LArSoft

Specifying material reflectivity in LArPropertiesService triggers a GEANT4 initialisation error.
The error message is:

-------- EEEE ------- G4Exception-START -------- EEEE -------
*** G4Exception : Run0041
      issued by : G4UserRunAction::G4UserRunAction()
 You are instantiating G4UserRunAction BEFORE your G4VUserPhysicsList is
instantiated and assigned to G4RunManager.
 Such an instantiation is prohibited by Geant4 version 8.0. To fix this problem,
please make sure that your main() instantiates G4VUserPhysicsList AND
set it to G4RunManager before instantiating other user action classes
such as G4UserRunAction.
*** Fatal Exception *** core dump ***
 **** Track information is not available at this moment
 **** Step information is not available at this moment

-------- EEEE -------- G4Exception-END --------- EEEE -------

This problem may have been here since ages.
It can be reproduced for example in icaruscode v09_03_00 running with the following configuration:

#include "standard_g4_icarus.fcl" 

services.LArPropertiesService: {

  @table::services.LArPropertiesService

  ReflectiveSurfaceEnergies:     [ 1.77, 2.0675, 2.481, 2.819, 2.953, 3.1807, 3.54, 4.135, 4.962, 5.39, 7., 15. ]
  ReflectiveSurfaceNames:        [ "STEEL_STAINLESS_Fe7Cr2Ni", "copper", "G10", "vm2000", "ALUMINUM_Al" ]
  ReflectiveSurfaceReflectances: [
    [ 0.66, 0.64, 0.62, 0.60, 0.59, 0.57, 0.53, 0.47, 0.39, 0.36, 0.27, 0.25 ],         # STEEL_STAINLESS_Fe7Cr2Ni
    [ 0.902, 0.841, 0.464, 0.379, 0.345, 0.299, 0.287, 0.264, 0.337, 0.3, 0.0, 0.0 ],   # copper
    [ 0.393, 0.405, 0.404, 0.352, 0.323, 0.243, 0.127, 0.065, 0.068, 0.068, 0.0, 0.0 ], # "G10" 
    [ 0.93, 0.93, 0.93, 0.93, 0.93, 0.93, 0.1, 0.1, 0.7, 0.3, 0.0, 0.0 ],               # "vm2000" 
    [ 0.9, 0.9, 0.9, 0.9, 0.9, 0.9, 0.9, 0.47, 0.39, 0.36, 0.27, 0.25 ]                 # "ALUMINUM_Al" 
  ]
}

physics.simulate: [ largeant ]

A suitable input file was provided in Redmine issue #24890.

Steps to reproduce from a GPVM:

source /cvmfs/icarus.opensciencegrid.org/products/icarus/setup_icarus.sh
setup icaruscode v09_03_00 -q e19:prof
lar -c ./standard_g4_icarus_reflectivity.fcl prod_muon_0-1GeV_isotropic_icarus_20200831T231644_gen.root -n 1