linux-kernel - Re: [RFC PATCH 0/2] workqueue: Fix hotplug races

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Date:   Tue, 30 Nov 2021 06:36:23 -1000
From:   Tejun Heo <tj@...nel.org>
To:     Frederic Weisbecker <frederic@...nel.org>
Cc:     Lai Jiangshan <jiangshanlai@...il.com>,
        LKML <linux-kernel@...r.kernel.org>,
        "Paul E . McKenney" <paulmck@...nel.org>
Subject: Re: [RFC PATCH 0/2] workqueue: Fix hotplug races

On Tue, Nov 30, 2021 at 01:06:10AM +0100, Frederic Weisbecker wrote:
> While triggering rcutorture splats, I couldn't trace down to the exact
> cause due to the issue being tracing-unfriendly. But looking at the code,
> those two potential races look like plausible causes and also after
> these two patches, I couldn't reproduce the rcutorture issues again (yet...).
> 
> Frederic Weisbecker (2):
>   workqueue: Fix unbind_workers() VS wq_worker_running() race
>   workqueue: Fix unbind_workers() VS wq_worker_sleeping() race

Both patches look good to me. Lai, thanks for finding the offending commits.
Frederic, can you please repost them w/ scheduler folks and tglx cc'd?

Thanks.

-- 
tejun