linux-kernel - Re: vmlinux.o: warning: objtool: do_machine_check()+0x5fa: call to memset() leaves .noinstr.text section

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Message-ID: <YffQ1XJ+9YAVa163@zn.tnic>
Date:   Mon, 31 Jan 2022 13:06:45 +0100
From:   Borislav Petkov <bp@...e.de>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     kernel test robot <lkp@...el.com>,
        "Paul E. McKenney" <paulmck@...nel.org>, kbuild-all@...ts.01.org,
        linux-kernel@...r.kernel.org
Subject: Re: vmlinux.o: warning: objtool: do_machine_check()+0x5fa: call to
 memset() leaves .noinstr.text section

On Wed, Jan 19, 2022 at 03:32:18PM -0800, Jakub Kicinski wrote:
> On Thu, 20 Jan 2022 00:17:23 +0100 Borislav Petkov wrote:
> > So, I'd like to reproduce that here and play with it a bit. What iso
> > can I install in a guest here so that I can get pretty close to your
> > environment?
> 
> It's CentOS Stream 8. It may have some extra backports done by my $corp
> but I don't think the compiler is backported.

Ok, while trying to boot an externally supplied kernel with qemu -kernel
and with a guest install of centos8, I managed to trigger the issues on
the test box.

I've pushed a branch here for you to test:

https://git.kernel.org/pub/scm/linux/kernel/git/bp/bp.git/log/?h=rc1%2bmce-noinstr

Lemme know how that goes.

Thx.

-- 
Regards/Gruss,
    Boris.

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