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Re: WARN_ON_ONCE() in process_one_work()?

From "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
Newsgroups linux.kernel
Subject Re: WARN_ON_ONCE() in process_one_work()?
Date 2017-06-14 17:20 +0200
Message-ID <tSifo-6QJ-37@gated-at.bofh.it> (permalink)
References (2 earlier) <tCoyu-4dM-17@gated-at.bofh.it> <tCoI9-4h9-7@gated-at.bofh.it> <tDP3A-4H2-3@gated-at.bofh.it> <tS14R-4hr-3@gated-at.bofh.it> <tS2DE-5lG-21@gated-at.bofh.it>
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On Tue, Jun 13, 2017 at 03:31:03PM -0700, Paul E. McKenney wrote:
> On Tue, Jun 13, 2017 at 04:58:37PM -0400, Tejun Heo wrote:
> > Hello, Paul.
> > 
> > On Fri, May 05, 2017 at 10:11:59AM -0700, Paul E. McKenney wrote:
> > > Just following up...  I have hit this bug a couple of times over the
> > > past few days.  Anything I can do to help?
> > 
> > My apologies for dropping the ball on this.  I've gone over the hot
> > plug code in workqueue several times but can't really find how this
> > would happen.  Can you please apply the following patch and see what
> > it says when the problem happens?
> 
> I have fired it up, thank you!
> 
> Last time I saw one failure in 21 hours of test runs, so I have kicked
> of 42 one-hour test runs.  Will see what happens tomorrow morning,
> Pacific Time.

And none of the 42 runs resulted in a workqueue splat.  I will try again
this evening, Pacific Time.

Who knows, maybe your diagnostic patch is the fix.  ;-)

							Thanx, Paul

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Thread

Re: WARN_ON_ONCE() in process_one_work()? Tejun Heo <tj@kernel.org> - 2017-06-13 23:00 +0200
  Re: WARN_ON_ONCE() in process_one_work()? "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-06-14 00:40 +0200
    Re: WARN_ON_ONCE() in process_one_work()? "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-06-14 17:20 +0200
      Re: WARN_ON_ONCE() in process_one_work()? "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-06-15 17:40 +0200
        Re: WARN_ON_ONCE() in process_one_work()? "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-06-16 19:40 +0200
          Re: WARN_ON_ONCE() in process_one_work()? Tejun Heo <tj@kernel.org> - 2017-06-17 14:00 +0200
            Re: WARN_ON_ONCE() in process_one_work()? "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-06-17 19:40 +0200
              Re: WARN_ON_ONCE() in process_one_work()? Tejun Heo <tj@kernel.org> - 2017-06-18 12:50 +0200

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