ublk: fix dead loop when canceling io command

ublk: fix dead loop when canceling io command

Commit:

f40139fde527 ("ublk: fix race between io_uring_cmd_complete_in_task and
		ublk_cancel_cmd")

adds a request state check in ublk_cancel_cmd(), and if the request is
started, skips canceling this uring_cmd.

However, the current uring_cmd may be in ACTIVE state, without block
request coming to the uring command. Meantime, if the cached request in
tag_set.tags[tag] has been delivered to ublk server and reycycled, then
this uring_cmd can't be canceled.

ublk requests are aborted in ublk char device release handler, which
depends on canceling all ACTIVE uring_cmd. So it causes a dead loop.

Fix this issue by not taking a stale request into account when canceling
uring_cmd in ublk_cancel_cmd().

Reported-by: Shinichiro Kawasaki <shinichiro.kawasaki@wdc.com>
Closes: https://lore.kernel.org/linux-block/mruqwpf4tqenkbtgezv5oxwq7ngyq24jzeyqy4ixzvivatbbxv@4oh2wzz4e6qn/
Fixes: f40139fde527 ("ublk: fix race between io_uring_cmd_complete_in_task and ublk_cancel_cmd")
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Link: https://lore.kernel.org/r/20250515162601.77346-1-ming.lei@redhat.com
[axboe: rewording of commit message]
Signed-off-by: Jens Axboe <axboe@kernel.dk>