Date: Wed, 3 Jun 2015 21:00:24 +0200 From: Luis Rocha <luiscrocha@...il.com> To: john-users@...ts.openwall.com Subject: Re: Multiple GPU and Fork > > > ... but you probably didn't have DISPLAY nor XAUTHORITY set to talk to > your X server from that root shell. (Maybe your bad habit of running > john as root has finally backfired.) You should be running john from a > user account and environment authorized to talk to your X server. As a > test, try running "xterm &" from the shell that you use to start john - > will it start, will it appear on your desktop? If so, exit the xterm > and then start john. If not, correct this first. > > I did try from a non-priv account "xterm &" and a it appeared on my desktop. I started JtR from there but same behavior. I exited and started JtR and the same behavior. I also have the DISPLAY variable and allowed X access with "xhost +" $ cat .bashrc | grep DISPLAY export DISPLAY=:0 $ xhost + access control disabled, clients can connect from any host Then I logged off and connected back using ssh and executed: $ sudo ./john 3-base.md5crypt.pw --format=md5crypt-opencl --dev=0,1 --fork=2 [sudo] password for user: initUnicode(UNICODE, ASCII/ASCII) ASCII -> ASCII -> ASCII Loaded 1726 password hashes with 1726 different salts (md5crypt-opencl, crypt(3) $1$ [MD5 OpenCL]) Node numbers 1-2 of 2 (fork) Device id 0 not working correctly, skipping. Device id 1 not working correctly, skipping. No OpenCL devices found Device 0: Hawaii [AMD Radeon R9 200 Series] Calculating best global worksize (GWS); max. 500ms single kernel invocation. Raw speed figures including buffer transfers: Had to run JtR with sudo because without sudo the opencl devices were not listed .. maybe I have somehow a broken installation of drivers and so on and so forth ... I am going to reinstall the OS and follow this guide https://hashcat.net/wiki/doku.php?id=linux_server_howto .. then if you someone is willing to help me debug this FORK issue I am all for it. On a different note, I got a Gygabyte R9 290x in case someone wants to perform some tests I am available to run those. Thank you for the help! Luis
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