Date: Sat, 20 Sep 2008 09:23:12 +0300 From: Giorgos Keramidas <keramida@ceid.upatras.gr> To: unga888@yahoo.com Cc: trashy_bumper@yahoo.com, freebsd-questions@freebsd.org Subject: Re: Segmentation fault when free Message-ID: <874p4bgwtr.fsf@kobe.laptop> In-Reply-To: <614097.81584.qm@web57007.mail.re3.yahoo.com> (Unga's message of "Fri, 19 Sep 2008 20:03:03 -0700 (PDT)") References: <614097.81584.qm@web57007.mail.re3.yahoo.com>
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On Fri, 19 Sep 2008 20:03:03 -0700 (PDT), Unga <unga888@yahoo.com> wrote: > Hi thank you very much for your reply and the test case. > > That is, in a trivial case like this, free() works well. Hopefully > free() works well in all cases too. > > But my main program is 1900 lines, f1() and f2() are in a 2200 lines > second file. The f1() and f2() calls some functions from a 500 lines > third file. The main program call another function, f3(), from 2nd > file, pass pointers to two functions f4(), f5() of main program. The > while loop iterate more than one million times. Its quite a complex > situation. You are probably calling free() multiple times for the same buffer. Try tracing the malloc and free calls, using the information from this message: http://lists.freebsd.org/pipermail/freebsd-questions/2008-July/179480.html > There must be an error somewhere else. I noted free() causes lot of > troubles. It is easy to write complex programs if you just let to leak > memory. But in my case, since the program iterate millions of times, > if I let to leak, I'm sure it will run out of RAM. Leaking memory is *never* a good choice. Especially if you are writing library code that others are supposed to use, or code that is supposed to run millions of times. While it's understandable as a 'quick hack' when you are first writing a program, I've seen far too many 'quick hacks' that lived years and years after the original 'experimental' period passed. Hence the knee-jerk reaction when I see leaks being used as a 'temporary' solution :)
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