linux-kernel - Re: [syzbot] [block?] WARNING in dd_exit

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Message-ID: <20241126102535.GA16063@lst.de>
Date: Tue, 26 Nov 2024 11:25:35 +0100
From: Christoph Hellwig <hch@....de>
To: Bart Van Assche <bvanassche@....org>
Cc: syzbot <syzbot+f53c29806b4b263165f3@...kaller.appspotmail.com>,
	axboe@...nel.dk, linux-block@...r.kernel.org,
	linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com,
	Christoph Hellwig <hch@....de>, Damien Le Moal <dlemoal@...nel.org>,
	Ming Lei <ming.lei@...hat.com>
Subject: Re: [syzbot] [block?] WARNING in dd_exit_sched

On Mon, Nov 25, 2024 at 02:58:55PM -0800, Bart Van Assche wrote:
> All ongoing I/O requests should have completed before elevator_exit() is
> called. del_gendisk() calls __blk_freeze_queue_start() indirectly before
> it calls elevator_exit() but it doesn't wait for the queue freeze
> operation to complete. Isn't that a bug in del_gendisk()?

It does.  This should be fixed by:

https://lore.kernel.org/linux-block/20241126102136.619067-1-hch@lst.de/T/#u