On Wed, 2017-08-23 at 19:35 +0800, Ming Lei wrote: > soft lockup still can be observed easily with patch d4acf3650c7c( > block: Make blk_mq_delay_kick_requeue_list() rerun the queue at a quiet time), > but no hard lockup. Hello Ming, I never claimed that commit d4acf3650c7c was a full solution to avoid these soft lockups. I assume these results mean that patch series "[PATCH 0/7] Device mapper and dm-mpath fixes" was not applied to the kernel used in your tests? A colleague of you has reported that that patch series is sufficient to avoid these soft lockups. See also https://www.redhat.com/archives/dm-devel/2017-August/msg00122.html. Bart.
