linux-kernel - Re: [PATCH 5.15 000/567] 5.15.99-rc1 review

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Message-ID: <1fb2d6bb-914e-275e-91cd-9c1096355eb9@leemhuis.info>
Date:   Sun, 12 Mar 2023 14:57:53 +0100
From:   "Linux regression tracking (Thorsten Leemhuis)" 
        <regressions@...mhuis.info>
To:     Daniel Díaz <daniel.diaz@...aro.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org
Cc:     patches@...ts.linux.dev, linux-kernel@...r.kernel.org,
        torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
        linux@...ck-us.net, shuah@...nel.org, patches@...nelci.org,
        lkft-triage@...ts.linaro.org, pavel@...x.de, jonathanh@...dia.com,
        f.fainelli@...il.com, sudipm.mukherjee@...il.com,
        srw@...dewatkins.net, rwarsow@....de, peterz@...radead.org,
        jpoimboe@...hat.com, ray@...ax.com
Subject: Re: [PATCH 5.15 000/567] 5.15.99-rc1 review

On 08.03.23 07:24, Daniel Díaz wrote:
> 
> On 07/03/23 10:55, Greg Kroah-Hartman wrote:
>> This is the start of the stable review cycle for the 5.15.99 release.
>> There are 567 patches in this series, all will be posted as a response
>> to this one.  If anyone has any issues with these being applied, please
>> let me know.
>>
>> Responses should be made by Thu, 09 Mar 2023 16:57:34 +0000.
>> Anything received after that time might be too late.
>>
>> The whole patch series can be found in one patch at:
>>     https://www.kernel.org/pub/linux/kernel/v5.x/stable-review/patch-5.15.99-rc1.gz
>> or in the git tree and branch at:
>>     git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git linux-5.15.y
>> and the diffstat can be found below.
> 
> A new warning has been introduced on x86_64; we've seen it with GCC 8,
> 11, 12, and Clang 16.
> 
>   arch/x86/kernel/smp.o: warning: objtool: sysvec_reboot()+0x54:
> unreachable instruction
> 
> Bisection pointed towards "x86: Mark stop_this_cpu() __noreturn"
> (upstream commit f9cdf7ca57cada055f61ef6d0eb4db21c3f200db). Reverting
> this commit did remove the warning.
> 
> Reproducer:
> 
>   tuxmake \
>     --runtime podman \
>     --target-arch x86_64 \
>     --toolchain gcc-11 \
>     --kconfig
> https://storage.tuxsuite.com/public/linaro/lkft/builds/2MhGKYH63pYIllJIDAxH3FsvakK/config

FWIW, thee is another report about it here:
https://bugzilla.kernel.org/show_bug.cgi?id=217175
CCing the reporter

This is definitely not my area of expertise, so you might better want to
ignore the the following: I did some quick searching and now wonder if
backporting be0075951fde ("x86: Annotate call_on_stack()") might fix the
warning; it already was backported to 5.15 afaics:
https://lore.kernel.org/all/20220412062945.857488242@linuxfoundation.org/

Ciao, Thorsten