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From:   Dexuan Cui <decui@microsoft.com>
To:     "paulmck@kernel.org" <paulmck@kernel.org>
CC:     Dexuan-Linux Cui <dexuan.linux@gmail.com>, Qian Cai <cai@lca.pw>,
        "Joel Fernandes (Google)" <joel@joelfernandes.org>,
        Tejun Heo <tj@kernel.org>,
        Josh Triplett <josh@joshtriplett.org>,
        Steven Rostedt <rostedt@goodmis.org>,
        "rcu@vger.kernel.org" <rcu@vger.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Lili Deng <Lili.Deng@microsoft.com>,
        Baihua Lu <Baihua.Lu@microsoft.com>
Subject: RE: "rcu: React to callback overload by aggressively seeking
 quiescent states" hangs on boot
Thread-Topic: "rcu: React to callback overload by aggressively seeking
 quiescent states" hangs on boot
Thread-Index: AQHVs4UjfkfCY1SyTUaF01bpD1XVcKe7qDEggAAFIwCAAAEtEA==
Date:   Sun, 15 Dec 2019 21:02:25 +0000
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> From: Paul E. McKenney <paulmck@kernel.org>
> Sent: Sunday, December 15, 2019 12:57 PM
> To: Dexuan Cui <decui@microsoft.com>
> Cc: Dexuan-Linux Cui <dexuan.linux@gmail.com>; Qian Cai <cai@lca.pw>; Joe=
l
> Fernandes (Google) <joel@joelfernandes.org>; Tejun Heo <tj@kernel.org>;
> Josh Triplett <josh@joshtriplett.org>; Steven Rostedt <rostedt@goodmis.or=
g>;
> rcu@vger.kernel.org; Linux Kernel Mailing List <linux-kernel@vger.kernel.=
org>;
> Lili Deng <Lili.Deng@microsoft.com>; Baihua Lu <Baihua.Lu@microsoft.com>
> Subject: Re: "rcu: React to callback overload by aggressively seeking qui=
escent
> states" hangs on boot
>=20
> On Sun, Dec 15, 2019 at 08:40:40PM +0000, Dexuan Cui wrote:
> > > From: Paul E. McKenney <paulmck@kernel.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@kernel.org>
> > Date:   Sun Dec 15 10:59:06 2019 -0800
> >
> >     squash! rcu: React to callback overload by aggressively seeking
> quiescent states
>=20
> Thank you!  May I add your Tested-by?
>=20
 							Thanx, Paul

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