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

[Jed Brown]

On Fri, Dec 30, 2011 at 08:39, Dominik Szczerba <dominik at itis.ethz.ch>wrote:

> 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.
>

I suspect your custom preconditioner is computing NaN for the call to the
inner solver. Run with -fp_trap -start_in_debugger to see where NaN was
first generated.
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