[Iverilog-devel] iverilog indefinite hang with no growing memory

[Morgan M. <mcc...@gm...>]

Hi iVerilog devs,
I've run into an interesting bug with iverilog compiling a module with
unpacked-array instantiation of a module (not sure the correct naming for
this syntax).
When this occurs the CPU sits pegged at 100% but no memory growth and it
never terminates.
I've attached a self contained test program that exhibits the bug,
alternately commenting line 40 or 42 changes the result (one throws a
compiler error that I need an index, the other hangs)

I'm running on mac, installed with homebrew, revision info here:

icarus-verilog: stable 10.2 (bottled), HEAD
Verilog simulation and synthesis tool
http://iverilog.icarus.com/
/usr/local/Cellar/icarus-verilog/10.2_1 (59 files, 5.5MB) *
  Poured from bottle on 2018-08-08 at 10:09:06
From:
https://github.com/Homebrew/homebrew-core/blob/master/Formula/icarus-verilog.rb


Compilation arguments were simply:
iverilog -g2005-sv test_me.v

I've also attached a process sample while it's hung.

Please let me know if I can provide more information.

Thanks,
-Morgan