[petsc-users] PETSC ERROR: Floating point exception!

[Roc Wang]

Hello,
  I met a wierd problem.  I am trying to solve linear system by calling KSPSolve().  But sometimes, the error information of Floating point exception!  I tried to track down the error, but unfortunately, it's pretty random.  Sometimes the executable runs fine. Other times it will crash with floating point exceptions as below.   I cannot find the exact line causing the error.  Could you please give me some suggestions or hints? Thanks a lot!
[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 7, Thu Mar 15 09:30:51 CDT 2012 
[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: /gpfs/home/pzw2/work/MLPIC03_3dCart_20121118/a.out on a arch-linu named lionxo64.hpc.aset.psu.edu by pzw2 Sat Nov 24 11:01:49 2012
[0]PETSC ERROR: Libraries linked from /usr/global/petsc/3.2-p7/lib
[0]PETSC ERROR: Configure run at Thu Apr  5 10:32:29 2012
[0]PETSC ERROR: Configure options --prefix=/usr/global/petsc/3.2-p7/ --with-blas-lapack-dir=/usr/global/intel/mkl/10.2.6.038/lib/em64t/
[0]PETSC ERROR: ------------------------------------------------------------------------
[0]PETSC ERROR: VecNorm() line 167 in src/vec/vec/interface/rvector.c
[0]PETSC ERROR: VecNormalize() line 261 in src/vec/vec/interface/rvector.c
[0]PETSC ERROR: GMREScycle() line 128 in src/ksp/ksp/impls/gmres/gmres.c
[0]PETSC ERROR: KSPSolve_GMRES() line 231 in src/ksp/ksp/impls/gmres/gmres.c
[0]PETSC ERROR: KSPSolve() line 423 in src/ksp/ksp/interface/itfunc.c

 		 	   		  
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