linux-kernel - Re: [PATCH 3/4] sched: WARN when migrating to an offline CPU

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Date:   Tue, 10 Oct 2017 01:18:34 +0000
From:   "Levin, Alexander (Sasha Levin)" <alexander.levin@...izon.com>
To:     Peter Zijlstra <peterz@...radead.org>
CC:     Sasha Levin <levinsasha928@...il.com>,
        Ingo Molnar <mingo@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        "linux-kernel@...r.kernel.org List" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/4] sched: WARN when migrating to an offline CPU

On Mon, Oct 09, 2017 at 10:04:45AM +0200, Peter Zijlstra wrote:
>On Sat, Oct 07, 2017 at 05:43:32PM +0000, Levin, Alexander (Sasha Levin) wrote:
>> On Sat, Oct 07, 2017 at 11:15:17AM +0200, Peter Zijlstra wrote:
>> >On Sat, Oct 07, 2017 at 02:07:26AM +0000, Levin, Alexander (Sasha Levin) wrote:
>> >> And quite a few lines of your added trace (lmk if you need more, or all):
>> >
>> >Yeah, could you please upload all of it somewhere? That chunk didn't
>> >include any hotplug bits at all.
>>
>> Attached. It's the stack trace followed by everything else.
>
>Much thanks, clue:
>
>[ 2073.495414] NOHZ: local_softirq_pending 202 -- (TIMER_SOFTIRQ | RCU_SOFTIRQ)
>
>cpuhp/2-22    [002] ....   104.797971: sched_cpu_deactivate: not-active: 2 mask: 0-1,3-4,6-7,9
>
>cpuhp/2-22    [002] ....   104.825166: sched_cpu_deactivate: rcu-sync: 2
>
>migration/2-24    [002] ..s1   104.855994: rebalance_domains: rcu-read-lock: 2
>migration/2-24    [002] ..s1   104.856000: load_balance: dst_cpu: 2 cpus: 6
>
>
>supposed fix; could you please verify?

Patch works, thanks!

-- 

Thanks,
Sasha