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Re: Possible issue with commit 4961b6e11825?

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On Fri, Dec 04, 2015 at 03:20:22PM -0800, Paul E. McKenney wrote:
> Hello!
> 
> Are there any known issues with commit 4961b6e11825 (sched: core: Use
> hrtimer_start[_expires]())?
> 
> The reason that I ask is that I am about 90% sure that an rcutorture
> failure bisects to that commit.  I will be running more tests on
> 3497d206c4d9 (perf: core: Use hrtimer_start()), which is the predecessor
> of 4961b6e11825, and which, unlike 4961b6e11825, passes a 12-hour
> rcutorture test with scenario TREE03.  In contrast, 4961b6e11825 gets
> 131 RCU CPU stall warnings, 132 reports of one of RCU's grace-period
> kthreads being starved, and 525 reports of one of rcutorture's kthreads
> being starved.  Most of the test runs hang on shutdown, which is no
> surprise if an RCU CPU stall is happening at about that time.

I have no idea what the issue is but maybe you have the RCU stall backtrace
somewhere?
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Possible issue with commit 4961b6e11825? "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2015-12-05 00:20 +0100
  Re: Possible issue with commit 4961b6e11825? "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2015-12-05 20:10 +0100
    Re: Possible issue with commit 4961b6e11825? Viresh Kumar <viresh.kumar@linaro.org> - 2015-12-06 03:40 +0100
      Re: Possible issue with commit 4961b6e11825? "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2015-12-06 06:20 +0100
    Re: Possible issue with commit 4961b6e11825? "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2015-12-06 22:00 +0100
  Re: Possible issue with commit 4961b6e11825? Frederic Weisbecker <fweisbec@gmail.com> - 2015-12-07 20:10 +0100
    Re: Possible issue with commit 4961b6e11825? "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2015-12-07 21:10 +0100

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