linux-kernel - Re: Alleged fix for writer stall on -rcu branch dev

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Date:   Mon, 15 Apr 2019 12:40:47 +0200
From:   Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:     "Paul E. McKenney" <paulmck@...ux.ibm.com>
Cc:     linux-kernel@...r.kernel.org
Subject: Re: Alleged fix for writer stall on -rcu branch dev

On 2019-04-13 07:21:53 [-0700], Paul E. McKenney wrote:
> 
> And after ramping up the stress in rcutorture a bit, I am able to
> reproduce this CPU stall involving offlining on my systems.  My plan is
> my usual one:  Keep increasing rcutorture stress to get it to reproduce
> in reasonable time, add diagnostics as appropriate, and continue making
> forward-progress improvements in RCU itself.

I *think* this one is also new:

|Assertion failure in /home/bigeasy/linux-rt/tools/testing/selftests/rcutorture/res/2019.04.14-14:28:40/TREE03.37/console.log TREE03
|Summary: Warnings: 6 Call Traces: 6
https://breakpoint.cc/console-03.37.log

|Assertion failure in /home/bigeasy/linux-rt/tools/testing/selftests/rcutorture/res/2019.04.14-14:28:40/TREE03.39/console.log TREE03
|Summary: Warnings: 4 Call Traces: 4
https://breakpoint.cc/console-03.39.log

This is still commit 33e04e451279 ("torture: Allow inter-stutter interval to be
specified").

> Thank you very much for locating this one!!!

You are welcome.

> 							Thanx, Paul

Sebastian