linux-kernel - Re: [syzbot] possible deadlock in worker

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Message-ID: <1b70929f-1f73-c549-64c1-94cea2c1a36c@acm.org>
Date:   Tue, 15 Feb 2022 09:05:38 -0800
From:   Bart Van Assche <bvanassche@....org>
To:     Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>,
        Haakon Bugge <haakon.bugge@...cle.com>
Cc:     Tejun Heo <tj@...nel.org>,
        syzbot <syzbot+831661966588c802aae9@...kaller.appspotmail.com>,
        Jason Gunthorpe <jgg@...pe.ca>,
        LKML <linux-kernel@...r.kernel.org>,
        OFED mailing list <linux-rdma@...r.kernel.org>,
        "syzkaller-bugs@...glegroups.com" <syzkaller-bugs@...glegroups.com>,
        Lai Jiangshan <jiangshanlai@...il.com>
Subject: Re: [syzbot] possible deadlock in worker_thread

On 2/15/22 04:48, Tetsuo Handa wrote:
> I do not want to do like
> 
> -	system_wq = alloc_workqueue("events", 0, 0);
> +	system_wq = alloc_workqueue("events", __WQ_SYSTEM_WIDE, 0);
> 
> because the intent of this change is to ask developers to create their own WQs.

I want more developers to use the system-wide workqueues since that 
reduces memory usage. That matters for embedded devices running Linux.

Thanks,

Bart.