Hi! I'm getting a segfault in hwloc_setup_distances_from_os_matrix in the call to hwloc_bitmap_or due to objs or objs[i]->cpuset being freed and containing garbage, objs[i]->cpuset has infinite < 0.
I only get this when using slurm with cgroups, asking for 2 nodes with 1 cpu each. The cpuset is then already set when mpiexec starts and something breaks down. valgrind on mpiexec says: ==27540== Invalid read of size 8 ==27540== at 0x7178F79: opal_paffinity_hwloc_finalize_logical_distances (distances.c:412) ==27540== by 0x7172C1E: hwloc_discover (topology.c:1805) ==27540== by 0x71745F2: opal_paffinity_hwloc_topology_load (topology.c:2244) ==27540== by 0x7164FB4: hwloc_open (paffinity_hwloc_component.c:93) ==27540== by 0x4F98D2E: mca_base_components_open (mca_base_components_open.c:214) ==27540== by 0x500084B: opal_paffinity_base_open (paffinity_base_open.c:120) ==27540== by 0x4F525BB: opal_init (opal_init.c:307) ==27540== by 0x4E50CA8: orte_init (orte_init.c:78) ==27540== by 0x403C8F: orterun (orterun.c:615) ==27540== by 0x4032C3: main (main.c:13) ==27540== Address 0x6e38380 is 160 bytes inside a block of size 248 free'd ==27540== at 0x4C270BD: free (vg_replace_malloc.c:366) ==27540== by 0x716B6A1: unlink_and_free_object_and_children (topology.c:1131) ==27540== by 0x716BB35: remove_empty (topology.c:1150) ==27540== by 0x7170CBB: hwloc_discover (topology.c:1768) ==27540== by 0x71745F2: opal_paffinity_hwloc_topology_load (topology.c:2244) ==27540== by 0x7164FB4: hwloc_open (paffinity_hwloc_component.c:93) ==27540== by 0x4F98D2E: mca_base_components_open (mca_base_components_open.c:214) ==27540== by 0x500084B: opal_paffinity_base_open (paffinity_base_open.c:120) ==27540== by 0x4F525BB: opal_init (opal_init.c:307) ==27540== by 0x4E50CA8: orte_init (orte_init.c:78) ==27540== by 0x403C8F: orterun (orterun.c:615) ==27540== by 0x4032C3: main (main.c:13) I hope the above info is enough and that you can fix it :-) /Åke S.
