linux-kernel - RE: "rcu: React to callback overload by aggressively seeking quiescent states" hangs on boot

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Message-ID: <PU1P153MB01557F1D44CCA23A8DA880F5BF560@PU1P153MB0155.APCP153.PROD.OUTLOOK.COM>
Date:   Sun, 15 Dec 2019 21:02:25 +0000
From:   Dexuan Cui <decui@...rosoft.com>
To:     "paulmck@...nel.org" <paulmck@...nel.org>
CC:     Dexuan-Linux Cui <dexuan.linux@...il.com>, Qian Cai <cai@....pw>,
        "Joel Fernandes (Google)" <joel@...lfernandes.org>,
        Tejun Heo <tj@...nel.org>,
        Josh Triplett <josh@...htriplett.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        "rcu@...r.kernel.org" <rcu@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Lili Deng <Lili.Deng@...rosoft.com>,
        Baihua Lu <Baihua.Lu@...rosoft.com>
Subject: RE: "rcu: React to callback overload by aggressively seeking
 quiescent states" hangs on boot

> From: Paul E. McKenney <paulmck@...nel.org>
> Sent: Sunday, December 15, 2019 12:57 PM
> To: Dexuan Cui <decui@...rosoft.com>
> Cc: Dexuan-Linux Cui <dexuan.linux@...il.com>; Qian Cai <cai@....pw>; Joel
> Fernandes (Google) <joel@...lfernandes.org>; Tejun Heo <tj@...nel.org>;
> Josh Triplett <josh@...htriplett.org>; Steven Rostedt <rostedt@...dmis.org>;
> rcu@...r.kernel.org; Linux Kernel Mailing List <linux-kernel@...r.kernel.org>;
> Lili Deng <Lili.Deng@...rosoft.com>; Baihua Lu <Baihua.Lu@...rosoft.com>
> Subject: Re: "rcu: React to callback overload by aggressively seeking quiescent
> states" hangs on boot
> 
> On Sun, Dec 15, 2019 at 08:40:40PM +0000, Dexuan Cui wrote:
> > > From: Paul E. McKenney <paulmck@...nel.org>
> > > Sent: Sunday, December 15, 2019 12:20 PM
> > >
> > > This is consistent with what I saw in Qian Cai's report, FYI.  So I
> > > am very interested in learning whether the first patch in my reply [1]
> > > helps you.
> > > 							Thanx, Paul
> >
> > Hi Paul, yes, your first patch (the below) can fix the hang issue:
> >
> > commit e8d6182b015bdd8221164477f4ab1c307bd2fbe9
> > Author: Paul E. McKenney <paulmck@...nel.org>
> > Date:   Sun Dec 15 10:59:06 2019 -0800
> >
> >     squash! rcu: React to callback overload by aggressively seeking
> quiescent states
> 
> Thank you!  May I add your Tested-by?
> 
 							Thanx, Paul

Tested-by: Dexuan Cui <decui@...rosoft.com>