linux-kernel - Re: [PATCH stable 5.4,5.10] x86/fpu: Correct pkru/xstate inconsistency

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Date:   Tue, 15 Feb 2022 13:42:19 -0800
From:   Dave Hansen <dave.hansen@...el.com>
To:     Brian Geffon <bgeffon@...gle.com>,
        Greg KH <gregkh@...uxfoundation.org>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Willis Kung <williskung@...gle.com>,
        Guenter Roeck <groeck@...gle.com>,
        Borislav Petkov <bp@...e.de>,
        Andy Lutomirski <luto@...nel.org>,
        "# v4 . 10+" <stable@...r.kernel.org>,
        the arch/x86 maintainers <x86@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH stable 5.4,5.10] x86/fpu: Correct pkru/xstate
 inconsistency

On 2/15/22 13:32, Brian Geffon wrote:
>> How was this tested, and what do the maintainers of this subsystem
>> think?  And will you be around to fix the bugs in this when they are
>> found?
> This has been trivial to reproduce, I've used a small repro which I've
> put here: https://gist.github.com/bgaff/9f8cbfc8dd22e60f9492e4f0aff8f04f
> , I also was able to reproduce this using the protection_keys self
> tests on a 11th Gen Core i5-1135G7. 

I've got an i7-1165G7, but I'm not seeing any failures on a
5.11 distro kernel.

How long does this take for you to reproduce?