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Message-ID: <Y4YWQcb4PMmIdzIM@infradead.org>
Date:   Tue, 29 Nov 2022 06:25:05 -0800
From:   Christoph Hellwig <hch@...radead.org>
To:     Li Nan <linan122@...wei.com>
Cc:     tj@...nel.org, josef@...icpanda.com, axboe@...nel.dk,
        cgroups@...r.kernel.org, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org, yukuai3@...wei.com,
        yi.zhang@...wei.com
Subject: Re: [PATCH -next 8/8] block: fix null-pointer dereference in
 ioc_pd_init

On Mon, Nov 28, 2022 at 11:44:34PM +0800, Li Nan wrote:
> Fix problem by moving rq_qos_exit() to disk_release().

No, that now means it is removed to later.  You need to add proper
synchronization.

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