linux-kernel - Re: Hard lockups due to "tick/common: Make tick

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Message-ID: <218eed57-27c8-12c0-6f5f-111874798c21@redhat.com>
Date:   Thu, 19 Mar 2020 15:00:35 -0400
From:   Waiman Long <longman@...hat.com>
To:     Qian Cai <cai@....pw>, Thomas Gleixner <tglx@...utronix.de>,
        Stephen Rothwell <sfr@...b.auug.org.au>
Cc:     "Joel Fernandes (Google)" <joel@...lfernandes.org>,
        "Paul E. McKenney" <paulmck@...nel.org>, rcu@...r.kernel.org,
        LKML <linux-kernel@...r.kernel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Will Deacon <will@...nel.org>, Ingo Molnar <mingo@...nel.org>,
        Frederic Weisbecker <fweisbec@...il.com>
Subject: Re: Hard lockups due to "tick/common: Make tick_periodic() check for
 missing ticks"

On 3/19/20 9:58 AM, Qian Cai wrote:
>
>> On Mar 6, 2020, at 10:33 PM, Qian Cai <cai@....pw> wrote:
>>
>>
>>
>>> On Mar 5, 2020, at 11:06 PM, Qian Cai <cai@....pw> wrote:
>>>
>> Using this config,
>>
>>> https://raw.githubusercontent.com/cailca/linux-mm/master/x86.config
>> Reverted the linux-next commit d441dceb5dce (“tick/common: Make tick_periodic() check for missing ticks”)
>> fixed the lockup that could easily happen during boot.
>
> Thomas or Stephen, can you back out this patch from linux-next while Waiman is getting to the bottom of it?
> I can still reproduce it as today.

I am fine for reverting the patch for now. I am still having some
trouble reproducing it and I have other tasks to work on right now. I
will get to the bottom of it and resubmit a new patch later on.

Cheers,
Longman