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

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Date:   Sun, 15 Dec 2019 20:40:40 +0000
From:   Dexuan Cui <decui@...rosoft.com>
To:     "paulmck@...nel.org" <paulmck@...nel.org>,
        Dexuan-Linux Cui <dexuan.linux@...il.com>
CC:     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 12:20 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

Thanks,
-- Dexuan