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Date: Fri, 23 Oct 2015 15:36:12 -0500
From: Eri Swager <>
Subject: Re: "Illegal instruction" error on

Thank you guys. No my CPU doesn't support AVX. I just now tried
john-1.7.9-jumbo-7-Linux-x86-64 and that worked.

On Fri, Oct 23, 2015 at 3:00 PM, Solar Designer <> wrote:

> 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.
> Alexander

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