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From: "hjl.tools at gmail dot com" <sourceware-bugzilla@sourceware.org>
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Subject: [Bug libc/27398] x86: Sporadic failures in tst-cpu-features-cpuinfo
Date: Fri, 12 Feb 2021 13:45:40 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D27398

--- Comment #4 from H.J. Lu <hjl.tools at gmail dot com> ---
(In reply to Siddhesh Poyarekar from comment #1)
> The failures become deterministic and numerous (18 failures in all) when =
the
> test is run under valgrind.  That may have something to do with valgrind's
> emulation but noting it here anyway since it seems relevant.  Importantly,
> valgrind does not report any errors.
>=20
> valgrind --trace-children=3Dyes ./testrun.sh elf/tst-cpu-features-cpuinfo
> --direct
>=20
> <valgrind output snipped since it does not report any errors>
>=20
> Checking HAS_CPU_FEATURE (ACPI):
>   HAS_CPU_FEATURE (ACPI): 1
>   cpuinfo (acpi): 1
> Checking HAS_CPU_FEATURE (ADX):
>   HAS_CPU_FEATURE (ADX): 0
>   cpuinfo (adx): 1
>  *** failure ***

This is because valgrind changes CPUID value:

https://stackoverflow.com/questions/48697579/valgrind-changes-cpuid-value

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