|Message: Re: SOLVED Irreproducible results||Not Logged In (login)|
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I have found the problem, and described it in http://bugzilla-geant4.kek.jp/show_bug.cgi?id=1718
The problem is comparison for equality between doubles. In my case, for the event I was debugging, they were exactly equal in sequential mode, but equal only to 14 significant digits in MPI mode.
I believe that the flakiness of this coding error can explain the curious symptoms I found. Moreover, fixing line 168 in G4WentzelOKandVIxSection.cc made the problem go away.
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