Re: stalling IO regression since linux 5.12, through 5.18

Also please test the following one too:

diff --git a/block/blk-mq.c b/block/blk-mq.c
index 5ee62b95f3e5..d01c64be08e2 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c

@@ -1991,7 +1991,8 @@ bool blk_mq_dispatch_rq_list(struct blk_mq_hw_ctx 

*hctx, struct list_head *list,
 		if (!needs_restart ||
 		    (no_tag && list_empty_careful(&hctx->dispatch_wait.entry)))
 			blk_mq_run_hw_queue(hctx, true);
-		else if (needs_restart && needs_resource)
+		else if (needs_restart && (needs_resource ||
+					blk_mq_is_shared_tags(hctx->flags)))
 			blk_mq_delay_run_hw_queue(hctx, BLK_MQ_RESOURCE_DELAY);

 		blk_mq_update_dispatch_busy(hctx, true);