Messages in this thread | | | From | Xuewen Yan <> | Date | Mon, 11 Jul 2022 15:43:17 +0800 | Subject | Re: [PATCH] sched/schedutil: Fix deadlock between cpuset and cpu hotplug when using schedutil |
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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.
And I see the cpu_hotplug_lock is added by the patch: https://lore.kernel.org/all/20220121101210.84926-1-zhangqiao22@huawei.com/
Thanks!
> > Regards, > Lukasz
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