You folks don't have a valgrind build handy by any chance...? -- Boyce
On 3/14/11 1:08 PM, John Peterson wrote: > On Mon, Mar 14, 2011 at 11:03 AM, Roy Stogner<[email protected]> > wrote: >> >> On Mon, 14 Mar 2011, Boyce Griffith wrote: >> >>> OK, it looks like this was introduced in r4248. >> >> Wait: r4248, the revision that moved >> libmesh_assert_valid_parallel_ids() to MeshBase?? The default >> implementation of that is "{}"; how on earth should that be giving us >> a segfault? >> >> Wait, weirder than that: The only places ever calling that changed >> code are in MeshRefinement and InfElemBuilder... and your test example >> doesn't even indirectly use either! >> >> I have no idea what could be going on here. > > Me neither, other than we might have had a bug lurking for years and > some slight change somewhere triggered it. Undefined behavior and all > that... > > I can confirm that Boyce's example runs for me in 4247, and segfaults in 4248. > > My backtrace is a bit different than his, it doesn't get down into the > iterators at all: > > (gdb) bt > #0 0x00007fff85bfcfca in __semwait_signal () > #1 0x00007fff85bfce59 in nanosleep () > #2 0x00007fff85c49df0 in sleep () > #3 0x00000001002e8898 in PetscSleep () at mesh.h:72 > #4 0x00000001002c4e64 in PetscAttachDebugger () at mesh.h:72 > #5 0x00000001002c4ee5 in PetscAttachDebuggerErrorHandler () at mesh.h:72 > #6 0x00000001002c580e in PetscError () at mesh.h:72 > #7 0x00000001002c8f10 in PetscDefaultSignalHandler () at mesh.h:72 > #8 0x00000001002c8fc5 in PetscSignalHandler_Private () at mesh.h:72 > #9<signal handler called> > #10 0x0000000100ab2d8c in libMesh::UnstructuredMesh::find_neighbors > (this=0x7fff5fbfed10, reset_remote_elements=false, > reset_current_list=true) at src/mesh/unstructured_mesh.C:201 > #11 0x00000001009906d3 in libMesh::MeshBase::prepare_for_use > (this=0x7fff5fbfed10, skip_renumber_nodes_and_elements=false) at > src/mesh/mesh_base.C:98 > #12 0x00000001009e3186 in libMesh::MeshTools::Generation::build_cube > (mesh=@0x7fff5fbfed10, nx=2, ny=2, nz=0, xmin=0, xmax=1, ymin=0, > ymax=1, zmin=0, zmax=0, type=libMeshEnums::QUAD4, > gauss_lobatto_grid=false) at src/mesh/mesh_generation.C:1438 > #13 0x00000001009e3219 in libMesh::MeshTools::Generation::build_square > (mesh=@0x7fff5fbfed10, nx=2, ny=2, xmin=0, xmax=1, ymin=0, ymax=1, > type=libMeshEnums::QUAD4, gauss_lobatto_grid=false) at > src/mesh/mesh_generation.C:1501 > #14 0x0000000100002f12 in main (argc=2, argv=0x7fff5fbfedb0) at > boyce_bug.cc:26 ------------------------------------------------------------------------------ Colocation vs. Managed Hosting A question and answer guide to determining the best fit for your organization - today and in the future. http://p.sf.net/sfu/internap-sfd2d _______________________________________________ Libmesh-devel mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/libmesh-devel
