Dear GEANT4 developer:

The recursive_test command in /geometry/test/ causes a segmentation fault for a
very simple geometry.  The geometry consists of a single G4Tubs in a world
volume.  The G4Tubs is a quarter cylinder and defined as follows.

const G4double al_Rmin = 0.0*m;
const G4double al_Rmax = 1.0*m;
const G4double al_z = 0.3*m;
const G4double al_As = 0.0;
const G4double al_AD = 0.5*M_PI*rad;
const G4double y_pos = 0.0;

//create an object from a cylender
G4Tubs * alTubs = new G4Tubs("AlTubs",al_Rmin,al_Rmax,al_z,al_As,al_AD);

//the aluminum object's logical volume
G4LogicalVolume * alLV = new G4LogicalVolume(alTubs,Aluminum,"AlLV");

//place the object in the world
new G4PVPlacement(0, G4ThreeVector(0.0,y_pos,0.0), alLV,
AlPhys",experimentalHallLV,false,0);

Running recursive_test on this volume gives a segmentation fault.  However,
simply by changing y_pos to -1.0*mm, we avoide the segmentation fault.

A simple test program can be found at http://nucleus.usask.ca/~ward/misc/geotest.tgz

For the record:
Linux Kernel: 2.6.8
OS: Debian 3.1 (sarge)
gcc: 3.3.5
CLHEP: 1.9.2.0

Thank you for your time.

Ward