[petsc-dev] Possible SF bug

[Junchao Zhang]

Matt,
  I can reproduce the error. Let me see what is wrong.
  Thanks.
--Junchao Zhang


On Mon, Mar 29, 2021 at 2:16 PM Matthew Knepley <knepley at gmail.com> wrote:

> Junchao,
>
> I have an SF problem, which I think is a caching bug, but it is hard to
> see what is happening in the internals. I have made a small example which
> should help you see what is wrong. It is attached.
>
> If you run without arguments, you get
>
> master *:~/Downloads/tmp/Salac$ ./forestHDF
> [0]PETSC ERROR: --------------------- Error Message
> --------------------------------------------------------------
> [0]PETSC ERROR: Null argument, when expecting valid pointer
> [0]PETSC ERROR: Trying to copy to a null pointer
> [0]PETSC ERROR: See https://www.mcs.anl.gov/petsc/documentation/faq.html
> for trouble shooting.
> [0]PETSC ERROR: Petsc Development GIT revision: v3.14.5-879-g03cacdc99d
>  GIT Date: 2021-03-22 01:02:08 +0000
> [0]PETSC ERROR: ./forestHDF on a arch-master-debug named
> MacBook-Pro.fios-router.home by knepley Mon Mar 29 15:14:16 2021
> [0]PETSC ERROR: Configure options --PETSC_ARCH=arch-master-debug
> --download-bamg --download-chaco --download-ctetgen --download-egads
> --download-eigen --download-exodusii --download-fftw --download-hpddm
> --download-libpng --download-metis --download-ml --download-mumps
> --download-netcdf --download-opencascade --download-p4est
> --download-parmetis --download-pnetcdf --download-scalapack
> --download-slepc --download-suitesparse --download-superlu_dist
> --download-triangle --with-cmake-exec=/PETSc3/petsc/apple/bin/cmake
> --with-ctest-exec=/PETSc3/petsc/apple/bin/ctest
> --with-hdf5-dir=/PETSc3/petsc/apple --with-mpi-dir=/PETSc3/petsc/apple
> --with-shared-libraries --with-slepc --with-zlib --download-tetgen
> [0]PETSC ERROR: #1 PetscMemcpy() at
> /PETSc3/petsc/petsc-dev/include/petscsys.h:1798
> [0]PETSC ERROR: #2 UnpackAndInsert_PetscReal_1_1() at
> /PETSc3/petsc/petsc-dev/src/vec/is/sf/impls/basic/sfpack.c:426
> [0]PETSC ERROR: #3 ScatterAndInsert_PetscReal_1_1() at
> /PETSc3/petsc/petsc-dev/src/vec/is/sf/impls/basic/sfpack.c:426
> [0]PETSC ERROR: #4 PetscSFLinkScatterLocal() at
> /PETSc3/petsc/petsc-dev/src/vec/is/sf/impls/basic/sfpack.c:1248
> [0]PETSC ERROR: #5 PetscSFBcastBegin_Basic() at
> /PETSc3/petsc/petsc-dev/src/vec/is/sf/impls/basic/sfbasic.c:193
> [0]PETSC ERROR: #6 PetscSFBcastWithMemTypeBegin() at
> /PETSc3/petsc/petsc-dev/src/vec/is/sf/interface/sf.c:1493
> [0]PETSC ERROR: #7 DMGlobalToLocalBegin() at
> /PETSc3/petsc/petsc-dev/src/dm/interface/dm.c:2565
> [0]PETSC ERROR: #8 VecView_Plex_HDF5_Internal() at
> /PETSc3/petsc/petsc-dev/src/dm/impls/plex/plexhdf5.c:251
> [0]PETSC ERROR: #9 VecView_Plex() at
> /PETSc3/petsc/petsc-dev/src/dm/impls/plex/plex.c:385
> [0]PETSC ERROR: #10 VecView_p4est() at
> /PETSc3/petsc/petsc-dev/src/dm/impls/forest/p4est/pforest.c:4922
> [0]PETSC ERROR: #11 VecView() at
> /PETSc3/petsc/petsc-dev/src/vec/vec/interface/vector.c:613
> [0]PETSC ERROR: #12 main() at
> /Users/knepley/Downloads/tmp/Salac/forestHDF.c:53
> [0]PETSC ERROR: PETSc Option Table entries:
> [0]PETSC ERROR: -malloc_debug
> [0]PETSC ERROR: ----------------End of Error Message -------send entire
> error message to petsc-maint at mcs.anl.gov----------
> application called MPI_Abort(MPI_COMM_SELF, 53001) - process 0
> [unset]: write_line error; fd=-1 buf=:cmd=abort exitcode=53001
>
> If you run with
>
>   ./forestHDF -write_early
>
> or
>
>   ./forestHDF -no_g2l
>
> Then it is fine. Thus it appears to me that if you run a G2L at the wrong
> time, something is incorrectly cached.
>
>   Thanks,
>
>     Matt
>
> --
> What most experimenters take for granted before they begin their
> experiments is infinitely more interesting than any results to which their
> experiments lead.
> -- Norbert Wiener
>
> https://www.cse.buffalo.edu/~knepley/
> <http://www.cse.buffalo.edu/~knepley/>
>
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