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

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Message-ID: <20200320130017.6457a1e8@canb.auug.org.au>
Date:   Fri, 20 Mar 2020 13:00:17 +1100
From:   Stephen Rothwell <sfr@...b.auug.org.au>
To:     Waiman Long <longman@...hat.com>
Cc:     Qian Cai <cai@....pw>, Thomas Gleixner <tglx@...utronix.de>,
        "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"

Hi all,

On Thu, 19 Mar 2020 15:00:35 -0400 Waiman Long <longman@...hat.com> wrote:
>
> 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.

I have reverted that commit from linux-next today.

-- 
Cheers,
Stephen Rothwell

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