linux-kernel - Re: [PATCH 2/7] workqueue: Share the same PWQ for the CPUs of a pod

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Date: Wed, 3 Jan 2024 17:01:33 +0800
From: Lai Jiangshan <jiangshanlai@...il.com>
To: kernel test robot <oliver.sang@...el.com>
Cc: oe-lkp@...ts.linux.dev, lkp@...el.com, linux-kernel@...r.kernel.org, 
	Tejun Heo <tj@...nel.org>, Naohiro.Aota@....com, 
	Lai Jiangshan <jiangshan.ljs@...group.com>
Subject: Re: [PATCH 2/7] workqueue: Share the same PWQ for the CPUs of a pod

On Wed, Jan 3, 2024 at 10:55 AM kernel test robot <oliver.sang@...el.com> wrote:


Hello 0-DAY CI Kernel Test Team

> If you fix the issue in a separate patch/commit (i.e. not just a new version of
> the same patch/commit), kindly add following tags
> | Reported-by: kernel test robot <oliver.sang@...el.com>
> | Closes: https://lore.kernel.org/oe-lkp/202401031025.95761451-oliver.sang@intel.com
>
>
> [   30.471685][    T1] ------------[ cut here ]------------
> [ 30.476998][ T1] WARNING: CPU: 111 PID: 1 at kernel/workqueue.c:4842 destroy_workqueue (kernel/workqueue.c:4842 (discriminator 1))

It hits the check here

        if ((pwq != pwq->wq->dfl_pwq) && (pwq->refcnt > 1))
                return true;

Not only is the default pwq installed multiple times, but also other pwqs
with this patch.

Maybe pwq->installed_refcnt needs to be introduced to fix it.

Thanks
Lai