linux-kernel - Re: [PATCH] workqueue: Mark up unlocked access to wq->first

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Message-ID: <20200312182717.GF79873@mtj.duckdns.org>
Date:   Thu, 12 Mar 2020 14:27:17 -0400
From:   Tejun Heo <tj@...nel.org>
To:     Chris Wilson <chris@...is-wilson.co.uk>
Cc:     linux-kernel@...r.kernel.org,
        Lai Jiangshan <jiangshanlai@...il.com>
Subject: Re: [PATCH] workqueue: Mark up unlocked access to wq->first_flusher

On Tue, Mar 10, 2020 at 04:23:19PM +0000, Chris Wilson wrote:
> [ 7329.671518] BUG: KCSAN: data-race in flush_workqueue / flush_workqueue
> [ 7329.671549]
> [ 7329.671572] write to 0xffff8881f65fb250 of 8 bytes by task 37173 on cpu 2:
> [ 7329.671607]  flush_workqueue+0x3bc/0x9b0 (kernel/workqueue.c:2844)
> [ 7329.672527]
> [ 7329.672540] read to 0xffff8881f65fb250 of 8 bytes by task 37175 on cpu 0:
> [ 7329.672571]  flush_workqueue+0x28d/0x9b0 (kernel/workqueue.c:2835)
> 
> Signed-off-by: Chris Wilson <chris@...is-wilson.co.uk>
> Cc: Tejun Heo <tj@...nel.org>
> Cc: Lai Jiangshan <jiangshanlai@...il.com>

Applied to wq/for-5.7.

Thanks.

-- 
tejun