Re: [syzbot] [block?] WARNING in dd_exit_sched

[Christoph Hellwig]

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@xxxxxx/T/#u