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Date: Sat, 24 Oct 2015 00:34:37 +0200
From: magnum <>
Subject: Re: Re: "Illegal instruction" error on

On 2015-10-24 00:09, magnum wrote:
> On 2015-10-23 22:00, Solar Designer wrote:
>> 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.
> I tried these on well:
> a) make -sj8 -f Makefile.legacy linux-x86-64-xop
> b) ./configure CFLAGS="-g -O2 -mxop" --disable-native-tests && make -sj8
> Regardless whether autoconf'ed or using legacy Makefile, Jumbo produces
> the "Sorry, XOP is required for this build". I also tried reverting to
> the very same version as Kali 4.0.0 seem to have used and this still
> works. But we've got reports from several places that it doesn't work
> for AVX (with Jumbo, at least).
> Could it be that the XOP check somehow works while the AVX one doesn't?
> I have no way to test that. Do we have a machine somewhere that lacks AVX?

Found the problem. When I supplied CFLAGS as above, the reciepe for 
john.o got them too but with a pure autoconf with nothing given, we did 
not supply any -mavx for that very target. The intentions were good but 
not the result: We did not get any CPU_DETECT from arch.h...

I will fix.


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