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Date: Fri, 23 Oct 2015 23:00:48 +0300
From: Solar Designer <>
Subject: Re: "Illegal instruction" error on

On Fri, Oct 23, 2015 at 09:49:48PM +0200, magnum wrote:
> Just a guess: Your CPU doesn't have AVX support and whoever made that 
> Kali package should have produced an SSE2 binary, or provided fallback 
> binaries.

I doubt it's AVX in particular, because the core JtR tree checks for AVX
at runtime and fails gracefully if it's built for AVX but the system
(the CPU and/or the kernel) lacks AVX support.  Ditto for XOP (and even
for SSE2 in 32-bit builds).  Or have we broken that in jumbo, maybe
along with autoconf'ing it?  This is worth checking.

What jumbo certainly doesn't get "right" is checking for in-between
flavors (SSSE3, SSE4.1) and for AVX2 and AVX-512.  So maybe it's an
SSSE3 or SSE4.1 or AVX2 build failing on a CPU lacking these.

Whatever this is, magnum is right - a distro should provide multiple
binaries.  For some of the flavors that JtR is able to check for at
runtime, there's support for runtime fallbacks that a distro should use.
For jumbo-specific use of SSSE3, SSE4.1, AVX2, and AVX-512, there's
currently no such support, though.


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