[petsc-users] Infinite or not-a-number generated in norm!

[Dominik Szczerba]

Hi,

I am getting the below error with fgmres. I was wondering how to start
debugging the problem. All the values in the matrix and rhs seem fine.
Any suggestions are very welcome.

Best regards,
Dominik

||b|| = 3.102831e-05
Starting KSPSolve...
  0 KSP Residual norm 2.071556923444e-05
[0]PETSC ERROR: --------------------- Error Message
------------------------------------
[0]PETSC ERROR: Floating point exception!
[0]PETSC ERROR: Infinite or not-a-number generated in norm!
[0]PETSC ERROR:
------------------------------------------------------------------------
[0]PETSC ERROR: Petsc Release Version 3.2.0, Patch 5, Sat Oct 29
13:45:54 CDT 2011
[0]PETSC ERROR: See docs/changes/index.html for recent updates.
[0]PETSC ERROR: See docs/faq.html for hints about trouble shooting.
[0]PETSC ERROR: See docs/index.html for manual pages.
[0]PETSC ERROR:
------------------------------------------------------------------------
[0]PETSC ERROR:
/home/dsz/build/framework-debug/sandbox/cscs/bin/FluidSolver on a
linux-gnu named tharsis by dsz Fri Dec 30 15:31:20 2011
[0]PETSC ERROR: Libraries linked from
/home/dsz/pack/petsc-3.2-p5/linux-gnu-c-debug/lib
[0]PETSC ERROR: Configure run at Wed Nov 23 13:57:33 2011
[0]PETSC ERROR: Configure options
PETSC_DIR=/home/dsz/pack/petsc-3.2-p5 PETSC_ARCH=linux-gnu-c-debug
--with-debugging=1 --with-x=0 --download-f-blas-lapack=1
--download-mpich=1 --download-hypre=1 --download-parmetis=1
--download-scalapack --download-blacs --download-mumps --with-hdf5
--with-hdf5-dir=/usr
[0]PETSC ERROR:
------------------------------------------------------------------------
[0]PETSC ERROR: VecNorm() line 167 in
/home/dsz/pack/petsc-3.2-p5/src/vec/vec/interface/rvector.c
[0]PETSC ERROR: FGMREScycle() line 132 in
/home/dsz/pack/petsc-3.2-p5/src/ksp/ksp/impls/gmres/fgmres/fgmres.c
[0]PETSC ERROR: KSPSolve_FGMRES() line 299 in
/home/dsz/pack/petsc-3.2-p5/src/ksp/ksp/impls/gmres/fgmres/fgmres.c
[0]PETSC ERROR: KSPSolve() line 423 in
/home/dsz/pack/petsc-3.2-p5/src/ksp/ksp/interface/itfunc.c
[0]PETSC ERROR: ApplyPreconditioner() line 3721 in
"unknowndirectory/"/home/dsz/src/framework/sandbox/dsz/cscs/solve/FluidSolver.cxx
[0]PETSC ERROR: PCApply_Shell() line 121 in
/home/dsz/pack/petsc-3.2-p5/src/ksp/pc/impls/shell/shellpc.c
[0]PETSC ERROR: PCApply() line 383 in
/home/dsz/pack/petsc-3.2-p5/src/ksp/pc/interface/precon.c
[0]PETSC ERROR: FGMREScycle() line 174 in
/home/dsz/pack/petsc-3.2-p5/src/ksp/ksp/impls/gmres/fgmres/fgmres.c
[0]PETSC ERROR: KSPSolve_FGMRES() line 299 in
/home/dsz/pack/petsc-3.2-p5/src/ksp/ksp/impls/gmres/fgmres/fgmres.c
[0]PETSC ERROR: KSPSolve() line 423 in
/home/dsz/pack/petsc-3.2-p5/src/ksp/ksp/interface/itfunc.c