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Date:   Sat, 11 May 2019 23:45:20 +0200
From:   Andrea Parri <>
To:     "Paul E. McKenney" <>
Cc:     Peter Zijlstra <>,
        Steven Rostedt <>,, Thomas Gleixner <>,
        Ingo Molnar <>,
        Juri Lelli <>,
        Morten Rasmussen <>,,
        Vincent Guittot <>,
        Sebastian Andrzej Siewior <>
Subject: Re: Question about sched_setaffinity()

> > The below trace explain the issue. Some Paul person did it, see below.
> > It's broken per construction :-)
> *facepalm*  Hence the very strange ->cpus_allowed mask.  I really
> should have figured that one out.
> The fix is straightforward.  I just added "rcutorture.shuffle_interval=0"
> to the TRIVIAL.boot file, which stops rcutorture from shuffling its
> kthreads around.

I added the option to the file and I didn't reproduce the issue.

> Please accept my apologies for the hassle, and thank you for tracking
> this down!!!

Peter (echoing Paul):  Thank you for pointing that shuffler out!


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