hashcat Forum

I'm having a weird issue with the Unix MD5 hash type. After about two minutes of running, one GPU completely drops out, and the other that continues seems to not be processing correctly.

Also, when I attempt to quit using "q" after this happens, the process hangs and ultimately becomes zombied. I only seem to have an issue with this hash type, the others I've tested seem to work fine.

Thanks for the help in advance.

Code:
# /opt/oclHashcat-plus-0.09/oclHashcat-plus64.bin -m 500 -r ~/rules/generated.rule --remove --outfile test.cracked test.hash /var/passwords/wordlists/all_breaches.txt                                                                                         

oclHashcat-plus v0.09 by atom starting...

Hashes: 9 total, 9 unique salts, 9 unique digests

Bitmaps: 8 bits, 256 entries, 0x000000ff mask, 1024 bytes

Rules: 14729

Workload: 16 loops, 8 accel

Watchdog: Temperature abort trigger set to 90c

Watchdog: Temperature retain trigger set to 80c

Device #1: Cayman, 2048MB, 950Mhz, 24MCU

Device #2: Cayman, 2048MB, 950Mhz, 24MCU

Device #1: Kernel /opt/oclHashcat-plus-0.09/kernels/4098/m0500.Cayman_938.1_1.4.1741.kernel (2898852 bytes)

Device #2: Kernel /opt/oclHashcat-plus-0.09/kernels/4098/m0500.Cayman_938.1_1.4.1741.kernel (2898852 bytes)

Scanning dictionary /var/passwords/wordlists/all_breaches.txt: 1047576 bytes (0.59%), 102092 words, 150368361

Scanning dictionary /var/passwords/wordlists/all_breaches.txt: 61807285 bytes (35.03%), 6324145 words, 931483

Scanning dictionary /var/passwords/wordlists/all_breaches.txt: 136185486 bytes (77.19%), 13762913 words, 2027

Scanned dictionary /var/passwords/wordlists/all_breaches.txt: 176433682 bytes, 17781234 words, 261899766128 k

eyspace, starting attack...

[s]tatus [p]ause [r]esume [b]ypass [q]uit => s

Status.......: Running

Rules.Type...: File (/root/rules/generated.rule)

Input.Mode...: File (/var/passwords/wordlists/all_breaches.txt)

Hash.Target..: File (test.hash)

Hash.Type....: md5crypt, MD5(Unix), FreeBSD MD5, Cisco-IOS MD5

Time.Running.: 17 secs

Time.Left....: 9 days, 13 hours

Time.Util....: 17842.4ms/2036.1ms Real/CPU, 12.9% idle

Speed........:  2848.5k c/s Real,  3249.6k c/s GPU

Recovered....: 0/9 Digests, 0/9 Salts

Progress.....: 94114509/2357097895152 (0.00%)

Rejected.....: 43291341/94114509 (46.00%)

HWMon.GPU.#1.: 78% Util, 67c Temp, 30% Fan

HWMon.GPU.#2.: 78% Util, 65c Temp, 30% Fan

[s]tatus [p]ause [r]esume [b]ypass [q]uit => s

Status.......: Running

Rules.Type...: File (/root/rules/generated.rule)

Input.Mode...: File (/var/passwords/wordlists/all_breaches.txt)

Hash.Target..: File (test.hash)

Hash.Type....: md5crypt, MD5(Unix), FreeBSD MD5, Cisco-IOS MD5

Time.Running.: 1 min, 6 secs

Time.Left....: 9 days, 13 hours

Time.Util....: 66762.4ms/7571.9ms Real/CPU, 12.8% idle

Speed........:  2850.7k c/s Real,  3259.4k c/s GPU

Recovered....: 0/9 Digests, 0/9 Salts

Progress.....: 354287643/2357097895152 (0.02%)

Rejected.....: 163971099/354287643 (46.28%)

WMon.GPU.#1.: 75% Util, 77c Temp, 35% Fan

HWMon.GPU.#2.: 75% Util, 76c Temp, 33% Fan

[s]tatus [p]ause [r]esume [b]ypass [q]uit =>

Status.......: Running

Rules.Type...: File (/root/rules/generated.rule)

Input.Mode...: File (/var/passwords/wordlists/all_breaches.txt)

Hash.Target..: File (test.hash)

Hash.Type....: md5crypt, MD5(Unix), FreeBSD MD5, Cisco-IOS MD5

Time.Running.: 2 mins, 8 secs

Time.Left....: 11 days, 8 hours

Time.Util....: 128042.7ms/11064.5ms Real/CPU, 9.5% idle

Speed........:  2402.3k c/s Real,  3270.4k c/s GPU

Recovered....: 0/9 Digests, 0/9 Salts

Progress.....: 546749055/2357097895152 (0.02%)

Rejected.....: 239155839/546749055 (43.74%)

HWMon.GPU.#1.:  0% Util, 64c Temp, 57% Fan

HWMon.GPU.#2.: 99% Util, 77c Temp, 43% Fan

# ps aux | grep oclHashcat

root      1573 11.1  0.0      0     0 pts/1    Zl+  10:27   0:55 [oclHashcat-plus] <defunct>

sounds like a hardware defect

Downclock your cards a bit. Bad mhz/vcore voltage ratio or bad power supply.

my first guess would have been that the hashing algorithm you are trying to attack is highly iterated and as a result of that, excessive load on your GPUs might cause them to hang or drop out.

second possibility is of a driver issue, make sure you are running the latest release of ATI Catalyst.

Are you able to successfully run the attacks with other slow algorithms like Wordpress, PHPBB3, WPA/WPA2 and so on.

Try to decrease the values for --gpu-loop and --gpu-accel and see if that helps.

(10-14-2012, 07:34 PM)KT819GM Wrote: [ -> ]Downclock your cards a bit. Bad mhz/vcore voltage ratio or bad power supply.

I dropped my clocks to stock 850MHz and it looks like it's stable now. Thanks!

hm, cayman running at 950Mhz... classic asic hang caused by overclocking Smile

infinity432

undeath

KT819GM

NeonFlash

infinity432

epixoip