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Date: Mon, 26 Mar 2012 07:49:35 +0200
From: magnum <john.magnum@...hmail.com>
To: john-dev@...ts.openwall.com
Subject: Re: [JtR patch] Fast cracker for Mozilla Firefox, Thunderbird
 and SeaMonkey master passwords.

On 03/26/2012 05:01 AM, Dhiru Kholia wrote:
> On Mon, Mar 26, 2012 at 8:16 AM, Dhiru Kholia <dhiru.kholia@...il.com> wrote:
>> On Mon, Mar 26, 2012 at 3:47 AM, magnum <john.magnum@...hmail.com> wrote:
>>> I tried profiling without OMP (this will likely show the reason for poor
>>> scaling), but it segfaults. Did you try non-OMP after adding OMP
>>> support? I won't look further unless you say it's works fine for you.
>>
>> Strange, where does it segfault? It is working (both OMP and non-OMP) for me.
> 
> I can re-produce the segfault now using -O2 flag. It disappears under
> -ggdb flag.
> 
> Program terminated with signal 11, Segmentation fault.
> #0  0x00007fe99e5f5e25 in _IO_seekoff_unlocked (fp=0x1ed9b62,
> offset=8118, dir=<optimized out>, mode=<optimized out>) at
> ioseekoff.c:71
> 71	ioseekoff.c: No such file or directory.
> 	in ioseekoff.c
> (gdb) bt
> #0  0x00007fe99e5f5e25 in _IO_seekoff_unlocked (fp=0x1ed9b62,
> offset=8118, dir=<optimized out>, mode=<optimized out>) at
> ioseekoff.c:71
> #1  0x00007fe99e5f76ab in __GI_fseek (fp=0x1ed9b62, offset=<optimized
> out>, whence=<optimized out>) at fseek.c:41
> #2  0x0000000000463080 in CrackKeyData ()
> #3  0x0000000000462c73 in set_salt ()
> 
> Looking into it.


Sorry, I should have included the backtrace. I had a segfault with -g
but with -O2 and other stuff intact:

$ rm -f callgrind.out.* && valgrind --tool=callgrind ../run/john test.in
-wo:../run/password.lst -max=10
==23207== Callgrind, a call-graph generating cache profiler
==23207== Copyright (C) 2002-2010, and GNU GPL'd, by Josef Weidendorfer
et al.
==23207== Using Valgrind-3.6.1-Debian and LibVEX; rerun with -h for
copyright info
==23207== Command: ../run/john test.in -wo:../run/password.lst -max=10
==23207==
==23207== For interactive control, run 'callgrind_control -h'.
Loaded 1 password hash (Mozilla [32/64])
==23207==
==23207== Process terminating with default action of signal 11 (SIGSEGV)
==23207==  General Protection Fault
==23207==    at 0x60C12B0: fseek (fseek.c:40)
==23207==    by 0x4630BF: CrackKeyData (KeyDBCracker.c:144)
==23207==    by 0x462CB2: set_salt (mozilla_fmt.c:97)
==23207==    by 0x49F3A9: crk_init_salt (cracker.c:51)
==23207==    by 0x49F52C: crk_init (cracker.c:73)
==23207==    by 0x4B3F38: do_wordlist_crack (wordlist.c:580)
==23207==    by 0x4A4F0E: john_run (john.c:598)
==23207==    by 0x4A5358: main (john.c:768)
==23207==
==23207== Events    : Ir
==23207== Collected : 35879608
==23207==
==23207== I   refs:      35,879,608
Segmentation fault


Seems to be more or less the same place.

magnum

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