[petsc-dev] Possible SF bug

[Matthew Knepley]

On Mon, Mar 29, 2021 at 11:05 PM Junchao Zhang <junchao.zhang at gmail.com>
wrote:

> Matt,
>   I can reproduce the error. Let me see what is wrong.
>

Thanks! It might be a bug in Plex or Forest as well, but it is hard for me
to tell.

   Matt


>   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/>
>>
>

-- 
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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