CGAL users discussion list

[Sebastien Tourneux <>]

Sorry for the late answer, I was indeed unintentionally sharing the parametrized between threads. Thanks a lot !

On a side note, when using the ARAP parametrization, I sometimes get a "Border is not simple!" warning that cannot be silenced I think (std::cerr). https://github.com/CGAL/cgal/blob/33fd57c0f117296c3e0708b6652cd5bf9093ac6d/Surface_mesh_parameterization/include/CGAL/Surface_mesh_parameterization/MVC_post_processor_3.h#L695

This is unnecessary as we have the return code ERROR_NON_CONVEX_BORDER indicating the problem.

 Thanks again for you answer,

On 12/3/21 3:37 PM, Sebastien Loriot ( via cgal-discuss Mailing List) wrote:

    Do you
      have a minimal example showing the problem?
      
      In particular, I wonder if you have share the parameterization
      class between threads.
      
      
      Best regards,
      
      
      Sebastien.
      
      
      On 12/2/21 3:57 PM, Sebastien Tourneux wrote:
      
> Hello,
>         
>         
>         I use ARAP_parameterizer_3 to parametrize a model made of
>         several disconnected parts. I want to parametrize independently
>         each part. When each part is processed sequentially, everything
>         is fine, but when processed in parallel, I got a free/malloc
>         crash (see backtrace below) from an `Eigen::SparseLU::factorize`
>         call from `ARAP_parameterizer_3::parameterize`. I use TBB to
>         handle the parallelization.
>         
>         
>         I am not sure if it is an actual issue or if
>         ARAP_parameterizer_3 (or Eigen factorize) is not supposed to be
>         launched in parallel. Looking very briefly at the code, I found
>         `output_uvmap` that seems to write to an hardcoded file (I
>         believe), could it be the cause ?
>         
>         
>         I am using CGAL_VERSION 5.3 (CGAL_GIT_HASH
>         caacd806dc55c61cc68adaad99f2240f00493b29) on Debian 10.
>         
>         
>         Thanks in advance for you help,
>         
>         
>         Sébastien Tourneux
>         
>         
>         
>         Backtrace :
>         
>         
>         malloc(): mismatching next->prev_size (unsorted)
>         
>         free(): invalid size
>         
>         munmap_chunk(): invalid pointer
>         
>         munmap_chunk(): invalid pointermunmap_chunk(): invalid pointer
>         
>         
>         double free or corruption (out)
>         
>         corrupted size vs. prev_size while consolidating
>         
>         malloc(): invalid next size (unsorted)
>         
>         munmap_chunk(): invalid pointer
>         
>         munmap_chunk(): invalid pointer
>         
>         munmap_chunk(): invalid pointer
>         
>         free(): corrupted unsorted chunks
>         
>         double free or corruption (!prev)
>         
>         
>         Thread 128 "exec" received signal SIGSEGV, Segmentation fault.
>         
>         [Switching to Thread 0x7fff217f7700 (LWP 3382513)]
>         
>         0x00007fffddd46125 in
>         Eigen::SparseLU<Eigen::SparseMatrix<double, 0, int>,
>         Eigen::COLAMDOrdering<int>
>          >::factorize(Eigen::SparseMatrix<double, 0, int>
>         const&) () from /path/to/lib/libCgalModel.so
>         
>         #0  0x00007fffddd46125 in
>         Eigen::SparseLU<Eigen::SparseMatrix<double, 0, int>,
>         Eigen::COLAMDOrdering<int>
>          >::factorize(Eigen::SparseMatrix<double, 0, int>
>         const&) () at /path/to/lib/libCgalModel.so
>         
>         #1  0x00007fffde22cb2c in
> CGAL::Eigen_solver_traits<Eigen::SparseLU<Eigen::SparseMatrix<double,
>         0, int>, Eigen::COLAMDOrdering<int> >
>          >::linear_solver(CGAL::Eigen_sparse_matrix<double>
>         const&, CGAL::Eigen_vector<double, -1> const&,
>         CGAL::Eigen_vector<double, -1>&, double&) ()
>         
>              at /path/to/lib/libCgalModel.so
>         
>         #2  0x00007fffde216a95 in
>         CGAL::Surface_mesh_parameterization::Error_code
> CGAL::Surface_mesh_parameterization::ARAP_parameterizer_3<CGAL::Surface_mesh<CGAL::Point_3<CGAL::Simple_cartesian<double>
>          > >,
> CGAL::Surface_mesh_parameterization::Two_vertices_parameterizer_3<CGAL::Surface_mesh<CGAL::Point_3<CGAL::Simple_cartesian<double>
>          > > >,
> CGAL::Default>::update_solution<CGAL::Surface_mesh<CGAL::Point_3<CGAL::Simple_cartesian<double>
>          > >::Property_map<CGAL::SM_Vertex_index,
>         CGAL::Point_2<CGAL::Simple_cartesian<double> > >,
> CGAL::internal::Dynamic<CGAL::Surface_mesh<CGAL::Point_3<CGAL::Simple_cartesian<double>
>          > >,
> CGAL::Surface_mesh<CGAL::Point_3<CGAL::Simple_cartesian<double>
>         >  >::Property_map<CGAL::SM_Vertex_index, int> >,
> CGAL::internal::Dynamic<CGAL::Surface_mesh<CGAL::Point_3<CGAL::Simple_cartesian<double>
>          > >,
> CGAL::Surface_mesh<CGAL::Point_3<CGAL::Simple_cartesian<double>
>         >  >::Property_map<CGAL::SM_Vertex_index, bool> >
>  >(CGAL::Surface_mesh<CGAL::Point_3<CGAL::Simple_cartesian<double>
>         > > const&,
>         boost::unordered::unordered_set<CGAL::SM_Vertex_index,
>         boost::hash<CGAL::SM_Vertex_index>,
>         std::equal_to<CGAL::SM_Vertex_index>,
>         std::allocator<CGAL::SM_Vertex_index> > const&,
> boost::associative_property_map<CGAL::Unique_hash_map<CGAL::SM_Halfedge_index,
>         double, boost::hash<CGAL::SM_Halfedge_index>,
>         std::allocator<double> >  >,
>         std::vector<CGAL::Point_2<CGAL::Simple_cartesian<double>
>         >,
>         std::allocator<CGAL::Point_2<CGAL::Simple_cartesian<double>
>         > > > const&,
> boost::associative_property_map<CGAL::Unique_hash_map<CGAL::SM_Halfedge_index,
>         std::pair<int, int>,
>         boost::hash<CGAL::SM_Halfedge_index>,
>         std::allocator<std::pair<int, int> > > >,
> boost::associative_property_map<CGAL::Unique_hash_map<CGAL::SM_Face_index,
>         std::pair<double, double>,
>         boost::hash<CGAL::SM_Face_index>,
>         std::allocator<std::pair<double, double> > >
>         >,
> CGAL::Surface_mesh<CGAL::Point_3<CGAL::Simple_cartesian<double>
>         >  >::Property_map<CGAL::SM_Vertex_index,
>         CGAL::Point_2<CGAL::Simple_cartesian<double> > >,
> CGAL::internal::Dynamic<CGAL::Surface_mesh<CGAL::Point_3<CGAL::Simple_cartesian<double>
>          > >,
> CGAL::Surface_mesh<CGAL::Point_3<CGAL::Simple_cartesian<double>
>         >  >::Property_map<CGAL::SM_Vertex_index, int> >,
> CGAL::internal::Dynamic<CGAL::Surface_mesh<CGAL::Point_3<CGAL::Simple_cartesian<double>
>          > >,
> CGAL::Surface_mesh<CGAL::Point_3<CGAL::Simple_cartesian<double>
>         >  >::Property_map<CGAL::SM_Vertex_index, bool>
>         >, CGAL::Eigen_sparse_matrix<double> const&) ()
>         
>              at /path/to/lib/libCgalModel.so
>         
>         #3  0x00007fffde2139b5 in
>         CGAL::Surface_mesh_parameterization::Error_code
> CGAL::Surface_mesh_parameterization::ARAP_parameterizer_3<CGAL::Surface_mesh<CGAL::Point_3<CGAL::Simple_cartesian<double>
>          > >,
> CGAL::Surface_mesh_parameterization::Two_vertices_parameterizer_3<CGAL::Surface_mesh<CGAL::Point_3<CGAL::Simple_cartesian<double>
>          > > >,
> CGAL::Default>::parameterize<CGAL::Surface_mesh<CGAL::Point_3<CGAL::Simple_cartesian<double>
>          > >::Property_map<CGAL::SM_Vertex_index,
>         CGAL::Point_2<CGAL::Simple_cartesian<double> > >,
> CGAL::internal::Dynamic<CGAL::Surface_mesh<CGAL::Point_3<CGAL::Simple_cartesian<double>
>          > >,
> CGAL::Surface_mesh<CGAL::Point_3<CGAL::Simple_cartesian<double>
>         >  >::Property_map<CGAL::SM_Vertex_index, int> >,
> CGAL::internal::Dynamic<CGAL::Surface_mesh<CGAL::Point_3<CGAL::Simple_cartesian<double>
>          > >,
> CGAL::Surface_mesh<CGAL::Point_3<CGAL::Simple_cartesian<double>
>         >  >::Property_map<CGAL::SM_Vertex_index, bool> >
>  >(CGAL::Surface_mesh<CGAL::Point_3<CGAL::Simple_cartesian<double>
>         > >&, CGAL::SM_Halfedge_index,
> CGAL::Surface_mesh<CGAL::Point_3<CGAL::Simple_cartesian<double>
>         >  >::Property_map<CGAL::SM_Vertex_index,
>         CGAL::Point_2<CGAL::Simple_cartesian<double> > >,
> CGAL::internal::Dynamic<CGAL::Surface_mesh<CGAL::Point_3<CGAL::Simple_cartesian<double>
>          > >,
> CGAL::Surface_mesh<CGAL::Point_3<CGAL::Simple_cartesian<double>
>         >  >::Property_map<CGAL::SM_Vertex_index, int> >,
> CGAL::internal::Dynamic<CGAL::Surface_mesh<CGAL::Point_3<CGAL::Simple_cartesian<double>
>          > >,
> CGAL::Surface_mesh<CGAL::Point_3<CGAL::Simple_cartesian<double>
>         >  >::Property_map<CGAL::SM_Vertex_index, bool>
>         >) () at /path/to/lib/libCgalModel.so
>         
>         #4  0x00007fffde210c7d in
>         CGAL::Surface_mesh_parameterization::Error_code
> CGAL::Surface_mesh_parameterization::parameterize<CGAL::Surface_mesh<CGAL::Point_3<CGAL::Simple_cartesian<double>
>          > >,
> CGAL::Surface_mesh_parameterization::ARAP_parameterizer_3<CGAL::Surface_mesh<CGAL::Point_3<CGAL::Simple_cartesian<double>
>          > >,
> CGAL::Surface_mesh_parameterization::Two_vertices_parameterizer_3<CGAL::Surface_mesh<CGAL::Point_3<CGAL::Simple_cartesian<double>
>          > > >, CGAL::Default>, CGAL::SM_Halfedge_index,
> CGAL::Surface_mesh<CGAL::Point_3<CGAL::Simple_cartesian<double>
>         >  >::Property_map<CGAL::SM_Vertex_index,
>         CGAL::Point_2<CGAL::Simple_cartesian<double> > >
>  >(CGAL::Surface_mesh<CGAL::Point_3<CGAL::Simple_cartesian<double>
>         > >&,
> CGAL::Surface_mesh_parameterization::ARAP_parameterizer_3<CGAL::Surface_mesh<CGAL::Point_3<CGAL::Simple_cartesian<double>
>          > >,
> CGAL::Surface_mesh_parameterization::Two_vertices_parameterizer_3<CGAL::Surface_mesh<CGAL::Point_3<CGAL::Simple_cartesian<double>
>          > > >, CGAL::Default>, CGAL::SM_Halfedge_index,
> CGAL::Surface_mesh<CGAL::Point_3<CGAL::Simple_cartesian<double>
>         >  >::Property_map<CGAL::SM_Vertex_index,
>         CGAL::Point_2<CGAL::Simple_cartesian<double> > >)
>         () at /path/to/lib/libCgalModel.so
>         
>         
>         
>         
>       
      
    
-- 
Sebastien Tourneux
Buf Compagnie - R&D