Messages in this thread | | | Date | Mon, 11 Jul 2022 08:50:37 +0100 | Subject | Re: [PATCH] sched/schedutil: Fix deadlock between cpuset and cpu hotplug when using schedutil | From | Lukasz Luba <> |
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On 7/11/22 08:43, Xuewen Yan wrote: > On Mon, Jul 11, 2022 at 3:32 PM Lukasz Luba <lukasz.luba@arm.com> wrote: >> >> Hi Xuewen, >> >> On 7/11/22 08:21, Xuewen Yan wrote: >>> Hi all >>> >>> This deadlock is inevitable, any comment? >> >> Could you tell me how to reproduce this? >> Is there a need of special cgroup setup? > > This deadlock occurs when we run the monkey test on an Android phone, > at the same time, randomly put online or offline a cpu core. > Indeed the thread-A which get the cgroup_threadgroup_rwsem and waiting > for the cpu_hotplug_lock is the thread whose name is "OomAdjuster" in > android.
Thanks, let me have a look. We have some hotplug stress tests in our EAS mainline integration tests, which haven't triggered this issue. I'll try to trigger this on mainline kernel.
> > And I see the cpu_hotplug_lock is added by the patch: > https://lore.kernel.org/all/20220121101210.84926-1-zhangqiao22@huawei.com/
Thanks for the pointer.
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