I have not tried with the latest version yet. I found this problem in v3.7.7. 
I'll try that and let you know.
If the problem is still there, I'll send you an example.
Thanks for the help,

From: Smith, Barry F. <bsm...@mcs.anl.gov>
Sent: Friday, April 13, 2018 10:52:13 AM
To: Rossi, Simone
Cc: petsc-users@mcs.anl.gov
Subject: Re: [petsc-users] FIELDSPLIT preconditioner in parallel

1) Is this with the latest PETSc? some of these issues may have been fixed.

2) Please send use something that reproduces the problem and we will fix it. We 
aren't aware of this problem.


> On Apr 13, 2018, at 9:50 AM, Rossi, Simone <sro...@email.unc.edu> wrote:
> Hello,
> I'm trying to use PCFIELDSPLIT to solve a two by two block system and it is 
> working pretty nicely (thanks a lot for that!).
> I'm still having some issues in parallel though: the ksp solver throws an 
> error when one of the fields does not have DOFs  on a processor. Is there a 
> way  around it?
> Thanks a lot for the help,
> Simone

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