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SubjectRe: Alleged fix for writer stall on -rcu branch dev
On Mon, Apr 15, 2019 at 12:40:47PM +0200, Sebastian Andrzej Siewior wrote:
> 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

This is new in rcutorture as well. It is complaining that we just got
done with a stutter interval (in which torturing temporarily stops)
but not everything has progressed through the callback chain to be freed.
And in this case it is happening during rcutorture shutdown, so I need
to check the callback -- I might need end-of-run checks in that WARN_ON().

> |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

And the same here. So neither count against you. ;-)

Thanx, Paul

> 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
>

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