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Well, insane intermediate node voltages are coming

from somewhere and your debug can't proceed very

well, with that in place.

You might search around and see if gpdkXXX kits are

known for convergence problems (in the process

specific model cards) and if so any fixes / workarounds.

If you are getting blowup values from a handful of PDK

elements and nothing funny, that leans toward "bad kit".

But check that "nothing funny" supposition once more.

There will be a reason (or more) at the bottom of it all.

You could amuse yourself meanwhile by beating up

transistors, basic ID-VG and ID-VD curves taken over

more extreme ranges (including at least, reported values

from failed convergence) and see if you can identify an

unexpected, maybe nonphysical, result. Then you can

take that to whoever "owns" this kit, to tell you what is

going on.

You might want to make that connection now, maybe

this is known issue and a fresh kit could be had with

fewer problems. Because that's one thing about "contrib"

kits (especially ones which have no actual foundry to

tell them false from true) - you, the free lunch user, are

the free lunch front line QA resource. Have fun.