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

[Dexuan Cui]

> From: Paul E. McKenney <paulmck@xxxxxxxxxx>
> Sent: Sunday, December 15, 2019 12:57 PM
> To: Dexuan Cui <decui@xxxxxxxxxxxxx>
> Cc: Dexuan-Linux Cui <dexuan.linux@xxxxxxxxx>; Qian Cai <cai@xxxxxx>; Joel
> Fernandes (Google) <joel@xxxxxxxxxxxxxxxxx>; Tejun Heo <tj@xxxxxxxxxx>;
> Josh Triplett <josh@xxxxxxxxxxxxxxxx>; Steven Rostedt <rostedt@xxxxxxxxxxx>;
> rcu@xxxxxxxxxxxxxxx; Linux Kernel Mailing List <linux-kernel@xxxxxxxxxxxxxxx>;
> Lili Deng <Lili.Deng@xxxxxxxxxxxxx>; Baihua Lu <Baihua.Lu@xxxxxxxxxxxxx>
> 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@xxxxxxxxxx>
> > > 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@xxxxxxxxxx>
> > 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@xxxxxxxxxxxxx>