Messages in this thread | | | Subject | Re: [PATCH v4 11/19] sched/core: Make migrate disable and CPU hotplug cooperative | From | Qian Cai <> | Date | Wed, 02 Dec 2020 16:59:56 -0500 |
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On Mon, 2020-11-23 at 19:13 +0100, Sebastian Andrzej Siewior wrote: > On 2020-11-18 09:44:34 [-0500], Qian Cai wrote: > > 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. > > any update?
Just back from a vacation. I have been running the same workload on today's linux-next for a few hours and it has been good so far. I'll surely report back if it happens again in our daily runs.
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