Thread 71 "blender" received signal SIGSEGV, Segmentation fault. [Switching to Thread 0x7fffafbff640 (LWP 212531)] 0x0000000003c9e44c in blender::bke::join_mesh_topology_and_builtin_attributes ( set_groups=..., convert_points_to_vertices=true) at /media/data/blender_beau/blender_master/source/blender/blenkernel/intern/geometry_set_instances.cc:451 451 new_loop = old_loop; (gdb) bt #0 0x0000000003c9e44c in blender::bke::join_mesh_topology_and_builtin_attributes(blender::Span, bool) (set_groups=..., convert_points_to_vertices=true) at /media/data/blender_beau/blender_master/source/blender/blenkernel/intern/geometry_set_instances.cc:451 #1 0x0000000003c9f7ee in blender::bke::join_instance_groups_mesh(blender::Span, bool, GeometrySet&) (set_groups=..., convert_points_to_vertices=true, result=...) at /media/data/blender_beau/blender_master/source/blender/blenkernel/intern/geometry_set_instances.cc:626 #2 0x0000000003ca04fe in blender::bke::geometry_set_realize_mesh_for_modifier(GeometrySet const&) (geometry_set=...) at /media/data/blender_beau/blender_master/source/blender/blenkernel/intern/geometry_set_instances.cc:718 #3 0x00000000041f623d in modifyMesh(ModifierData, ModifierEvalContext const, Mesh*) (md=0x7fff21e9bae8, ctx=0x7fffafbb6b00, mesh=0x7ffee2663808) at /media/data/blender_beau/blender_master/source/blender/modifiers/intern/MOD_nodes.cc:1087 #4 0x0000000003752a74 in BKE_modifier_modify_mesh (md=0x7fff21e9bae8, ctx=0x7fffafbb6b00, me=0x7ffee2663808) at /media/data/blender_beau/blender_master/source/blender/blenkernel/intern/modifier.c:1053 #5 0x0000000003b8c336 in mesh_calc_modifiers(Depsgraph, Scene, Object, bool, bool, CustomData_MeshMasks const, int, bool, bool, Mesh, Mesh, GeometrySet**) (depsgraph=0x7fff800e4508, scene=0x7fff800f2c08, ob=0x7ffed0f7ae08, use_deform=true, need_mapping=false, dataMask=0x7fffafbb7120, index=-1, use_cache=true, allow_shared_mesh=true, r_deform=0x7fffafbb7098, r_final=0x7fffafbb7090, r_geometry_set=0x7fffafbb70a0) at /media/data/blender_beau/blender_master/source/blender/blenkernel/intern/DerivedMesh.cc:1336 #6 0x0000000003b8e630 in mesh_build_data(Depsgraph, Scene, Object, CustomData_MeshMasks const, bool) (depsgraph=0x7fff800e4508, scene=0x7fff800f2c08, ob=0x7ffed0f7ae08, dataMask=0x7fffafbb7120, need_mapping=false) at /media/data/blender_beau/blender_master/source/blender/blenkernel/intern/DerivedMesh.cc:1929