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Date: Thu, 8 Sep 2016 08:42:38 +0200
To: "" <>
Subject: possible memory leak on FreeBSD?


I'm running JtR (JohnTheRipper-bleeding-jumbo 20160728) on FreeBSD 10.1-RELEASE, and I'm experiencing some nasty memory problem with some settings.
I'm cracking huge passwords dump (10s of millions records), and my current pot file is about 4.3 GB. The server has 16 GB ram (but also runs other softwares).

For example, --incremental will apparently very slowly consume memory on this server. I can't make really sure about this, but I can see the consumed swap size slowly increase overnight. Under normal usage, this server never swap a single bit.
It becomes blatant when I use --fork=4 with --incremental: the memory is exhausted in about 10-30 minutes and swap piles up. If I don't kill john, the box ends up crashing (swap exhaustion on ZFS is not good). Oddly, top output does not show a real increase in john's memory usage while free memory on host is depleting.
Same goes with --loopback --fork=4, even with a smaller pot file.

Other attack modes like --wordlist are OK.

I know nothing about debugging and memory leak tracking. Any clue appreciated.


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