linux-kernel - Re: Fix 80d20d35af1e ("nohz: Fix local_timer_softirq_pending()") may have revealed another problem

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Message-ID: <c472b6bf-e4af-d807-e63f-75211ce295bd@gmail.com>
Date:   Mon, 15 Oct 2018 22:58:54 +0200
From:   Heiner Kallweit <hkallweit1@...il.com>
To:     Frederic Weisbecker <frederic@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>
Cc:     Anna-Maria Gleixner <anna-maria@...utronix.de>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Grygorii Strashko <grygorii.strashko@...com>
Subject: Re: Fix 80d20d35af1e ("nohz: Fix local_timer_softirq_pending()") may
 have revealed another problem

On 28.09.2018 15:18, Frederic Weisbecker wrote:
> On Thu, Sep 27, 2018 at 06:05:46PM +0200, Thomas Gleixner wrote:
>> On Tue, 28 Aug 2018, Frederic Weisbecker wrote:
>>> On Fri, Aug 24, 2018 at 07:06:32PM +0200, Heiner Kallweit wrote:
>>>> I tested it and Frederic is right, it doesn't help. Can it be somehow related to
>>>> the cpu being brought down during suspend? Because I get the warning only during
>>>> suspend when the cpu is inactive already (but still online).
>>>
>>> It's hard to tell, I haven't been able to reproduce on suspend to disk/mem.
>>>
>>> Does this script eventually trigger it after some time?
>>
>> Any update to this?
> 
> Heiner? Can you please test the script I sent to you?
> 
> Thanks.
> 
Sorry, took some time .. And yes, running your script triggers the message too.

[   25.646015] x86: Booting SMP configuration:
[   25.646044] smpboot: Booting Node 0 Processor 1 APIC 0x2
[   25.664491] smpboot: CPU 1 is now offline
[   25.679299] x86: Booting SMP configuration:
[   25.679329] smpboot: Booting Node 0 Processor 1 APIC 0x2
[   25.698449] smpboot: CPU 1 is now offline
[   25.711698] x86: Booting SMP configuration:
[   25.711727] smpboot: Booting Node 0 Processor 1 APIC 0x2
[   25.729185] NOHZ: local_softirq_pending 202
[   25.729229] NOHZ: local_softirq_pending 202
[   25.730759] smpboot: CPU 1 is now offline
[   25.744053] x86: Booting SMP configuration:
[   25.744083] smpboot: Booting Node 0 Processor 1 APIC 0x2
[   25.762520] smpboot: CPU 1 is now offline
[   25.776834] x86: Booting SMP configuration:
[   25.776863] smpboot: Booting Node 0 Processor 1 APIC 0x2
[   25.794189] NOHZ: local_softirq_pending 202
[   25.796672] smpboot: CPU 1 is now offline
[   25.805970] x86: Booting SMP configuration:
[   25.805999] smpboot: Booting Node 0 Processor 1 APIC 0x2
[   25.827360] smpboot: CPU 1 is now offline
[   25.839043] x86: Booting SMP configuration:
[   25.839073] smpboot: Booting Node 0 Processor 1 APIC 0x2
[   25.858184] NOHZ: local_softirq_pending 202
[   25.862182] smpboot: CPU 1 is now offline
[   25.873759] x86: Booting SMP configuration:
[   25.873789] smpboot: Booting Node 0 Processor 1 APIC 0x2
[   25.893385] smpboot: CPU 1 is now offline