linux-kernel - Re: [x86/uaccess] 9c5743dff4: WARNING:at_arch/x86/mm/extable.c:#ex_handler

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Message-ID: <Yn6Rhv+VhZlVpOjt@zn.tnic>
Date:   Fri, 13 May 2022 19:12:38 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     kernel test robot <oliver.sang@...el.com>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        kernel test robot <oliver.sang@...el.com>,
        Eric Biggers <ebiggers@...gle.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        Sean Christopherson <sean.j.christopherson@...el.com>,
        Naresh Kamboju <naresh.kamboju@...aro.org>,
        LKML <linux-kernel@...r.kernel.org>, lkp@...ts.01.org,
        kernel test robot <lkp@...el.com>,
        the arch/x86 maintainers <x86@...nel.org>
Subject: Re: [x86/uaccess] 9c5743dff4:
 WARNING:at_arch/x86/mm/extable.c:#ex_handler_fprestore

On Fri, May 13, 2022 at 09:52:08AM -0700, Linus Torvalds wrote:
> On Fri, May 13, 2022 at 1:55 AM kernel test robot <oliver.sang@...el.com> wrote:
> >
> > FYI, we noticed the following commit (built with gcc-11): commit
> > 9c5743dff415 ("x86/uaccess: fix code generation in put_user()")
> > https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master

Err, is this seriously a report for a 5.9-something kernel?

[  266.828722][    T1] CPU: 0 PID: 1 Comm: init Not tainted 5.9.0-13419-g9c5743dff415 #1

> >
> > in testcase: boot
> >
> > on test machine: qemu-system-x86_64 -enable-kvm -cpu SandyBridge -smp 2 -m 16G
> >
> > caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace):

Can you reproduce the same with the latest Linus master or tip/master or
something current...?

Thx.

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette