Re: [PATCH v4 11/19] sched/core: Make migrate disable and CPU hotplug cooperative

[Qian Cai]

On Tue, 2020-11-17 at 19:28 +0000, Valentin Schneider wrote:
> We did have some breakage in that area, but all the holes I was aware of
> have been plugged. What would help here is to see which tasks are still
> queued on that outgoing CPU, and their recent activity.
> 
> Something like
> - ftrace_dump_on_oops on your kernel cmdline
> - trace-cmd start -e 'sched:*'
>  <start the test here>
> 
> ought to do it. Then you can paste the (tail of the) ftrace dump.
> 
> I also had this laying around, which may or may not be of some help:

Once I have found a reliable reproducer, I'll report back.