linux-kernel - Re: [PATCH -v2] cgroup: fix deadlock caused by cgroup_mutex and cpu_hotplug

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Message-Id: <20240725110111.2063-1-hdanton@sina.com>
Date: Thu, 25 Jul 2024 19:01:11 +0800
From: Hillf Danton <hdanton@...a.com>
To: Chen Ridong <chenridong@...wei.com>
Cc: Roman Gushchin <roman.gushchin@...ux.dev>,
	tj@...nel.org,
	bpf@...r.kernel.org,
	cgroups@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH -v2] cgroup: fix deadlock caused by cgroup_mutex and cpu_hotplug_lock

On Thu, 25 Jul 2024 09:48:36 +0800 Chen Ridong <chenridong@...wei.com>
>
> did you mean to say this issue couldn't happen?
>
1) It is deadlock if watchdog work can not complete before any cgroup work.
2) It is not if you could not trigger it with no more than a dozen cgroup works.

Not important, boy, spin with deadlock erased.