linux-kernel - Re: Scenario TREE07 with CONFIG_PREEMPT

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Message-ID: <20220310225219.GE4285@paulmck-ThinkPad-P17-Gen-1>
Date:   Thu, 10 Mar 2022 14:52:19 -0800
From:   "Paul E. McKenney" <paulmck@...nel.org>
To:     Frederic Weisbecker <frederic@...nel.org>
Cc:     linux-kernel@...r.kernel.org
Subject: Re: Scenario TREE07 with CONFIG_PREEMPT_DYNAMIC=n?

On Thu, Mar 10, 2022 at 11:41:03PM +0100, Frederic Weisbecker wrote:
> On Thu, Mar 10, 2022 at 01:56:30PM -0800, Paul E. McKenney wrote:
> > Hello, Frederic,
> > 
> > I recently added CONFIG_PREEMPT_DYNAMIC=n to the TREE07 file, and since
> > then am getting roughly one RCU CPU stall warning (or silent hang)
> > per few tens of hours of rcutorture testing on dual-socket systems.
> > The stall warnings feature starvation of RCU grace-period kthread.
> > 
> > Any advice on debugging this?
> 
> Oh, I'm testing that!

Even better, thank you!  ;-)

							Thanx, Paul