Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
Date:   Mon, 11 Jul 2022 13:17:24 +0530
From:   Viresh Kumar <viresh.kumar@linaro.org>
To:     Xuewen Yan <xuewen.yan94@gmail.com>
Cc:     Lukasz Luba <lukasz.luba@arm.com>,
        Xuewen Yan <xuewen.yan@unisoc.com>, rafael@kernel.org,
        mingo@redhat.com, peterz@infradead.org, juri.lelli@redhat.com,
        vincent.guittot@linaro.org, dietmar.eggemann@arm.com,
        rostedt@goodmis.org, bsegall@google.com, mgorman@suse.de,
        bristot@redhat.com, linux-kernel@vger.kernel.org,
        ke.wang@unisoc.com, xuewyan@foxmail.com, linux-pm@vger.kernel.org
Subject: Re: [PATCH] sched/schedutil: Fix deadlock between cpuset and cpu
 hotplug when using schedutil
Message-ID: <20220711074724.tbwefl42fpf2aq5a@vireshk-i7>
References: <20220705123705.764-1-xuewen.yan@unisoc.com>
 <CAB8ipk8w1=cMJV2_ZjWuX6T9RH9VXCMdUaZhLEkCziarhpy-5w@mail.gmail.com>
 <9ade9d43-3ed1-1239-f26e-73145856275a@arm.com>
 <CAB8ipk_Y5vaUMnRQVJsbHUue_J00qqy0E1ifu3W_hFSspL1r1w@mail.gmail.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <CAB8ipk_Y5vaUMnRQVJsbHUue_J00qqy0E1ifu3W_hFSspL1r1w@mail.gmail.com>
Precedence: bulk

On 11-07-22, 15:43, Xuewen Yan wrote:
> 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.

It would be better to reproduce this on mainline kernel, no android,
and tell us the steps. We don't want to chase an Android only issue,
just in case.

Thanks.

-- 
viresh