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Date: Fri, 27 Mar 2026 10:18:49 -1000
From: Tejun Heo <tj@kernel.org>
To: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: cgroups@vger.kernel.org, linux-kernel@vger.kernel.org,
	Bert Karwatzki <spasswolf@web.de>, Michal Koutny <mkoutny@suse.com>,
	Johannes Weiner <hannes@cmpxchg.org>,
	kernel test robot <oliver.sang@intel.com>
Subject: Re: [PATCH v3 cgroup/for-7.0-fixes] cgroup: Fix cgroup_drain_dying()
 testing the wrong condition
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References: <68d8881fd985a410c0f619f009334c28@kernel.org>
 <20260325180623.EcyNsp2L@linutronix.de>
 <acR3fYVD_blwD93_@slm.duckdns.org>
 <20260326073511.0rcA5AGb@linutronix.de>
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On Thu, Mar 26, 2026 at 08:35:11AM +0100, Sebastian Andrzej Siewior wrote:
> @@ -7141,7 +7143,7 @@ void cgroup_task_dead(struct task_struct *task)
>  {
>  	get_task_struct(task);
>  	llist_add(&task->cg_dead_lnode, this_cpu_ptr(&cgrp_dead_tasks));
> -	irq_work_queue(this_cpu_ptr(&cgrp_dead_tasks_iwork));
> +	schedule_delayed_work(this_cpu_ptr(&cgrp_delayed_tasks_iwork), HZ);

Can you try schedule_delayed_work_on(smp_processor_id(), ...)?
schedule_delayed_work() is using a percpu workqueue but the delay timer can
still migrate.

Thanks.

-- 
tejun