On 26/04/2024 08:21, Joel Colledge wrote:
> If the worker thread is not woken due to a bio, then it is not woken at
> all. This causes the hung task check to trigger. For instance, when a
> delay of 0 is configured, delay_bio() returns without waking the worker,
> so this situation occurs.
>
> Prevent the hung task check from triggering by waking up the newly
> minted worker in delay_ctr().
>
> Fixes: 70bbeb29fab0 ("dm delay: for short delays, use kthread instead of timers and wq")
> Signed-off-by: Joel Colledge <joel.colledge@xxxxxxxxxx>
> ---
> drivers/md/dm-delay.c | 1 +
> 1 file changed, 1 insertion(+)
>
> diff --git a/drivers/md/dm-delay.c b/drivers/md/dm-delay.c
> index 5eabdb06c649..003512bb5fea 100644
> --- a/drivers/md/dm-delay.c
> +++ b/drivers/md/dm-delay.c
> @@ -274,6 +274,7 @@ static int delay_ctr(struct dm_target *ti, unsigned int argc, char **argv)
> dc->worker = NULL;
> goto bad;
> }
> + wake_up_process(dc->worker);
> } else {
> timer_setup(&dc->delay_timer, handle_delayed_timer, 0);
> INIT_WORK(&dc->flush_expired_bios, flush_expired_bios);
Is this an issue for delay > 0 too somehow?
Indeed if we don't have a delay the process will never be woken up,
but in that case, why create the worker in the first place?
You're missing lkml as recipient btw.
Kind Regards,
Christian
