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Wed, 20 May 2026 00:49:23 -0700 (PDT) Date: Wed, 20 May 2026 15:49:16 +0800 From: Ming Lei To: Tetsuo Handa Cc: Bart Van Assche , Jens Axboe , Christoph Hellwig , Damien Le Moal , linux-block , LKML , Andrew Morton Subject: Re: [PATCH v2] loop: Fix NULL pointer dereference by synchronizing lo_release and loop_queue_rq Message-ID: References: <9b2032d6-3f36-4d2b-8128-985c08a4fa37@I-love.SAKURA.ne.jp> <20260518174013.4b72dd50a5bcb89daaed1f62@linux-foundation.org> <94076bc9-2c09-4bb6-8468-b6b8af419cb9@I-love.SAKURA.ne.jp> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <94076bc9-2c09-4bb6-8468-b6b8af419cb9@I-love.SAKURA.ne.jp> On Wed, May 20, 2026 at 03:36:12PM +0900, Tetsuo Handa wrote: > On 2026/05/20 12:06, Ming Lei wrote: > > The IO after close(loop) should be from writeback. rcu/sruc isn't necessary, > > Gemini's comment is that drain_workqueue() is not sufficient for waiting for > do_req_filebacked(REQ_OP_WRITE) requests with cmd->use_aio == true case to complete. Anything cleared in __loop_clr_fd() is not used by lo_rw_aio_complete() & lo_complete_rq(). So why isn't drain_workqueue() enough for cmd->use_aio? Thanks, Ming