[PATCH blktests] nvme/069: add a test for multipath cdev lifetime

[Daniel Wagner]

On Tue, Jul 14, 2026 at 09:43:45AM +0000, John Garry wrote:
> +	# nvme-delay-ioctl will open the nvme-generic cdev, sleep, and then
> +	# issue an ioctl.
> +	# We tear down the nvme-subsystem in the foreground so we can catch
> +	# if the ioctl triggers a use-after-free KASAN warn.
> +	src/nvme-delay-ioctl "/dev/$nvmegeneric" &
> +	sleep 0.5
> +	_nvme_disconnect_ctrl "${nvmedev}"

The sleep above is to give nvme-delay-ioctl enough time to setup,
right? Would it possible for nvme-delay-ioctl issue some signal (or any
other working sync method) and we just wait for it to show up? IMO sleep
should be avoided if possible.