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[2003:ea:8bcf:e300:dcf1:6934:a532:a875]) by smtp.googlemail.com with ESMTPSA id v12sm656600wmd.27.2018.12.24.13.11.12 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 24 Dec 2018 13:11:12 -0800 (PST) Subject: Re: Fix 80d20d35af1e ("nohz: Fix local_timer_softirq_pending()") may have revealed another problem From: Heiner Kallweit To: Frederic Weisbecker , Thomas Gleixner Cc: Anna-Maria Gleixner , Linux Kernel Mailing List , Grygorii Strashko References: <8b93f213-fe67-f132-f3f5-5b17995ec63d@gmail.com> <20180824041245.GA2730@lerouge> <67ce38dc-1f00-55c6-f9ae-2dec00172cf6@gmail.com> <20180824143056.GC2730@lerouge> <20180828022545.GA25943@lerouge> <20180928131855.GB8795@lerouge> Message-ID: <96aa7901-10a2-e0c3-d7d6-10e8b1a19354@gmail.com> Date: Mon, 24 Dec 2018 22:11:09 +0100 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:60.0) Gecko/20100101 Thunderbird/60.4.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 15.10.2018 22:58, Heiner Kallweit wrote: > 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 > Almost forgot about his topic, but the warning is still there. Has there been any progress in analysis?