On Fri, 29 Oct 2021 19:39:26 +0900, Shin'ichiro Kawasaki wrote:
> Commit 0a593fbbc245 ("null_blk: poll queue support") introduced the poll
> queue feature to null_blk. After this change, null_blk device has both
> submit queues and poll queues, and null_map_queues() callback maps the
> both queues for corresponding hardware contexts. The commit also added
> the device configuration attribute 'poll_queues' in same manner as the
> existing attribute 'submit_queues'. These attributes allow to modify the
> numbers of queues. However, when the new values are stored to these
> attributes, the values are just handled only for the corresponding
> queue. When number of submit_queue is updated, number of poll_queue is
> not counted, or vice versa. This caused inconsistent number of queues
> and queue mapping and resulted in null-ptr-dereference. This failure was
> observed in blktests block/029 and block/030.
>
> [...]
Applied, thanks!
[1/1] null_blk: Fix handling of submit_queues and poll_queues attributes
commit: 15dfc662ef31a20b59097d59b0792b06770255fa
Best regards,
--
Jens Axboe
