linux-kernel - Re: [PATCH] sched/schedutil: Fix deadlock between cpuset and cpu hotplug when using schedutil

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Mon, 11 Jul 2022 13:17:24 +0530
From:   Viresh Kumar <viresh.kumar@...aro.org>
To:     Xuewen Yan <xuewen.yan94@...il.com>
Cc:     Lukasz Luba <lukasz.luba@....com>,
        Xuewen Yan <xuewen.yan@...soc.com>, rafael@...nel.org,
        mingo@...hat.com, peterz@...radead.org, juri.lelli@...hat.com,
        vincent.guittot@...aro.org, dietmar.eggemann@....com,
        rostedt@...dmis.org, bsegall@...gle.com, mgorman@...e.de,
        bristot@...hat.com, linux-kernel@...r.kernel.org,
        ke.wang@...soc.com, xuewyan@...mail.com, linux-pm@...r.kernel.org
Subject: Re: [PATCH] sched/schedutil: Fix deadlock between cpuset and cpu
 hotplug when using schedutil

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