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SubjectProblem with commit 31e77c93e432 "sched/fair: Update blocked load when newly idle"
Date
Recently I started to get the following problems with linux-next:

- When working via Putty/SSH on the system the console frequently freezes
for few seconds. Sometimes only opening a second console makes the
first one react again.

- I get "INFO: rcu_sched detected stalls on CPUs/tasks:" warnings as
described in [1].

Bisecting the issue resulted in:

31e77c93e432dec79c7d90b888bbfc3652592741 is the first bad commit
commit 31e77c93e432dec79c7d90b888bbfc3652592741
Author: Vincent Guittot <vincent.guittot@linaro.org>
Date: Wed Feb 14 16:26:46 2018 +0100

sched/fair: Update blocked load when newly idle

When NEWLY_IDLE load balance is not triggered, we might need to update the
blocked load anyway. We can kick an ilb so an idle CPU will take care of
updating blocked load or we can try to update them locally before entering
idle. In the latter case, we reuse part of the nohz_idle_balance.

After reversing this commit at least the issue with the freezing console
is gone. The second one appeared only sporadically, I still have to see
whether it pops up again.

System is a Zotac CI321 mini PC with Intel Celeron 2961Y CPU.
If you need more details, please let me know.

Regards, Heiner

[1] https://lkml.org/lkml/2018/3/22/605

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