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Message-ID: <b9dd04cb-b669-4c97-9433-5e8aab4f3581@gmail.com>
Date: Wed, 7 May 2025 21:47:10 +0900
From: "SHINODA, Daisuke" <dskshnd@...il.com>
To: john-users@...ts.openwall.com
Subject: Re: sudden shutdown by overheat
Dear magnum,
I sincerely apologize for the delay in my response.
As you correctly pointed out, I suspected that the GPU fan speed might
be insufficient. Therefore, I installed the rocm-smi application and set
the GPU fan speed to 100%. As a result, JtR no longer shuts down.
However, the fan noise at 100% was extremely loud, so I reduced the
speed to 80%. Despite the noise still being quite loud, I noticed that
the system shuts down after approximately three hours at this setting.
Regarding the ADL (AMD Display Library) you mentioned, I extracted
libatiadlxx.so from an older AMD Radeon driver, added it to my Linux
system, and ran the ldconfig command. I then recompiled JtR, but
unfortunately, this resulted in no noticeable changes. After checking
the GPUOpen website, it seems that ADL and ADLX are now only available
for Windows, with no support for Linux. Even if libatiadlxx.so were
functional, it may only be retrieving the GPU Die-Edge temperature. The
temperature approaching 120°C is the GPU junction temperature, while the
GPU Die-Edge temperature does not exceed 80°C.
To address this issue, I created a bash script, which monitors the
rocm-smi output and temporarily pauses JtR if the GPU junction
temperature exceeds 115°C, resuming it when the temperature drops to
80°C. Using this script has successfully prevented shutdowns. I have
made this script available at the following URL:
https://github.com/dailikessushi/john_manager.sh/blob/main/john_manager.sh
It appears that recent AMD Radeon graphics cards can monitor
temperatures using applications like sensors or rocm-smi, both of which
can detect the GPU junction temperature. If the developers of JtR wish
to improve compatibility with modern AMD Radeon graphics cards, it may
be beneficial to utilize these applications.
Additionally, I tried hashcat as you suggested. While the benchmark ran
successfully, I encountered an error when attempting to use OpenCL with
the GPU for actual password cracking, rendering it unusable.
Thank you once again for your guidance. Please let me know if you have
any further suggestions.
Warm regards,
Dai
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