Re: [Valgrind-developers] Unrecognised instruction request

[Ambalu, R. <Rob...@Po...>]

Understood, thanik you for the thorough explanation.  I'll pass along to the pyarrow maintainers

-----Original Message-----
From: John Reiser <jr...@bi...> 
Sent: Tuesday, November 23, 2021 6:09 PM
To: val...@li...
Subject: Re: [Valgrind-developers] Unrecognised instruction request

On 11/23/21 08:46, Ambalu, Robert wrote:
> 0x62 0xF1 0xFD 0x8 0x6F 0x44 0x24 0xA 0xC7 0x43

This is  vmovdqa64 0xa0(%rsp),%xmm0  which requires CPU feature flag
AVX512VL/AVX512F which is not supported by valgrind 3.18.1.

In the results of the emulated CPUID instruction, valgrind tells
the running application that AVX512 is not supported.
It is a bug in pyarrow ( python ) that its initialization routine
does not check the cpu feature flags, and switch its later run-time
instructions appropriately.  Please report this bug to the maintainers
of pyarrow.  Modern run-time libraries use the STT_GNU_IFUNC feature
to choose at run time which instruction set is available and may be used.
pyarrow (and/or python3 itself) must upgrade.

Gcc supports compile-time feature flags to avoid generating code
that uses certain instructions.  Run "info gcc" and search for "avx512",
paying attention to the flags beginning with "-mavx512", and in particular
the "-mno-avx512" variants.

Some software administration systems for installing and maintaining
software packages can limit the hardware features that packages
may assume.  You may be able to work-around valgrind's non-support
for AVX512 by telling the packaging system to avoid the package
variants which require AVX512.



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