|Message: Re: How to find out segmentation error in this case?||Not Logged In (login)|
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On Sat, 16 Dec 2006, long wrote: > *** Discussion title: Particles > Email replies to PublicHyperNews@slac.stanford.edu must include: > In-Reply-To: <"/particles/309"@geant4-hn.slac.stanford.edu> > Subject: ...change this to be about your reply. > > Hi,everyone. Could we discuss about how to debug our codes, especially for > segmentation error. Because I am a beginner. When I began to write my codes, I met > many problems,especially segmentation errors. I found it is hard for a freshman > to find out what happened? So I think this discussion will help all beginers like me. > Here is my concrete case, when I use geant4info particle, no error occured. > But when I use electron, segmentation error will happen. Then if I remove some codes on Visualization, > the error will disappear. By using GDB, I found the errors only come up at the end of main(), I mean, after delete > runManager,visManger... So I guess maybe the application try to free > some memory which had been freed or which don't belong to it. But where is the > problem? So could anybody give some general ideas on how to deal with these kind things? > Thank you very much! > Hello, Your analysis is correct - in your application at the end you delete some objects, which also are deleted by Geant4 kernel. One suggestion: Try to use gdb debugger: gdb myg4 > run mymacro > where "myg4" is your executable, "mymacro" is your macro-file, "run" and "where" are gdb commands. VI
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