Thanks for the answer, then I am sure that it is/was a bug. I continued by 
using the non-complex version of PETSC, after I do not need complex numbers 
here, and deal.II does not support complex values, either.

Am Montag, 2. Oktober 2017 16:24:44 UTC+2 schrieb Daniel Arndt:
>
> Maxi,
>
> I also see these kinds of problems with a recent developer version of 
> deal.II and https://github.com/dealii/dealii/pull/5178 provides a fix for 
> this issue.
> Most importantly, you are not doing anything wrong here. In the meantime, 
> you might just use PETSc with a non-complex scalar type, switch to a stable 
> version or apply 
> the fix in the PR mentioned.
>
> Best,
> Daniel
>

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