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Message-ID: <CAN1C=SOPF=1Z2K-yXFdryABpAsE7LzufohxOtzzdt1wMAYoggA@mail.gmail.com>
Date: Wed, 24 Sep 2014 09:38:29 +1000
From: noir maru <noirmaru@...il.com>
To: john-users@...ts.openwall.com
Subject: Re: --dmg-opencl causes a segfault on my mac system with 4870...
must have been the bug. using the latest commit solved the issue. thanks
On Wed, Sep 24, 2014 at 3:59 AM, magnum <john.magnum@...hmail.com> wrote:
> On 2014-09-23 03:27, noir maru wrote:
>
>> I am having trouble to get things going with opencl. I am on 10.9.5 and
>> have built from the latest magnum jumbo bleeding edge.
>>
>
> crashs-Mac-Pro:run crashtest$ ./dmg2john /Volumes/system32/passwords.dmg
>> >
>> hash
>>
>> /Volumes/system32/passwords.dmg (DMG v1) successfully parsed, iterations
>> count 1000
>>
>> crashs-Mac-Pro:run crashtest$ ./john --format=dmg-opencl ./hash
>>
>> Device 1: Radeon HD 4870
>>
>> Segmentation fault: 11
>>
>> crashs-Mac-Pro:run crashtest$ ./john --test --format=dmg-opencl
>>
>> Device 1: Radeon HD 4870
>>
>> Segmentation fault: 11
>>
>
> First, grab the latest commit. A bug sneaked in 20h ago and a fix was just
> committed. It had nothing to do with this issue but it stopped some
> combinations of options, eg. using -test and -device at the same time. Then,
>
> 1. Try adding `LWS=64 GWS=512` before your command, as in
>
> $ LWS=64 GWS=512 ./john --format=dmg-opencl ./hash
>
> That will limit workgroup size so would be slower, but does it work?
>
> 2. Try `rm kernels/*.bin` (drop kernel cache) and immediately after that,
> try cracking (not testing) again. Any difference?
>
> 3. What if you use `--format=dmg` (the CPU version), does that work better?
>
> 4. What if you do use OpenCL but with `--device=CPU`, does that work?
>
> 5. What happens if you extract some test vectors like this and try them
> instead of your hash file:
>
> ../run/john --list=format-tests -form:dmg | grep -F '$1*' | cut
> -f3 > test.in
>
> Does that also crash?
>
>
> Hopefully some of the above will help us nail the problem.
>
> magnum
>
>
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