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