I get a segfault when I delete an instance of G4DormandPrinceRK78 compiled with GCC4.9 on SLC6, however not on mac with Clang 8.  If I look in the source code for G4DormandPrinceRK78.cc, fAuxStepper is uninitialised for the daughter instance of itself.  

There is the code:

if( primary )
    {
        fAuxStepper = new G4DormandPrinceRK78(EqRhs, numberOfVariables,
                                            !primary);
    }

If it's not the primary though, this is left uninitialised. The deletion of this is I believe the cause of the segfault.  It's definitely due to deleting this object and I use a variety of integrators without problem.  If I look in G4DormandPrinceRK56.cc, fAuxStepper is initialised to 0 (could be nullptr).  Similarly for G4DormandPrince745, it's initialised.  Even if I don't delete, Geant4 does and causes a problem at exit.

This is fixed in Geant4.10.0 but this version is unusable for me because the constructor for G4ExtrudedSolid is broken.

Please can this be fixed for the next patch of Geant4.10.3.p0X.

Many thanks,
Laurie