Maybe there is a bug in the Register() code. Matt On Tue, Mar 2, 2021 at 4:43 PM Mark Adams <[email protected]> wrote:

I see the problem, but not the solution. I put a print statement in MatSolverTypeDestroy and see:

MatSolverTypeDestroy seqaij inext->next=0x7fb4a9114c70 inext=0x7fb4a9113c70

before it fails. This seqaij node seems to be pointing to itself. If I remove my registration call and it works and I see this from my print statement:

MatSolverTypeDestroy seqaij inext->next=0x7fe811827270 inext=0x7fe811826270 MatSolverTypeDestroy seqaijperm inext->next=0x7fe811909c70 inext=0x7fe811827270 MatSolverTypeDestroy constantdiagonal inext->next=0x7fe81190ac70 inext=0x7fe811909c70 ....

On Tue, Mar 2, 2021 at 3:42 PM Mark Adams <[email protected]> wrote:

...

I am trying to add a band solver to PETSc (later to be moved to Cuda and Kokkos) and I have started by adding some types and a copy of the current LU as placeholders. I register with:

ierr = MatSolverTypeRegister(MATSOLVERPETSC, MATSEQAIJ, MAT_FACTOR_LUBAND,MatGetFactor_seqaij_petsc);CHKERRQ(ierr);

And that is about all that I do that can have any effect at this point. I add a switch in MatGetFactor_seqaij_petsc on (ftype == MAT_FACTOR_LUBAND) to set the symbolic factorization method (*B)->ops->lufactorsymbolic = MatLUBandFactorSymbolic_SeqAIJ; But this is not called (I verified this) because I don't know how to get MatGetFactor_seqaij_petsc to receive ftype == MAT_FACTOR_LUBAND. (I need help on this to)

Anyway, I would hope that these changes would not do anything but I get an error (appended).

It is failing in MatSolverTypeDestroy on this second PetscFree:

while (inext) { ierr = PetscFree(inext->mtype);CHKERRQ(ierr); iprev = inext; inext = inext->next; ierr = PetscFree(iprev);CHKERRQ(ierr); }

I tried to clone LU here, but I clearly missed something.

Any ideas?

And I just made an MR for this if you want to look at the code.

Thanks, Mark ... Number of SNES iterations = 2 [0]PETSC ERROR: PetscTrFreeDefault() called from MatSolverTypeDestroy() line 4513 in /Users/markadams/Codes/petsc/src/mat/interface/matrix.c [0]PETSC ERROR: Block [id=0(48)] at address 0x7fb7fb8f7620 is corrupted (probably write past end of array) [0]PETSC ERROR: Block allocated in MatSolverTypeRegister() line 4382 in /Users/markadams/Codes/petsc/src/mat/interface/matrix.c [0]PETSC ERROR: --------------------- Error Message -------------------------------------------------------------- [0]PETSC ERROR: Memory corruption: https://www.mcs.anl.gov/petsc/documentation/installation.html#valgrind [0]PETSC ERROR: Corrupted memory [0]PETSC ERROR: See https://www.mcs.anl.gov/petsc/documentation/faq.html for trouble shooting. [0]PETSC ERROR: Petsc Development GIT revision: v3.14.4-739-g575f931ef8 GIT Date: 2021-03-02 13:38:55 -0500 [0]PETSC ERROR: ./ex19 on a arch-macosx-gnu-g named MarksMac-302.local by markadams Tue Mar 2 15:28:41 2021 [0]PETSC ERROR: Configure options --with-mpi-dir=/usr/local/Cellar/mpich/3.3.2_1 COPTFLAGS="-g -O0" CXXOPTFLAGS="-g -O0" --download-metis=1 --download-parmetis=1 --download-kokkos=1 --download-kokkos-kernels=1 --download-p4est=1 --with-zlib=1 --download-superlu_dist --download-superlu --with-make-np=4 --download-hdf5=1 -with-cuda=0 --with-x=0 --with-debugging=1 PETSC_ARCH=arch-macosx-gnu-g --with-64-bit-indices=0 --with-openmp=0 --with-ctable=0 [0]PETSC ERROR: #1 PetscTrFreeDefault() line 310 in /Users/markadams/Codes/petsc/src/sys/memory/mtr.c [0]PETSC ERROR: #2 MatSolverTypeDestroy() line 4513 in /Users/markadams/Codes/petsc/src/mat/interface/matrix.c [0]PETSC ERROR: #3 MatFinalizePackage() line 57 in /Users/markadams/Codes/petsc/src/mat/interface/dlregismat.c [0]PETSC ERROR: #4 PetscRegisterFinalizeAll() line 389 in /Users/markadams/Codes/petsc/src/sys/objects/destroy.c [0]PETSC ERROR: #5 PetscFinalize() line 1474 in /Users/markadams/Codes/petsc/src/sys/objects/pinit.c

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