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

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Message-ID: <cae6517d-9580-424b-8d1d-c9bfcdffb73c@roeck-us.net>
Date: Sun, 20 Jul 2025 07:14:03 -0700
From: Guenter Roeck <linux@...ck-us.net>
To: Thomas Gleixner <tglx@...utronix.de>, 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>, xenomai@...omai.org,
 guocai.he.cn@...driver.com
Subject: Re: sched: Unexpected reschedule of offline CPU#2!

On 7/20/25 03:47, Thomas Gleixner wrote:
> On Sat, Jul 19 2025 at 23:17, Thomas Gleixner wrote:
>> 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.
> 
> Obviously:
> 
>          no further debug data was provided, so I can only tap in the
>          dark.
> 

FWIW, I have not seen this problem for a long time. I know it existed in
5.10, and I can find logs showing the problem in my company's bug system,
but only for 5.10 and older kernels. I don't see it in my test system either,
not even for 5.4.y or 5.10.y kernels.

Guenter