linux-kernel - Re: [PATCH -rc] workqueue: Reimplement UAF fix to avoid lockdep worning

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Message-ID: <ZloMv29mmAKNPTrg@slm.duckdns.org>
Date: Fri, 31 May 2024 07:45:35 -1000
From: Tejun Heo <tj@...nel.org>
To: Leon Romanovsky <leon@...nel.org>
Cc: Lai Jiangshan <jiangshanlai@...il.com>,
	Zqiang <qiang.zhang1211@...il.com>, linux-kernel@...r.kernel.org,
	Gal Pressman <gal@...dia.com>, Tariq Toukan <tariqt@...dia.com>,
	RDMA mailing list <linux-rdma@...r.kernel.org>
Subject: Re: [PATCH -rc] workqueue: Reimplement UAF fix to avoid lockdep
 worning

Hello,

On Fri, May 31, 2024 at 06:48:51AM +0300, Leon Romanovsky wrote:
> We have similar issues but with different workqueue.

So, the problem with the proposed patch is that pwq may still be in use by
then (due to async freeing) and thus can't be freed immediately. I still
don't understand why KASAN is triggering there. I tried to repro by
introducing a pwq alloc failure but couldn't. Can you please share the
repro?

Thanks.

-- 
tejun