[petsc-users] Valgrind Issue With Ghosted Vectors

[Derek Gaston]

Trying to track down some memory corruption I'm seeing on larger scale runs
(3.5B+ unknowns).  Was able to run Valgrind on it... and I'm seeing quite a
lot of uninitialized value errors coming from ghost updating.  Here are
some of the traces:

==87695== Conditional jump or move depends on uninitialised value(s)
==87695==    at 0x73236D3: PetscMallocAlign (mal.c:28)
==87695==    by 0x7323C70: PetscMallocA (mal.c:390)
==87695==    by 0x739048E: VecScatterMemcpyPlanCreate_Index (vscat.c:284)
==87695==    by 0x73A5D97: VecScatterMemcpyPlanCreate_PtoP
(vpscat_mpi1.c:312)
==64730==    by 0x7393E8A: VecScatterSetUp_vectype_private (vscat.c:857)
==64730==    by 0x7395E5D: VecScatterSetUp_MPI1 (vpscat_mpi1.c:2543)
==64730==    by 0x73DDD39: VecScatterSetUp (vscatfce.c:212)
==64730==    by 0x73DCD73: VecScatterCreateWithData (vscreate.c:333)
==64730==    by 0x7444232: VecCreateGhostWithArray (pbvec.c:685)
==64730==    by 0x744490D: VecCreateGhost (pbvec.c:741)

==133582== Conditional jump or move depends on uninitialised value(s)
==133582==    at 0x4030384: memcpy@@GLIBC_2.14 (vg_replace_strmem.c:1034)
==133582==    by 0x739E4F9: PetscMemcpy (petscsys.h:1649)
==133582==    by 0x739E4F9: VecScatterMemcpyPlanExecute_Pack
(vecscatterimpl.h:150)
==133582==    by 0x739E4F9: VecScatterBeginMPI1_1 (vpscat_mpi1.h:69)
==133582==    by 0x73DD964: VecScatterBegin (vscatfce.c:110)
==133582==    by 0x744E195: VecGhostUpdateBegin (commonmpvec.c:225)

This is from a Git checkout of PETSc... the hash I branched from is:
0e667e8fea4aa from December 23rd (updating would be really hard at this
point as I've completed 90% of my dissertation with this version... and
changing PETSc now would be pretty painful!).

Any ideas?  Is it possible it's in my code?  Is it possible that there are
later PETSc commits that already fix this?

Thanks for any help,
Derek
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