linux-kernel - Re: NOHZ tick-stop error: Non-RCU local softirq work is pending

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Message-ID: <20201210130458.GA150462@lothringen>
Date:   Thu, 10 Dec 2020 14:04:58 +0100
From:   Frederic Weisbecker <frederic@...nel.org>
To:     "Paul E. McKenney" <paulmck@...nel.org>
Cc:     linux-kernel@...r.kernel.org
Subject: Re: NOHZ tick-stop error: Non-RCU local softirq work is pending

On Wed, Nov 18, 2020 at 09:54:20AM -0800, Paul E. McKenney wrote:
> On Wed, Nov 18, 2020 at 09:52:18AM -0800, Paul E. McKenney wrote:
> > Hello, Frederic,
> > 
> > Here is the last few months' pile of warnings from rcutorture runs.
> 
> And this time with scenario names.  ;-)
> 
> 								Thanx, Paul
> 
> ------------------------------------------------------------------------
> 
> ./2020.11.02-12.05.02/TREE02/console.log:[  255.098527] NOHZ tick-stop error: Non-RCU local softirq work is pending, handler #282!!!
> ./2020.09.01-17.20.03/LOCK05.3/console.log:[  414.534548] NOHZ tick-stop error: Non-RCU local softirq work is pending, handler #80!!!
> ./2020.09.01-17.20.03/LOCK05.3/console.log:[ 3798.654736] NOHZ tick-stop error: Non-RCU local softirq work is pending, handler #80!!!
> ./2020.09.01-17.20.03/LOCK05.2/console.log:[ 1718.589367] NOHZ tick-stop error: Non-RCU local softirq work is pending, handler #80!!!
> ./2020.09.01-17.20.03/LOCK05.2/console.log:[ 6632.777655] NOHZ tick-stop error: Non-RCU local softirq work is pending, handler #80!!!
> ./2020.10.29-16.54.07/SRCU-P/console.log:[ 2873.688490] NOHZ tick-stop error: Non-RCU local softirq work is pending, handler #80!!!
> ./2020.11.02-17.25.58/TREE05/console.log:[ 3081.738937] NOHZ tick-stop error: Non-RCU local softirq work is pending, handler #80!!!
> ./2020.11.04-19.46.51/SRCU-N/console.log:[ 2673.597523] NOHZ tick-stop error: Non-RCU local softirq work is pending, handler #80!!!
> ./2020.09.02-17.17.02/LOCK05.3/console.log:[ 1467.372887] NOHZ tick-stop error: Non-RCU local softirq work is pending, handler #80!!!
> ./2020.09.02-17.17.02/LOCK05/console.log:[   34.371094] NOHZ tick-stop error: Non-RCU local softirq work is pending, handler #80!!!
> ./2020.09.02-17.17.02/LOCK05/console.log:[ 1147.260097] NOHZ tick-stop error: Non-RCU local softirq work is pending, handler #80!!!
> ./2020.11.14-16.00.39/SRCU-P/console.log:[ 5066.699589] NOHZ tick-stop error: Non-RCU local softirq work is pending, handler #80!!!
> ./2020.10.12-21.08.28/SRCU-P/console.log:[  816.338843] NOHZ tick-stop error: Non-RCU local softirq work is pending, handler #80!!!
> ./2020.09.02-15.27.04/LOCK05/console.log:[   34.338836] NOHZ tick-stop error: Non-RCU local softirq work is pending, handler #80!!!
> ./2020.09.10-02.28.14/TREE01/console.log:[ 1234.111394] NOHZ tick-stop error: Non-RCU local softirq work is pending, handler #280!!!
> ./2020.09.10-02.28.14/TREE01/console.log:[ 1282.109415] NOHZ tick-stop error: Non-RCU local softirq work is pending, handler #280!!!
> ./2020.09.10-02.28.14/TREE07/console.log:[  239.215890] NOHZ tick-stop error: Non-RCU local softirq work is pending, handler #280!!!
> ./2020.09.10-02.28.14/TREE07/console.log:[  367.918969] NOHZ tick-stop error: Non-RCU local softirq work is pending, handler #202!!!
> ./2020.09.10-02.28.14/TREE07/console.log:[ 1461.037894] NOHZ tick-stop error: Non-RCU local softirq work is pending, handler #80!!!
> ./2020.09.10-02.28.14/TREE07/console.log:[ 1503.810903] NOHZ tick-stop error: Non-RCU local softirq work is pending, handler #280!!!
> ./2020.09.10-02.28.14/TREE07/console.log:[ 1503.811939] NOHZ tick-stop error: Non-RCU local softirq work is pending, handler #280!!!
> ./2020.09.10-02.28.14/TRACE01/console.log:[  699.514824] NOHZ tick-stop error: Non-RCU local softirq work is pending, handler #202!!!
> ./2020.09.10-02.28.14/SRCU-P/console.log:[  751.681629] NOHZ tick-stop error: Non-RCU local softirq work is pending, handler #280!!!
> ./2020.09.10-02.28.14/TREE02/console.log:[  287.770126] NOHZ tick-stop error: Non-RCU local softirq work is pending, handler #202!!!
> ./2020.09.10-02.28.14/TREE02/console.log:[  287.771096] NOHZ tick-stop error: Non-RCU local softirq work is pending, handler #202!!!
> ./2020.09.10-02.28.14/TREE05/console.log:[  648.009370] NOHZ tick-stop error: Non-RCU local softirq work is pending, handler #80!!!
> ./2020.09.10-02.28.14/TREE05/console.log:[  924.733405] NOHZ tick-stop error: Non-RCU local softirq work is pending, handler #202!!!
> ./2020.09.10-02.28.14/TREE05/console.log:[  924.734011] NOHZ tick-stop error: Non-RCU local softirq work is pending, handler #202!!!
> ./2020.09.10-02.28.14/TREE05/console.log:[ 1743.197353] NOHZ tick-stop error: Non-RCU local softirq work is pending, handler #02!!!
> ./2020.09.10-02.28.14/TREE04/console.log:[ 1528.161635] NOHZ tick-stop error: Non-RCU local softirq work is pending, handler #280!!!
> ./2020.09.10-02.28.14/TREE04/console.log:[ 1528.162313] NOHZ tick-stop error: Non-RCU local softirq work is pending, handler #280!!!
> ./2020.10.30-11.47.17/TREE08/console.log:[  265.201513] NOHZ tick-stop error: Non-RCU local softirq work is pending, handler #280!!!
> ./2020.10.30-11.47.17/TREE08/console.log:[  473.137587] NOHZ tick-stop error: Non-RCU local softirq work is pending, handler #202!!!
> ./2020.11.05-11.47.22/TREE08/console.log:[  187.375426] NOHZ tick-stop error: Non-RCU local softirq work is pending, handler #280!!!
> ./2020.09.02-16.20.12/LOCK05/console.log:[ 1361.544451] NOHZ tick-stop error: Non-RCU local softirq work is pending, handler #80!!!
> ./2020.11.06-17.37.06/TREE05/console.log:[   79.519727] NOHZ tick-stop error: Non-RCU local softirq work is pending, handler #280!!!

I'm having a hard time reproducing this. After trying a batch of 10 TREE05, I'm
trying now with 10 SRCU-P, let's see how it goes.

Thanks.