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Date: Mon, 7 May 2007 13:08:45 +0400
From: Solar Designer <>
Subject: Re: Potfile size limitation?

I wrote:
> > Anyway, it is more likely that the problem is related to a specific
> > john.pot entry rather than to the file size.

On Mon, May 07, 2007 at 07:24:03AM +0000, -. -PhanTom-. - wrote:
> Is there anyway to trace what this entry might be then?

You can use the "usual" approach of splitting your john.pot file in
halves and seeing which half still causes the crash, then split that one
and so on.  You should be done in around 25 iterations.  If you ever
determine that neither half causes the crash or both do, then it's not
just one "problematic entry".  Either way, I'd be interested in your

> > I'd be of more help if you reproduce
> > the problem on a debugging build of JtR (add "-g" to both CFLAGS and
> > LDFLAGS, remove "-s" from LDFLAGS) while running under gdb, then type
> > "bt", "i r", "disass $pc-20 $pc+20" in gdb (and post the output of these
> > commands in here).
> I don't think I understand what it is you want me to do....?
> "while running under gdb"??

I suggested that you start a debugging build of John the Ripper under
the GNU debugger - gdb - which is a part of Cygwin (or you can do it on
non-Windows).  Maybe this is too complicated for you.

Alexander Peslyak <solar at>
GPG key ID: 5B341F15  fp: B3FB 63F4 D7A3 BCCC 6F6E  FC55 A2FC 027C 5B34 1F15 - bringing security into open computing environments

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