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Message-ID: <048701cc7880$18c236f0$4a46a4d0$@net>
Date: Wed, 21 Sep 2011 12:01:24 -0500
From: "jfoug" <jfoug@....net>
To: <john-dev@...ts.openwall.com>
Subject: RE: Crash bug on win32-cygwin-x86-any builds
>From: Solar Designer [mailto:solar@...nwall.com]
>
>For debugging, you need to remove -fomit-frame-pointer from CFLAGS and
>-s from LDFLAGS.
>
>Also, I think -fomit-frame-pointer is now the default on gcc 4.6.x on
>32-bit x86, so you may actually need to pass -fno-omit-frame-pointer if
>you use very recent gcc.
All is nice, but when I have -g and -fno-omit-frame-pointer added to CFLAGS,
it does not crash.
I hate chasing bugs like this.
So, if CFLAGS contain this:
-g -O2 -fno-omit-frame-pointer (works)
-g -O2 -fomit-frame-pointer (Crashes)
-g -fomit-frame-pointer (works, even if ONLY john.o was built this
way)
In all cases, LDFLAGS has -s removed, and "strip john.exe" is removed from
the bottom of Makefile. However, stripping or not stripping made no
difference in the crash or not crash.
The crash is in ldr_load_line, when looping through the fields. It is
almost like the db_options pointer points to invalid memory.
Jim.
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