linux-kernel - Re: [PATCH] workqueue: Remove incorrect "WARN_ON_ONCE(!list_empty(&worker->entry));" from dying worker

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Message-ID: <ZqwWwEtak1IC4Us6@slm.duckdns.org>
Date: Thu, 1 Aug 2024 13:14:08 -1000
From: Tejun Heo <tj@...nel.org>
To: Lai Jiangshan <jiangshanlai@...il.com>
Cc: linux-kernel@...r.kernel.org,
	Lai Jiangshan <jiangshan.ljs@...group.com>,
	Marc Hartmayer <mhartmay@...ux.ibm.com>
Subject: Re: [PATCH] workqueue: Remove incorrect
 "WARN_ON_ONCE(!list_empty(&worker->entry));" from dying worker

On Thu, Jul 25, 2024 at 09:04:37AM +0800, Lai Jiangshan wrote:
> From: Lai Jiangshan <jiangshan.ljs@...group.com>
> 
> The commit 68f83057b913 ("workqueue: Reap workers via kthread_stop()
> and remove detach_completion") changes the procedure of destroying
> workers; the dying workers are kept in the cull_list in wake_dying_workers()
> with the pool lock held and removed from the cull_list by the newly
> added reap_dying_workers() without the pool lock.
> 
> This can cause a warning if the dying worker is wokenup earlier than
> reaped as reported by Marc:

Applied to wq/for-6.11-fixes.

Thanks.

-- 
tejun