He's should submit a full bug report to petsc-ma...@mcs.anl.gov. 

   Barry

> On Sep 16, 2016, at 2:48 PM, Mark Adams <mfad...@lbl.gov> wrote:
> 
> Garth is getting a segv when he uses -pc_gamg_asm_use_agg and an overlap of 1.
> 
> This seems like a pretty hard thing to do right and I would not be surprised 
> if it was not done with complete generality. MatGetSubMatrix is find to get 
> any submatrix but enlarging a remote subdomain seems very tricky.
> 
> Should I perhaps check for overlap in GAMG and give an error? Maybe it would 
> be better to have ASM do this.  Maybe I could make ASM have a flag 
> am-i-nested and not allow overlap if not?
> 
> Mark

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