23979] Signal code: (-6) My guess is that we are transferring something incorrectly (maybe during the initialization/setup phase?), but I'm not sure what the assert expects to have in secondary_send_buffer_pos_[ tid ][ lid ].size() and how this field should be set. Best, Michele