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

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Message-ID: <20191215205656.GO2889@paulmck-ThinkPad-P72>
Date:   Sun, 15 Dec 2019 12:56:56 -0800
From:   "Paul E. McKenney" <paulmck@...nel.org>
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" <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