On 10/12/2016 08:20 AM, Vincent Guittot wrote: > On 8 October 2016 at 13:49, Mike Galbraith <efa...@gmx.de> wrote: >> On Sat, 2016-10-08 at 13:37 +0200, Vincent Guittot wrote: >>> On 8 October 2016 at 10:39, Ingo Molnar <mi...@kernel.org> wrote: >>>> * Peter Zijlstra <pet...@infradead.org> wrote: >>>> >>>>> On Fri, Oct 07, 2016 at 03:38:23PM -0400, Joseph Salisbury wrote: >>>>>> Hello Peter, >>>>>> >>>>>> A kernel bug report was opened against Ubuntu [0]. After a >>>>>> kernel >>>>>> bisect, it was found that reverting the following commit >>>>>> resolved this bug: >>>>>> >>>>>> commit 3d30544f02120b884bba2a9466c87dba980e3be5 >>>>>> Author: Peter Zijlstra <pet...@infradead.org> >>>>>> Date: Tue Jun 21 14:27:50 2016 +0200 >>>>>> >>>>>> sched/fair: Apply more PELT fixes >>> This patch only speeds up the update of task group load in order to >>> reflect the new load balance but It should not change the final value >>> and as a result the final behavior. I will try to reproduce it in my >>> target later today >> FWIW, I tried and failed w/wo autogroup on 4.8 and master. > Me too > > Is it possible to get some dump of /proc/sched_debug while the problem > occurs ? > > Vincent > >> -Mike
The output from /proc/shed_debug can be seen here: http://paste.ubuntu.com/23312351/ Ingo, the latest scheduler bits also still exhibit the bug: git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git
