linux-kernel - Re: sched: Unexpected reschedule of offline CPU#2!

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Message-ID: <87frervq1o.ffs@tglx>
Date: Sat, 19 Jul 2025 23:17:23 +0200
From: Thomas Gleixner <tglx@...utronix.de>
To: Phil Auld <pauld@...hat.com>
Cc: Jan Kiszka <jan.kiszka@...mens.com>, Henning Schild
 <henning.schild@...mens.com>, Peter Zijlstra <peterz@...radead.org>,
 x86@...nel.org, linux-kernel@...r.kernel.org, Ingo Molnar
 <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>, Guenter Roeck
 <linux@...ck-us.net>, xenomai@...omai.org, guocai.he.cn@...driver.com,
 pauld@...hat.com
Subject: Re: sched: Unexpected reschedule of offline CPU#2!

On Wed, Jul 09 2025 at 09:44, Phil Auld wrote:
> Hi Thomas,
>
> On Tue, Sep 03, 2024 at 05:27:58PM +0200 Thomas Gleixner wrote:
>> On Tue, Jul 27 2021 at 10:46, Jan Kiszka wrote:
>> 
>> Picking up this dead thread again.
>
> Necro-ing this again...
>
> I keep getting occasional reports of this case. Unfortunately
> though, I've never been able to reproduce it myself.
>
> Did the below patch ever go anywhere?

Nope. Guocai said it does not work and I have no reproducer either to
actually look at it deeper and there was further debug data provided.

> It seems to be stable in my testing with the addition of
> an "extern" in asm/cpu.h to get it to build.

I don't see why it wouldn't be stable, but as it does not seem to solve
the issue merging it as is does not make sense.

Thanks,

        tglx