[petsc-users] Meaning of PETSc error code 77

[Jed Brown]

Can you run in a debugger to get a stack trace?  I believe Dolfin
swallows the stack trace to obstruct efforts to remove bugs; probably
paid off by the bug lobby.

aditya kumar via petsc-users <petsc-users at mcs.anl.gov> writes:

> Hello,
>
> I am using PETSc with FEniCS project libraries to solve a nonlinear
> problem. I am using PETSc Krylov solver with the following configuration
>
> pc = PETScPreconditioner("petsc_amg")
> PETScOptions.set("mg_levels_ksp_type", "chebyshev")
> PETScOptions.set("mg_levels_pc_type", "jacobi")
> PETScOptions.set("mg_levels_esteig_ksp_type", "cg")
> PETScOptions.set("mg_levels_ksp_chebyshev_esteig_steps", 50) solver_u =
> PETScKrylovSolver("cg", pc)
>
> I am encountering this error sometimes during the solution of the linear
> system:
> Error: Unable to successfully call PETSc function 'KSPSolve'. *** Reason:
> PETSc error code is: 77 (Petsc has generated inconsistent data). *** Where:
> This error was encountered inside
> /tmp/dolfin/dolfin/la/PETScKrylovSolver.cpp.
>
> *** Process: 130
>
> Can anybody help me in understanding the possible reasons for this error
> code? Or refer me to any available documentation? It will be really
> helpful.
>
> Also, I will like to know if there is a way to prevent the code from
> stopping due to such PETSc errors, so that I can tweak some parameters to
> hopefully make it progress.
>
> Thanks and Regards,
> Aditya