Commercial BSIM4 model crashes gnucap

Hi,

I've been playing around a bit with CMOS transistor models. Using some
commercial BSIM4 models for NMOS and PMOS, I was surprisingly able to
get it to load in ngspice without much trouble at all. It even
simulated with reasonable results! When loading it in gnucap, I get a
number of warnings and then gnucap crashes.

Using the bsim465 model from gnucap-models [1], it seems like gnucap
understands all the model parameters in the model, but it still gets
some problems..

I get thousands of messages like this:
  parameter # not specified, using default
  parameter # not specified, using default
  ..
  ..

and some like this:
  parameter ad not specified, using default
  parameter ad value is "NOT_INPUT"
  ..

and then thousands of these:
  parameter # recursion too deep
  parameter # recursion too deep
  ...

At last, it crashes with:
  gnucap: /usr/include/gnucap/spice-wrapper.cc:1074: virtual void
DEV_SPICE::precalc_last(): Assertion `_maxEqNum == ckt()->CKTmaxEqNum'
failed.

Any ideas where I should start to debug? or if this is some kind of
known issue/expected behaviour?

Best regards
Ruben

[1] https://git.savannah.gnu.org/git/gnucap/gnucap-models.git