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Date: Sat, 5 May 2007 20:06:33 +0400
From: Solar Designer <>
Subject: Re:  Potfile size limitation?

On Sat, May 05, 2007 at 06:45:07AM +0000, -. -PhanTom-. - wrote:
> Me and 2 other people are experincing the same issue with "newer" JTR version
> is so far the last ver where this issue does not happen.

I assume, you mean 1.6.39?  Are you able to reproduce the problem with

> The issue is stack dump error when trying to do a -show with a potfile that is 
> more than aprox 459MB on disk.

That's quite a lot.  How much RAM and swap does your system have?  How
much does the "john" process use just before it crashes?

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

> Exception: STATUS_ACCESS_VIOLATION at eip=610C4914

Unfortunately, this is of little use to me.  The addresses given in this
dump are specific to your build of JtR - but you did not even mention
what version and build this error output corresponds to.  Also, I am not
using the Windows platform for any debugging (I imagine I'd have to for
a Windows-specific bug, though).  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).

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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