linux-kernel - [regression] some Dell systems hang at shutdown due to "x86/smp: Put CPUs into INIT on shutdown if possible" (was Fwd: Kernel 6.5 hangs on shutdown)

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Date:   Fri, 13 Oct 2023 14:05:29 +0200
From:   "Linux regression tracking (Thorsten Leemhuis)" 
        <regressions@...mhuis.info>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Yanjun Yang <yangyj.ee@...il.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux Regressions <regressions@...ts.linux.dev>,
        Bagas Sanjaya <bagasdotme@...il.com>,
        "Borislav Petkov (AMD)" <bp@...en8.de>,
        Ashok Raj <ashok.raj@...el.com>,
        Ingo Molnar <mingo@...hat.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        the arch/x86 maintainers <x86@...nel.org>
Subject: [regression] some Dell systems hang at shutdown due to "x86/smp: Put
 CPUs into INIT on shutdown if possible" (was Fwd: Kernel 6.5 hangs on
 shutdown)

[CCing x86 maintainers]

Hi Thomas!

On 12.10.23 11:37, Bagas Sanjaya wrote:
> 
> I notice a regression report on Bugzilla [1]. Quoting from it:
>>> I use Dell OptiPlex 7050, and kernel hangs when shutting down the
computer.
>> Similar symptom has been reported on some forums, and all of them are using
>> Dell computers:
>> https://bbs.archlinux.org/viewtopic.php?pid=2124429
>> https://www.reddit.com/r/openSUSE/comments/16qq99b/tumbleweed_shutdown_did_not_finish_completely/
>> https://forum.artixlinux.org/index.php/topic,5997.0.html

Another report: https://bugzilla.redhat.com/show_bug.cgi?id=2241279

>From all those links it seems quite a lot of users with Dell machines
are affected by this problem.

>> Tested with various kernel and this bug seems to be caused by commit: 88afbb21d4b36fee6acaa167641f9f0fc122f01b.

Thomas, turns out that bisection result was slightly wrong: a recheck
confirmed that the regression is actually caused by 45e34c8af58f23
("x86/smp: Put CPUs into INIT on shutdown if possible") [v6.5-rc1] of
yours. See https://bugzilla.kernel.org/show_bug.cgi?id=217995 for details.

Ciao, Thorsten

> Anyway, I'm adding this regression to be tracked by regzbot:
> [...]

#regzbot introduced: 45e34c8af58f
#regzbot link: https://bugzilla.redhat.com/show_bug.cgi?id=2241279